Concept Guide

Conguring Set Conditions......................................................................................................................................116
Congure a Route Map for Route Redistribution..................................................................................................117
Congure a Route Map for Route Tagging............................................................................................................ 117
Continue Clause........................................................................................................................................................ 118
IP Fragment Handling..................................................................................................................................................... 118
IP Fragments ACL Examples................................................................................................................................... 118
Layer 4 ACL Rules Examples................................................................................................................................... 119
Congure a Standard IP ACL.........................................................................................................................................119
Conguring a Standard IP ACL Filter..................................................................................................................... 120
Congure an Extended IP ACL......................................................................................................................................121
Conguring Filters with a Sequence Number........................................................................................................121
Conguring Filters Without a Sequence Number.................................................................................................123
Congure Layer 2 and Layer 3 ACLs............................................................................................................................123
Assign an IP ACL to an Interface..................................................................................................................................124
Applying an IP ACL.........................................................................................................................................................124
Counting ACL Hits....................................................................................................................................................125
Congure Ingress ACLs................................................................................................................................................. 125
Congure Egress ACLs.................................................................................................................................................. 126
Applying Egress Layer 3 ACLs (Control-Plane).....................................................................................................127
IP Prex Lists...................................................................................................................................................................127
Implementation Information.................................................................................................................................... 128
Conguration Task List for Prex Lists.................................................................................................................. 128
ACL Remarks................................................................................................................................................................... 131
Conguring a Remark............................................................................................................................................... 131
Deleting a Remark.................................................................................................................................................... 132
ACL Resequencing......................................................................................................................................................... 133
Resequencing an ACL or Prex List.......................................................................................................................133
Route Maps.....................................................................................................................................................................134
Implementation Information.................................................................................................................................... 134
Logging of ACL Processes............................................................................................................................................ 135
Guidelines for Conguring ACL Logging................................................................................................................136
Conguring ACL Logging.........................................................................................................................................136
Flow-Based Monitoring..................................................................................................................................................137
Behavior of Flow-Based Monitoring.......................................................................................................................137
Enabling Flow-Based Monitoring............................................................................................................................138
8 Bidirectional Forwarding Detection (BFD).................................................................................................. 140
How BFD Works............................................................................................................................................................. 140
BFD Packet Format.................................................................................................................................................. 141
BFD Sessions............................................................................................................................................................ 142
BFD Three-Way Handshake.................................................................................................................................... 143
Session State Changes............................................................................................................................................145
Important Points to Remember.................................................................................................................................... 145
Congure BFD................................................................................................................................................................ 145
Congure BFD for Physical Ports...........................................................................................................................146
Congure BFD for Static Routes............................................................................................................................147
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