I had to introduce a Cisco switch into my Meraki environment a few months ago. In my topology map for one of my networks, the Cisco switch keeps jumping around where its connected to its neighbor. It should be connecting to the root bridge (my core switch via single mode fiber), but it shows its neighbor is the firewall or sometimes another switch. My STP bridge priority is set to my core switch (4096). The Cisco's uplink SFP port is the native VLAN 1, which is the management VLAN in my dashboard.    On my Cisco switch, aside from some of the ports configured for the native VLAN 1, I have a ports configured for my security VLAN and wireless VLAN. I opened a case with Cisco and they state the Cisco switch is acting as the STP bridge for the Security and Wireless VLANs and therefore causing the switch to jump around on my topology map.    I have several Meraki switches on different networks that have a mix of VLANs and do not exhibit this behavior. They all recognize the STP bridge priority I have set.   What can I do that will force the Cisco switch to recognize the STP bridge priority. Mind you, everything works, but it's concerning, especially if I will have to deploy more Cisco switches in the future.   Thank you in advance. ... View more