01-13-2013 09:02 PM - edited 03-07-2019 11:04 AM
%PM-4-ERR_DISABLE: loopback error detected on Fa0/14, putting Fa0/14 in err-disable state, what is best reason in
ME-3400-24TS-A.
01-13-2013 10:19 PM
Hi,
It means there is L2 loop that spanning-tree detected.
Check you network topology and f0/14 interface configuration:
sh run int f0/14
What device is connected to that port?
Hope it will help.
Best regards,
Abzal
01-13-2013 11:14 PM
Hello Abzal,
It means there is L2 loop that spanning-tree detected
Indeed, there is a switching loop - but the message indicates that the port was not disabled by STP but rather by the port receiving its own LOOP frames. This self-looped detection is distinct and separate from STP. See for more info here:
https://supportforums.cisco.com/thread/2001389
Best regards,
Peter
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