H3C S9500 Series Operating instructions

Brand: H3C

Model: S9500 Series

Category: Networking

Type: Operating instructions

Operation Manual – MPLS L3VPN

H3C S9500 Series Routing Switches Table of Contents

Table of Contents

Chapter 1 MPLS L3VPN Configuration........................................................................................1-1

1.1 MPLS L3VPN Overview.....................................................................................................1-1

1.1.1 MPLS L3VPN Model...............................................................................................1-2

1.1.2 MPLS L3VPN Implementation ................................................................................1-5

1.1.3 Nested MPLS L3VPN Implementation....................................................................1-7

1.1.4 Hierarchical MPLS L3VPN Implementation............................................................1-8

1.1.5 Introduction to OSPF Multi-Instance.......................................................................1-9

1.1.6 Introduction to Multi-Role Host..............................................................................1-10

1.2 MPLS L3VPN Configuration............................................................................................1-11

1.2.1 Configuring Various Kinds of Routers................................................................... 1-11

1.2.2 Configuring CE Router..........................................................................................1-11

1.2.3 Configuring PE Router..........................................................................................1-13

1.2.4 Configuring P Router.............................................................................................1-26

1.3 Displaying and Debugging MPLS L3VPN .......................................................................1-26

1.4 Typical MPLS L3VPN Configuration Examples...............................................................1-28

1.4.1 Integrated MPLS L3VPN Configuration Example................................................. 1-28

1.4.2 Extranet Configuration Example ...........................................................................1-34

1.4.3 Hub&Spoke Configuration Example .....................................................................1-39

1.4.4 CE Dual-home Configuration Example.................................................................1-45

1.4.5 Cross-domain MPLS L3VPN Configuration Example...........................................1-51

1.4.6 Cross-Domain MPLS L3VPN Configuration Example — Option C ......................1-56

1.4.7 Hierarchical MPLS L3VPN Configuration Example ..............................................1-64

1.4.8 OSPF Multi-instance Sham-link Configuration Example.......................................1-67

1.4.9 Nested MPLS L3VPN Configuration Example......................................................1-73

1.4.10 OSPF Multi-instance CE Configuration Example................................................1-79

1.4.11 Multi-Role Host Configuration Example..............................................................1-81

1.4.12 FIB Entry Application Configuration Example.....................................................1-85

1.5 Troubleshooting MPLS L3VPN Configuration.................................................................1-88

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Chapter 1 MPLS L3VPN Configuration

When configuring MPLS L3VPN, go to these sections for information you are interested

in:

z MPLS L3VPN Overview

z MPLS L3VPN Configuration

z Displaying and Debugging MPLS L3VPN

z Typical MPLS L3VPN Configuration Examples

z Troubleshooting MPLS L3VPN Configuration

1.1 MPLS L3VPN Overview

Traditional VPN, for which Layer 2 tunneling protocols (L2TP, L2F and PPTP, and so

on.) or Layer 3 tunnel technology (IPSec, GRE and so on.) is adopted, is a great

success and is therefore widely used. However, along with the increase of the size of

VPNs, the deficiency of traditional VPN in such aspects as expansibility and

manageability becomes more and more obvious. In addition, QoS (Quality of Service)

and security are also the difficult problem for traditional VPN.

Using the MPLS technology, service providers can implement the IP-based VPN

services easily and enable their networks to meet the expansibility and manageability

requirement for VPN. The VPN constructed by using MPLS also provides the possibility

for the implementation of value-added service. Multiple VPNs can be formed from a

single access point, and each VPN represents a different service, making the network

able to transmit services of different types in a flexible way.

The H3C S9500 series routing switches provide full MPLS L3VPN networking

capabilities:

z Address isolation, allowing the overlap of addresses of different VPNs and public

networks.

z Supporting MBGP advertising VPN routing information through public networks,

establishing MPLS L3VPN.

z Forwarding VPN data stream over MPLS LSP.

z Providing MPLS VPN performance monitoring and fault detecting tools.

