Source note · SD-WAN considerations for voice
SD-WAN BFD packets are marked DSCP 48 (CS6) and placed in the low-latency priority queue (LLQ) before transmission.
Checked 2026-09-24
BFD packets are marked with DSCP 48, which is equivalent to CS6 or IP Precedence 6.
- Vendor
- Cisco
- Product
- Cisco Catalyst SD-WAN
- Subsystem
- QoS
- Deployment
- sd-wan-controller-mode
- Region
- not restricted
- Release range
- Manager 20.6 and earlier (design guide scope)
- Checked
- 2026-09-24
Sources
- Cisco Catalyst SD-WAN Design Guide — Cisco Systems · tier 2 current vendor documentation · BFD / QoS section
Cite this note
APA
WarmTransfer. (2026, September 24). SD-WAN considerations for voice: source note sdwan-voice-bfd-dscp48-llq. WarmTransfer. https://warmtransfer.net/knowledge/claims/sdwan-voice-bfd-dscp48-llq
BibTeX
@misc{warmtransfer-claim-sdwan-voice-bfd-dscp48-llq,
title = {SD-WAN considerations for voice: source note sdwan-voice-bfd-dscp48-llq},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sdwan-voice-bfd-dscp48-llq},
note = {Source note sdwan-voice-bfd-dscp48-llq, checked 2026-09-24}
}