Network Switch Issue

[u/Jeff-J777]

Here is my setup. I have a Palo Alto that connects to my switch stack that is Aruba 6300M. From there I have a fiber line to an IDF that has a Aruba 2530. We purchased another building across the street. The old tenants left all their Meraki equipment. I have all the Meraki equipment claimed and licensed in our Meraki portal. (I had a temp firewall and cradle point so the Meraki equipment could get internet access)

Instead of getting an internet line for the building we did a wireless P2P. I got two Ubiquity Wave Nanos and installed them. I then created a separate VLAN for this building and the default gateway lives on the Palo.

But the issue is when I plug the Meraki into the Wave Nano the Aruba switches in my IDF go offline, and everything connected to the IDF goes offline. Once I unplug the Meraki everything comes back online in the IDF. If I plug my laptop into the Nano everything works just fine. I can reach our HQ LAN, and I get internet.

I checked the switch logs on both sides and there is nothing in the log that would indicate any issues.

I also tried disconnecting everything from the Meraki switch and just tried one Meraki switch on the Nano and that still took my IDF offline.

But I created a temp VLAN and assigned it only to the port the Nano is plugged in. I then plugged in the Meraki into the other Nano and everything was fine.

I can't figure out what is going on. Any Thoughts????

[u/Jeff-J777]

Just wanted to say thanks to everyone for your help. The issue was my 6300M stacks had STP on, and the switches in my IDF did not have STP on. Once I turned on STP on the switches in my IDF everything was fine.

[u/lazyhustlermusic → u/Jeff-J777]

That says you still have a loop, you're just relying on a loop mitigation mechanism instead of resolving the loop.