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Wireless Mesh issues caused by spanning-tree loopguard

Hi all,


I have installed 3 APs in a wireless Mesh network (2 x Root APs and 1 x Mesh AP) at a client site. It seems that whenever my Mesh AP fails over to another parent Root AP, spanning-Tree's loopguard kicks in on the switches trunk connected to the Mesh AP for the native VLAN and CCTV VLAN (cameras are connected to the switch) . This causes a 3 minute network outage for the cameras connected every time.

Can loopgaurd even work on a Wireless Mesh setup? The Mesh Backhaul is essentially a bridge between the mesh connected switches, so I'm assuming when the switches receive BPDUs from different switches on the same trunk link, it will cause issues? I thought the Cisco Mesh had it's own inbuilt loop prevention mechanisms.

Client is running RPVST.

Any assistance would be greately appreciated!


Everyone's tags (3)
New Member

It turns out Loopguard should

It turns out Loopguard should only be configured on Point-to-Point links. That is; when a single  device is connected to the other end of a given port. Mesh being a shared medium should not have loopguard configured on any of its uplinks.

When a mesh connected switch stops receiving BPDUs (MAP fails over to another RAP for example) the switch-to-AP link is still 'UP' and thinks there is a unidirectional link failure.

10 points for me :)

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