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Cisco Bug: CSCvt51587 - P1 traffic is not honored with HQoS egres policy on 400G main interface of ASR9k 5th gen Ethernet LC

Last Modified

Sep 02, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

When an hierarchical egress queuing policy is applied to 400 gig main interface
on an ASR9k 5th generation Ethernet line card with just a class-default parent shaper,
then the traffic matching the P1 priority queue in the child class may not be honored
and could have drops while competing with other lower priority classes for the parent
shaper tokens

The issue is only observed when
 - the egress policy is applied on the main interface
 - the egress policy has only a class-default in the parent and just a shaper action
 - the parent shaper is less than 400G and there is over-subscription at the parent between P1 and other queues
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Bug Details Include

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