Conguring Set Conditions......................................................................................................................................115
Congure a Route Map for Route Redistribution..................................................................................................116
Congure a Route Map for Route Tagging............................................................................................................ 117
Continue Clause.........................................................................................................................................................117
IP Fragment Handling..................................................................................................................................................... 118
IP Fragments ACL Examples................................................................................................................................... 118
Layer 4 ACL Rules Examples................................................................................................................................... 118
Congure a Standard IP ACL.........................................................................................................................................119
Conguring a Standard IP ACL Filter..................................................................................................................... 120
Congure an Extended IP ACL......................................................................................................................................121
Conguring Filters with a Sequence Number........................................................................................................121
Conguring Filters Without a Sequence Number.................................................................................................122
Congure Layer 2 and Layer 3 ACLs............................................................................................................................123
Assign an IP ACL to an Interface.................................................................................................................................. 124
Applying an IP ACL.........................................................................................................................................................124
Counting ACL Hits....................................................................................................................................................125
Congure Ingress ACLs................................................................................................................................................. 125
Congure Egress ACLs..................................................................................................................................................125
Applying Egress Layer 3 ACLs (Control-Plane).................................................................................................... 126
IP Prex Lists...................................................................................................................................................................127
Implementation Information.....................................................................................................................................127
Conguration Task List for Prex Lists.................................................................................................................. 127
ACL Resequencing.......................................................................................................................................................... 131
Resequencing an ACL or Prex List........................................................................................................................131
Route Maps.....................................................................................................................................................................133
Implementation Information.................................................................................................................................... 133
Logging of ACL Processes............................................................................................................................................ 133
Guidelines for Conguring ACL Logging................................................................................................................134
Conguring ACL Logging.........................................................................................................................................134
Flow-Based Monitoring..................................................................................................................................................135
Behavior of Flow-Based Monitoring.......................................................................................................................135
Enabling Flow-Based Monitoring............................................................................................................................ 137
8 Bidirectional Forwarding Detection (BFD).................................................................................................. 139
How BFD Works............................................................................................................................................................. 139
BFD Packet Format..................................................................................................................................................140
BFD Sessions............................................................................................................................................................. 141
BFD Three-Way Handshake.................................................................................................................................... 142
Session State Changes............................................................................................................................................144
Important Points to Remember.................................................................................................................................... 144
Congure BFD................................................................................................................................................................ 144
Congure BFD for Physical Ports...........................................................................................................................145
Congure BFD for Static Routes............................................................................................................................146
Congure BFD for OSPF.........................................................................................................................................149
Congure BFD for OSPFv3.....................................................................................................................................152
Congure BFD for IS-IS...........................................................................................................................................155
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