Received OSPF MTUMismatch alarm

Products

• VMware Smart Assurance
• Network Observability

Issue/Introduction

Receive OSPF MTUMismatch and OSPF NeighborState alarms when link is down between two neighboring devices, but not OSPF Neighbor Relationship Down alarm

Environment

All Supported Smarts versions

Cause

MTU values are different on the neighboring devices. In one environment that encountered this issue, the MTU values on the devices were MTU1: 1900 and MTU2: 1914. To generate the OSPF Neighbor Relationship Down alarm, the MTU must the same on each device.

Resolution

No fix is required. Smarts Network Protocol Manager (Smarts NPM) is functioning as designed.