UCS - East West Switching..Not Working I think

Hi all hope you can shed some light.
I understood that the FI's switch east west traffic, Had an issue tonight where we removed Unplugged the north south portchannels to the layer3 network to upgrade the core and all VM's in the UCS lost connectivity to each other even though they are on the same VLAN.
So question is should downing the uplinks really stop east west switching?
Hope you can shed some light,
Thanks

wdey, Thanks for your reply.
End host mode is correct and all Vlans are dual, so yes I see your point with no route between the fabric, some traffic would stop.
The actual "Everything down" issue came from the network control policy "Action on Uplink Fail" being set to Link down. This basically downed the vnics and caused the mild panic, as I understand this needs to be set so that fabric failover will work.
I'll be attempting the swapout again with it set to Warning during the swap so as to try and minimise disruption.
Thanks again.

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