Source note · Setting up 802.1X authentication for Cisco IP phones
In multidomain authentication a Catalyst switch identifies an authenticated device as a voice device only if the RADIUS server returns device-traffic-class=voice; without it the device is treated as a data device.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco Catalyst 9300
- Subsystem
- 802.1X multidomain authentication
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.18.x
- Checked
- 2026-10-02
Sources
- Security Configuration Guide, Cisco IOS XE 17.18.x (Catalyst 9300 Switches) - Configuring IEEE 802.1x Port-Based Authentication — Cisco Systems · tier 2 current vendor documentation · Configuring IEEE 802.1x Port-Based Authentication > Multidomain Authentication
Cite this note
APA
WarmTransfer. (2026, October 2). Setting up 802.1X authentication for Cisco IP phones: source note cisco-phone-8021x-setup-dtc-voice-required. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-8021x-setup-dtc-voice-required
BibTeX
@misc{warmtransfer-claim-cisco-phone-8021x-setup-dtc-voice-required,
title = {Setting up 802.1X authentication for Cisco IP phones: source note cisco-phone-8021x-setup-dtc-voice-required},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-8021x-setup-dtc-voice-required},
note = {Source note cisco-phone-8021x-setup-dtc-voice-required, checked 2026-10-02}
}