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1.1.1 MPLS L3VPN Model

I. MPLS L3VPN model

Figure 1-1 MPLS L3VPN model

As shown in

Figure 1-1, MPLS L3VPN model contains three parts: CE, PE and P.

z CE (Customer Edge) device: It is a composing part of the customer network, which

is usually connected with the service provider directly through an interface. It may

be a router or a switch which cannot sense the existence of VPN.

z PE (Provider Edge) device: It is an edge device of the provider network,

connecting with CE devices directly. In MPLS network, a PE device processes all

the operations for VPN. PE needs to possess MPLS basic forwarding capability.

z P (Provider) device: It is the backbone router in the provider network, which is not

connected with CE directly. P router needs to possess MPLS basic forwarding

capability.

The classification of CE and PE mainly depends on the range for the management of

the provider and the customer, and CE and PE are the edges of the management

ranges.

II. Nested MPLS L3VPN model

In a basic MPLS L3VPN model, the PEs are in the network of the service provider and

are managed by the service provider.

When a VPN user wants to subdivide the VPN into multiple VPNs, the traditional

solution is to configure these VPNs directly on the PEs of the service provider. This

solution is easy to implement, but has the following disadvantages: the number of the

VPNs carried on PEs may increase rapidly; the operator may have to perform more

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operations when required by a user to adjust the relation between the user's internal

VPNs. These disadvantages not only increase the network operating cost, but also

bring relevant management and security issues.

The nested VPN is a better solution. Its main idea is to transfer VPNv4 route between

PE and CE of common MPLS L3VPN such that user themselves can manage their

internal VPN division, and the service provider can be saved from participating into

users' internal VPN management.

The following figure shows the network model for nested VPN:

VPN3

VPN2

VPN1

CE1

CE2

CE3

CE4

VPN2

VPN3

CE6

VPN

CE7

VPN

VPN1

CE5

Figure 1-2 Network model for nested MPLS L3VPN

III. Basic concepts in MPLS L3VPN

1) VPN-instance

VPN-instance is an important concept in VPN routing in MPLS. In an MPLS VPN

implementation, each site corresponds to a specific VPN-instance on PE (their

association is implemented by binding VPN-instance to the VLAN interface). If

subscribers on one site belong to multiple VPNs, then the corresponding VPN-instance

includes information about all these VPNs.

Specifically, such information should be included in VPN-instance: label forwarding

table, IP routing table, the interfaces bound with VPN-instance, and the management

information (RD, route filtering policy, member interface list, and so on). It includes the

VPN membership and routing rules of this site.

PE is responsible for updating and maintaining the relationship between VPN-instance

and VPN. To avoid data leakage from the VPN and illegal data entering into the VPN,

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each VPN-instance on the PE has an independent set of routing table and label

forwarding table, in which the forwarding information of the message is saved

2) MBGP

MBGP (multiprotocol extensions for BGP-4, see RFC2283) propagates VPN

membership information and routes between PE routers. It features backward

compatibility: It not only supports traditional IPv4 address family, but also supports

other address families, for example, VPN-IPv4 address family. MP-BGP ensures that

VPN private routes are only advertised within VPNs, as well as implementing

communication between MPLS VPN members.

3) VPN-IPv4 address

VPN is just a private network, so it can use the same IP address to indicate different

sites. But the IP address is supposed as unique when MP-BGP advertises CE routes

between PE routers, so routing errors may occur for the different meaning in two

systems. The solution is to switch IPv4 addresses to VPN-IPv4 address to generate

globally unique addresses before advertising them, so PE routers is required to support

MP-BGP.

A VPN-IPv4 address consists of 12 bytes, and the first eight bytes represent the RD

(Route Distinguisher), which are followed by a 4-byte IPv4 address. The service

providers can distribute RD independently. However, their special AS (Autonomous

System) number must be taken as a part of the RD. After being processed in this way,

even if the 4-byte IPv4 address contained in VPN-IPv4 address has been overlapped,

the VPN-IPv4 address can still maintain globally unique. RD is only used within the

carrier network to differentiate routes. When the RD is 0, a VPN-IPv4 address is just a

IPv4 address in general sense.

The route received by PE from CE is the IPv4 route that needs to be redistributed into

VPN-instance routing table, and in this case a RD needs to be added. It is

recommended that the same RD be configured for all routes from the same user site.

IV. VPN Target attribute

VPN Target attribute is one of the MBGP extension community attributes and is used to

limit VPN routing information advertisement. It identifies the set of sites that can use

some route, namely by which Sites this route can be received, and the PE router can

receive the route transmitted by which Sites. The PE routers connected with the site

specified in VPN Target can all receive the routes with this attribute.

