Applying an IP ACL......................................................................................................................................................... 103
Counting ACL Hits.......................................................................................................................................................... 104
Congure Ingress ACLs...................................................................................................................................................104
Congure Egress ACLs...................................................................................................................................................105
Applying Egress Layer 3 ACLs (Control-Plane)............................................................................................................... 105
IP Prex Lists..................................................................................................................................................................106
Implementation Information...................................................................................................................................... 106
Conguration Task List for Prex Lists............................................................................................................................106
Creating a Prex List.......................................................................................................................................................107
Creating a Prex List Without a Sequence Number........................................................................................................ 107
Viewing Prex Lists.........................................................................................................................................................108
Applying a Prex List for Route Redistribution................................................................................................................109
Applying a Filter to a Prex List (OSPF)..........................................................................................................................109
ACL Resequencing.......................................................................................................................................................... 110
Resequencing an ACL or Prex List.................................................................................................................................110
Route Maps..................................................................................................................................................................... 112
Implementation Information....................................................................................................................................... 112
Important Points to Remember........................................................................................................................................112
Conguration Task List for Route Maps...........................................................................................................................112
Creating a Route Map......................................................................................................................................................112
Congure Route Map Filters............................................................................................................................................114
Conguring Match Routes...............................................................................................................................................114
Conguring Set Conditions..............................................................................................................................................115
Congure a Route Map for Route Redistribution............................................................................................................. 116
Congure a Route Map for Route Tagging.......................................................................................................................116
Continue Clause...............................................................................................................................................................117
Logging of ACL Processes............................................................................................................................................... 117
Guidelines for Conguring ACL Logging...........................................................................................................................118
Conguring ACL Logging.................................................................................................................................................118
Flow-Based Monitoring Support for ACLs....................................................................................................................... 119
Behavior of Flow-Based Monitoring...........................................................................................................................119
Enabling Flow-Based Monitoring..................................................................................................................................... 121
8 Bidirectional Forwarding Detection (BFD)....................................................................122
How BFD Works............................................................................................................................................................. 122
BFD Packet Format.................................................................................................................................................. 123
BFD Sessions............................................................................................................................................................124
BFD Three-Way Handshake...................................................................................................................................... 125
Session State Changes............................................................................................................................................. 127
Important Points to Remember....................................................................................................................................... 127
Congure BFD................................................................................................................................................................ 127
Congure BFD for Physical Ports..............................................................................................................................128
Enabling BFD Globally............................................................................................................................................... 128
Establishing a Session on Physical Ports...................................................................................................................129
Changing Physical Port Session Parameters.............................................................................................................130
Disabling and Re-Enabling BFD..................................................................................................................................131
6