Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide ...

5BFDThe following example shows the output from a session with debug bfd timer, debug bfd ipc-event,and debug bfd pbif enabled.Brocade# debug bfd timerBFD: timer debugging is onBrocade# debug bfd pbifBFD: pbif debugging is onBrocade# debug bfd ipc-eventBFD: ipc-event debugging is onFeb 11 07:52:41 BFD: Timer called at interval of 46 msFeb 11 07:52:41 BFD: Timer called at interval of 17 msFeb 11 07:52:41 BFD: Negotiated TX Interval 1000000 microsec, Jittered Transmit Interval 822 ms, random num 1572Feb 11 07:52:41 BFD: Tx PBIF Assist disabled for session 1Feb 11 07:52:41 BFD: send IPC to MP for Use PBIF Assist change to N for session 1Feb 11 07:52:41 BFD: ipc session state change to MP, for session 1Feb 11 07:52:41 BFD: ipc session parameters change to MP, for session 1Feb 11 07:52:42 BFD: Timer called at interval of 56 msFeb 11 07:52:42 BFD/IPC: Received set session admin down for session=1Feb 11 07:52:42 BFD: ipc session parameters change to MP, for session 1Feb 11 07:52:42 BFD/IPC: Received delete session for session=1Feb 11 07:52:42 BFD: Timer called at interval of 19 msFeb 11 07:52:50 BFD/IPC: Received create session for session=4Feb 11 07:52:50 BFD: Negotiated TX Interval 1000000 microsec, Jittered Transmit Interval 827 ms, random num 3827Feb 11 07:52:50 BFD: ipc session parameters change to MP, for session 4Feb 11 07:52:50 BFD: ipc session state change to MP, for session 4Feb 11 07:52:50 BFD: ipc session parameters change to MP, for session 4Feb 11 07:52:50 BFD: PBIF TX Assist Request successful for session 4 with interval 20675 ms handle 1a480140Feb 11 07:52:50 BFD: send IPC to MP for Use PBIF Assist change to Y for session 4Feb 11 07:52:50 BFD: Negotiated TX Interval 50000 microsec, Jittered TransmitInterval 40 ms, random num 10731Feb 11 07:52:50 BFD: Tx PBIF Assist disabled for session 4Feb 11 07:52:50 BFD: send IPC to MP for Use PBIF Assist change to N for session 4Feb 11 07:52:50 BFD: PBIF TX Assist Request successful for session 4 with interval 1000 ms handle 1a480140Feb 11 07:52:50 BFD: send IPC to MP for Use PBIF Assist change to Y for session 4Feb 11 07:52:50 BFD: ipc session parameters change to MP, for session 4Configuration notes• BFD session establishment on an interface does not start until 90 seconds after the interfacecomes up. The reason for this delay is to ensure that the link is not affected by unstable linkconditions which could cause BFD to flap. This delay time is not user-configurable.• BFD supports multi-slot trunks in cases where all BFD packets are transmitted only on a singlepath, which does not change unless the trunk active membership changes. BFD is notsupported on multi-slot trunks where per-packet switching is used (where the path taken bythe BFD packets varies).• The BFD Control Message is a UDP message with destination port 3784.• When you configure BFD, you must set timing and interval parameters.112 Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide53-1002426-02