Aruba JH103A Configuration Guide

HPE FlexFabric 12900E Switch Series

Segment Routing Configuration Guide

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Contents

Configuring SR-MPLS ··················································································· 1

About SR-MPLS ················································································································································· 1

SR-MPLS characteristics ··························································································································· 1

Basic concepts ··········································································································································· 1

How SR-MPLS works ································································································································· 1

Traffic steering to an SR-MPLS tunnel······································································································· 2

Static segment configuration ······················································································································ 3

Dynamic SID allocation through an IGP····································································································· 3

Dynamic SID allocation through BGP ········································································································ 4

SID allocation through BGP EPE ··············································································································· 4

Label forwarding entry installation based on SIDs ····················································································· 5

SRLSP setup ·············································································································································· 7

Packet forwarding in SR-MPLS ·················································································································· 7

MPLS SR and LDP interworking ······················································································································ 10

SR to LDP ················································································································································ 11

LDP to SR ················································································································································ 12

SR over LDP ············································································································································ 12

TI-LFA FRR ······················································································································································ 13

TI-LFA FRR advantages ·························································································································· 14

TI-LFA FRR concepts ······························································································································ 14

TI-LFA FRR path calculation ···················································································································· 14

TI-LFA FRR forwarding process ·············································································································· 15

Microloop avoidance after a network failure····························································································· 16

Microloop avoidance after a failure recovery ··························································································· 17

Protocols and standards ·································································································································· 17

SR-MPLS tasks at a glance ····························································································································· 18

IP traffic forwarding over SRLSPs tasks at a glance ················································································ 18

MPLS TE traffic forwarding over static SRLSPs tasks at a glance ·························································· 18

MPLS TE traffic forwarding over explicit paths tasks at a glance ···························································· 18

MPLS TE traffic forwarding over PCE-calculated SRLSPs tasks at a glance ·········································· 19

Configuring MPLS SRGBs ······························································································································· 19

Configuring the MPLS SRLB···························································································································· 20

Configuring static segments ····························································································································· 20

Prerequisites for configuring static segments ·························································································· 20

Configuring a static adjacency segment ·································································································· 20

Configuring a static prefix segment ·········································································································· 21

Configuring IGP-based SID advertisement ······································································································ 22

IGP-based SID advertisement tasks at a glance ····················································································· 22

Prerequisites for configuring IGP-based SID advertisement···································································· 23

Configuring the IGP to support SR-MPLS ································································································ 23

Configuring prefix SIDs ···························································································································· 24

Enabling SR-MPLS adjacency label allocation for the IGP ······································································ 24

Assigning adjacency SIDs ························································································································ 25

Enabling SR-MPLS adjacency SID allocation for aggregation group member interfaces························ 26

Assigning adjacency SIDs to aggregation group member interfaces······················································· 27

Enabling prefix SID conflict checking ······································································································· 27

Configuring BGP-based SID advertisement····································································································· 28

BGP-based SID advertisement tasks at a glance ···················································································· 28

Prerequisites for configuring BGP-based SID advertisement ·································································· 28

Configuring BGP to support MPLS SR ···································································································· 28

Configuring BGP prefix SIDs ···················································································································· 29

Configuring BGP EPE ······································································································································ 30

About BGP EPE ······································································································································· 30

Configuring BGP EPE-based SID allocation ···························································································· 30

Configuring a BGP EPE peer set ············································································································· 31

Configuring the SRLSP establishment triggering policy··················································································· 32

Configuring the device to prefer SRLSPs in traffic forwarding ········································································· 32

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Configuring an MPLS TE tunnel over a static SRLSP ····················································································· 33

Tasks at a glance ····································································································································· 33

Configuring a static SRLSP ······················································································································ 33

Binding a static SRLSP to an MPLS TE tunnel interface ········································································· 33

Configuring the static SRLSP switchback delay time··············································································· 34

Configuring an MPLS TE tunnel over an explicit-path SRLSP ········································································ 34

Tasks at a glance ····································································································································· 34

Prerequisites ············································································································································ 34

Configuring an explicit path for the MPLS TE tunnel ··············································································· 34

Configuring an MPLS TE tunnel over the explicit path············································································· 35

Configuring an MPLS TE tunnel over a PCE-calculated SRLSP ····································································· 35

Tasks at a glance ····································································································································· 35

Configuring an MPLS TE tunnel interface to use PCE to calculate the SRLSP······································· 36

Configuring IGP SR and LDP interworking ······································································································ 36

Restrictions and guidelines for IGP SR and LDP interworking ································································ 36

SR to LDP tasks at a glance ···················································································································· 36

LDP to SR tasks at a glance ···················································································································· 37

SR over LDP tasks at a glance ················································································································ 37

Prerequisites for SR-MPLS and LDP internetworking ·············································································· 37

Enabling advertisement of locally configured prefix-SID mappings ························································· 37

Configuring prefix-SID mappings ············································································································· 38

Enabling reception of advertised prefix-SID mappings ············································································ 38

Configuring TI-LFA FRR ·································································································································· 39

Restrictions and guidelines for TI-LFA FRR ····························································································· 39

TI-LFA FRR tasks at a glance ·················································································································· 39

Enabling TI-LFA FRR ······························································································································· 39

Disabling an interface from participating in TI-LFA calculation ································································ 40

Configuring microloop avoidance ············································································································· 41

Configuring SR OAM········································································································································ 43

Configuring BFD for SRLSPs ··················································································································· 43

Configuring SBFD for SRLSPs ················································································································ 44

Configuring tunnel BFD for all SRLSPs ··································································································· 45

Verifying and maintaining SR-MPLS ················································································································ 46

Displaying SR label block information ······································································································ 46

Displaying static segments ······················································································································· 46

Displaying BGP SR configuration and status information ········································································ 46

Displaying IS-IS SR configuration and status information········································································ 46

Displaying OSPF SR configuration and status information ······································································ 47

Displaying SRLSP configuration and status information ·········································································· 47

SR-MPLS configuration examples ··················································································································· 47

Example: Configuring SR-MPLS based on static segments ···································································· 47

Example: Configuring SR-MPLS based on ISIS-advertised SIDs···························································· 52

Example: Configuring SR-MPLS based on OSPF-advertised SIDs ························································· 58

Example: Configuring an SR-based MPLS TE tunnel over an explicit path············································· 63

Example: Configuring an MPLS TE tunnel over a PCE-calculated SRLSP ············································· 68

Example: Configuring SR-MPLS inter-AS option B ·················································································· 74

Example: Configuring SR-MPLS inter-AS option C (I) ············································································· 80

Example: Configuring SR-MPLS inter-AS option C (II) ············································································ 86

Example: Configuring SR-MPLS inter-AS option C (III) ··········································································· 93

Example: Configuring SR-MPLS to LDP (IS-IS) ···················································································· 101

Example: Configuring SR-MPLS to LDP (OSPF) ··················································································· 104

