1200 causing switch port to go 'Altn BLK'

[marcus.nutting]

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,

[owillins]

What is the version of IOS running on the 1200 Access Point. Are there any VLANs configured on the AP. If yes what are the VLANS?This will help in troubleshooting the reason for this behaviour.

[marcus.nutting]

Hi,

Software is:

c1200-k9w7-mx.123-4.JA

We don't have any VLAN's on our AP's.

Thanks,

Marcus