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Cisco Bug: CSCvu28005 - Timeout drops seen on 32G fabric switches after ISSU

Last Modified

Oct 22, 2020

Products (1)

  • Cisco MDS 9000 NX-OS and SAN-OS Software

Known Affected Releases

8.4(2)

Description (partial)

Symptom:
After many ISSUs and/or ISSDs, a small number of data traffic frame timeout drops occur immediately after an ISSU/ISSD completes.

The slot 1 show logging onboard timeout-drops command shows the drop type and date as follows:
<pre>
------------------------------------------------------------------------------------------------
ERROR STATISTICS INFORMATION FOR DEVICE DEVICE: FCMAC
------------------------------------------------------------------------------------------------
    Interface      |                                                |         |    Time Stamp  
      Range        |            Error Stat Counter Name             |  Count  |MM/DD/YY HH:MM:SS
                   |                                                |         |                
------------------------------------------------------------------------------------------------
fc1/7              |F32_TMM_PORT_TIMEOUT_DROP                       |2        |06/11/20 14:38:30
</pre>

Conditions:
This issue applies to MDS 32 G fabric switches only, specifically:

MDS 9132T
MDS 9148T
MDS 9396T
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