Reference Guide

Important Points to Remember........................................................................................................139
Configuration Task List for Route Maps..................................................................................... 139
Configuring Match Routes.......................................................................................................... 141
Configuring Set Conditions........................................................................................................ 143
Configure a Route Map for Route Redistribution...................................................................... 144
Configure a Route Map for Route Tagging................................................................................145
Continue Clause..........................................................................................................................145
Logging of ACL Processes................................................................................................................ 145
Guidelines for Configuring ACL Logging................................................................................... 146
Configuring ACL Logging............................................................................................................147
Flow-Based Monitoring Support for ACLs.......................................................................................148
Behavior of Flow-Based Monitoring.......................................................................................... 148
Enabling Flow-Based Monitoring............................................................................................... 150
9 Bidirectional Forwarding Detection (BFD).....................................................152
How BFD Works................................................................................................................................ 152
BFD Packet Format......................................................................................................................153
BFD Sessions................................................................................................................................155
BFD Three-Way Handshake........................................................................................................155
Session State Changes................................................................................................................ 156
Important Points to Remember........................................................................................................157
Configure BFD................................................................................................................................... 157
Configure BFD for Physical Ports............................................................................................... 158
Configure BFD for Static Routes................................................................................................. 161
Configure BFD for OSPF............................................................................................................. 163
Configure BFD for OSPFv3......................................................................................................... 166
Configure BFD for IS-IS...............................................................................................................167
Configure BFD for BGP............................................................................................................... 170
Configure BFD for VRRP..............................................................................................................177
Configuring Protocol Liveness................................................................................................... 180
Troubleshooting BFD..................................................................................................................180
10 Border Gateway Protocol IPv4 (BGPv4)....................................................... 182
Autonomous Systems (AS)................................................................................................................182
Sessions and Peers............................................................................................................................184
Establish a Session.......................................................................................................................185
Route Reflectors................................................................................................................................185
BGP Attributes................................................................................................................................... 186
Best Path Selection Criteria.........................................................................................................187
Weight..........................................................................................................................................189
Local Preference......................................................................................................................... 189
Multi-Exit Discriminators (MEDs)................................................................................................190