On Catalyst 9300, the initial PoE allocation for Class 0, 3 and 4 powered devices is 15.4 W. A device that asks for more over CDP or LLDP after startup can be given up to 30 W.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco Catalyst 9300 Series Switches
- Subsystem
- PoE
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.11.x
- Checked
- 2026-10-02
Sources
- Interface and Hardware Components Configuration Guide, Cisco IOS XE Dublin 17.11.x (Catalyst 9300 Switches) - Configuring Power over Ethernet — Cisco Systems · tier 2 current vendor documentation · Power Negotiation / IEEE classification
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-poe-initial-15w. WarmTransfer. https://warmtransfer.net/knowledge/claims/ip-phone-dhcp-vlan-troubleshooting-poe-initial-15w
BibTeX
@misc{warmtransfer-claim-ip-phone-dhcp-vlan-troubleshooting-poe-initial-15w,
title = {Troubleshooting IP phones that do not get a voice VLAN or DHCP options: source note ip-phone-dhcp-vlan-troubleshooting-poe-initial-15w},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/ip-phone-dhcp-vlan-troubleshooting-poe-initial-15w},
note = {Source note ip-phone-dhcp-vlan-troubleshooting-poe-initial-15w, checked 2026-10-02}
}