Example: Configuring SR-MPLS over LDP ···························································································· 106

Example: Configuring IS-IS TI-LFA FRR ······························································································· 111

Configuring SR-MPLS TE policies ····························································· 117

About SR-MPLS TE policies ·························································································································· 117

Basic concepts ······································································································································· 117

SR-MPLS TE policy creation ·················································································································· 118

SID list creation through dynamic path calculation ················································································ 118

SID list computation using PCE ············································································································· 119

SR-MPLS TE policy validity ··················································································································· 120

SR-MPLS TE policy routing procedure ·································································································· 120

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SR-MPLS TE policy forwarding procedure ···························································································· 121

Traffic steering to an SR-MPLS TE policy ······························································································ 122

SR-MPLS TE policy CBTS ····················································································································· 122

SR-MPLS TE policy association with BFD ····························································································· 124

SR-MPLS TE policy hot standby ············································································································ 126

MP-BGP extension for SR-MPLS TE policy-based routing ···································································· 126

SR-MPLS TE policy configuration tasks at a glance ······················································································ 127

Creating an SR-MPLS TE policy ···················································································································· 128

Manually creating an SR-MPLS TE policy and configuring its attributes ··············································· 128

Automatically creating SR-MPLS TE policies by using ODN ································································· 128

Configuring a PCEP session ·························································································································· 129

Restrictions and guidelines ···················································································································· 129

Discovering PCEs ·································································································································· 129

Enabling the SR capability for a PCC ···································································································· 130

Configuring PCEP session parameters ·································································································· 130

Configuring a candidate path and a SID list for the path················································································ 131

Restrictions and guidelines ···················································································································· 131

Configuring a candidate path to use manually configured SID lists ······················································· 131

Configuring a candidate path to create an SID list through affinity attribute-based path calculation ····· 132

Configuring a candidate path to create an SID list through Flex-Algo-based path calculation ·············· 133

Configuring a candidate path to use PCE-computed SID lists ······························································· 134

Configuring an ODN-created candidate path to create an SID list through affinity attribute-based path

calculation ·············································································································································· 135

Configuring an ODN-created candidate path to create an SID list through Flex-Algo-based path calculation

······························································································································································· 136

Configuring an ODN-created candidate path to use PCE-computed SID lists ······································· 136

Configuring PCE delegation to create candidate paths and SID lists ···················································· 137

Enabling strict SID encapsulation for SID lists ······························································································· 139

Configuring dynamic path calculation timers·································································································· 139

Enabling the device to distribute SR-MPLS TE policy path information to BGP-LS ······································ 140

Shutting down an SR-MPLS TE policy ·········································································································· 141

Configuring BGP to advertise BGP IPv4 SR policy routes············································································· 141

Restrictions and guidelines for BGP IPv4 SR policy route advertisement ············································· 141

Enabling BGP to advertise BGP IPv4 SR policy routes ········································································· 141

Configuring BGP to redistribute routes from the SR-MPLS TE policy ··················································· 142

Advertising BGP IPv4 SR policy routes to EBGP peers ········································································ 142

Filtering BGP IPv4 SR policy routes by router ID··················································································· 143

Configuring BGP to control BGP IPv4 SR policy route selection and advertisement ···························· 143

Maintaining BGP sessions ····················································································································· 144

Steering traffic to an SR-MPLS TE policy ······································································································ 145

Configuring color-based traffic steering ································································································· 145

Configuring tunnel policy-based traffic steering ····················································································· 146

Configuring DSCP-based traffic steering ······························································································· 147

Configuring static route-based traffic steering ························································································ 148

Configuring Flowspec rule-based traffic steering ··················································································· 149

Enabling SBFD for SR-MPLS TE policies ······································································································ 151

Configuring the BFD echo packet mode for SR-MPLS TE policies ······························································· 152

Enabling hot standby for SR-MPLS TE policies ····························································································· 154

Configuring path switchover and deletion delays for SR-MPLS TE policies ·················································· 155

Setting the delay time for bringing up SR-MPLS TE policies ········································································· 155

Configuring candidate path reoptimization for SR-MPLS TE policies ···························································· 156

Configuring SR-MPLS TE policy CBTS ········································································································· 157

Configuring traffic forwarding statistics for SR-MPLS TE policies·································································· 158

Enabling SR-MPLS TE policy logging ············································································································ 159

Verifying and maintaining SR-MPLS TE policies ··························································································· 159

Displaying BGP SR-MPLS TE policy routing information ······································································ 159

Verifying the SR-MPLS TE policy configuration and running status ······················································ 160

Displaying and clearing SR-TE forwarding information ·········································································· 160

Displaying SR-MPLS TE policy related information stored in the PCE ·················································· 160

SR-MPLS TE policy configuration examples ································································································· 161

Example: Configuring SR-MPLS TE policy-based forwarding ······························································· 161

iv

Configuring SRv6······················································································· 168

About SRv6 ···················································································································································· 168

Basic concepts ······································································································································· 168

SRv6 packet format ································································································································ 171

BGP-EPE ······················································································································································· 172

TI-LFA FRR ···················································································································································· 173

TI-LFA FRR background ························································································································ 173

TI-LFA FRR concepts ···························································································································· 174

TI-LFA FRR path calculation ·················································································································· 174

TI-LFA FRR forwarding process ············································································································ 175

SR microloop avoidance after a network failure ····················································································· 176

SR microloop avoidance after a failure recovery ··················································································· 177

Protocols and standards ························································································································ 178

SRv6 tasks at a glance ·································································································································· 178

Prerequisites for SRv6 ··································································································································· 179

Configuring SRv6 SIDs ·································································································································· 179

Setting the SRv6 SID flavor to NO-PSP ········································································································ 181

Setting the SRH encapsulation mode to normal encapsulation ····································································· 181

Configuring dynamic End.X SID deletion delay ····························································································· 182

Specifying a source address for the outer IPv6 header of SRv6-encapsulated packets ······························· 182

Using IGP to advertise SRv6 SIDs ················································································································ 183

Enabling BGP to advertise routes for a locator ······························································································ 184

Configuring BGP-EPE ···································································································································· 184

Enabling SRv6 BGP-EPE ······················································································································ 184

Applying a locator to BGP-EPE·············································································································· 185

Configuring a BGP-EPE SRv6 peer set ································································································· 186

Configuring traffic forwarding statistics collection for local SRv6 SIDs ·························································· 187

Configuring TI-LFA FRR ································································································································ 187

TI-LFA FRR tasks at a glance ················································································································ 187

Enabling TI-LFA FRR ····························································································································· 187

Disabling an interface from participating in TI-LFA calculation ······························································ 188

Configuring FRR microloop avoidance ·································································································· 189

Configuring SR microloop avoidance ····································································································· 190

Configuring the SRv6 MTU ···························································································································· 191

Configuring the SRv6 DiffServ mode ············································································································· 192

Verifying and maintaining SRv6 ····················································································································· 193

