Aggregate Port with FS switch

[Nori_Mir]

Hi All Network Guru.

I have just setup 3 stacked MS225 switches and it has a single uplink to a FS core switch. I decide to setup a dual uplink for redundancy purposes and so I went ahead and configured 2 aggregate port on the Meraki (port26 on switch27 and port 49 on switch 29) and FS end. But as soon as I switch from the single uplink and connected to the aggregate port on the Meraki end, the entire stacked went offline. I am wondering if this is because BPDU guard is enable on the Meraki end? I am trying to get some idea where I can start troubleshooting and what is likely the cause of it so any pointers will be greatly appreciated!

Whereas Over at the FS end I realize that the BPDU guard is disable

I read from the community forum and I understand that for uplink it is better to enable loop guard instead, as BPDU guard are enable on the access and client end to prevent spanning tree

[Ryan_Miles]

It's not advised to run BPDU guard on ports connected to neighboring switches https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Configuring_Spanning_Tree_on_Meraki_...

[Nori_Mir]

So what will be the best recommendation for dual uplink? loop guard with UDLD enforced or nothing at all?

[Ryan_Miles · Accepted solution]

At most I would consider root guard. But honestly if it were me I wouldn't use any guard mode and rather just ensure you have spanning tree priorities configured appropriately for having deterministic behavior of what switch is root in the topology. 

[Nori_Mir]

Hi

Just disable all the BPDU guard from the STP setting and it works! both link are up and running now

[RandallWatts]

Thanks for the link, you made my day 🙂