Starting with IOS XE 17.4 the Catalyst 9800 WLC trusts the client DSCP in the AP join profile by default (qos-map trust-dscp-upstream), preserving client DSCP upstream.
Checked 2026-10-02
Starting from version 17.4, the default behaviour for the Cisco 9800 WLC is to trust the DSCP value in AP join profile.
- Vendor
- Cisco
- Product
- Catalyst 9800 Wireless Controller
- Subsystem
- Wireless QoS
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.4 and later
- Checked
- 2026-10-02
Sources
- Configure Validate and Troubleshoot Wireless QoS on 9800 WLC — Cisco · tier 2 current vendor documentation · AP join profile / trust DSCP section
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting voice QoS markings that are stripped or ignored: source note voice-qos-troubleshooting-c9800-trust-dscp-17-4. WarmTransfer. https://warmtransfer.net/knowledge/claims/voice-qos-troubleshooting-c9800-trust-dscp-17-4
BibTeX
@misc{warmtransfer-claim-voice-qos-troubleshooting-c9800-trust-dscp-17-4,
title = {Troubleshooting voice QoS markings that are stripped or ignored: source note voice-qos-troubleshooting-c9800-trust-dscp-17-4},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/voice-qos-troubleshooting-c9800-trust-dscp-17-4},
note = {Source note voice-qos-troubleshooting-c9800-trust-dscp-17-4, checked 2026-10-02}
}