Displaying basic SRv6 configuration information ··················································································· 193

Displaying SRv6 BGP-EPE information ································································································· 193

Displaying IS-IS SRv6 information ········································································································· 193

Displaying OSPFv3 SRv6 information ··································································································· 194

Displaying and clearing traffic forwarding statistics for local SRv6 SIDs ··············································· 194

SRv6 configuration examples ························································································································ 195

Example: Configuring IPv6 IS-IS TI-LFA FRR ······················································································· 195

Configuring SRv6 TE policies ···································································· 200

About SRv6 TE policies ································································································································· 200

SRv6 TE policy identification ·················································································································· 200

SRv6 TE policy contents ························································································································ 200

SRv6 TE policy creation ························································································································· 201

SID list computation using PCE ············································································································· 201

SRv6 TE policy validity ··························································································································· 203

Traffic steering to an SRv6 TE policy ····································································································· 204

SRv6 TE policy path selection ··············································································································· 205

SRv6 TE policy forwarding procedure ···································································································· 205

BFD for SRv6 TE policy ························································································································· 206

SRv6 TE policy hot standby ··················································································································· 208

SRv6 TE policy transit node protection ·································································································· 208

SRv6 TE policy egress protection ·········································································································· 211

SRv6 TE policy tasks at a glance ·················································································································· 213

Creating an SRv6 TE policy ··························································································································· 214

Manually creating an SRv6 TE policy and configuring its attributes ······················································ 214

v

Automatically creating SRv6 TE policies by using ODN ········································································ 215

Configuring a PCEP session ·························································································································· 216

Restrictions and guidelines ···················································································································· 216

Discovering PCEs ·································································································································· 216

Enabling the SRv6 capability for a PCC································································································· 216

Configuring PCEP session parameters ·································································································· 217

Configuring a candidate path and the SID lists of the path ············································································ 218

Restrictions and guidelines ···················································································································· 218

Configuring a candidate path to use manually configured SID lists ······················································· 218

Configuring a candidate path to use PCE-computed SID lists ······························································· 219

Configuring PCE delegation to create candidate paths and SID lists ···················································· 220

Enabling the device to distribute SRv6 TE policy candidate path information to BGP-LS ····························· 221

Shutting down an SRv6 TE policy ·················································································································· 222

Configuring BGP to advertise BGP IPv6 SR policy routes············································································· 222

Restrictions and guidelines for BGP IPv6 SR policy routes advertisement ··········································· 222

Enabling BGP to advertise BGP IPv6 SR policy routes ········································································· 222

Configuring BGP to redistribute BGP IPv6 SR policy routes ································································· 223

Enabling advertising BGP IPv6 SR policy routes to EBGP peers ·························································· 223

Enabling Router ID filtering ···················································································································· 224

Configuring BGP to control BGP IPv6 SR policy route selection and advertisement ···························· 224

Maintaining BGP sessions ····················································································································· 226

Configuring SRv6 TE policy traffic steering···································································································· 226

Configuring the SRv6 TE policy traffic steering mode ············································································ 226

Configuring color-based traffic steering ································································································· 226

Configuring tunnel policy-based traffic steering ····················································································· 228

Configuring DSCP-based traffic steering ······························································································· 229

Configuring static route-based traffic steering ························································································ 231

Enabling automatic route advertisement for an SRv6 TE policy ···························································· 232

Configuring the SRv6 TE policy encapsulation mode ···················································································· 233

Enabling SBFD for SRv6 TE policies ············································································································· 234

Configuring the BFD echo packet mode for SRv6 TE policies ······································································ 236

Enabling hot standby for SRv6 TE policies ···································································································· 237

Configuring path switchover and deletion delays for SRv6 TE policies ························································· 238

Setting the delay time for bringing up SRv6 TE policies ················································································ 239

Configuring path connectivity verification for SRv6 TE policies ····································································· 240

Configuring SRv6 TE policy transit node protection······················································································· 241

Configuring SRv6 TE policy egress protection······························································································· 242

Restrictions and guidelines for SRv6 TE policy egress protection configuration ··································· 242

Configuring an End.M SID ····················································································································· 242

Enabling egress protection ····················································································································· 242

Configuring the deletion delay time for remote SRv6 SID mappings with VPN instances/public

instance/cross-connects/VSIs ················································································································ 243

Enabling the device to drop traffic when an SRv6 TE policy becomes invalid ··············································· 244

Enabling SRv6 TE policies to forward packets without using the last SID in the SID list ······························ 245

Specifying the packet encapsulation type preferred in optimal route selection ············································· 245

Configuring SRv6 TE policy resource usage alarm thresholds ······································································ 247

Enabling SRv6 TE policy logging ··················································································································· 247

Enabling SNMP notifications for SRv6 TE policies ························································································ 248

Configuring traffic forwarding statistics for SRv6 TE policies ········································································· 248

Verifying and maintaining SRv6 TE policies ·································································································· 249

Verifying the SRv6 TE policy operation status and configuration ·························································· 249

Verifying the SRv6 TE policy group operation status and configuration ················································ 250

Verifying the BGP IPv6 SR policy routing configuration········································································· 250

Verifying the SRv6 TE policy BFD and SBFD operation status ····························································· 250

Verifying the SRv6 TE policy egress protection configuration ······························································· 251

Displaying and clearing SRv6 TE policy forwarding statistics ································································ 251

Displaying SRv6 TE policy information in the PCE ················································································ 251

SRv6 TE policy configuration examples ········································································································ 251

Example: Configuring SRv6 TE policy-based forwarding ······································································ 251

Example: Configuring SRv6 TE policy egress protection······································································· 257

vi

SRv6 VPN overview ·················································································· 269

SRv6 VPN solutions ······································································································································· 269

IP L3VPN over SRv6 ······························································································································ 269

EVPN L3VPN over SRv6 ······················································································································· 269

EVPN VPWS over SRv6 ························································································································ 270

EVPN VPLS over SRv6 ························································································································· 270

Configuring IP L3VPN over SRv6 ······························································ 272

About IP L3VPN over SRv6 ··························································································································· 272

Basic principle ········································································································································ 272

Route advertisement ······························································································································ 272

Packet forwarding ·································································································································· 273

Intercommunication between SRv6 and EVPN VXLAN networks ························································· 273

IP L3VPN over SRv6 FRR ····················································································································· 275

IP L3VPN over SRv6 tasks at a glance·········································································································· 275

Configuring SRv6 SIDs ·································································································································· 276

Applying a locator to a BGP VPN instance ···································································································· 277

Configuring PEs to exchange BGP VPNv4 or VPNv6 routes ········································································ 278

Configuring IPv6 peers to exchange SRv6 SIDs ··························································································· 279

Configuring next hop-based dynamic End.DX4 or End.DX6 SID allocation for private network routes ········· 279

Configuring BGP VPNv4 or VPNv6 routes····································································································· 280

Restrictions and guidelines for BGP VPNv4 or VPNv6 route configuration ··········································· 280