For PE routers, there are two sets of VPN Target attributes: one of them, referred to as

Export Targets, is added to the route received from a direct-connect site in advertising

local routes to remote PE routers. And the other one, known as Import Targets, is used

to decide which routes can be imported into the routing table of this site in receiving

routes from remote PE routers.

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When matching the VPN Target attribute carried by the route to filter the routing

information received by the PE router, if the export VPN target set of the received route

contains identical items with the import VPN target set of the local end, the route is

imported into the VPN routing table and then advertised to the connected CE .

Otherwise, the route will be rejected.

Figure 1-3 Route filtering through matching VPN Target attribute

 Note:

The routes for other VPNs will not appear in the VPN's routing table by using VPN

Target attribute to filter routing information received at PE router, so the CE-transmitted

data will only be forwarded within the VPN.

V. Routing policy

If the advertisement of routing information needs to be controlled in a more accurate

manner than using egress extended community attributes only, you can use an

outgoing routing policy.

In the outgoing routing policy you can set specific extended community attributes for

specific routes to be advertised.

After creating a VPN instance, you can choose whether to configure an outgoing

routing policy for it.

1.1.2 MPLS L3VPN Implementation

MPLS L3VPN works on this principle: It uses BGP to propagate VPN private routing

information on carrier backbone network, and uses MPLS to forward VPN service

traffic.

The following are introductions to MPLS L3VPN implementation from two aspects:

advertising VPN routing information and forwarding VPN packets.

I. Advertising VPN routing information

Routing information exchange has the following four types:

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1) Between CE and PE

A PE router can learn routing information about the CE connected to it through static

route, RIP (supporting multi-instance), OSPF (supporting multi-instance) or EBGP, and

imports it in a vpn-instance.

2) Between ingress PE and egress PE

The ingress PE router uses MP-BGP to send information across public network: It

advertises routing information learned from CE to the egress PE router (with MPLS

label) and learns the CE routing information learned at the egress PE router.

The internal connectivity among the VPN internal nodes is ensured through enabling

IGP (for example, RIP and OSPF) or configuring static routes on the PEs.

3) LSP setup between PEs

LSPs must be set up between PEs for VPN data traffic forwarding with MPLS LSP. The

PE router which receives packets from CE and create label protocol stack is called

Ingress LSR, while the BGP next hop (Egress PE router) is Egress LSR. Using LDP to

create fully connected LSPs among PEs.

4) Between PE and CE

A CE can learn remote VPN routes from the PE connected through static routes, RIP,

OSPF or EBGP.

With above-mentioned steps, reachable routes can be established between CEs, for

transmission of VPN private routing information over public network.

II. Forwarding VPN packets

On the ingress PE, two-layer label stack is formed for each VPN packet:

Interior-layer label, also called MPLS label, is at the bottom of the label stack and

distributed by M-BGP when the egress PE advertises routing information (in VPN

forwarding table) to ingress GE. When VPN packets from public network reach the CE,

they can be forwarded from the designated interface to the designated CE or site by

searching for the target MPLS forwarding table according to the labels contained.

Exterior-layer label, known as LSP initialization label, distributed by MPLS LDP, is at

the top of the label stack and indicates an LSP from the ingress PE to egress PE. By the

switching of exterior-layer label, VPN packets can be forwarded along the LSP to the

peer PE.

Figure 1-4 illustrates the details:

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1.1.1.2

Layer2

Layer1

1.1.1.2

Layer2

1.1.1.2

PE2

Site 1

CE1

PE1

1.1.1.1/24

CE2

1.1.1.2

Layer 2

Layer 1

1.1.1.2

Layer 2

1.1.1.2

Site 2

1.1.1.2/24

Figure 1-4 Forwarding VPN packets

1) Site 1 sends an IPv4 packet with the destination address 1.1.1.2 of to CE1. CE1

looks up the IP routing table for a matched entry and sends the packet to PE1

according to the matched entry.

2) Depending on the interface the packet reaches and the destination of it, PE1 looks

up the VPN-instance entry to obtain interior-layer label, exterior-layer label, BGP

next hop (PE2), and output interfaces. After the establishment of labels, PE1

forwards MPLS packets to the first P of LSP through output interface.

