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Cisco Bug: CSCvv78040 - TCAM utilisation shoots up after Next-hop interface flaps : ITD service

Last Modified

Sep 22, 2020

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

8.4(3)S36

Description (partial)

Symptom:
1. TCAM utilisation shoots up to quite high values.

2. Syslogs of the type (as listed below) are seen:

2020 Sep 11 19:45:05 POCH_M3_SUP2E %RPM-2-PPF_SES_VERIFY:  rpm [7688]  PPF session verify failed in client aclqos(Line card  7/VDC  NONE/UUID  366) with an error 0x41040079(Insertion of TCAM entry failed due to Spanslogic TCAM constraints

Issue is seen even with low scale of ITD/PBR policies/ACEs.

Conditions:
Issue was seen when ITD policies were applied on different port-channel interfaces whose members belonged to the same ASIC instance on the same M3 module.

Trigger: Flapping of NH-interfaces one-by-one in a loop.
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