NSX-T LM (Local Manager) -LM (Local Manager) communication sync time-out

Products

• VMware NSX Networking

Issue/Introduction

Symptoms:

• Inter-site traffic hitting default rule rather than more specific rule. ( Traffic from VM from site-1 hitting VM on site-2 hitting default-rule)

Environment

VMware NSX-T Data Center

Cause

• LM - LM sync happens over port 1236 broken
• Remote site data entries are kept on hold for 24 hours ( default) after which would be cleaned if remote-site is disconnected.
• All data received from disconnected /delete remote site will be cleaned up after this time. ( default 24 hours)

Resolution

Always check the LM -LM sync status ( state should be in 'synched' state)

# get site-replicator remote-sites

 

Check the status of the port# 1236 on LM ( should be in established state with both GM nd LM)

# netstat -nap | grep 1236

 

Check the network connection from LM

# nc -v lm-manager-ip port

Additional Information

Impact/Risks:

If the LM-LM syn is failing/ sync fails, DATA entries learned would be removed leading to inter-site traffic disruption after 24 hours.