3) Each P router on LSP forwards MPLS packets using exterior-layer label to the

penultimate-hop router, namely the P router before PE2. The penultimate-hop

router extracts the exterior-layer and sends MPLS packet to PE2.

4) PE2 looks up in the MPLS forwarding table according to the interior-layer label and

destination address to determine the egress interface for labeling operation and

the packet. It then extracts the interior-layer label and forwards through the egress

interface the IPv4 packet to CE2.

5) CE2 looks up in the routing table and sends the packet in normal IPv4 packet

forwarding mode to the site2.

1.1.3 Nested MPLS L3VPN Implementation

When implementing a nested MPLS L3VPN, pay attention to the following items:

z No address overlap is allowed between user's internal sub-VPNs.

z To ensure the VPN routing information is correctly advertised over the backbone

network, the VPN-Targets of the user VPN and the internal sub-VPNs cannot be

overlapped and must be specified by the service provider.

z The provider PE and the customer PE must be directly connected and cannot

exchange VPNv4 route in Multihop-EBGP mode.

Before configuring a nested MPLS L3VPN, you must complete the following tasks:

z Configuring IGP on the MPLS backbone network (including provider PE and P

routers) to implement the IP connectivity on the backbone network.

z Configuring basic MPLS capability on the MPLS backbone network.

z Configuring MPLS LDP and setting up LDP LSP on the MPLS backbone network.

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z Configuring BGP on the MPLS backbone network (create IBGP peers between

provider PEs).

z Configuring basic MPLS capability on user-end network (including customer PEs).

1.1.4 Hierarchical MPLS L3VPN Implementation

As PE is required to aggregate multiple VPN routes on a MPLS L3VPN, it is prone to

forming a bottleneck in a large-scale deployment or in the case that PE capacity is

small. To solve the problem, Hangzhou H3C Technologies Co., Ltd. introduced the

HoVPN (Hierarchy of VPN, Hierarchical MPLS L3VPN) solution.

Hierarchical MPLS L3VPN divides an MPLS VPN into several MPLS VPNs in a

hierarchical network structure. Each VPN takes on a role depending on its level. There

are high performance requirements in routing and forwarding on the PEs at the higher

level of MPLS VPN, because they are primarily used for connecting the backbone

networks and providing access service for huge VPN clients. However, such

requirements are relatively low for PEs at the lower level of the network as they

primarily function to access the VPN clients at the edges. Congruous with the IP

network model, HoVPN model improves the scalability of MPLS L3VPN, and hence

allows lower-layer MPLS VPNs comprising low-end equipment to provide MPLS VPN

accessing and interconnect through the high-end MPLS VPN backbone.

As shown in

Figure 1-5, the PEs directly connected with user devices are called UPE

(underlayer PE or user-end PE); the devices in the core network connected with the

UPEs are called SPE (superstratum PE or service-provider-end PE).

Hierarchical PEs have the same appearance as that of the traditional PEs and can

coexist with other PEs in the same MPLS network.

UPEs are responsible for user access; they only maintain the routes of directly

connected VPN sites, but not that of the remote sites. SPEs, however, are responsible

for the maintenance and advertisement of VPN routes; they maintain all the routes of

the VPNs connected by their UPEs, including the routes in both local and remote sites.

UPE and SPE are relative concepts. In a multi-layer PE architecture, an upper layer PE

is an SPE for its lower layer PE, and a lower layer PE is an UPE for its upper layer PE.

The MBGP runs between SPE and UPE can be either MP-IBGP or MP-EBGP,

depending on whether the SPE and the UPE are in the same AS.

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Figure 1-5 Hierarchical MPLS L3VPN

1.1.5 Introduction to OSPF Multi-Instance

As one of the most popular IGP routing protocols, OSPF is used as an internal routing

protocol in many VPNs. Using OSPF on PE-CE links brings convenience to you

because in this case CE routers only need to support OSPF protocol, without the need

of supporting other protocols, and network administrator only have to know the OSPF

protocol. If you want to transform conventional OSPF backbone into MPLS L3VPN,

using OSPF between PE and CE can simplify this transform process.

Therefore IETF raised two new OSPF VPN extension drafts, to provide a complete

solution to SPPF problems in MPLS L3VPN application when OSPF is used as PE-CE

routing protocol. In this case, PE router must be able to run multiple OSPF instances,

each of which corresponds to one VPN instance, owns an individual interface, routing

table, and sends VPN routing information over MPLS network using BGP/OSPF

interaction.

