Will there be any problems to amy production environment if a VSAN is segmented?are there any drawbacks of this behaviour?
Yes, if the VSANs are enabled across the ISL, and there is nothing to keep them from merging, then they will no longer be segmented once the ISL comes up. Things that would prevent a successful merge are a domain ID conflict. IE: both switches are coded to have the same static domain ID for the VSAN....also...a Zoneset merge failure. This would be caused by each side having the same Zone name, but not the exact same zone members.