VLAN Configuration Guide, Cisco IOS XE 17.18.x (Catalyst 9300 Switches) - Configuring Voice VLANs

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/17-18/configuration_guide/vlan/b_1718_vlan_9300_cg/configuring_voice_vlans.html

Published

2025-07-31

Updated

unknown

Accessed

2026-10-02

HTTP status

200

License

Cisco documentation; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• On Catalyst 9300 switches running IOS XE 17.18.x, voice VLAN is supported only on access ports, not on trunk ports. The 9500X and 9600X models do not support the Voice VLAN feature. in context
• Cisco documents that enabling IEEE 802.1X on a Catalyst 9300 access port that has a voice VLAN and a connected Cisco IP phone causes the phone to lose connectivity to the switch for up to 30 seconds. in context
• On Catalyst 9300, 'switchport voice vlan' takes four options. A vlan-id (1-4094) makes the phone send voice traffic in that VLAN with 802.1Q priority 5. dot1p makes it use 802.1p frames tagged with VLAN 0. untagged makes it send untagged voice traffic. none lets the phone use its own configuration. in context
• For Catalyst 9300 voice VLAN to configure a Cisco IP phone, CDP must be enabled on the switch port the phone connects to. CDP is enabled globally by default. in context
• On Catalyst 9300 switches, 'show interfaces interface-id switchport' displays the voice VLAN configuration of a port. in context

Cite this source record

APA

WarmTransfer. (2025, July 31). VLAN Configuration Guide, Cisco IOS XE 17.18.x (Catalyst 9300 Switches) - Configuring Voice VLANs. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cat9300-1718-voice-vlans

BibTeX

@misc{warmtransfer-cisco-cat9300-1718-voice-vlans,
  title  = {VLAN Configuration Guide, Cisco IOS XE 17.18.x (Catalyst 9300 Switches) - Configuring Voice VLANs},
  author = {{WarmTransfer}},
  year   = {2025},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cat9300-1718-voice-vlans},
  note   = {Cisco Systems, accessed 2026-10-02}
}