Service router failover alarm not cleared after Edge split brain recovery.

Products

• VMware NSX

Issue/Introduction

An alarm for SR failover is raised and does not clear

Environment

VMware NSX-T 

VMware NSX-T Datacenter 3.x

Cause

In a active-standby service-router, a split brain occurs when the heartbeat between 2 routers is lost and the standby link became active.

When the heartbeat resumes and the original standby (now active) goes back to standby and 2 events occur:

1. Detecting that peer is already active
2. Detecting other link goes to standby

There's an alarm clear trigger that says if peer changes to active, then clear alarm.

1. This is checked in event 1), but peer has been active during entire duration of split brain, hence there is no "state change" on peer.  The trigger is skipped in event 1) processing.
2. Then during event 2, the logic just blindly raises an alarm seeing self leaves active for standby.  After that, there's no more trigger to clear this false alarm.

Resolution

This issue is resolved in VMware NSX-T Data Center 3.2.0.1

If you are having difficulty finding and downloading software, please review the Download Broadcom products and software KB.

If an upgrade is not possible, then restart the standby edge using the edge CLI command:   restart service local-controller