I have a network with Cisco 3560 as the L2 edge switch, each switch have two uplink to the Core. Uplink 1 to Core switch 1 and uplink 2 to core switch 2. Core switch have connected together on 2x1Gig etherchannel. Since the edge switches having two uplink and core are interconected, i beleive there is a possible chance for a loop. I am running stp PVST mode, each port are configured with port-fast enabled and bpdu-guard enabled and spanning-tree loopguard default on the global config. How i can impliment this design with a loop free method.
I will be using core 1 as the hsrp active, so would like to keep the uplink2 on edge switch always in blocking mode. what should i do? how can i acheive this?