Cisco AP send BPDU on Cisco Switch?

Lost & Found — Mon, 05 Jul 2021 18:56:21 GMT

Hi All,

We have a Cisco AP AIR-AP2802(18.5) typical flexconnect setup which connected on managed switch which have a BPDU guard enabled and the issue is that recently we can see that the AP send BPDU causing the interface to get disabled which result connection issue which clients connected to that AP.

Seen that this mostly due to bug on the current AP version but we have multiple site using this same AP model and version but only a single site getting this issue and note that we just recently encountered this and this happens on a random time/day.

Question:

Is it possible that the wireless client (laptop,ipphones,mobile) can forward/genarate a BPDU to AP then AP forward the BPDU message to switch?
If #1 is true, How can we prevent this and identify which host mac address sending the BPDU messages? From below logs cannot see that BPDU is being received facing the AP.

From below logs: 
I cant see any hits that BPDU messages are sent.
-- Log( Occurred random time/day):
 %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/1, changed state to up

-- STP BPDU STATS ON C2960:
 Port 1 (GigabitEthernet2/0/1) of VLAN010 is designated forwarding 
   BPDU: sent 523823, received 0
 Port 1 (GigabitEthernet2/0/1) of VLAN020 is designated forwarding 
   BPDU: sent 523823, received 0
 Port 1 (GigabitEthernet2/0/1) of VLAN030 is designated forwarding 
   BPDU: sent 523823, received 0
 Port 1 (GigabitEthernet2/0/1) of VLAN040 is designated forwarding 
   BPDU: sent 523823, received 0
 Port 1 (GigabitEthernet2/0/1) of VLAN050 is designated forwarding 
   BPDU: sent 523823, received 0

Is is possible to filter,block,disable the BPDU on AP?

Thank you

Re: Cisco AP send BPDU on Cisco Switch?

Leo Laohoo — Wed, 15 Apr 2020 11:13:29 GMT

Are you talking about CSCur86600?

Re: Cisco AP send BPDU on Cisco Switch?

Lost & Found — Wed, 15 Apr 2020 11:34:07 GMT

Hi, Saw that also in previous raised cases here but mine is different model and version so I think that bug is not related.

Re: Cisco AP send BPDU on Cisco Switch?

d.friday — Wed, 15 Apr 2020 13:27:15 GMT

As a work around why not try disabling BPDU guard on the switch ports the APs are physically connected to ?

Re: Cisco AP send BPDU on Cisco Switch?

Lost & Found — Wed, 15 Apr 2020 13:55:15 GMT

Hi,

Switch interface and AP is now running without any issue right now. It just we've encountered this last week on our a specific site and just want to identify the main reason why BDPU guard triggered on all of our switch interface facing APs.

Thanks

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Cisco AP send BPDU on Cisco Switch?

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