RB5009UG+S+ POE in on eth1 does not work on some POE switches
Router: RB5009UG+S+, RouterOS 7.23.3, connected on ether1, DC adapter
physically disconnected for all tests.
works - Cisco WS-C2960S (802.3at):
Interface Admin Oper Power Device Class Max
Gi1/0/1 auto on 15.4 Ieee PD 4 30.0
Detected, classified class 4, powered, boots normally.
Fails - Cisco WS-C3850-12X48U (UPOE), IOS-XE 16.12.11:
Interface: Gi2/0/26
Inline Power Mode: auto
Operational status: off
Device Detected: no
IEEE Class: n/a
Absent Counter: 0
Over Current Counter: 0
Short Current Counter: 0
Invalid Signature Counter: 0
Power Denied Counter: 0
No ILPOWER log entry for this port, ever. Not a rejection - the switch
behaves as if nothing is connected.
Switch and cable are fine:
- Other PoE devices (incl. a TP-Link Omada AP) power on this exact port
with this exact cable
- Three class-4 PDs powered on the same module right now
- 493W of 600W free
- 10cm patch cable, switch straight to router
- Link comes up at 1Gbps, zero CRC errors
Tried on the Cisco side: power inline auto, static max 30000, 2-event,
shut/no shut, multiple ports including mGig.
Interesting detail: on RouterOS 7.22 it wouldn't power from the 2960-S
either. 7.23.3 fixed that, but the 3850 still doesn't see it at all. So
PoE-in behaviour does seem to be firmware-influenced on this board.
Anyone running an RB5009 off a UPOE or 802.3bt switch successfully? Trying
to work out whether this is my unit or the model.
My goal is to power the mikrotik form the switch like i used to do with my 2960 but on the 3850.