Source note · Voice VLAN and LLDP-MED and CDP and PoE for IP phones
Inference: on a Catalyst 9300 left at documented defaults, a non-Cisco phone that learns its VLAN only through LLDP-MED will not get a voice VLAN until LLDP is enabled globally (lldp run), because CDP is on by default and LLDP is off.
inferred · Checked 2026-09-24
- Vendor
- Cisco
- Product
- Catalyst 9300 Series Switches
- Subsystem
- LLDP-MED / voice VLAN
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.15.x to 17.17.x
- Status
- inferred
- Checked
- 2026-09-24
Sources
- Interface and Hardware Components Configuration Guide, Cisco IOS XE 17.17.x (Catalyst 9300 Switches) - Configuring LLDP, LLDP-MED, and Wired Location Service — Cisco Systems · tier 2 current vendor documentation · Default LLDP Configuration (table), combined with cisco-cat9300-1715-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-infer-c9300-lldp-for-3p-phones. WarmTransfer. https://warmtransfer.net/knowledge/claims/voice-vlan-lldp-poe-infer-c9300-lldp-for-3p-phones
BibTeX
@misc{warmtransfer-claim-voice-vlan-lldp-poe-infer-c9300-lldp-for-3p-phones,
title = {Voice VLAN and LLDP-MED and CDP and PoE for IP phones: source note voice-vlan-lldp-poe-infer-c9300-lldp-for-3p-phones},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/voice-vlan-lldp-poe-infer-c9300-lldp-for-3p-phones},
note = {Source note voice-vlan-lldp-poe-infer-c9300-lldp-for-3p-phones, checked 2026-09-24}
}