Controlling BGP VPNv4 or VPNv6 route advertisement and reception ················································· 280

Setting a preferred value for received BGP VPNv4 or VPNv6 routes ···················································· 281

Configuring BGP VPNv4 or VPNv6 route reflection ··············································································· 281

Configuring BGP VPNv4 or VPNv6 route attributes··············································································· 282

Configuring BGP VPNv4 or VPNv6 route distribution filtering policies ·················································· 283

Configuring the BGP Additional Paths feature ······················································································· 284

Configuring BGP to preferentially use the routes learned from a peer or peer group ···························· 284

Configuring the route recursion mode ············································································································ 285

Specifying a source address for the outer IPv6 header of SRv6-encapsulated packets ······························· 286

Enabling SRv6 VPN compatibility for a peer or peer group ··········································································· 286

Enabling intercommunication between SRv6 and EVPN VXLAN networks ·················································· 287

About intercommunication between SRv6 and EVPN VXLAN networks ··············································· 287

Enabling BGP VPNv4 or VPNv6 route advertisement for the BGP EVPN address family ···················· 287

Enabling BGP EVPN route advertisement for the BGP VPNv4 or VPNv6 address family ···················· 288

Configuring IP L3VPN over SRv6 FRR ·········································································································· 288

Configuring SBFD for SRv6 locators ············································································································· 289

Configuring a TTL processing mode for tunnels associated with a VPN instance ········································· 290

Verifying and maintaining IP L3VPN over SRv6 ···························································································· 291

Displaying the configuration and running status of IP L3VPN over SRv6 VPN ····································· 291

Resetting BGP sessions ························································································································ 291

Clearing flap statistics for BGP VPNv4 routes ······················································································· 292

IP L3VPN over SRv6 configuration examples ······························································································· 292

Example: Configuring IP L3VPN over SRv6 in SRv6-BE mode····························································· 292

Configuring EVPN L3VPN over SRv6 ························································ 300

About EVPN L3VPN over SRv6 ····················································································································· 300

Basic principle ········································································································································ 300

Route advertisement ······························································································································ 300

Packet forwarding ·································································································································· 301

Intercommunication between SRv6 and EVPN VXLAN networks ································································· 302

Transit proxies for SRv6 SIDs in cross-AS EVPN L3VPN over SRv6 networks ············································ 303

EVPN L3VPN over SRv6 FRR ······················································································································· 305

EVPN L3VPN over SRv6 tasks at a glance ··································································································· 305

Configuring SRv6 SIDs ·································································································································· 306

Applying a locator to a BGP VPN instance ···································································································· 307

Configuring SRv6-encapsulated EVPN route advertisement ········································································· 308

Configuring PEs to exchange BGP EVPN routes ·························································································· 309

Configuring next hop-based dynamic End.DX4 or End.DX6 SID allocation for BGP routes ························· 309

Configuring BGP EVPN route settings ··········································································································· 310

vii

Restrictions and guidelines for BGP EVPN route configuration ····························································· 310

Configuring BGP route reflection ··········································································································· 310

Configuring attributes of BGP EVPN routes ··························································································· 311

Filtering BGP EVPN routes ···················································································································· 312

Configuring the BGP Additional Paths feature ······················································································· 312

Configuring the route recursion mode ············································································································ 313

Specifying a source address for the outer IPv6 header of SRv6-encapsulated EVPN L3VPN packets ········ 314

Enabling SRv6 VPN compatibility for a peer or peer group ··········································································· 314

Enabling intercommunication between SRv6 and EVPN VXLAN networks ·················································· 315

Configuring transit proxies for SRv6 SIDs in cross-AS EVPN L3VPN over SRv6 networks ·························· 315

Configuring EVPN L3VPN over SRv6 FRR ··································································································· 316

Configuring SBFD for SRv6 locators ············································································································· 317

Configuring a TTL processing mode for tunnels associated with a VPN instance ········································· 318

Verifying and maintaining EVPN L3VPN over SRv6 ······················································································ 319

Displaying the running status and configuration of EVPN L3VPN over SRv6 ······································· 319

Resetting BGP sessions ························································································································ 319

EVPN L3VPN over SRv6 configuration examples ························································································· 319

Example: Configuring IPv4 EVPN L3VPN over SRv6 in SRv6-BE mode ·············································· 319

Configuring public network IP over SRv6 ··················································· 327

About public network IP over SRv6 ··············································································································· 327

Basic principle ········································································································································ 327

Route advertisement ······························································································································ 327

Packet forwarding ·································································································································· 327

Public network IP over SRv6 FRR ········································································································· 329

Public network IP over SRv6 tasks at a glance······························································································ 329

Configuring SRv6 SIDs ·································································································································· 330

Applying a locator to a BGP instance············································································································· 331

Configuring PEs to exchange BGP IPv4 or IPv6 unicast routes ···································································· 331

Configuring IPv6 peers to exchange SRv6 SIDs ··························································································· 332

Configuring next hop-based dynamic End.DX4 or End.DX6 SID allocation for public network routes ·········· 333

Configuring the route recursion mode ············································································································ 333

Specifying a source address for the outer IPv6 header of SRv6-encapsulated packets ······························· 334

Configuring public network IP over SRv6 FRR ······························································································ 335

Configuring SBFD for SRv6 locators ············································································································· 336

Verifying and maintaining public network IP over SRv6················································································· 337

Displaying the configuration and running status of public network IP over SRv6 ·································· 337

Clearing flap statistics for BGP IPv6 unicast routes ··············································································· 337

Resetting BGP sessions ························································································································ 337

Public network IP over SRv6 configuration examples···················································································· 338

Example: Configuring public network IPv6 over SRv6 in SRv6-BE mode ············································· 338

Configuring SRv6 OAM ············································································· 343

About SRv6 OAM ··········································································································································· 343

SRv6 OAM protocol extensions ············································································································· 343

SRv6 SID-based ping ····························································································································· 344

SRv6 SID-based tracert ························································································································· 346

SRv6 TE policy-based ping ···················································································································· 348

SRv6 TE policy-based tracert ················································································································ 349

Restrictions and guidelines: SRv6 OAM configuration··················································································· 350

Performing an SRv6 SID-based ping operation ····························································································· 350

Performing an SRv6 SID-based tracert operation ························································································· 351

Performing an SRv6 TE policy-based ping operation ···················································································· 351

Performing an SRv6 TE policy-based tracert operation ················································································· 351

Specifying a remote End.OP SID locator ······································································································· 352

Configuring EVPN VPLS over SRv6 ·························································· 353

About EVPN VPLS over SRv6 ······················································································································· 353

Basic principle ········································································································································ 353

BGP EVPN route advertisement ············································································································ 353

Traffic forwarding ··································································································································· 353

EVPN VPLS over SRv6 multihoming ····································································································· 355

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EVPN VPLS over SRv6 tasks at a glance ····································································································· 356

Creating a VSI ················································································································································ 357