If supporting OSPF multi-instance, one router can run multiple OSPF processes, which

can be bound to different VPN instances. In practice, you can create one OSPF

instance for each service type. OSPF multi-instance can fully isolate different services

in transmission, which can solve security problems with low cost to meet the needs of

customers. Generally, OSPF multi-instance is run on PEs; The CE running OSPF

multi-instance in the LAN is called multi-VPN-instance CE. At present, isolation of LAN

services implements by VLAN function of the switch. OSPF Multi-VPN-Instance CE

provides schemes of services isolation implemented on routers.

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Area 2

OSPF 100 VPN

GREEN

Area0

OSPF 100 VPN

OSPF200 VPN

GREEN

Area1

Area0

OSPF100 VPN

RED

OSPF 200 VPN

GREEN

RED

Area1

CE11

CE12

CE31

CE22

PE1 PE2

PE3

Area 1

MPLS VPN Backbone

VPN-RED

Site1

OSPF

Area0

Site1

OSPFArea1

GREEN

Site2

OSPFArea2

Site2

OSPF Area1

CE21

VPN-

GREEN

VPN-

VPN-RED

Figure 1-6 OSPF multi-instance application in MPLS L3VPN PE

MPLS

Network

R&D

Engineering

Finances

ospf 100

vpn

ospf 300

vpn

finances

ospf

vpn

finances

ospf

200

vpn

engineering

-----

ospf

ospf 200

vpn

ospf 300

vpn

finances

ospf 300

vpn

ospf

vpn

-----

ospf

100

vpn

engineering

-----

ospf

-----

Multi

VPN

Instance CE

Multi

VPN

Figure 1-7 Multi-VPN-instance CE application in conventional LAN

1.1.6 Introduction to Multi-Role Host

The VPN attribute of the packets from a CE to its PE lies on the VPN bound with the

ingress interface. This, in fact determines that all the CEs forwarded by the PE through

the same ingress interface belong to the same VPN; but in actual network

environments, a CE may need to access multiple VPNs through one physical interface.

Though you can configure different logical interfaces to meet this need, this

compromised method brings additional configuration burden and has limitation in

actual use.

To resolve this problem, the idea of multi-role host is generated. Specifically to say, this

idea is to differentiate the accesses to different VPNs through configuring policy routing

based on IP addresses, and transmit downstream data flow from PE to CE by

configuring static routing. The static routing under multi-role host circumstance is

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different from common hosts; it is implemented by specifying an interface of another

VPN as the egress interface through a static route in a VPN; and thus allowing one

logical interface to access multiple VPNs.

1.2 MPLS L3VPN Configuration

1.2.1 Configuring Various Kinds of Routers

Implementing MPLS L3VPN functions requires the following procedures in general:

Configure basic information on PE, CE and P; establish the logical or physical link with

IP capabilities from PE to PE; advertise and update VPN network information.

I. CE router

The configuration on CE is relative simple. Only static route, RIP, OSPF or EBGP

configuration is needed for VPN routing information exchange with the PE connected,

MPLS configuration is not needed.

II. PE router

The configuration on PE is relative complex. After the configuration, the PE implements

MPLS L3VPN core functions.

The following sections describe the configuration tasks on a PE device:

z Configuring basic MPLS capability

z Defining MPLS L3VPN site

z Configuring PE-CE route exchanging

z Configuring PE-PE route exchanging

III. P router

The configuration on P device is relative simple. The main task is to configure MPLS

basic capacity on the P device to support LDP and MPLS forwarding.

The following are detailed configurations.

1.2.2 Configuring CE Router

As a customer-side device, only basic configuration is required on a CE router, for

routing information exchange with PE router. Currently route switching modes available

include static route, RIP, OSPF, EBGP, and so on.

I. Creating static route

If you select static route mode for CE-PE route switching, you should then configure a

private static route pointing to PE on CE.

Perform the following configuration in the system view to create/delete a static route in

VPN instance routing table:

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To do... Use the command...

