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The %SYS-3-PORT_ERR: Port mod_num/port_num swBusCRCErrorDrop messages are logged on a Catalyst 5000 switch due to a duplex mismatch on an ISL trunk

Resolution

If there is a duplex mismatch on an Inter-Switch Link (ISL) trunk into a Catalyst 5000 switch, the swBusCRCErrorDrop errors will be seen on all ports of the switch.

The port with the mismatch will also see RxInnerCRCErrorDrop errors. If this mismatch is allowed to continue, traffic between buses can be dropped.

The errors will look similar to this:

2002 Dec 18 22:14:17 met +01:00 %SYS-3-PORT_ERR:Port 6/1 swBusCRCErrorDrop(11)

2002 Dec 18 22:14:17 met +01:00 %SYS-3-PORT_ERR:Port 6/2 swBusCRCErrorDrop(11)

2002 Dec 18 22:14:17 met +01:00 %SYS-3-PORT_ERR:Port 6/3 swBusCRCErrorDrop(11)

2002 Dec 18 22:14:17 met +01:00 %SYS-3-PORT_ERR:Port 6/4 swBusCRCErrorDrop(11)

2002 Dec 18 22:14:17 met +01:00 %SYS-3-PORT_ERR:Port 6/4 RxInnerCRCErrorDrop(6158)

2002 Dec 18 22:14:17 met +01:00 %SYS-3-PORT_ERR:Port 6/5 swBusCRCErrorDrop(11)

2002 Dec 18 22:14:17 met +01:00 %SYS-3-PORT_ERR:Port 6/10 swBusCRCErrorDrop(11)

2002 Dec 18 22:44:18 met +01:00 %SYS-3-PORT_ERR:Port 6/4 RxInnerCRCErrorDrop(6341)

In this example, port 6/4 has a mismatch as it is seeing the RxInnerCRCErrorDrop errors.

 

To resolve this issue, perform these steps:

  1. Hard code the speed and duplex settings on both sides.

    To hard code the speed and duplex, issue the set port speed and set port duplex commands.

    For example, these commands would be issued to set the speed to 100 and the duplex to full on port 3/2:

    • set port speed 3/2 100
    • set port duplex 3/2 full
  2. If the messages persist after the speed and duplex settings are hard coded,  a software upgrade may be required to the latest maintenance release for the installed Catalyst OS (CatOS)      train.
  3. Another possible option is disabling the ports with the duplex mismatch by issuing the set feature fw-disable enable command, introduced in 5.5(13).

    This example shows how to turn on the feature to disable the port with the duplex mismatch:

    Console> (enable) set feature fw-disable enable
    no ISL entry feature enabled.
    Console> (enable)
    

Version history
Revision #:
1 of 1
Last update:
‎06-17-2009 10:21 PM
Updated by:
 
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