Concept Guide

Important Points to Remember.................................................................................................................................... 130
Conguration Task List for Route Maps...................................................................................................................... 130
Creating a Route Map....................................................................................................................................................130
Congure Route Map Filters......................................................................................................................................... 132
Conguring Match Routes............................................................................................................................................ 132
Conguring Set Conditions........................................................................................................................................... 133
Congure a Route Map for Route Redistribution.......................................................................................................134
Congure a Route Map for Route Tagging..................................................................................................................134
Continue Clause..............................................................................................................................................................135
Logging of ACL Processes............................................................................................................................................ 135
Guidelines for Conguring ACL Logging......................................................................................................................136
Conguring ACL Logging...............................................................................................................................................136
Flow-Based Monitoring Support for ACLs.................................................................................................................. 137
Behavior of Flow-Based Monitoring.......................................................................................................................137
Enabling Flow-Based Monitoring..................................................................................................................................138
9 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
Enabling BFD Globally.............................................................................................................................................. 146
Changing Physical Port Session Parameters.........................................................................................................147
Disabling and Re-Enabling BFD...............................................................................................................................147
Congure BFD for Static Routes..................................................................................................................................148
Related Conguration Tasks....................................................................................................................................148
Establishing Sessions for Static Routes.................................................................................................................148
Establishing Static Route Sessions on Specic Neighbors................................................................................. 149
Changing Static Route Session Parameters......................................................................................................... 150
Disabling BFD for Static Routes............................................................................................................................. 150
Congure BFD for OSPF...............................................................................................................................................150
Related Conguration Tasks.....................................................................................................................................151
Establishing Sessions with OSPF Neighbors.........................................................................................................151
Establishing Sessions with OSPF Neighbors for nondefault VRFs.................................................................... 152
Changing OSPF Session Parameters.....................................................................................................................153
Disabling BFD for OSPF.......................................................................................................................................... 153
Congure BFD for OSPFv3...........................................................................................................................................153
Related Conguration Tasks....................................................................................................................................154
Establishing Sessions with OSPFv3 Neighbors....................................................................................................154
Establishing BFD Sessions with OSPFv3 Neighbors for nondefault VRFs....................................................... 154
Changing OSPFv3 Session Parameters................................................................................................................ 155
Disabling BFD for OSPFv3...................................................................................................................................... 156
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