False OSPF neighbour down alarms, even though CLI commands show interfaces are up

Products

• VMware Smart Assurance
• VMware Telco Cloud Service Assurance

Issue/Introduction

Receiving false OSPF neighbour down alarms, like below:

However, CLI commands show interfaces are up:

As a result: OSPF neighbor events are showing as a false down, and user has numerous false OSPF errors.

Environment

Smarts 10.1.X / 2.X

Cause

Incorrect information reported from the devices SNMPAgent.

Resolution

Verify information reported from SNMPAgent by running the following command to verify the information reported for the SNMPAgent:

./sm_snmpwalk -c <CommunityString> -o  1.3.6.1.2.1.14.7.1.12 <IPAddress>

Then, open the .mimic file and look for the relevant OID:

 .1.3.6.1.2.1.14.7.1.12.<IPAddress>.0

That tells us the status OSPF neighbor relationship. It may not say DOWN, but declares a invalid interface type - loopback instead of the actual interface.

FIX: Deleting All gateway routers, and their corresponding events, and then rediscovering the gateway router solved this issue. Another more drastic fix would be to start the NPM domain with a fresh RPS.