Conguration Task List for Prex Lists............................................................................................................................104
Creating a Prex List...................................................................................................................................................... 105
Creating a Prex List Without a Sequence Number........................................................................................................105
Viewing Prex Lists.........................................................................................................................................................106
Applying a Prex List for Route Redistribution................................................................................................................ 107
Applying a Filter to a Prex List (OSPF)..........................................................................................................................107
ACL Resequencing..........................................................................................................................................................108
Resequencing an ACL or Prex List................................................................................................................................ 108
Route Maps.....................................................................................................................................................................110
Implementation Information.......................................................................................................................................110
Important Points to Remember....................................................................................................................................... 110
Conguration Task List for Route Maps...........................................................................................................................110
Creating a Route Map......................................................................................................................................................110
Congure Route Map Filters............................................................................................................................................112
Conguring Match Routes...............................................................................................................................................112
Conguring Set Conditions..............................................................................................................................................113
Congure a Route Map for Route Redistribution............................................................................................................. 114
Congure a Route Map for Route Tagging.......................................................................................................................114
Continue Clause.............................................................................................................................................................. 115
Logging of ACL Processes...............................................................................................................................................115
Guidelines for Conguring ACL Logging...........................................................................................................................116
Conguring ACL Logging.................................................................................................................................................116
Flow-Based Monitoring Support for ACLs....................................................................................................................... 117
Behavior of Flow-Based Monitoring...........................................................................................................................117
Enabling Flow-Based Monitoring..................................................................................................................................... 119
8 Bidirectional Forwarding Detection (BFD)....................................................................120
How BFD Works............................................................................................................................................................. 120
BFD Packet Format................................................................................................................................................... 121
BFD Sessions............................................................................................................................................................122
BFD Three-Way Handshake...................................................................................................................................... 123
Session State Changes............................................................................................................................................. 125
Important Points to Remember.......................................................................................................................................125
Congure BFD................................................................................................................................................................ 125
Congure BFD for Physical Ports..............................................................................................................................126
Enabling BFD Globally............................................................................................................................................... 126
Establishing a Session on Physical Ports................................................................................................................... 127
Changing Physical Port Session Parameters............................................................................................................. 128
Disabling and Re-Enabling BFD.................................................................................................................................129
Congure BFD for Static Routes.....................................................................................................................................129
Related Conguration Tasks......................................................................................................................................129
Establishing Sessions for Static Routes.....................................................................................................................130
Changing Static Route Session Parameters.............................................................................................................. 130
Disabling BFD for Static Routes.................................................................................................................................131
Congure BFD for OSPF................................................................................................................................................. 131
Related Conguration Tasks.......................................................................................................................................131
6