SecureStack C3/B3 f/w 1.02.05.0004 'show switch stack-ports' command shows Incrementing Errors

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Article ID: 12590 

Products
SecureStack C3, firmware 1.02.01.0004 and higher
SecureStack C2, firmware 5.02.01.0006 and higher (mixed stack)
C3G124-48, C3G124-48P, C3G124-24, C3G124-24P, C3K122-24, C3K122-24P, C3K172-24
SecureStack B3, firmware 1.02.01.0004 and higher
SecureStack B2, firmware 4.02.01.0006 and higher (mixed stack)
B3G124-48, B3G124-48P, B3G124-24, B3G124-24P 

Changes
Stacked two or more units together (5834) in a closed-loop stack, using the C2CAB-SHORT or C2CAB-LONG stacking cables (5668).
Issued the 'show switch stack-ports' command, to view stacking errors. 

Symptoms
Stack port errors are seen to be incrementing at various rates, depending on the amount of traffic passing through the stack. 

Cause
This is related to a change made in firmware x.02.01.000x to accommodate the C2CAB-5M stacking cable, as reported in release notes:
10585   Resolved an issue where stacking switches using a 5 meters cable (C2CAB-5M) would cause errors on stack ports.

Solution/Workaround
For the C3 and B3, upgrade to firmware 6.42.01.0046 or higher. 
Release notes state, in the 'What's New in 6.42' section:
Support for 5M cables added support for 5M stacking cables.

For the C2, upgrade to firmware 5.02.12.0006 or higher. 
Release notes state, in the 'Firmware Changes and Enhancements' section:
14747   Support for the 5M stacking cables has been added in this release.

For the B2, upgrade to firmware 4.02.12.0006 or higher. 
Release notes state, in the 'Firmware Changes and Enhancements' section:
14747   Support for the 5M stacking cables has been added in this release.

Here are the new commands to set for a 5M cable, clear from a 5M cable, or view the cable settings:
set switch stack-ports length <unit#> {down | up} {5m | standard}
clear switch stack-ports length <unit#>
show switch stack-ports length
show switch stack-ports
For more about this, please refer to the "Configuration Guide FW Version 6.42.xx.xxxx", or later edition. 

Workaround: 

For the C3 and B3, upgrade to firmware 6.03.02.0006 or higher.
For C3/C2 mixed stacks, upgrade to firmware 5.02.08.0006 or higher.
For B3/B2 mixed stacks, upgrade to firmware 4.02.08.0006 or higher.
Release notes state, in the 'Firmware Changes and Enhancements' section:
12833   Resolved an issue whereby occasionally members of the stack would report stacking port errors. These messages did not appear to adversely affect the network.
IMPORTANT: This solution is not compatible with 5M cables therefore do not install this maintenance release if you have 5M cable installations. If you are using a 5 meter cable and you install this firmware you will get errors reported on the stacking port.

In summary:
  • Any given stack using one or more of the C2CAB-5M cables should run C3/B3 firmware 6.42.01.0046 or higher, or C3/B3 firmware within the range of 1.02.01.0004 to 6.03.01.0008, or C2/B2 firmware x.02.12.0006 or higher, or C2/B2 firmware within the range of x.02.01.0006 to x.02.07.0006.
  • Any given stack running C3/B3 firmware lower than 6.42.01.0046 or running C2/B2 firmware lower than x.02.12.0006 should not mix use of the longer cables (C2CAB-5M) with the shorter cables (C2CAB-LONG, C2CAB-SHORT), as either the 5M or the LONG/SHORT will potentially elicit these errors.
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