Source note · Setting up 802.1X authentication for Cisco IP phones
The command authentication event server dead action authorize voice enables critical voice VLAN, which keeps voice devices on the voice VLAN when the RADIUS server is unreachable.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco Catalyst 9300
- Subsystem
- 802.1X configuration
- 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 > Critical Voice VLAN
Cite this note
APA
WarmTransfer. (2026, October 2). Setting up 802.1X authentication for Cisco IP phones: source note cisco-phone-8021x-setup-critical-voice-vlan. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-8021x-setup-critical-voice-vlan
BibTeX
@misc{warmtransfer-claim-cisco-phone-8021x-setup-critical-voice-vlan,
title = {Setting up 802.1X authentication for Cisco IP phones: source note cisco-phone-8021x-setup-critical-voice-vlan},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-8021x-setup-critical-voice-vlan},
note = {Source note cisco-phone-8021x-setup-critical-voice-vlan, checked 2026-10-02}
}