Administrator Guide
Establishing Sessions with OSPF Neighbors............................................................................................................. 132
Changing OSPF Session Parameters........................................................................................................................ 133
Disabling BFD for OSPF............................................................................................................................................133
Congure BFD for OSPFv3.............................................................................................................................................133
Related Conguration Tasks......................................................................................................................................134
Establishing Sessions with OSPFv3 Neighbors......................................................................................................... 134
Changing OSPFv3 Session Parameters.....................................................................................................................134
Disabling BFD for OSPFv3........................................................................................................................................ 134
Congure BFD for BGP.................................................................................................................................................. 135
Prerequisites............................................................................................................................................................. 135
Establishing Sessions with BGP Neighbors...............................................................................................................135
Disabling BFD for BGP.............................................................................................................................................. 137
Use BFD in a BGP Peer Group.................................................................................................................................. 137
Displaying BFD for BGP Information......................................................................................................................... 138
Congure BFD for VRRP................................................................................................................................................ 142
Related Conguration Tasks......................................................................................................................................142
Establishing Sessions with All VRRP Neighbors........................................................................................................ 142
Establishing VRRP Sessions on VRRP Neighbors..................................................................................................... 143
Changing VRRP Session Parameters........................................................................................................................ 143
Disabling BFD for VRRP............................................................................................................................................144
Congure BFD for VLANs...............................................................................................................................................144
Related Conguration Task....................................................................................................................................... 144
Establish Sessions with VLAN Neighbors..................................................................................................................145
Changing VLAN Session Parameters........................................................................................................................ 145
Disabling BFD for VLANs.......................................................................................................................................... 146
Congure BFD for Port-Channels................................................................................................................................... 146
Related Conguration Tasks......................................................................................................................................146
Establish Sessions on Port-Channels........................................................................................................................ 146
Changing Physical Port Session Parameters............................................................................................................. 147
Disabling BFD for Port-Channels...............................................................................................................................147
Conguring Protocol Liveness.........................................................................................................................................147
Troubleshooting BFD.......................................................................................................................................................148
9 Border Gateway Protocol IPv4 (BGPv4)...................................................................... 149
Autonomous Systems (AS)............................................................................................................................................. 149
Sessions and Peers..........................................................................................................................................................151
Establish a Session.................................................................................................................................................... 151
Route Reectors.............................................................................................................................................................152
Communities.............................................................................................................................................................153
BGP Attributes............................................................................................................................................................... 153
Best Path Selection Criteria......................................................................................................................................153
Weight......................................................................................................................................................................155
Local Preference.......................................................................................................................................................155
Multi-Exit Discriminators (MEDs)............................................................................................................................. 156
Origin........................................................................................................................................................................ 157
AS Path.....................................................................................................................................................................157
7