Create a specified

VPN-instance static

route

ip route-static [ vpn-instance vpn-instance-name-list ]

ip-address { mask | mask-length } { interface-type

interface-number | vpn-instance vpn-instance-name

nexthop-ip-address } [ public ] [ preference

preference-value | tag tag-value | public ] * [ reject |

blackhole ] [ description text ]

Delete a specified

VPN-instance static

route

undo ip route-static vpn-instance vpn-instance-name-list

destination-ip-address { mask | mask-length }

[ interface-name | vpn-instance vpn-nexthop-name ]

nexthop-ip-address [ public ] [ preference

preference-value ]

By default, the preference value for a static route is 60. You can also specify preference

for a static route.

II. Configuring RIP

If you select RIP mode for CE-PE route switching, you should then configure RIP on

CE.

III. Configuring OSPF

If you select OSPF mode for CE-PE route switching, you should then configure OSPF

on CE.

You must configure OSPF multi-instance to isolate services of different VPNs on CE

router, which is now called Multi-VPN-Instance CE.

You can bind OSPF processes with VPN with the following command in OSPF view.

Table 1-1 Configure the router as multi-VPN-instance CE

To do... Use the command...

Configure the router as multi-VPN-instance CE

vpn-instance-capability simple

Remove the configuration

undo vpn-instance-capability

IV. Configuring EBGP

If you select BGP mode for CE-PE route switching, you should then configure EBGP

peer, import direct-connect route, static route and other IGP routes, for BGP to

advertise VPN routes to PE.

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1.2.3 Configuring PE Router

I. Configuring basic MPLS capability

It includes configuring MPLS LSR ID, enable MPLS globally and enable MPLS in the

corresponding VLAN interface view.

Refer to MPLS Configuration.

II. Defining MPLS L3VPN site

1) Create VPN-instance and enter VPN-instance view

The VPN instance is associated with a site. The VPN membership and routing rules of

a site is configured in the corresponding VPN instance.

This command is used to create a new VPN-instance and enter the VPN-instance view,

or directly enter the VPN-instance view if the VPN-instance already exists.

Perform the following configuration in the system view to create a VPN-instance and

enter VPN-instance view:

To do... Use the command...

Create a VPN-instance and

enter VPN-instance view

ip vpn-instance vpn-instance-name

Delete a VPN-instance undo ip vpn-instance vpn-instance-name

By default, no VPN-instance is defined.

2) Configure RD for the vpn-instance

After PE router is configured with RD, when a VPN route learned from CE is imported

into BGP, BGP attaches the RD in front of the IPv4 address. Then the general IPv4

address which may overlaps between several VPN IPv4 addresses in the VPN is

turned into a globally unique VPN IPv4 address and thus ensure the correct routing in

the VPN.

Perform the following configuration in VPN-instance view to configure RD for the

VPN-instance:

To do... Use the command...

Configure RD for the VPN-instance route-distinguisher route-distinguisher

The parameter in the above command has no default value. A VPN-instance works only

when a RD is configured for it. Other parameters for a VPN-instance cannot be

configured before configuring a RD for it.

To modify the RD, you must first delete the VPN-instance and reconfigure it.

3) Configure VPN-instance description

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Perform the following configuration in VPN-instance view to configure VPN-instance

description:

To do... Use the command...

Configure VPN-instance description description vpn-instance-description

Delete VPN-instance description

undo description

4) Configure VPN-target attribute for the VPN-instance

VPN-target attribute, a BGP extension community attribute, controls advertisement of

VPN routing information.

The following is the advertisement controlling process of VPN routing information:

z When BGP is imported into a VPN route learned at CE, it associates a VPN-target

extension community attribute list for the route. Usually the list is the VPN-instance

output routing attribute list which is associated with CE.

z VPN instance defines input routing attribute list according to the

import-extcommunity in VPN-target, defines the acceptable route range and

import it.

z VPN instance modifies VPN-target attributes for the routes to be advertised,

according to the export-extcommunity in VPN-target.

Like an RD, an extension community includes an ASN plus an arbitrary number or an IP

address plus an arbitrary number. There are two types of formats:

The first one is related to autonomous system number (ASN), in the form of 16-bit ASN

(can be 0 here): 32-bit user-defined number, for example, 100:1.

The second one is related to IP address, in the form of 32-bit IP address (can be 0.0.0.0

here):16-bit user-defined number, for example, 172.1.1.1:1.

