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Cisco Bug: CSCul60101 - Queue Limit for Default Queue not communicated on interface rate change

Last Modified

Dec 11, 2015

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.4(1)S 15.4(2)S 15.4(3)S

Description (partial)

Symptom:
Possible tail drops at lower than expected data rate on an interface following a interface rate change.

Conditions:
When the data rate of a interface is increased, the recalculated default queue queue-limit was not always applied.  This problem only occurs on data rate increases, updated queue-limit is applied correctly if the data rate is reduced.  This issue is mainly applicable to interfaces with no output QoS queuing policy applied.

In addition this issue is specific to interfaces where the bandwidth can change dynamically such as MLPPP, MLFR, and Aggregate GEC interfaces as links are dynamically added and removed from the bundle interface.  Can also occur with other interface types such as ATM PVCs, Serial, and ethernet should the user reconfigure the interface data rate.
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