Administrator Guide

User-Congurable CAM Allocation......................................................................................................................... 114
Allocating CAM for Ingress ACLs on the Port Extender...................................................................................... 114
Allocating CAM for Egress ACLs on the Port Extender....................................................................................... 116
Implementing ACLs .................................................................................................................................................. 117
IP Fragment Handling..................................................................................................................................................... 118
IP Fragments ACL Examples................................................................................................................................... 118
Layer 4 ACL Rules Examples................................................................................................................................... 119
Congure a Standard IP ACL........................................................................................................................................120
Conguring a Standard IP ACL Filter......................................................................................................................121
Congure an Extended IP ACL......................................................................................................................................121
Conguring Filters with a Sequence Number....................................................................................................... 122
Conguring Filters Without a Sequence Number.................................................................................................123
Congure Layer 2 and Layer 3 ACLs............................................................................................................................123
Using ACL VLAN Groups...............................................................................................................................................124
Guidelines for Conguring ACL VLAN Groups......................................................................................................124
Conguring an ACL VLAN Group...........................................................................................................................125
Allocating ACL VLAN CAM..................................................................................................................................... 126
Applying an IP ACL to an Interface.............................................................................................................................. 126
Applying Ingress ACLs on the Port Extender........................................................................................................ 127
Applying Egress ACLs.............................................................................................................................................. 128
Applying Layer 3 Egress ACLs on Control-Plane Trac...................................................................................... 128
Counting ACL Hits....................................................................................................................................................129
IP Prex Lists.................................................................................................................................................................. 129
Implementation Information.................................................................................................................................... 129
Conguration Task List for Prex Lists.................................................................................................................. 130
ACL Resequencing......................................................................................................................................................... 133
Resequencing an ACL or Prex List.......................................................................................................................134
Route Maps.....................................................................................................................................................................135
Implementation Information.................................................................................................................................... 135
Important Points to Remember.................................................................................................................................... 135
Conguration Task List for Route Maps................................................................................................................ 135
Conguring Match Routes...................................................................................................................................... 138
Conguring Set Conditions..................................................................................................................................... 139
Congure a Route Map for Route Redistribution.................................................................................................140
Congure a Route Map for Route Tagging........................................................................................................... 140
Continue Clause........................................................................................................................................................ 141
Conguring a UDF ACL.................................................................................................................................................. 141
Hot-Lock Behavior......................................................................................................................................................... 143
7 Bidirectional Forwarding Detection (BFD).................................................................................................. 144
How BFD Works............................................................................................................................................................. 144
BFD Packet Format..................................................................................................................................................145
BFD Sessions............................................................................................................................................................ 146
BFD Three-Way Handshake.................................................................................................................................... 147
Session State Changes............................................................................................................................................149
Important Points to Remember.................................................................................................................................... 149
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