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OPERATIONAL DEFECT DATABASE
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- BFD keeps flapping randomly with IPV6 configuration
Not applicable
Not applicable
Mar 24 00:30:47.011: %BFDFSM-6-BFD_SESS_DOWN: BFD-SYSLOG: BFD session ld:13 handle:2,is going Down Reason: RX DOWN Mar 24 00:30:47.012: %BGP-5-NBR_RESET: Neighbor 2402:34C0:2022:1012::11A reset (BFD adjacency down) Mar 24 00:30:47.014: %BGP-3-NOTIFICATION: received from neighbor 2402:34C0:2022:1012::11A 6/0 (CEASE: unknown subcode) 0 bytes Mar 24 00:30:47.014: %BGP-5-ADJCHANGE: neighbor 2402:34C0:2022:1012::11A Down BFD adjacency down Mar 24 00:30:47.014: %BGP_SESSION-5-ADJCHANGE: neighbor 2402:34C0:2022:1012::11A IPv6 Unicast topology base removed from session BFD adjacency down Mar 24 00:30:47.014: %BFD-6-BFD_SESS_DESTROYED: BFD-SYSLOG: bfd_session_destroyed, ld:13 neigh proc:BGP, handle:2 active Mar 24 00:30:47.017: %BFDFSM-6-BFD_SESS_UP: BFD-SYSLOG: BFD session ld:13 handle:2 is going UP Mar 24 00:30:47.532: %BGP-5-NBR_RESET: Neighbor 2402:34C0:2022:1011::11A reset (BFD adjacency down) Mar 24 00:30:47.532: %BGP-5-ADJCHANGE: neighbor 2402:34C0:2022:1011::11A vpn vrf 1 Down BFD adjacency down Mar 24 00:30:47.532: %BGP_SESSION-5-ADJCHANGE: neighbor 2402:34C0:2022:1011::11A IPv6 Unicast vpn vrf 1 topology base removed from session BFD adjacency down Mar 24 00:30:49.875: %BFD-6-BFD_SESS_CREATED: BFD-SYSLOG: bfd_session_created, neigh 2402:34C0:2022:1011::11A proc:BGP, idb:GigabitEthernet0/0/2.340 handle:1 act Mar 24 00:30:49.875: %BGP-5-ADJCHANGE: neighbor 2402:34C0:2022:1011::11A vpn vrf 1 Up Mar 24 00:30:50.894: %BGP_SESSION-5-ADJCHANGE: neighbor 2402:34C0:2022:1012::11A IPv4 Unicast topology base removed from session Capability changed Mar 24 00:30:50.896: %BGP-5-ADJCHANGE: neighbor 2402:34C0:2022:1012::11A Up - We have tried to remove the ipv6 configuration and then the BFD stopped flapping - Both ISR4K and Fortigate FW configured with IPV6 global address - Neighbor IPV6 address: 2402:34C0:2022:1012::11A - Source IPV6 address: 2402:34C0:2022:1011::11 - Outputs and debug logs have been uploaded as attachments