Users Guide

Conguring Filters Without a Sequence Number................................................................................................ 109
Congure Layer 2 and Layer 3 ACLs............................................................................................................................ 110
Assign an IP ACL to an Interface...................................................................................................................................110
Applying an IP ACL.......................................................................................................................................................... 111
Counting ACL Hits..................................................................................................................................................... 111
Congure Ingress ACLs.................................................................................................................................................. 112
Congure Egress ACLs...................................................................................................................................................112
Applying Egress Layer 3 ACLs (Control-Plane)..................................................................................................... 113
IP Prex Lists................................................................................................................................................................... 113
Implementation Information..................................................................................................................................... 114
Conguration Task List for Prex Lists...................................................................................................................114
ACL Resequencing.......................................................................................................................................................... 117
Resequencing an ACL or Prex List........................................................................................................................118
Route Maps......................................................................................................................................................................119
Implementation Information..................................................................................................................................... 119
Important Points to Remember.....................................................................................................................................119
Conguration Task List for Route Maps................................................................................................................ 120
Conguring Match Routes...................................................................................................................................... 122
Conguring Set Conditions..................................................................................................................................... 123
Congure a Route Map for Route Redistribution.................................................................................................124
Congure a Route Map for Route Tagging............................................................................................................124
Continue Clause........................................................................................................................................................125
Logging of ACL Processes............................................................................................................................................ 125
Guidelines for Conguring ACL Logging................................................................................................................126
Conguring ACL Logging.........................................................................................................................................126
Flow-Based Monitoring Support for ACLs.................................................................................................................. 127
Behavior of Flow-Based Monitoring.......................................................................................................................127
Enabling Flow-Based Monitoring............................................................................................................................128
8 Bidirectional Forwarding Detection (BFD).................................................................................................. 130
How BFD Works............................................................................................................................................................. 130
BFD Packet Format...................................................................................................................................................131
BFD Sessions............................................................................................................................................................ 132
BFD Three-Way Handshake.................................................................................................................................... 133
Session State Changes............................................................................................................................................135
Important Points to Remember.................................................................................................................................... 135
Congure BFD................................................................................................................................................................ 135
Congure BFD for Physical Ports...........................................................................................................................136
Congure BFD for Static Routes............................................................................................................................139
Congure BFD for OSPF..........................................................................................................................................141
Congure BFD for OSPFv3.....................................................................................................................................143
Congure BFD for IS-IS...........................................................................................................................................145
Congure BFD for BGP........................................................................................................................................... 147
Congure BFD for VRRP.........................................................................................................................................154
Conguring Protocol Liveness................................................................................................................................156
Troubleshooting BFD................................................................................................................................................156
6
Contents