vCenter Server Upgrade Failed Due to Reuse of Temporary IP Address

vCenter Server Upgrade Failed Due to Reuse of Temporary IP Address with error "Cannot run the revert networking command. revert_networking.py doesn't exist on target VC" or "VC upgrade is failing during Install-"target vc upgrade precheck stage failing"

Reuse of temporary IP address causes an arp cache issue. Reset the arp cache on the management domain vCenter Server.

Customers who have fewer Temporary IP Addresses than vCenter Servers that are conducting a parallel upgrade have the hightest likelyhood of impact.

Procedure

1. SSH to the management domainvCenter Server as root.
2. Run the following

   ip -s -s neigh flush all