Cisco's Catalyst 9300 LLDP guide says LLDP must be disabled on interfaces where CDP is used for power negotiation.
Checked 2026-10-02
it is necessary to disable LLDP on interfaces where Cisco Discovery Protocol is in use for power negotiation
- Vendor
- Cisco
- Product
- Cisco Catalyst 9300 Series Switches
- Subsystem
- PoE
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.7.x
- Checked
- 2026-10-02
Sources
- Interface and Hardware Components Configuration Guide, Cisco IOS XE Cupertino 17.7.x (Catalyst 9300 Switches) - Configuring LLDP, LLDP-MED, and Wired Location Service — Cisco Systems · tier 2 current vendor documentation · LLDP and Cisco Discovery Protocol coexistence
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting IP phones that do not get a voice VLAN or DHCP options: source note ip-phone-dhcp-vlan-troubleshooting-lldp-off-for-cdp-power. WarmTransfer. https://warmtransfer.net/knowledge/claims/ip-phone-dhcp-vlan-troubleshooting-lldp-off-for-cdp-power
BibTeX
@misc{warmtransfer-claim-ip-phone-dhcp-vlan-troubleshooting-lldp-off-for-cdp-power,
title = {Troubleshooting IP phones that do not get a voice VLAN or DHCP options: source note ip-phone-dhcp-vlan-troubleshooting-lldp-off-for-cdp-power},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/ip-phone-dhcp-vlan-troubleshooting-lldp-off-for-cdp-power},
note = {Source note ip-phone-dhcp-vlan-troubleshooting-lldp-off-for-cdp-power, checked 2026-10-02}
}