Configuring an EVPN instance ······················································································································ 357

About this task ········································································································································ 357

Restrictions and guidelines ···················································································································· 358

Creating an EVPN instance in system view and associating it with a VSI ············································· 358

Creating an EVPN instance in VSI view ································································································· 360

Configuring SRv6 SIDs ·································································································································· 361

Applying a locator to an EVPN instance ········································································································ 361

About this task ········································································································································ 361

Applying a locator to an EVPN instance in system view ········································································ 362

Applying a locator to an EVPN instance in VSI view·············································································· 362

Configuring unicast traffic forwarding based on End.DX2 and End.DX2L SIDs ············································ 362

Configuring the route recursion mode ············································································································ 363

About this task ········································································································································ 363

Prerequisites ·········································································································································· 363

Configuring the route recursion mode for an EVPN instance in system view ········································ 363

Configuring the route recursion mode for an EVPN instance in VSI view ·············································· 364

Configuring SRv6 TE policy traffic steering···································································································· 364

Restrictions and guidelines for SRv6 TE policy traffic steering ······························································ 364

Configuring color-based traffic steering ································································································· 364

Configuring tunnel policy-based traffic steering ····················································································· 366

Mapping ACs to a VSI ···································································································································· 367

Mapping a Layer 3 interface to a VSI ····································································································· 367

Mapping an Ethernet service instance to a VSI ····················································································· 367

Configuring PEs to exchange BGP EVPN routes ·························································································· 368

Specifying a source address for the outer IPv6 header of SRv6-encapsulated EVPN VPLS packets ·········· 369

Configuring EVPN VPLS over SRv6 multihoming ························································································· 369

Restrictions and guidelines for EVPN VPLS over SRv6 multihoming ···················································· 369

Assigning an ESI to an interface or VSI ································································································· 370

Setting the redundancy mode ················································································································ 370

Configuring local FRR for EVPN VPLS over SRv6 ················································································ 371

Enabling VSIs to ignore the state of ACs ······························································································· 372

Enabling ARP flood suppression···················································································································· 373

Test the connectivity of an SRv6 PW ············································································································· 373

Using ping to test the connectivity of an SRv6 PW ················································································ 373

Using tracert to test the connectivity of an SRv6 PW ············································································· 374

Verifying and maintaining EVPN VPLS over SRv6 ························································································ 374

Displaying BGP EVPN route information ······························································································· 374

Displaying EVPN VPLS over SRv6 running status ················································································ 375

Displaying MAC address and ARP entries ····························································································· 375

Displaying EVPN VPLS over SRv6 forwarding entries ·········································································· 376

EVPN VPLS over SRv6 configuration examples ··························································································· 376

Example: Setting up an SRv6 tunnel between single-homed EVPN VPLS sites ··································· 376

Example: Configuring EVPN VPLS over SRv6 multihoming (static link aggregation dual-homed) ······· 380

Example: Configuring EVPN VPLS over SRv6 multihoming (S-Trunk dual-homed) ····························· 386

Configuring distributed SRv6 gateways ····················································· 394

About distributed SRv6 gateways ·················································································································· 394

Distributed SRv6 gateway deployment ·································································································· 394

Control plane working mechanisms ······································································································· 394

Data plane traffic forwarding ·················································································································· 395

Restrictions and guidelines: Distributed SRv6 gateway configuration ··························································· 396

Distributed SRv6 gateway tasks at a glance ·································································································· 396

Prerequisites for distributed SRv6 gateway configuration ············································································· 396

Creating a VSI ················································································································································ 396

Configuring an EVPN instance ······················································································································ 397

Configuring SRv6 SIDs ·································································································································· 398

Configuring a VSI interface as a distributed SRv6 gateway ·········································································· 398

Configuring the route recursion mode ············································································································ 399

Configuring SRv6 TE policy traffic steering···································································································· 400

Restrictions and guidelines for SRv6 TE policy traffic steering ······························································ 400

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Configuring color-based traffic steering ································································································· 400

Configuring tunnel policy-based traffic steering ····················································································· 401

Mapping ACs to a VSI ···································································································································· 402

Mapping a Layer 3 interface to a VSI ····································································································· 402

Mapping an Ethernet service instance to a VSI ····················································································· 403

Configuring PEs to exchange BGP EVPN routes ·························································································· 404

Specifying a source address for the IPv6 packets encapsulated by a distributed SRv6 gateway ················· 404

Configuring BGP EVPN route redistribution and advertisement ···································································· 405

Redistributing MAC/IP advertisement routes into BGP unicast routing tables ······································· 405

Enabling BGP EVPN route advertisement to the local site ···································································· 405

Managing remote MAC address entries and remote ARP learning ······························································· 406

Disabling MAC address advertisement ·································································································· 406

Disabling learning of MAC addresses from ARP information ································································· 406

Verifying and maintaining distributed SRv6 gateways ··················································································· 407

Distributed SRv6 gateway configuration examples ························································································ 407

Example: Configuring distributed SRv6 gateways ················································································· 407

Configuring EVPN VPWS over SRv6 ························································· 412

About EVPN VPWS over SRv6 ····················································································································· 412

Basic principle ········································································································································ 412

BGP EVPN route advertisement ············································································································ 412

Traffic forwarding ··································································································································· 412

EVPN VPWS over SRv6 multihoming ···································································································· 414

EVPN VPWS over SRv6 FRR ················································································································ 414

EVPN VPWS over SRv6 tasks at a glance ···································································································· 416

Enabling L2VPN ············································································································································· 416

Configuring a cross-connect group and its EVPN instance ··········································································· 417

Configuring SRv6 SIDs ·································································································································· 418

Applying a locator to a cross-connect ············································································································ 418

Configuring the route recursion mode ············································································································ 419

Configuring SRv6 TE policy traffic steering···································································································· 420

Restrictions and guidelines for SRv6 TE policy traffic steering ······························································ 420

Configuring color-based traffic steering ································································································· 420

Configuring tunnel policy-based traffic steering ····················································································· 421

Mapping an AC to a cross-connect ················································································································ 422

Mapping an Ethernet service instance to a cross-connect····································································· 422

Configuring PEs to exchange BGP EVPN routes ·························································································· 423

Specifying a source address for the outer IPv6 header of SRv6-encapsulated EVPN VPWS packets ········· 423

Configuring EVPN VPWS over SRv6 multihoming ························································································ 424

Restrictions and guidelines for EVPN VPWS over SRv6 multihoming ·················································· 424

Assigning an ESI to an interface ············································································································ 424

Setting the redundancy mode on an interface ······················································································· 425

Enabling cross-connects to ignore the state of ACs ·············································································· 425

Configuring FRR for EVPN VPWS over SRv6 ······························································································· 426

Configuring local FRR ···························································································································· 426

Configuring remote FRR ························································································································ 427

Test the connectivity of an SRv6 PW ············································································································· 428

Using ping to test the connectivity of an SRv6 PW ················································································ 428

