Symptom
When the vPC port-channel is shut down on one side, the peer switch vPC remains up. But when vPC config is removed from shotdown port-channel, the peer switch suspends all the VLANs.
n6004-2# 2015 Feb 4 06:21:05 n6004-2 %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 3001 on Interface port-channel30 are being suspended. (Reason: Peer does not have corresponding vPC)
Workaround
Do not remove the vpc config from port-channel even if the interface port-channel is shutdown