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Cisco Bug: CSCsz40834 - IOS-XR MDRR weight calculations should behave similarly to IOS

Last Modified

Jan 07, 2017

Products (1)

  • Cisco 12000 Series Routers

Known Affected Releases

3.7.1.BASE 3.8.0.BASE

Description (partial)

Symptom:

If a policy map is configured which has non-guaranteed bandwith in classes, in addition to a relatively low queue-limit, such as the following:

<CmdBold>
 class control_class_xr
  bandwidth percent 20
  queue-limit 200 packets
 !
 class cos2_class_xr
  bandwidth remaining percent 80
  queue-limit 200 packets
<noCmdBold>

In situations where we are oversubscribing the interface with line-rate small packets, we may see packet drops that do not match the bandwidth remaining percents defined.
Conditions:

- Line rate small packets
- Low queue-limit defined
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