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Table Of Contents
Configuring a Standard IP ACL Filter....................................................................................................................109
Configure an Extended IP ACL..................................................................................................................................... 110
Configuring Filters with a Sequence Number......................................................................................................110
Configuring Filters Without a Sequence Number............................................................................................... 110
Established Flag.................................................................................................................................................................111
Configure Layer 2 and Layer 3 ACLs............................................................................................................................111
Assign an IP ACL to an Interface..................................................................................................................................112
Applying an IP ACL..................................................................................................................................................... 112
Counting ACL Hits......................................................................................................................................................113
Configure Ingress ACLs.................................................................................................................................................. 113
Configure Egress ACLs................................................................................................................................................... 113
Applying Egress Layer 3 ACLs (Control-Plane).................................................................................................. 114
Configure ACLs to Loopback.........................................................................................................................................114
Applying an ACL on Loopback Interfaces...................................................................................................................115
IP Prefix Lists.................................................................................................................................................................... 115
Configuration Task List for Prefix Lists................................................................................................................ 116
Creating a Prefix List.......................................................................................................................................................116
Creating a Prefix List Without a Sequence Number.......................................................................................... 117
Viewing Prefix Lists....................................................................................................................................................117
Applying a Prefix List for Route Redistribution................................................................................................... 118
Applying a Filter to a Prefix List (OSPF).............................................................................................................. 119
ACL Resequencing........................................................................................................................................................... 119
Resequencing an ACL or Prefix List......................................................................................................................120
Route Maps........................................................................................................................................................................121
Important Points to Remember...............................................................................................................................121
Configuration Task List for Route Maps...............................................................................................................121
Creating a Route Map............................................................................................................................................... 121
Configure Route Map Filters...................................................................................................................................122
Configuring Match Routes.......................................................................................................................................123
Configuring Set Conditions......................................................................................................................................124
Configure a Route Map for Route Redistribution.............................................................................................. 125
Configure a Route Map for Route Tagging......................................................................................................... 126
Continue Clause......................................................................................................................................................... 126
Chapter 8: Bidirectional Forwarding Detection (BFD).................................................................127
How BFD Works............................................................................................................................................................... 127
BFD Packet Format.........................................................................................................................................................128
BFD Sessions.................................................................................................................................................................... 129
BFD Three-Way Handshake..........................................................................................................................................130
Session State Changes................................................................................................................................................... 131
Important Points to Remember...............................................................................................................................131
Configure BFD...................................................................................................................................................................131
Configure BFD for Physical Ports..........................................................................................................................132
Configure BFD for Static Routes........................................................................................................................... 133
Configure BFD for IPv6 Static Routes..................................................................................................................137
Configure BFD for OSPF......................................................................................................................................... 139
Configure BFD for OSPFv3..................................................................................................................................... 143
Configure BFD for IS-IS........................................................................................................................................... 145
Configure BFD for BGP............................................................................................................................................ 147
Configuring Protocol Liveness................................................................................................................................154
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