Users Guide

Counting ACL Hits.................................................................................................................................................... 125
Congure Ingress ACLs...................................................................................................................................................125
Congure Egress ACLs................................................................................................................................................... 126
Applying Egress Layer 3 ACLs (Control-Plane)..........................................................................................................126
Congure ACLs to Loopback...........................................................................................................................................127
Applying an ACL on Loopback Interfaces........................................................................................................................ 127
IP Prex Lists..................................................................................................................................................................128
Implementation Information...................................................................................................................................... 129
Conguration Task List for Prex Lists......................................................................................................................129
Creating a Prex List.......................................................................................................................................................129
Creating a Prex List Without a Sequence Number..................................................................................................130
Viewing Prex Lists...................................................................................................................................................130
Applying a Prex List for Route Redistribution...........................................................................................................131
Applying a Filter to a Prex List (OSPF)....................................................................................................................132
ACL Resequencing..........................................................................................................................................................132
Resequencing an ACL or Prex List.......................................................................................................................... 133
Route Maps.................................................................................................................................................................... 134
Implementation Information...................................................................................................................................... 134
Important Points to Remember.................................................................................................................................134
Conguration Task List for Route Maps.................................................................................................................... 134
Creating a Route Map...............................................................................................................................................135
Congure Route Map Filters..................................................................................................................................... 136
Conguring Match Routes........................................................................................................................................ 137
Conguring Set Conditions....................................................................................................................................... 138
Congure a Route Map for Route Redistribution...................................................................................................... 139
Congure a Route Map for Route Tagging................................................................................................................140
Continue Clause........................................................................................................................................................140
9 Bidirectional Forwarding Detection (BFD).................................................................... 141
How BFD Works.............................................................................................................................................................. 141
BFD Packet Format........................................................................................................................................................ 142
BFD Sessions..................................................................................................................................................................143
BFD Three-Way Handshake............................................................................................................................................ 144
Session State Changes................................................................................................................................................... 146
Important Points to Remember.................................................................................................................................146
Congure BFD................................................................................................................................................................ 146
Congure BFD for Physical Ports..............................................................................................................................147
Congure BFD for Static Routes.............................................................................................................................. 150
Congure BFD for OSPF........................................................................................................................................... 151
Congure BFD for IS-IS............................................................................................................................................ 154
Congure BFD for BGP.............................................................................................................................................157
Conguring Protocol Liveness...................................................................................................................................163
Troubleshooting BFD.......................................................................................................................................................163
10 Border Gateway Protocol IPv4 (BGPv4).................................................................... 165
Autonomous Systems (AS).............................................................................................................................................165
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