CSCwk58506 - Some non fully IEEE compliant devices is not getting PoE

[sandrey]

I have a IP desk phone ( Yealink MP54 ), it works correctly on Catalyst 3650 and C9300L, but on Catalyst C9300LM-48UX-4Y running IOS-XE 17.09.04 or 17.12.04, I need the workaround "power inline port 1-event" on the interface !

Is this a bug on the C9300LM or is this model more strict  ?

[Leo Laohoo]

This is a known bug feature.

[sandrey]

More info ...

• Same issue with a Yealink MP56 on Catalyst C9300LM-48UX-4Y running IOS-XE 17.09.04 or 17.12.04
• No problem on C9300L-48UX-4Y running IOS-XE 17.09.04 or Catalyst 3650
• No issues with other PoE devices

[mikenata]

have you enabled the below: 

hw-module slot <slotnumber>  upoe-plus

[sandrey]

No, Catalyst C9300LM-48UX-4Y are UPOE not UPOE+ !

[mikenata]

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/17-11/configuration_guide/int_hw/b_1711_int_and_hw_9300_cg.pdf
The Cisco Universal Power Over Ethernet (UPOE) feature provides the capability to source up to 60W of power (2 x 30 W) over both signal and spare pairs of the RJ-45 Ethernet cable by using the Layer 2 power negotiation protocols such as CDP or LLDP. An LLDP and CDP request of 30 W and higher
in the presence of the 4-wire Cisco proprietary spare-pair power type, length, and value descriptions (TLV) can provide power to the spare pair.
When enabled in IEEE 802.3bt mode, Cisco UPOE devicesfunction as 802.3bt Type 3 devices,supporting up to Class 6 (see Table 20: IEEE Power Classifications in the document) on every port.

Only the following UPOE switches are IEEE 802.3bt-complaint Type 3 devices:
• C9300-24U
• C9300-48U
• C9300-24UX
• C9300-48UXM
• C9300-48UN
• C9300L-24UXG-4X
• C9300L-24UXG-2Q
• C9300L-48UXG-4X
• C9300L-48UXG-2Q
• C9300LM-24U-4Y
• C9300LM-48U-4Y
• C9300LM-48UX-4Y