Perform the following configuration in the VPN-instance view to create VPN-target

extended community for the VPN-instance:

To do... Use the command...

Configure VPN-target extended

community for the VPN-instance

vpn-target vpn-target-extcommunity

[ import-extcommunity |

export-extcommunity | both ]

Delete the specified VPN-target attribute

from the VPN-target attribute list

associated with the VPN-instance

undo vpn-target

vpn-target-extcommunity

[ import-extcommunity |

export-extcommunity | both ]

By default, the value is both. In general all Sites in a VPN can be interconnected, and

the import-extcommunity and export-extcommunity attributes are the same, so you

can execute the command only with the both option.

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Up to 16 VPN-targets can be configured with a command, and up to 20 vpn-targets can

be configured for a VPN-instance.

5) Limit the maximum number of routes in a VPN-instance

This command is used to limit the maximum number of routes for a VPN-instance so as

to avoid too many routes imported from a Site.

Perform the following configuration in the VPN-instance view to set the maximum

number of routes in the VPN-instance:

To do... Use the command...

Limit the maximum number of routes in

the VPN-instance

routing-table limit integer

{ alarm-integer | syslog-alert }

Remove the maximum number limitation

undo routing-table limit

Integer is in the range of 1 to 65536 and alarm-integer is in the range of 1 to 100.

 Note:

Changing the maximum route limit for VPN-instance will not affect the existing routing

table. To make the new configuration take effect immediately, you should rebuild the

corresponding routing protocol or perform shutdown/undo shutdown operation on

the corresponding interface.

6) Configure vlan-id larger than 1024 on the fast Ethernet port of Trunk type

(Optional)

Configure vlan-id larger than 1024, with the range of MPLS/VPN VLANs allowed to

pass the port from vlan-id to vlan-id + 1023

Perform the following configuration in Ethernet port view to configure the vlan-id range

of MPLS/VPN VLANs allowed:

To do... Use the command...

Configure the vlan-id range of MPLS/VPN VLANs

allowed to pass Trunk fast Ethernet ports

port trunk mpls vlan

from vlan-id [ to ] vlanid

Remove the configured vlan-id range of MPLS/VPN

VLANs allowed to pass Trunk fast Ethernet ports

undo port trunk mpls

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By default, the vlan-id range of MPLS/VPN VLANs is from 0 to 1023, and the default

value of vlan-id is 0. The value range of vlan-id is from 1 to 3071.

Caution:

z This command is only applicable to fast Ethernet ports on the cards with suffix C.

z This command can only be executed on Trunk ports, and MPLS/VPN-enabled

VLANs and VLANs out of the configured range are excluded..

z Set the VPN range for the cards and set the range of MPLS/VPN VLAN vlan-id on

the interface of the card to 1 to 4094.

Perform the following configuration in system view to configure the MPLS/VPN VLAN

vlan-id range for the card:

To do... Use the command...

Enable the 4K VPN-range for the card

vlan vpn-range slot slot-number

enable

Disable the 4K VPN-range for the card

undo vlan vpn-range slot slot-number

enable

Caution:

z This command is only applicable to fast Ethernet ports on the cards with suffix C.

z This command is actually effective for only the first 12 ports on the card. When you

configure MPLS/VPN VLAN vlan-id on subsequent ports, only the MPLS/VPN

VLAN range enabled for one VLAN will take effect. If you remove MPLS/VPN

configuration from an active port, no subsequent port will take effect automatically

either, and you have to reconfigure the ports to update their states.

z For F32GC card, 4 GE ports are initialized for 4k VLANs. Of 32 FE ports, only the

first 8 ports will take effect.

z Restart the card after issuing a command or its corresponding undo command to

ensure that the configuration takes effect.

z After you cancel card configuration, if the VLAN configured on a port exceeds 1K,

which is the default value, the configuration will be deleted automatically.

z In aggregation mode, VPN-range configuration will not be synchronized

automatically and you can manually make/remove the configuration on an individual

port.

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z Set the VPN range for the ports and set the range of MPLS/VPN VLAN vlan-id on

the ports to 1 to 4094.

Perform the following configuration in Ethernet interface view.

Table 1-2 Configure the MPLS/VPN VLAN vlan-id range for the interface

To do... Use the command...

