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Cisco Bug: CSCvr93846 - Random timeout drops on fc port of frames from sup-fc0, may trigger portguard

Last Modified

Sep 10, 2020

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.2(19)

Description (partial)

Symptom:
Frames from the supervisor to end devices (such as FCNS control plane frames) time out on a switch egress FC port. 

If Port Guard is configured then it may trigger if it is monitoring timeout discards. The following syslogs can be logged:
<pre>
%PMON-SLOT8-4-WARNING_THRESHOLD_REACHED_UPWARD: Timeout Discards has reached warning threshold in the upward direction (port fc1/1 [0x1000000], value = 9).
%PMON-SLOT8-3-RISING_THRESHOLD_REACHED: Timeout Discards has reached the rising threshold (port=fc1/1 [0x10000000], value=9) .
%PMON-SLOT8-2-PMON_PORTGUARD_ACTION: PortGuard Config applied for Port fc1/1(1000000) Status(5)-(error disable)_Reason(53)-(Timeout Discards).
%PORT-5-IF_DOWN: %$VSAN 1%$ Interface fc1/1 is down (Error disabled - due to PMON failure )
</pre>

Conditions:
This issue only occurs when the congestion drop time out value is set to the minimum value of 200 ms on MDS 9700 platforms.
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