I am uploading a topology diagram here. I believe I have the answer already, but I am confused as to what I was seeing. During a switch replacement, I know it looks sloppy but this is not the end result. Switch B has loopguad enabled globally. it shutddown inconsistent to switch A on that port. Switch A is the only uplink to the rest of the network for all downstream switches B,C,D,E switch A is layer 2 only and has a management IP on interface vlan 37 all switches are using Rapid-PVST and have loopguard disabled, except switch B. Switch E is the root bridge for all vlans I got a ping monitoring alert, that switch A went down. I cannot access it, but the uplink to jo_mdf_gig from switch A shows forwarding and up. Also I can ping everything else, but... nothing connected directly to switch A works. It seems to only allow layer 2 to pass through it. I can access switch B remotely, and everything downstream works, the uplink from B to A shows up and forwarding except: Switch B shows errors for loopguard inconsistent ports on the uplink to switch A I turned off loopguard on switch B, which fixed the problem. Upon further investigation, this site had Switch E as the root bridge for all vlans in spanning-tree, I have since moved it to a closer distribution layer switch upstream. My questions are... why would the int vlan 37 on switch A go down at all? and why would layer two still allow everything downstream to respond to pings still if switch B was blocking inconsistent to that uplink...?