Using tracert to test the connectivity of an SRv6 PW ············································································· 428

Verifying and maintaining EVPN VPWS over SRv6 ······················································································ 429

Displaying BGP EVPN route information ······························································································· 429

Displaying EVPN VPWS over SRv6 running status ··············································································· 429

Displaying EVPN VPLS over SRv6 forwarding information ··································································· 430

EVPN VPWS over SRv6 configuration examples ·························································································· 430

Example: Setting up an SRv6 tunnel between single-homed EVPN VPWS sites ································· 430

Example: Configuring EVPN VPWS over SRv6 multihoming (static link aggregation dual-homed) ······ 435

Example: Configuring EVPN VPWS over SRv6 multihoming (S-Trunk dual-homed) ···························· 442

Document conventions and icons ······························································ 450

Conventions ··················································································································································· 450

Network topology icons ·································································································································· 451

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Support and other resources ····································································· 452

Accessing Hewlett Packard Enterprise Support····························································································· 452

Accessing updates ········································································································································· 452

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Customer self repair ······························································································································· 453

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1

Configuring SR-MPLS

About SR-MPLS

Segment Routing (SR) is a source routing technology. The source node selects a path for the

packets, and then encodes the path in the packet header as an ordered list of segments. Each

segment is identified by a label called a segment identifier (SID). The SR nodes along the path

forward the packets based on the SIDs in the packets. Only the source node needs to maintain the

path status.

SR can operate with MPLS. In an MPLS network, SR uses MPLS labels as SIDs to forward packets

on an LSP.

SR-MPLS characteristics

SR-MPLS has the following characteristics:

•

SR-MPLS forwards packets based on the existing MPLS infrastructure. No infrastructure

modifications are needed to implement SR on an MPLS network. For more information about

the MPLS infrastructure, see MPLS basics configuration in MPLS Configuration Guide.

•

SR-MPLS expands and optimizes existing IGPs and BGP and uses the IGPs and BGP to

distribute labels.

•

SR-MPLS implements network features such as MPLS TE in a simpler way, eliminating issues

such as heavy and complicated routing protocol deployment.

Basic concepts

•

SR node—A node enabled with the SR-MPLS feature. The ingress node (source node) adds

labels to packets. The transit nodes forward packets based on labels. The egress node

(endpoint node) removes labels and forwards packets to the destination networks. SR nodes

form an SR domain.

•

Segment—An instruction an SR node executes on the incoming packet.

•

SID—Segment ID, which is MPLS label in SR-MPLS.

•

Segment type—The following types of segments are available:

 Prefix segment—SIDs are assigned to nodes based on destination address prefix. The

nodes create prefix-specific forwarding entries.

 Adjacency segment—SIDs are assigned to nodes based on adjacency.

•

SRLSP—Segment routing label switched path, an LSP along which SR uses MPLS labels as

SIDs to forward packets.

•

SRGB—Segment routing global block, a range of global labels dedicated for SR-MPLS prefix

SIDs. Different nodes can have different SRGBs. The minimum label value of an SRGB label

range is referred to as the base value of the SRGB.

•

SRLB—Segment routing local block, a range of local labels dedicated for SR-MPLS adjacency

SIDs. All nodes share the same SRLB. The minimum label value of the SRLB label range is

referred to as the base value of the SRLB.

How SR-MPLS works

SR-MPLS involves the following steps:

2

1. Label allocation for all nodes and links along the packet forwarding paths.

The following methods are available:

 Static segment configuration

 Dynamic SID allocation through an IGP

2. Label forwarding entry installation based on SIDs. All SR-MPLS devices in the SR domain use

the allocated labels to create label forwarding entries.

3. SRLSP setup. You can manually configure SRLSPs, or use an IGP, BGP, or a controller to

dynamically create SRLSPs.

When the ingress node of an SRLSP receives a packet, it adds labels to the packet and forwards the

packet to the egress node through the SRLSP. After receiving a packet from the SRLSP, the egress

node removes the label and forwards the packet based on the routing table.

You can bind a higher layer application (for example, MPLS TE) to an SRLSP to forward traffic of the

application through the SRLSP.

Traffic steering to an SR-MPLS tunnel

SR-MPLS tunnels include SR-MPLS BE tunnels and SR-MPLS TE tunnels.

After an SR-MPLS BE or SR-MPLS TE tunnel is established, traffic cannot be forwarded

automatically through the tunnel. You can use the following methods to steer traffic to an SR-MPLS

BE or SR-MPLS TE tunnel:

Static route

The static route method is a simple, direct method for steering traffic to an SR-MPLS TE tunnel.

This method configures a static route destined for the destination address through the tunnel

interface and allows the static route to recurse to LSP tunnels established by SR-MPLS TE. For

more information about static route recursion to LSP tunnels, see static route configuration in Layer

3—IP Routing Configuration Guide.

Tunnel policy

When traffic of a VPN is forwarded through a tunnel, the traffic is forwarded through an LDP LSP

tunnel by default. To direct the traffic to an SR-MPLS BE or SR-MPLS TE tunnel, you can apply a

tunnel policy or tunnel selector to the VPN.

Based on the service requirements, you can configure one of the following types of tunnel policy to

direct traffic of a VPN to an SR-MPLS BE or SR-MPLS TE tunnel:

•

Tunnel binding—Bind a destination IP address to a tunnel in a tunnel policy. After the tunnel

policy is applied to a VPN, the VPN traffic to the destination IP address will be forwarded by the

bound tunnel.

•

Preferred tunnel—Specify an SR-MPLS TE tunnel as a preferred tunnel in a tunnel policy.

After the tunnel policy is applied to a VPN, the VPN traffic will be forwarded by the preferred

tunnel. This method explicitly specifies a tunnel for a VPN, facilitating traffic planning.

•

Load sharing—Specify the tunnel types (SR-MPLS BE or SR-MPLS TE tunnels) and selection

order and the number of tunnels for load sharing in a tunnel policy.

For more information about tunnel policies, see MPLS Configuration Guide.

PBR

The policy-based routing (PBR) method defines a PBR policy to specify the output interface for

packets that match an ACL as an SR-MPLS TE tunnel interface, and then applies the PBR policy to

the incoming interface of packets. In this way, traffic is redirected to the SR-MPLS TE tunnel.

The PBR method can match the packets to be forwarded by a tunnel interface by packet destination

IP address, source IP address, and protocol type. Compared with the static route method, the PBR

3

method is more flexible but its configuration is more complicated. For more information about PBR,

see policy-based routing configuration in Layer 3—IP Routing Configuration Guide.

Automatic route advertisement

Automatic route advertisement distributes the SR-MPLS TE tunnel to the IGP (OSPF or IS-IS), so

the SR-MPLS TE tunnel can participate in IGP routing calculation.

