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Cisco Bug: CSCte18140 - Dev:enhancement of queuing of control packets at egress generated by CPU

Last Modified

Feb 04, 2017

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases

12.2(53)SG2

Description (partial)

Symptom:
Under conditions of traffic congestion and over subscription, Cpu generated control packets get dropped and cause undesired behavior in control protocols. E.g. In case of REP protocol the following messages
will be seen
*Nov  4 23:01:37.871: %REP-4-LINKSTATUS: GigabitEthernet2/6 (segment 1) is non-operational due to neighbor not responding
Switch#
*Nov  4 23:01:48.583: %REP-4-LINKSTATUS: GigabitEthernet2/5 (segment 1) is operational
REP loses connectivity and gets back connectivity again.

Conditions:
This issue is seen whenever we have data traffic over subscription on a link.
The issue is present in Cat 4K switches in all releases up to and including 12.2(50)SG6 and 12.2(53)SG1.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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