AIR-AP3802I-E-K9/CAP2702E-E-K9 Denied power on MS355

[Blake-Larkan]

Performed a cut over from catalyst switches to Meraki MS355. The  catalyst switches had cisco AIR AP's connected which would be moved over to the MS355. Some of the AP's boot up when connected to the MS355 but every now and then some don't. Moved the uplinks from the AP's between uPOE and uPOE+ with no joy. Moved the uplinks from the AP's to a spare catalyst switch and they return online without any issues, although I do notice the ports auto neg to 100 instead of 1000, which does hit at a possible cable issue.

For a brief moment I can see the error on the switch stating "denied power". Currently, there is no way to manually set static power levels on the port level. Is there any known issues or any experience similar occurrences?

[alemabrahao]

Check it out.

Solved: PoE port was denied power - The Meraki Community

[Blake-Larkan]

HI, unfortunately the switch does not show the port as orange indicating that there is at least a device connected to the port. It will briefly show the POE lightening symbol within the port but the port will still show nothing is connected to the port.

On the same switch there AIR-AP3802I-E-K9 and AIR-AP2802I-E-K9 connected. Port 13 and Port 15 are the connected and working AP's. Port 14 and Port 15 are where the other AIR-AP3802I-E-K9 & CAP2702E-E-K9 were connected to but did not power on from the port.

[IvanJukic]

Hi @Blake-Larkan ,

I've seen issues like this in the wild before. Where, for some reason, the PoE client was not sending the PoE Flag in the CDP/LLDP packets to the switch. In those circumstances, was software bug. Something like this;

I would suggest running a packet capture on port 14 & 16. With one of the devices that are working on Port 13 & 15. Then visa versa for the "non working" PoE Clients.

If there is something funky in the pcaps. Raise a Support case for further investigation.

[Blake-Larkan]

Thanks for this! I'll try this out and revert my findings

[PhilipDAth]

What does the switch event log say?

If you have the MS355 run a cable test on the port to the AP what does it say?

[Blake-Larkan]

There is nothing in the logs pertaining to the ports where the AP's were connected to it. 

The switch was powered on, with all the uplinks connected prior. Ports 13 and 15 have AIR-AP3802I-E-K9 and AIR-AP2802I-E-K9 connected and working. Ports 14 and 16 were where the 2 previous AP's that didn't come online were connected.

I did not run a cable test during that time because they were up and working before I performed the cut over. I'll need to get back to you once I can try test this. 

[cmr]

I've had a few issues with PoE devices not getting power on 355s.  Mainly older devices where the CDP or LLDP information doesn't exist or doesn't come through properly.  The newer firmwares have been dealing with this, what version are you running?