Automatic route advertisement can be implemented by using the following methods:

•

IGP shortcut—Also known as AutoRoute Announce. It considers the SR-MPLS TE tunnel as a

link that directly connects the tunnel ingress node (source node) and the egress node (endpoint

node). Only the ingress node uses the SR-MPLS TE tunnel during IGP route calculation.

•

Forwarding adjacency—Considers the SR-MPLS TE tunnel as a link that directly connects

the tunnel ingress node and the egress node, and advertises the link to the network through an

IGP. Every node in the network uses the SR-MPLS TE tunnel during IGP route calculation.

As shown in Figure 1, an SR-MPLS TE tunnel exists from Device D to Device C. IGP shortcut

enables only the ingress node Device D to use the SR-MPLS TE tunnel in the IGP route calculation.

Device A cannot use this tunnel to reach Device C. With forwarding adjacency enabled, Device A can

learn this SR-MPLS TE tunnel and transfer traffic to Device C by forwarding the traffic to Device D.

Figure 1 IGP shortcut and forwarding adjacency

Static segment configuration

Static SR-MPLS provides the following methods for configuring static segments for a destination:

•

Prefix segment method—Manually configure the incoming label, outgoing label, and next hop

for the destination address prefix on each SR node.

•

Adjacency segment method—Manually configure the incoming label and next hop for the

adjacency to the neighbor on each SR node.

Dynamic SID allocation through an IGP

SR-MPLS expands IGP protocols such as IS-IS and OSPF to advertise SIDs in IGP protocol packets.

SR-MPLS provides the following methods for dynamically allocating and advertising SIDs:

•

Prefix SID.

•

Adjacency SID.

Device D

Device A

Device B

Device C

Device E

10

20

10

20

4

Prefix SID

After you configure an SID for the loopback address on each SR node, the SIDs uniquely identify the

SR nodes. All SR nodes in the SR domain use an IGP to advertise their own prefix SIDs. After

receiving advertised prefix SIDs, each SR node calculates the prefix SIDs to the advertisers.

The prefix SID advertisement can be one of the following types:

•

Absolute value advertisement—Each SR node advertises the prefix SID absolute value and

the SRGB.

•

Index value advertisement—Each SR node advertises the prefix SID index and the SRGB.

Each SR node is assigned a globally unique index value for the node's prefix. The prefix SID an SR

node allocates to a prefix equals the SRGB base of the SR node plus the index for that prefix.

NOTE:

The device supports only the index value advertisement in the current software release.

Adjacency SID

SR nodes use an IGP to advertise SIDs allocated to the IGP adjacencies (that is, the links to its IGP

neighbors). The SIDs are used to identify the links.

The adjacency SIDs can be allocated automatically or manually.

•

Automatic adjacency SID allocation—SR nodes allocate labels in SRLBs to the IGP

adjacencies as SIDs.

•

Manual adjacency SID allocation—You can assign adjacency SID by using absolute values

or index values. If you use index values, the adjacency SID of a link is the base value of the

SRLB plus the index value for the link.

Dynamic SID allocation through BGP

SR-MPLS expands BGP to advertise prefix SIDs in BGP protocol packets. BGP uses routing policies

to assign SIDs to prefixes when redistributing routes. The SIDs uniquely identify the SR nodes. All

SR nodes in the SR domain use BGP to advertise their own prefix SIDs, including the SIDs and SID

index values. From received advertisement packets, each SR node derives the prefix SIDs for the

advertisers.

BGP prefix SIDs can be exchanged between BGP peers only through IPv4 unicast routes.

Dynamic SID allocation through BGP applies to MPLS VPN inter-AS option C networks.

SID allocation through BGP EPE

The BGP Egress Peer Engineering (BGP EPE) feature assigns labels to BGP peers to steer traffic

across ASs to specific BGP neighbors or links.

After you configure BGP EPE on a device, the device assigns SIDs to connected BGP peers or peer

groups to identify the BGP neighbors or links. These SIDs are called BGP peering SIDs or BGP

peering segments.

BGP peering segments or SIDs fall into the following types:

•

Peer Node Segment (Peer Node SID)—Node type, typically assigned to a BGP neighbor that

has used a directly connected interface to establish a BGP session with the device.

•

Peer Adjacency Segment (Peer Adjacency SID)—Adjacency type, typically assigned to a

BGP neighbor that uses a loopback interface to establish a BGP session with the device.

•

Peer Set Segment (Peer Set SID)—Set type, typically assigned to links when multiple equal

cost multi-path (ECMP) paths exist between the device and a BGP neighbor.

5

SIDs that BGP EPE assigns are locally significant. These SIDs are not advertised to other devices

and are not affected by route types exchanged between BGP peers.

SID allocation through BGP EPE is typically used for MPLS VPN inter-AS option B.

Label forwarding entry installation based on SIDs

Label forwarding entry installation based on IGP prefix SIDs

Label forwarding entries based on prefix SIDs can be static or dynamic.

•

Static label forwarding entries—The device creates local label forwarding entries based on

manually configured incoming labels, outgoing labels, and next hops.

•

Dynamic label forwarding entries—The device uses the IGP to flood in the SR domain the

local SRGB and the index of the prefix SID for the local loopback interface. Based on the

flooded information, the other devices in the domain calculates their local label forwarding

entries by using the following rules:

 Incoming label = Local SRGB base value + Index

 Outgoing label = SRGB base value of the next hop + Index

Figure 2 Creating label forwarding entries based on IGP prefix SIDs

Figure 2 shows how dynamic label forwarding entries are created. After you assign index value 201

to loopback address 1.1.1.1/32 on Device C, Device C uses an IGP packet to advertise the index

value and its local SRGB. Then, the devices calculate incoming and outgoing labels according to the

previously mentioned label calculation rules.

•

Devices C calculates its incoming label, which is 16201.

•

Device B calculates its incoming label and outgoing label and creates a label forwarding entry.

The incoming label is 16201. The outgoing label is 16201. The next hop is Device C.

•

Device A calculates its incoming label and outgoing label and creates a label forwarding entry.

The incoming label is 16201. The outgoing label is 16201. The next hop is Device B.

Label forwarding entry installation based on BGP prefix SIDs

The device redistributes routes to BGP and assigns prefix SIDs to redistributed routes based on

routing policies. Then, the device uses BGP to flood in the SR domain the prefix SIDs and the

indexes of the prefix SIDs. Based on the flooded information, the other devices in the domain

calculates their local label forwarding entries by using the following rules:

•

Incoming label = Local SRGB base value + Index

•

Outgoing label = Received SID

Device A Device B Device C

1000

Range

SRGB Base

16000 1000

Range

SRGB Base

16000 1000

Range

SRGB Base

16000

L

o

p

0

1

.

1

.

1

.

