UDLD Error

[mwardale777]

Hi everyone,

I have a customer who has seen an this issue;

A UDLD error condition has been detected please investigate.

10/10/2017 17:11 : PM-SW2_STBY-4-ERR_DISABLE  1418862: 10.60.10.60: Oct 10 16:11:33.895: %PM-SW2_STBY-4-ERR_DISABLE: bpduguard error detected on Gi121/4/0/7, putting Gi121/4/0/7 in err-disable state

A UDLD error condition has been detected please investigate.

10/10/2017 17:11 : PM-SW2_STBY-4-ERR_DISABLE  1418861: 10.60.10.60: Oct 10 16:11:33.619: %PM-SW2_STBY-4-ERR_DISABLE: bpduguard error detected on Gi122/2/0/36, putting Gi122/2/0/36 in err-disable state

A UDLD error condition has been detected please investigate.

10/10/2017 17:11 : PM-SW2_STBY-4-ERR_DISABLE  1418863: 10.60.10.60: Oct 10 16:11:34.211: %PM-SW2_STBY-4-ERR_DISABLE: bpduguard error detected on Gi112/1/0/32, putting Gi112/1/0/32 in err-disable state

I am remote to this job and as I am led to believe, they only have desktops and laptops connected to the ports in question, so I am leaning more to a bug than a configuration issue.

[paul driver]

Hello

Can you confirm what type of ports these are? ( access or  trunk)

It seems to suggest that a physical issue is occurring and as a result one side of the the link is thinking it applicable to begin forwarding or is now excepting bpdu's and as a result the port is error disabling

res

Paul

[mwardale777]

Hi Paul,

They are access ports, this is why I am confused about the switch is expecting BPDU frame.

I have attached the show tech

Thanks,

[Leo Laohoo]

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@mwardale777 wrote:

They are access ports, this is why I am confused about the switch is expecting BPDU frame.

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You are getting a two-for-one-special.  

The switch has detected the downstream port sending back BPDU and initiated a "self protection" by invoking BPDU Guard (and disabling the port). 

Immediately after the port goes into error-disable, the UDLD detection kicks in.  I believe this is a bug.  

The real cause of the port going down isn't due to UDLD but caused by BPDU.