Setup Guide

Conguring Set Conditions..................................................................................................................................... 120
Congure a Route Map for Route Redistribution..................................................................................................121
Congure a Route Map for Route Tagging............................................................................................................ 121
Continue Clause........................................................................................................................................................122
IP Fragment Handling.................................................................................................................................................... 122
IP Fragments ACL Examples...................................................................................................................................122
Layer 4 ACL Rules Examples...................................................................................................................................123
Congure a Standard IP ACL........................................................................................................................................ 124
Conguring a Standard IP ACL Filter..................................................................................................................... 125
Congure an Extended IP ACL..................................................................................................................................... 125
Conguring Filters with a Sequence Number....................................................................................................... 126
Conguring Filters Without a Sequence Number.................................................................................................129
Congure Layer 2 and Layer 3 ACLs............................................................................................................................130
Assign an IP ACL to an Interface..................................................................................................................................130
Applying an IP ACL..........................................................................................................................................................131
Counting ACL Hits.....................................................................................................................................................131
Congure Ingress ACLs................................................................................................................................................. 132
Congure Egress ACLs.................................................................................................................................................. 132
Applying Egress Layer 3 ACLs (Control-Plane).................................................................................................... 133
Conguring UDF ACL.....................................................................................................................................................134
IP Prex Lists...................................................................................................................................................................137
Implementation Information.................................................................................................................................... 138
Conguration Task List for Prex Lists.................................................................................................................. 138
ACL Resequencing..........................................................................................................................................................141
Resequencing an ACL or Prex List.......................................................................................................................142
Route Maps.....................................................................................................................................................................143
Implementation Information.................................................................................................................................... 143
8 Bidirectional Forwarding Detection (BFD).................................................................................................. 144
How BFD Works............................................................................................................................................................. 144
BFD Packet Format..................................................................................................................................................145
BFD Sessions............................................................................................................................................................ 146
BFD Three-Way Handshake.................................................................................................................................... 147
Session State Changes............................................................................................................................................149
Important Points to Remember.................................................................................................................................... 149
Congure BFD................................................................................................................................................................ 150
Congure BFD for Physical Ports.......................................................................................................................... 150
Congure BFD for Static Routes............................................................................................................................152
Congure BFD for OSPF.........................................................................................................................................154
Congure BFD for OSPFv3.....................................................................................................................................159
Congure BFD for IS-IS...........................................................................................................................................162
Congure BFD for BGP...........................................................................................................................................165
Congure BFD for VRRP..........................................................................................................................................171
Conguring Protocol Liveness.................................................................................................................................174
Troubleshooting BFD................................................................................................................................................ 174
6
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