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SD-WAN QOS

Queues

SD-WAN has 8 queues.

Queue 0

  • Cannot be disabled
  • LLQ
  • Control Traffic
    • OMP, BFD

Queue 2

The default queue.

If QoS is not configured, all user traffic will take Queue 2.

Queue example

policy
 class-map
  class CL_REAL_TIME queue 0
  class CL_CRITICAL_DATA queue 1
  class CL_BEST_EFFORT queue 2

Tables

Example Class List to Queues

ClassQueueMethod
LLQ (Voice)0LLQ
CRTICAL_DATA1WRR
BULK2WRR
CLASS_DEFAULT3WRR
INTERACTIVE_VIDEO4WRR
CONTROL SIGNALING5WRR
Unused6WRR
Unused7WRR

Example Bandwidth and Buffer Values

QueueBandwidthBufferDrops
01010Tail Drop
13030Random Early (RED)
21010Random Early (RED)
32020Random Early (RED)
42020Random Early (RED)

References

Cisco - Forwarding and QoS Configuration Guide for vEdge Routers, Cisco SD-WAN Release 20

Last Modified • Saturday, June 27, 2026. 12:39 am UTC+00:00 • Commit: f69a731