Example of Viewing Session ParametersR1(conf-if-te-4/24)#bfd interval 100 min_rx 100 multiplier 4 role passiveR1(conf-if-te-4/24)#do show bfd neighbors detailSession Discriminator: 1Neighbor Discriminator: 1Local Addr: 2.2.2.1Local MAC Addr: 00:01:e8:09:c3:e5Remote Addr: 2.2.2.2Remote MAC Addr: 00:01:e8:06:95:a2Int: TenGigabitEthernet 4/24State: UpConfigured parameters:TX: 100ms, RX: 100ms, Multiplier: 4Neighbor parameters:TX: 100ms, RX: 100ms, Multiplier: 3Actual parameters:TX: 100ms, RX: 100ms, Multiplier: 4Role: PassiveDelete session on Down: FalseClient Registered: CLIUptime: 00:09:06Statistics:Number of packets received from neighbor: 4092Number of packets sent to neighbor: 4093Number of state changes: 1Number of messages from IFA about port state change: 0Number of messages communicated b/w Manager and Agent: 7Disabling and Re-Enabling BFDBFD is enabled on all interfaces by default, though sessions are not created unless explicitly configured.If you disable BFD, all of the sessions on that interface are placed in an Administratively Down state ( the first message example), and theremote systems are notified of the session state change (the second message example).To disable and re-enable BFD on an interface, use the following commands.• Disable BFD on an interface.INTERFACE modeno bfd enable• Enable BFD on an interface.INTERFACE modebfd enableIf you disable BFD on a local interface, this message displays:R1(conf-if-te-4/24)#01:00:52: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed sessionstate to AdDn for neighbor 2.2.2.2 on interface Te 4/24 (diag: 0)If the remote system state changes due to the local state administration being down, this message displays:R2>01:32:53: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Down forneighbor2.2.2.1 on interface Te 2/1 (diag: 7)Configure BFD for Static RoutesBFD offers systems a link state detection mechanism for static routes. With BFD, systems are notified to remove static routes from therouting table as soon as the link state change occurs, rather than waiting until packets fail to reach their next hop.Bidirectional Forwarding Detection (BFD) 151
