Appendix A      System Error Messages
Error Message and Recovery Procedures
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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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Link Message
This section contains the Link error message.
LINK-4-ERROR [chars] is experiencing errors.
Explanation
This messages means that excessive errors have occurred on this 
interface: [char] is the interface.
Action   Check for duplex mismatches between both ends of the link.
Note The previous error is a LINK-4-ERROR message, which is logged at the 
Warning level. LINK-3-ERROR messages are more severe and are logged at 
the Error level.
LRE Link Messages
This section contains the LRE Link error messages.
LRE_LINK-3-UPDOWN: Interface changed state to up or down
Explanation This message means that the link between the LRE port and the 
CPE device has been lost and that no Ethernet traffic is being transferred. This 
could be the result of reconfiguring the port, reconfiguring a profile in use by 
this port, a physical disconnection or reconnection of the LRE connector on 
the switch, or by someone disconnecting the CPE LRE cable or cycling its 
power. It might also be caused by any substantial interruption of the signal or 
cabling between the LRE port and the CPE.
Action   If someone is reconfiguring the port or the profile in use, ignore this 
message. However, if the LRE link does not go back up within a minute or so, 
it could mean a physical disconnection at the switch or CPE or a loss of power 
to the CPE.
LRE_LINK-3-PROFILE_FAILURE: Interface, profile failure
Explanation
When the switch reloads or when the LRE link is lost, the LRE 
port first attempts to briefly establish link with the CPE in a common, reduced 
rate mode. This is so that the switch can exchange configuration information