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Cisco Bug: CSCuq86118 - SIP-400: BFD flaps due to delay cause by QoS scheduler

Last Modified

Sep 14, 2019

Products (1)

  • Cisco 7600 Series Routers

Known Affected Releases


Description (partial)

Unpredictable high latency of the order of couple of seconds seen sometimes, when QoS with non-llq queueing policy applied on interfaces on SIP-400, with greater than 43Mbps bandwidth and configured with low bandwidth shaper. 
This bug does not affect LLQ traffic.
Also, bug applicable to all releases starting from 15.1(3)S.

Hierarchical queueing policy with several non-llqs with low bandwidth parent shaper applied on higher speed interfaces on SIP-400 and parent shaper is congested with traffic from different class queues. Effect is more prominent on non-llq traffic with lower *bandwidth share*.
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