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cisco hierarchical design - collapse core

Let's says one the customer is using collapse core design. The core  layer actually consist of distribution layer, the distribution layer  actually is part of core. The distribution switches is stackwise with  same model C3750 and using 4 cable as etherchannel with the core  switches, both model is C4506. Will this lead to STP loop? The core  layer switches is H.A. using VRRP.

The other thing is that the  access layer switches C2960, one of the switches is directly connect to  core switches while some switch in access is connecting to distribution  switch. You think this design have any flaw? Please refer to the picture  upload. Thanks guys!

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