topic Re: 1200 causing spanning-tree 'Altn BLK' in Wireless

1200 causing spanning-tree 'Altn BLK'

marcus.nutting — Sun, 04 Jul 2021 18:07:45 GMT

Hi,

Can you help please?

I have four 1200's covering an area, with some radio overlap.

One of the AP's is causing it's switch-port to go into spanning-tree "Altn BLK" state constantly.

The AP's are running an more or less 'out-of-the-box' configuration.

The switchport config is here:

---

interface GigabitEthernet2/0/22

switchport access vlan 60

switchport mode access

---

What is causing this, and how can I stop it?

Thanks in advance,

smalkeric — Wed, 21 Sep 2005 20:21:05 GMT

The issue may due to Spanning tree flap .Because of this AP was dropping the BPDU's due to high cpu

marcus.nutting — Thu, 22 Sep 2005 09:07:41 GMT

Hi,

Can you please explain more?

We also have three other AP's plugged into the same switch on the same VLAN, and they are not experiencing a problem.

The problem seems to be the Switch receiveing BPDU's from the AP.

How can this happen if we don't have Bridging configured on the AP?

Thanks,