Administrator Guide

Congure a Route Map for Route Redistribution..................................................................................................115
Congure a Route Map for Route Tagging............................................................................................................ 116
Continue Clause........................................................................................................................................................ 116
IP Fragment Handling..................................................................................................................................................... 117
IP Fragments ACL Examples....................................................................................................................................117
Layer 4 ACL Rules Examples....................................................................................................................................117
Congure a Standard IP ACL.........................................................................................................................................118
Conguring a Standard IP ACL Filter......................................................................................................................119
Congure an Extended IP ACL.....................................................................................................................................120
Conguring Filters with a Sequence Number.......................................................................................................120
Conguring Filters Without a Sequence Number................................................................................................. 121
Congure Layer 2 and Layer 3 ACLs............................................................................................................................122
Assign an IP ACL to an Interface..................................................................................................................................123
Applying an IP ACL.........................................................................................................................................................123
Counting ACL Hits....................................................................................................................................................124
Congure Ingress ACLs................................................................................................................................................. 124
Congure Egress ACLs.................................................................................................................................................. 124
Applying Egress Layer 3 ACLs (Control-Plane).................................................................................................... 125
IP Prex Lists.................................................................................................................................................................. 126
Implementation Information.................................................................................................................................... 126
Conguration Task List for Prex Lists.................................................................................................................. 126
ACL Resequencing......................................................................................................................................................... 130
Resequencing an ACL or Prex List.......................................................................................................................130
Route Maps.....................................................................................................................................................................132
Implementation Information.................................................................................................................................... 132
Logging of ACL Processes............................................................................................................................................ 132
Guidelines for Conguring ACL Logging................................................................................................................133
Conguring ACL Logging.........................................................................................................................................133
Flow-Based Monitoring Support for ACLs.................................................................................................................. 134
Behavior of Flow-Based Monitoring.......................................................................................................................134
Enabling Flow-Based Monitoring............................................................................................................................135
8 Bidirectional Forwarding Detection (BFD)...................................................................................................137
How BFD Works..............................................................................................................................................................137
BFD Packet Format..................................................................................................................................................138
BFD Sessions............................................................................................................................................................ 139
BFD Three-Way Handshake.................................................................................................................................... 140
Session State Changes............................................................................................................................................142
Important Points to Remember.................................................................................................................................... 142
Congure BFD................................................................................................................................................................ 142
Congure BFD for Physical Ports...........................................................................................................................143
Congure BFD for Static Routes............................................................................................................................144
Congure BFD for OSPF......................................................................................................................................... 147
Congure BFD for OSPFv3.....................................................................................................................................152
Congure BFD for IS-IS...........................................................................................................................................155
Congure BFD for BGP...........................................................................................................................................158
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