OSPF neighbor vmwNsxTDataCenterPeerAddress moved from full to another state. Action required: 1. Invoke the NSX CLI command `get logical-routers` to get the vrf id and switch to TIER0 service router. 2. Run `get ospf neighbor` to check the current state of this neighbor. If the neighbor is not listed in the output, the neighbor has gone down or out of the network. 3. Invoke the NSX CLI command `ping <OSPF neighbor IP address>` to verify the connectivity. 4. Also, verify the configuration for both NSX and peer router to ensure that timers and area-id match. 5. Check /var/log/syslog to see if there are any errors related to connectivity.