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Stackwise Virtual is a Cisco virtualization technology that allows for two Catalyst 9500 switches to virtually form a single switch, not unlike VSS with other Catalyst platforms.   This reduces the spanning tree domain and allows for Multi-chassis Etherchanneling (MEC). It will enable the StackWise Virtual pair to form aggregated links to connected switches and devices that supports LAG.

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This past week I have been working on a new campus build-out for one of our customers and came across some interesting behavior regarding 100Gbps and 25Gbps uplinks between switches.

A simplified view of the setup in question is shown below:

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