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Cisco Bug: CSCuq64370 - GEXPE: Traffic drops to 40% on upgrade with a specific config

Last Modified

Feb 01, 2017

Products (1)

  • Cisco ONS 15454 Series Multiservice Provisioning Platforms

Known Affected Releases

10.02 10.10 9.606

Description (partial)

Symptom:
40% - 45% traffic loss observed on GE UNI port, with discard error counter proportionately incrementing on GEXP card.

Conditions:
When there are two GEXP cards connected with GE NNI ports, and there is a channel group present with 3 GE ports connected back to back between the GEXP cards. The GEXP cards can be in the same chassis or different chassis.  And single GE client port is present in each of the GEXP cards, with transparent QinQ enabled and the cards are in L2 mode.

The problem is not consistently reproducible on all setups and at all times. It is rare, but the user observes 40% to 45% traffic loss with traffic being discarded on a GE client port, configured as UNI port. This is the symptom during problem scenario.
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