1

/

3

2

201

Device B

Nexthop

In Label

16201 Out Label

16201 Device C

NexthopIn Label

16201 Out Label

16201 In Label

16201

6

Figure 3 Creating label forwarding entries based on BGP prefix SIDs

Figure 3 shows how label forwarding entries are created. After you assign index value 201 to

loopback address 1.1.1.1/32 on Device D, Device D redistributes the route of the address and

assigns it an SID (16201 in this example). Then, the device uses a BGP packet to advertise the SID

and index value. The devices in the SR domain calculate incoming and outgoing labels according to

the previously mentioned label calculation rules and create label forwarding entries.

•

Devices D calculates its incoming label, which is 16201.

•

Device C calculates its incoming label and outgoing label and creates a label forwarding entry.

The incoming label is 16201. The outgoing label is 16201. The next hop is Device D.

•

Device B calculates its incoming label and outgoing label and creates a label forwarding entry.

The incoming label is 16201. The outgoing label is 16201. The next hop is Device C.

•

Device A calculates its incoming label and outgoing label and creates a label forwarding entry.

The incoming label is 16201. The outgoing label is 16201. The next hop is Device B.

Label forwarding entry installation based on BGP EPE

Configure BGP EPE on border devices to assign SIDs to specific peers or peer groups.

Figure 4 Creating label forwarding entries by using BGP EPE

As shown in Figure 4, you can configure BGP EPE on Device B to assign BGP peering SIDs to

EBGP neighbors Device C and Device D. BGP peering SIDs are locally significant and are not

advertised to neighbors.

Label forwarding entry installation based on adjacency SIDs

When using adjacency SIDs, each device allocates a static or dynamic incoming label to the link to

its neighbor. The label has local significance. Multiple devices can use the same adjacency SID.

EBGP

AS 100 AS 200

IBGP IBGP L

o

p

0

1

.

1

.

1

.

1

/

3

2

201

In Label

16201

8000

Range

SRGB Base

16000

8000

Range

SRGB Base

160008000

Range

SRGB Base

16000

Device DDevice CDevice BDevice A

Device D

NexthopIn Label

16201 Out Label

16201

Device C

Nexthop

In Label

16201 Out Label

16201

Device B

NexthopIn Label

16201 Out Label

16201

8000

RangeSRGB Base

16000

EBGP

AS 100 AS 200

IBGP

Device E

Device D

Device B

Device A

Device C

EBGP

IBGP

Device D

Nexthop

In Label

6000

Device C

Nexthop

In Label

5000

7

Figure 5 Creating label forwarding entries based on adjacency SIDs

As shown in Figure 5, the devices are running the same IGP. After IGP adjacencies are established

between the devices, Device A, Device B, and Device C allocates labels and creates label

forwarding entries as follows:

•

Device A allocates label 203 to the link to its neighbor Device B.

•

Device B allocates label 202 to the link to its neighbor Device C.

•

Device C allocates label 201 to the link to its neighbor Device D.

•

Device A creates a label forwarding entry with incoming label 203 and next hop Device B.

•

Device B creates a label forwarding entry with incoming label 202 and next hop Device C.

•

Device C creates a label forwarding entry with incoming label 201 and next hop Device D.

SRLSP setup

You can use the following methods to create SRLSPs:

•

Manually configure an SRLSP.

To configure an SRLSP, you must specify the label stack for packets to be forwarded along the

SRLSP on the ingress node. Each label in the stack corresponds to a prefix SID or adjacency

SID. The system can look for the outgoing label and next hop based on the prefix SID or

adjacency SID.

•

Configure SR nodes to use BGP or an IGP to dynamically establish an SRLSP.

SR nodes follow these steps to establish SRLSPs:

a. Use BGP or an IGP to collect prefix SID information from the SR-MPLS network.

b. Calculate the shortest paths to other SR nodes based on the collected prefix SID

information and the BGP or IGP network topology.

c. Establish SRLSPs based on the shortest paths.

•

Configure a controller to deploy SRLSP configuration to the device so the device creates

SRLSPs.

For more information about controller configuration, see the user guide for the controller.

Packet forwarding in SR-MPLS

Based on the SID allocation method, SR-MPLS uses one of the following packet forwarding

methods:

•

Prefix SID-based packet forwarding—The ingress node encapsulates the prefix SID for the

egress node to a packet. The transit nodes forward the packet based on label forwarding

entries.

•

Adjacency SID-based packet forwarding—The ingress node encapsulates the label stack

that contains the adjacency SIDs of all links along the forwarding path to a packet. Each transit

node uses the top label in the label stack to determine the next hop and pops the top label

before forwarding the packet to the next hop.

•

Prefix and adjacency SID-based packet forwarding—The nodes use prefix SID-based

packet forwarding in combination with adjacency-based packet forwarding.

Device A Device B Device C

Device B

Nexthop

In Label

203 Device C

Nexthop

In Label

202 Device D

Nexthop

In Label

201

Device D

8

Prefix SID-based packet forwarding within the same AS

Figure 6 shows how a packet is forwarded along the SRLSP from Device A to Device E based on

prefix SIDs. In this example, the outgoing label for the packet is 16201 on Device A.

1. Ingress node Device A searches for a forwarding entry for label 16201, adds outgoing label

16201 to the packet and sends the packet to the next hop (Device B).

2. When transit node Device B receives the packet, it searches for a label forwarding entry that

matches the label in the packet. Then, Device B uses the outgoing label of the matched entry

(16201) to replace the label in the packet and forwards the packet to the next hop (Device C).

3. Transit nodes Device C and Device D process the packet in the same way Device B does.

4. When egress node Device E receives the packet, it removes the label and forwards the packet

by IP address.

Figure 6 Prefix SID-based packet forwarding within the same AS

Prefix SID-based packet forwarding across ASs

Figure 7 shows how a packet is forwarded along the SRLSP from Device A to Device D based on

prefix SIDs. In this example, the outgoing label for the packet is 16201 on Device A.

1. Ingress node Device A searches for a forwarding entry for label 16201, adds outgoing label

16201 to the packet, and sends the packet to the next hop (Device B).

2. When transit node Device B receives the packet, it searches for a label forwarding entry that

matches the label in the packet (16201). Then, Device B uses the outgoing label of the matched

entry (16201) to replace the label in the packet and forwards the packet to the next hop (Device

C).

3. Transit nodes Device C processes the packet in the same way Device B does.

4. When egress node Device D receives the packet, it removes the label and forwards the packet

by IP address.

Figure 7 Prefix SID-based packet forwarding across ASs

Device A Device B Device C Device D Device E

Device B

Nexthop

In Label

16201 Out Label

16201

Device C

Nexthop

In Label

16201 Out Label

16201

Device D

Nexthop

In Label

16201 Out Label

16201

Device E

Nexthop

In Label

16201 Out Label

16201

In Label

16201

IP data 16201

IP data

SRGB: 16000-17000

EBGP

AS 100 AS 200

IBGP IBGP Device D

Device C

Device BDevice A

Device D

NexthopIn Label

16201 Out Label

16201

Device C

NexthopIn Label

16201 Out Label

16201

IP data 16201

IP data

In Label

16201

IP data

Device B

NexthopIn Label

16201 Out Label

16201

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