Hello, I have a question if I Stack a Catalyst 3750 L3 with a Catalyst just L2, will we able to use all L3 capabilities?
The switch models are not indicative. You need to provide the output of the "sh version" to determine what feature set is being used. The rule-of-thumb is for all stack members to run the same IOS version and the same feature set.
The switches are not connected yet, they are in their box, it will be a new implemntation. And we just would like to know if is possible using L3 capabilities in a Stack with one Layer 3 Switch and the rest of them just L2.
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Unless the V2 is different from the original 3750s, you could mix feature sets within the same stack. Stack election takes into account feature set. You do want all switches to have the same installed version.