10-25-2017 06:13 AM - edited 03-08-2019 12:29 PM
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.
10-25-2017 07:14 AM
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
10-25-2017 07:18 AM
10-25-2017 12:56 PM
@mwardale777 wrote:
They are access ports, this is why I am confused about the switch is expecting BPDU frame.
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.
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