Each SD-WAN interface has eight queues, numbered 0 to 7. Queue 0 carries control traffic and LLQ traffic, and any forwarding class mapped to queue 0 must be configured for LLQ.

Checked 2026-09-24

Vendor

Cisco

Product

Cisco Catalyst SD-WAN

Subsystem

QoS

Deployment

sd-wan-controller-mode

Region

not restricted

Release range

IOS XE Catalyst SD-WAN 17.x

Checked

2026-09-24

Sources

• Cisco Catalyst SD-WAN Forwarding and QoS Configuration Guide, Cisco IOS XE Catalyst SD-WAN Release 17.x - Forwarding and QoS — Cisco Systems · tier 2 current vendor documentation · QoS overview / queues and scheduling

Cite this note

APA

WarmTransfer. (2026, September 24). SD-WAN considerations for voice: source note sdwan-voice-qos-queue0. WarmTransfer. https://warmtransfer.net/knowledge/claims/sdwan-voice-qos-queue0

BibTeX

@misc{warmtransfer-claim-sdwan-voice-qos-queue0,
  title  = {SD-WAN considerations for voice: source note sdwan-voice-qos-queue0},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/sdwan-voice-qos-queue0},
  note   = {Source note sdwan-voice-qos-queue0, checked 2026-09-24}
}

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