Source note · QoS marking and queuing for voice
RFC 8622 moved away from CS1 for lower-effort traffic because domains that treat CS1 as an RFC 2474 Class Selector can forward it with higher precedence than best-effort traffic (priority inversion).
Checked 2026-09-24
- Vendor
- IETF
- Product
- Differentiated Services
- Subsystem
- service classes
- Deployment
- any
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- RFC 8622: A Lower-Effort Per-Hop Behavior (LE PHB) for Differentiated Services — IETF / RFC Editor · tier 1 standards and regulators · Section 6 (Recommended DSCP); Section 10
Cite this note
APA
WarmTransfer. (2026, September 24). QoS marking and queuing for voice: source note qos-marking-cs1-priority-inversion. WarmTransfer. https://warmtransfer.net/knowledge/claims/qos-marking-cs1-priority-inversion
BibTeX
@misc{warmtransfer-claim-qos-marking-cs1-priority-inversion,
title = {QoS marking and queuing for voice: source note qos-marking-cs1-priority-inversion},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/qos-marking-cs1-priority-inversion},
note = {Source note qos-marking-cs1-priority-inversion, checked 2026-09-24}
}