Reference Guide

Configuring a Standard IP ACL Filter..............................................................................................................102
Configure an Extended IP ACL..............................................................................................................................103
Configuring Filters with a Sequence Number................................................................................................ 103
Configuring Filters Without a Sequence Number.......................................................................................... 105
Configure Layer 2 and Layer 3 ACLs.....................................................................................................................105
Assign an IP ACL to an Interface..........................................................................................................................106
Applying an IP ACL............................................................................................................................................... 106
Counting ACL Hits...........................................................................................................................................107
Configure Ingress ACLs........................................................................................................................................ 107
Configure Egress ACLs......................................................................................................................................... 108
Applying Egress Layer 3 ACLs (Control-Plane).............................................................................................. 109
IP Prefix Lists........................................................................................................................................................ 109
Implementation Information...........................................................................................................................110
Configuration Task List for Prefix Lists...........................................................................................................110
ACL Resequencing................................................................................................................................................113
Resequencing an ACL or Prefix List...............................................................................................................114
Route Maps...........................................................................................................................................................115
Implementation Information...........................................................................................................................115
Important Points to Remember.............................................................................................................................115
Configuration Task List for Route Maps.........................................................................................................116
Configuring Match Routes............................................................................................................................. 118
Configuring Set Conditions.............................................................................................................................119
Configure a Route Map for Route Redistribution........................................................................................... 120
Configure a Route Map for Route Tagging.....................................................................................................121
Continue Clause............................................................................................................................................. 121
8 Bidirectional Forwarding Detection (BFD)..........................................................................123
How BFD Works....................................................................................................................................................123
BFD Packet Format.........................................................................................................................................124
BFD Sessions................................................................................................................................................. 125
BFD Three-Way Handshake...........................................................................................................................126
Session State Changes.................................................................................................................................. 128
Important Points to Remember.............................................................................................................................128
Configure BFD.......................................................................................................................................................129
Configure BFD for Physical Ports...................................................................................................................129
Configure BFD for Static Routes.................................................................................................................... 132
Configure BFD for OSPF................................................................................................................................. 134
Configure BFD for OSPFv3..............................................................................................................................137
Configure BFD for IS-IS..................................................................................................................................138
Configure BFD for BGP...................................................................................................................................140
Configure BFD for VRRP.................................................................................................................................147
Configuring Protocol Liveness....................................................................................................................... 150