If supported on the 2960, make a dual Etherchannel and connect one link to each 3750G that's been stacked with the other. This allows usage of both unlink ports without one needing to be blocked in a spanning tree configuration. (It also precludes the need for STP since there are no logical loops, but good idea to have it enabled; preferably using one of the newer rapid variants.)
Using the stack cable between 3750s effectively provides an eight gig link between them. Becoming one device offers different advantages. For instance, you can route between VLANs just by activation of "ip routing", a routing protocol or explicit statics isn't needed as might be if the two 3750G were kept as individual L3 devices.
If routing on the 3750Gs, use HSRP so the gateway MAC doesn't change with failure of the stack master.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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