Concept Guide

Table Of Contents
Important Points to Remember.................................................................................................................................... 129
Conguration Task List for Route Maps...................................................................................................................... 129
Creating a Route Map....................................................................................................................................................129
Congure Route Map Filters..........................................................................................................................................131
Conguring Match Routes.............................................................................................................................................131
Conguring Set Conditions........................................................................................................................................... 132
Congure a Route Map for Route Redistribution.......................................................................................................133
Congure a Route Map for Route Tagging..................................................................................................................133
Continue Clause..............................................................................................................................................................134
Logging of ACL Processes............................................................................................................................................ 134
Guidelines for Conguring ACL Logging......................................................................................................................135
Conguring ACL Logging.............................................................................................................................................. 135
Flow-Based Monitoring Support for ACLs.................................................................................................................. 136
Behavior of Flow-Based Monitoring.......................................................................................................................136
Enabling Flow-Based Monitoring.................................................................................................................................. 137
9 Bidirectional Forwarding Detection (BFD).................................................................................................. 139
How BFD Works............................................................................................................................................................. 139
BFD Packet Format..................................................................................................................................................140
BFD Sessions............................................................................................................................................................. 141
BFD Three-Way Handshake.................................................................................................................................... 142
Session State Changes............................................................................................................................................144
Important Points to Remember.................................................................................................................................... 144
Congure BFD................................................................................................................................................................ 144
Congure BFD for Physical Ports...........................................................................................................................145
Enabling BFD Globally.............................................................................................................................................. 145
Changing Physical Port Session Parameters........................................................................................................ 146
Disabling and Re-Enabling BFD.............................................................................................................................. 146
Congure BFD for Static Routes..................................................................................................................................147
Related Conguration Tasks....................................................................................................................................147
Establishing Sessions for Static Routes.................................................................................................................147
Establishing Static Route Sessions on Specic Neighbors................................................................................. 148
Changing Static Route Session Parameters......................................................................................................... 149
Disabling BFD for Static Routes............................................................................................................................. 149
Congure BFD for OSPF...............................................................................................................................................149
Related Conguration Tasks....................................................................................................................................150
Establishing Sessions with OSPF Neighbors........................................................................................................150
Establishing Sessions with OSPF Neighbors for nondefault VRFs.....................................................................151
Changing OSPF Session Parameters.....................................................................................................................152
Disabling BFD for OSPF...........................................................................................................................................152
Congure BFD for OSPFv3...........................................................................................................................................152
Related Conguration Tasks....................................................................................................................................153
Establishing Sessions with OSPFv3 Neighbors....................................................................................................153
Establishing BFD Sessions with OSPFv3 Neighbors for nondefault VRFs....................................................... 153
Changing OSPFv3 Session Parameters.................................................................................................................154
Disabling BFD for OSPFv3...................................................................................................................................... 155
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