Hello everyone, I’m new to the community but I have a strange problem that has been going on over the past couple days that I cannot seem to find a fix for. At our central office we have one main campus with 2 remote buildings that are routed back to us by our ISP. Since around Wednesday morning I have noticed sporadic MAC flapping issues coming across our fiber ports that all have one straight fiber connection from our data center switch to each building.
Each of the buildings have spanning tree configured with bpduguard set on all the access ports and all unused ports are shutdown. Our core Cisco 9300 stack is set as the root bridge with everything coming back to it, but no switch is sending any ports into an errdisable mode. We have checked all the sites for physical loops and found nothing. MAC address tables on all the switches do not display any duplicate MAC addresses, nor does a wire shark packet capture produce any broadcast storms. Me and several other engineers that have a lot more experience than me have looked at the issue and we cannot find out what is going on. Our biggest issue is port Te2/1/8 on our switch, has a link to our ISP Calix switch, which has all of our routing and VLANs for the schools, speaking with them they really had no idea what to do, aside from saying the only traffic they saw coming out of their vlan was STP. Would anyone have any ideas as to what could be going on? Because I’ve ran out.
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