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BFD on main port-channel or port-channel sub-interfaces can go down after removing an unrelated Vrf/Vlan config
Removing VRF, Vlan configuration and remove port-channel sub-interface.
Reboot or shut / no shut of affected port channel.
Not every VLAN / VRF deletion will trigger the issue. See Reproduciton example (bfd still up after vrf and multiple interface deletion) N9k(config)# no vrf A N9k(config)# no snmp-server context A vrf A N9k(config)# router bgp 64950 N9k(config-router)# no vrf A N9k(config-router)# no interface port-channel107.3749 N9k(config)# no interface Vlan201 N9k(config)# no interface Vlan15 # sh bfd nei vrf all OurAddr NeighAddr LD/RD RH/RS Holdown(mult) State Int Vrf Type 10.1.1.1 10.1.1.2 1090519044/1090519044 Up N/A(3) Up Po107.3747 B SH 10.2.2.1 10.2.2.2 1090519045/1090519045 Up N/A(3) Up Po107.3752 C SH N9k(config)# no vlan 15 -> now BFD went down on unrelated interfaces # sh bfd nei vrf all OurAddr NeighAddr LD/RD RH/RS Holdown(mult) State Int Vrf Type 10.1.1.1 10.1.1.2 1090519044/0 Down N/A(3) Down Po107.3747 B SH 10.2.2.1 10.2.2.2 1090519045/0 Down N/A(3) Down Po107.3752 C SH
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