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Flow-Based Monitoring Support for ACLs....................................................................................... 138
Behavior of Flow-Based Monitoring...........................................................................................138
Enabling Flow-Based Monitoring.....................................................................................................140
8 Bidirectional Forwarding Detection (BFD).................................................. 142
How BFD Works................................................................................................................................ 142
BFD Packet Format......................................................................................................................143
BFD Sessions................................................................................................................................145
BFD Three-Way Handshake........................................................................................................145
Session State Changes................................................................................................................146
Important Points to Remember........................................................................................................147
Configure BFD...................................................................................................................................148
Configure BFD for Physical Ports............................................................................................... 148
Enabling BFD Globally.................................................................................................................148
Establishing a Session on Physical Ports.................................................................................... 149
Changing Physical Port Session Parameters..............................................................................150
Disabling and Re-Enabling BFD.................................................................................................. 151
Configure BFD for Static Routes.......................................................................................................152
Related Configuration Tasks....................................................................................................... 152
Establishing Sessions for Static Routes.......................................................................................152
Changing Static Route Session Parameters............................................................................... 153
Disabling BFD for Static Routes.................................................................................................. 153
Configure BFD for OSPF................................................................................................................... 154
Related Configuration Tasks.......................................................................................................154
Establishing Sessions with OSPF Neighbors...............................................................................155
Changing OSPF Session Parameters.......................................................................................... 156
Disabling BFD for OSPF............................................................................................................... 157
Configure BFD for OSPFv3................................................................................................................157
Related Configuration Tasks....................................................................................................... 157
Establishing Sessions with OSPFv3 Neighbors........................................................................... 157
Changing OSPFv3 Session Parameters...................................................................................... 158
Disabling BFD for OSPFv3...........................................................................................................158
Configure BFD for BGP.....................................................................................................................159
Prerequisites................................................................................................................................ 159
Establishing Sessions with BGP Neighbors................................................................................ 159
Disabling BFD for BGP.................................................................................................................161
Use BFD in a BGP Peer Group.................................................................................................... 162
Displaying BFD for BGP Information.......................................................................................... 162
Configure BFD for VRRP...................................................................................................................166
Related Configuration Tasks....................................................................................................... 167
Establishing Sessions with All VRRP Neighbors..........................................................................167
Establishing VRRP Sessions on VRRP Neighbors....................................................................... 167
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