Unable to ping vm after host upgrade to 5.1

i have migrated vms form one of my esxi 4.1 to another esxi 4.1 under cluster there on vc 5.1

then upgraded one host to 5.1-it was successful,host is reachable in network

but when i migrated[vmotion] vms back to esxi 5.1,am unable to ping any of vms on esxi 5.1

even tried form esxi 5.1 console as well-unable to ping vms,while network given on vms is reachable form host

Please advice if anything else i have do before moving back vms to esxi 5.1 ?

and will it includes major downtime for my prod vms?
patronTechnical consultant Asked:
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If you have multiple nic's and aggregating the links it may be your root cause.
For diagnostic purposes....
Simply eliminate the physical connections down to one.
If this resolves the problem, look at your switch port setting, vswitch etc.
patronTechnical consultant Author Commented:
have 2 physical nics on host,once is used for vswitch0 for management and vmotion

another vswitch1 for prod vlan to be used for vm
The only time I've seen this issue was with aggregation.
Though if you run out of solutions, I would try jus one simple line and one vswitch, just to test.
patronTechnical consultant Author Commented:
Thanks a lot,its something tempered by network team at switch level , so vlan was missed form switch ,now issue resolved

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