Enable the 4K vpn-range for the

interface

port vpn-range share-mode enable

Disable the 4K vpn-range for the

interface

undo port vpn-range share-mode

enable

Caution:

z This command is only applicable to the ports on the cards with suffix C.

z Ports supporting this function stop supporting the application of ACL rules.

7) Associate interface with VPN-instance

VPN instance is associated with the direct-connect Site through interface binding.

When the packets from the Site reach the PE router though the interface bound, then

the PE can look routing information (including next hop, label, egress interface, and so

on.) up in the corresponding VPN-instance.

This command can associate a VPN-instance with an interface.

Perform the following configuration in VLAN interface view to associate interface with

VPN-instance:

To do... Use the command...

Associate interface with VPN-instance

ip binding vpn-instance

vpn-instance-name

Remove the association of the interface with

VPN-instance

undo ip binding vpn-instance

vpn-instance-name

Caution:

As executing the ip binding vpn-instance command on an interface will delete the IP

address of the interface, you must configure the IP address of the interface after

executing that command when you bind the interface with a VPN-instance.

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8) Configure an outgoing routing policy for a VPN instance

By configuring an outgoing routing policy for a VPN instance, you can set specific

extended community attributes for specific routes.

Perform the following operation in VPN instance view to configure/remove outgoing

routing policy association:

To do... Use the command...

Configure an outgoing routing policy for

the VPN instance

export route-policy route-policy-name

Remove the outgoing routing policy

applied on the VPN instance

undo export route-policy

III. Configuring PE-CE route exchanging

These route exchanging modes are available between PE and CE: static route, RIP,

OSPF, EBGP.

1) Configure static route on PE

You can configure a static route pointing to CE on PE for it to learn VPN routing

information from CE.

Perform the following configuration in the system view to create/delete static route in

VPN-instance routing table:

To do... Use the command...

Create the static

route of a specific

VPN-instance

ip route-static [ vpn-instance vpn-instance-name-list ]

ip-address { mask | mask-length } { interface-type

interface-number | vpn-instance vpn-instance-name

nexthop-ip-address } [ public ] [ preference

preference-value | tag tag-value | public ] * [ reject |

blackhole ] [ description text ]

Delete a static route

of a specific

VPN-instance

undo ip route-static vpn-instance vpn-instance-name-list

destination-ip-address { mask | mask-length }

[ interface-name | vpn-instance vpn-nexthop-name ]

nexthop-ip-address [ public ] [ preference

preference-value ]

By default, the preference value for a static route is 60. You can also specify another

preference for the static route you are configuring.

2) Configure RIP multi-instance

If you select RIP mode for CE-PE route switching, you should then specify running

environment for RIP instance on PE. With this command, you can enter RIP view and

import and advertise RIP instance in the view.

Perform the following configuration in the RIP view to configure PE-CE RIP instance:

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To do... Use the command...

Create PE-CE RIP instance

ipv4-family [ unicast ] vpn-instance

vpn-instance-name

Delete PE-CE RIP instance

undo ipv4-family [ unicast ] vpn-instance

vpn-instance-name

Then configuring RIP multi-instance to import IBGP route.

3) Configure OSPF multi-instance on PE

If you select OSPF mode for CE-PE route switching, you should then configure OSPF

multi-instance on PE. Other configurations, such as MPLS basic configuration,

VPN-instance configuration, do not change. Noted that when OSPF routes and

direct-connect routes are imported in the VPN instance address family view, BGP

routes should also be imported into OSPF. Here only introduces OSPF multi-instance

configuration in detail.

First step: Configure OSPF process.

Perform the following configuration in the system view to configure OSPF process:

To do... Use the command...

Configure an OSPF process

ospf process-id [ router-id router-id-number ]

[ vpn-instance vpn-instance-name ]

Delete an OSPF process undo ospf process-id

By default, the process index is 1.

Caution:

An OSPF process can only belong to one VPN instance, while one VPN instance may

contain multiple OSPF processes. By default, an OSPF process belongs to public

network.

Step 2: Configure Domain ID

The Domain ID is used to identify an OSPF autonomous system (AS), and the same

OSPF domain must have the same Domain ID. One process can be configured with

only one Domain ID; different processes can be configured with the same Domain ID or

different Domain IDs.

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H3C S9500 Series Operating instructions

Brand: H3C

Model: S9500 Series

Category: Networking

Type: Operating instructions

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