Source note · Voice VLAN and LLDP-MED and CDP and PoE for IP phones
Inference: turning on 802.3bt mode on an in-service Catalyst 9300 needs a maintenance window, because the command power-cycles the switch and so drops every PoE phone connected to it.
inferred · Checked 2026-09-24
- Vendor
- Cisco
- Product
- Catalyst 9300 Series Switches
- Subsystem
- IEEE 802.3bt mode
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.18.x
- Status
- inferred
- Checked
- 2026-09-24
Sources
- Interface and Hardware Components Configuration Guide, Cisco IOS XE 17.18.x (Catalyst 9300 Switches) - Configuring Power over Ethernet — Cisco Systems · tier 2 current vendor documentation · Supported Protocols and Standards (hw-module switch upoe-plus note)
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-bt-mode-change-window. WarmTransfer. https://warmtransfer.net/knowledge/claims/voice-vlan-lldp-poe-infer-bt-mode-change-window
BibTeX
@misc{warmtransfer-claim-voice-vlan-lldp-poe-infer-bt-mode-change-window,
title = {Voice VLAN and LLDP-MED and CDP and PoE for IP phones: source note voice-vlan-lldp-poe-infer-bt-mode-change-window},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/voice-vlan-lldp-poe-infer-bt-mode-change-window},
note = {Source note voice-vlan-lldp-poe-infer-bt-mode-change-window, checked 2026-09-24}
}