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Cisco Bug: CSCvi05455 - Egress scheduler not configured correctly for default class traffic

Last Modified

Oct 16, 2018

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

7.0(3)F3(4.51) 7.0(3)FR(1.36)

Description (partial)

Unexpected drops seen with QoS policy configured and traffic congestion. With multiple queues configured (priority queue, default queue, additional queues), the following behavior is seen:

Oversubscription only on default queue - drops seen across all queues except priority queue
Oversubscription only on low priority queue - other low priority queues drop, but default and priority queue do not drop
Oversubscription only on priority queue - all other queues drop (this is expected behavior)

Multiple egress queues configured - issue is not seen with only priority queue and default queue.

Seen on N9K-X9636C-RX
Seen on 7.0(3)F3(3) and 7.0(3)F3(4)
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