I have a recently deployed stack of 3 5548P switches. I'm having some issues when trying to supply power to Ruckus 7372 wireless APs: in some ports, the APs will power on, and transit data exactly as expected. In other ports, the APs never show power.
In most of the ports that will not power a Ruckus AP, I can power a Meraki MR12. Except for one tested port: where the experience is that the MR12 power light does a very rapid flicker, and none of the port's lights on the switch light up. (Switches are in production, not all ports can be tested for PoE)
This power problem was first observed under firmware 4.0.1.11, and continues through an upgrade to 4.1.0.8.
I have carefully compared PoE configuration between working and non-working ports, and see no difference. No Power Limit threshold that could be exceeded, no port locking, Green Ethernet Config is the same.
The only PoE devices attached to the stack are 2 other Ruckus 7372s, each pulling 3Watts, from different switches. This is not a total power budget problem.
With a 7273 plugged into a port, I can refresh System: General PoE: <that port> and see the Invalid Signature Counter steadily increasing.
Can anyone provide some troubleshooting ideas to help my 5548 and Ruckus gear get along properly?