Owners Manual

Important Points to Remember........................................................................................................142
Configuration Task List for Route Maps..................................................................................... 142
Configuring Match Routes..........................................................................................................144
Configuring Set Conditions........................................................................................................ 146
Configure a Route Map for Route Redistribution...................................................................... 147
Configure a Route Map for Route Tagging................................................................................ 147
Continue Clause..........................................................................................................................148
Logging of ACL Processes................................................................................................................148
Guidelines for Configuring ACL Logging................................................................................... 149
Configuring ACL Logging........................................................................................................... 150
Flow-Based Monitoring Support for ACLs........................................................................................151
Behavior of Flow-Based Monitoring........................................................................................... 151
Enabling Flow-Based Monitoring............................................................................................... 152
9 Bidirectional Forwarding Detection (BFD)...................................................154
How BFD Works................................................................................................................................ 154
BFD Packet Format......................................................................................................................155
BFD Sessions................................................................................................................................157
BFD Three-Way Handshake........................................................................................................ 157
Session State Changes................................................................................................................ 158
Important Points to Remember........................................................................................................159
Configure BFD...................................................................................................................................159
Configure BFD for Physical Ports............................................................................................... 160
Configure BFD for Static Routes.................................................................................................163
Configure BFD for OSPF............................................................................................................. 165
Configure BFD for OSPFv3......................................................................................................... 168
Configure BFD for IS-IS...............................................................................................................169
Configure BFD for BGP............................................................................................................... 172
Configure BFD for VRRP..............................................................................................................179
Configuring Protocol Liveness................................................................................................... 182
Troubleshooting BFD.................................................................................................................. 182
10 Border Gateway Protocol IPv4 (BGPv4).................................................... 184
Autonomous Systems (AS)................................................................................................................184
Sessions and Peers............................................................................................................................186
Establish a Session.......................................................................................................................187
Route Reflectors................................................................................................................................187
BGP Attributes...................................................................................................................................188
Best Path Selection Criteria........................................................................................................ 189
Weight.......................................................................................................................................... 191
Local Preference..........................................................................................................................191
Multi-Exit Discriminators (MEDs)................................................................................................ 192