Source note · Voice VLAN and LLDP-MED and CDP and PoE for IP phones
On Catalyst 9300 (IOS XE 17.15.x), CDP must be enabled on the port connected to a Cisco IP phone for the switch to send it the voice VLAN configuration, and CDP is globally enabled by default on all interfaces.
Checked 2026-09-24
You must enable CDP on the device port connected to the Cisco IP Phone to send the configuration to the phone. (CDP is globally enabled by default on all device interfaces.)
- Vendor
- Cisco
- Product
- Catalyst 9300 Series Switches
- Subsystem
- voice VLAN / CDP
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.15.x
- Checked
- 2026-09-24
Sources
- VLAN Configuration Guide, Cisco IOS XE 17.15.x (Catalyst 9300 Switches) - Configuring Voice VLANs — Cisco Systems · tier 2 current vendor documentation · Configuring Voice VLANs > Prerequisites for Voice VLANs
Cite this note
APA
WarmTransfer. (2026, September 24). Voice VLAN and LLDP-MED and CDP and PoE for IP phones: source note voice-vlan-lldp-poe-c9300-vv-cdp-required. WarmTransfer. https://warmtransfer.net/knowledge/claims/voice-vlan-lldp-poe-c9300-vv-cdp-required
BibTeX
@misc{warmtransfer-claim-voice-vlan-lldp-poe-c9300-vv-cdp-required,
title = {Voice VLAN and LLDP-MED and CDP and PoE for IP phones: source note voice-vlan-lldp-poe-c9300-vv-cdp-required},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/voice-vlan-lldp-poe-c9300-vv-cdp-required},
note = {Source note voice-vlan-lldp-poe-c9300-vv-cdp-required, checked 2026-09-24}
}