/var/log/syslog
you see entries similar to the following:edge-1 bgpd 18625 - - [EC 100663301] INTERFACE_STATE: Cannot find IF vti-804 in VRF 0
edge-1 ospfd 18824 - - [EC 100663301] INTERFACE_STATE: Cannot find IF vti-804 in VRF 0
/var/log/frr/frr.log
BGP: [EC 33554465] 100.83.141.41 [FSM] Failure handling event BGP_Start in state Idle, prior events BGP_Start, BGP_Start, fd -1
BGP: [Event] Incoming BGP connection rejected from <IPv4-address-1> since it is not directly connected and TTL is 1
/var/log/syslog
nsx-edge-1 bgpd 22005 - - [EC 33554465] <IPv6-address-1> [FSM] Failure handling event BGP_Start in state Idle, prior events BGP_Start, BGP_Start, fd -1
nsx-edge-1 bgpd 22005 - - [EC 33554465] <IPv6-address-2> [FSM] Failure handling event BGP_Start in state Idle, prior events BGP_Start, BGP_Start, fd -1
/var/log/syslog
edge-1 staticd 33893 - - Static Route using downlink-8786 interface not installed because the interface does not exist in specified vrf
edge-1 staticd 33893 - - Static Route using downlink-8786 interface not installed because the interface does not exist in specified vrf
Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.
VMware NSX-T Data Center 3.x
VMware NSX 4.x
Routing controller reads interface kernel notifications via netlink socket.
During edge reboot, netlink notifications might get dropped/missed.
This leads to missed configuration on the interfaces in comparison to the kernel.
Workaround:
To recover the missing IPv4/IPv6 addresses, the interfaces can be rescanned using the below command in the edge node CLI as admin user:
Edge> get logical-routers
Edge> vrf <vrf_id of SERVICE_ROUTER_TIER0>
Edge(tier0_sr)> set debug
Edge(tier0_sr)> start rescan interfaces
Edge(tier0_sr)> exit
NOTE: For VMware NSX versions prior to 4.1.2, please do not use the workaround on EVPN enabled setups.
For additional information related to specific scenarios impacting BGP neighbors failing to establish due to IPv4/IPv6 addresses missing on NSX-T edge node interfaces, please refer the following kb:
https://knowledge.broadcom.com/external/article?articleNumber=322523