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UConnHealthAndy
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We do have network redundancy across the entire infrastructure. The way it was explained to me was that both fabrics of the network provide LACP bonds between them and that Cisco will not permit cutting over one side then another. LACP has to be configured on the same model of switches. They are bringing in all new equipment and some parts of the network is being virtualized. Therefore the network team is cutting over all at once after the hardware is in place.

It looks like the safest bet would be to shut down the VMs, and power off the hosts. When everything comes back up the new switches will learn the MAC of each physical and virtual device which would make things a lot cleaner.