Phones occasionally losing power. Swapping the phone doesn't help - the only way to bring power back is to either shut/no shut the interface, or connect a non-PoE device to the switch, then put the phone back.
We've not established a pattern yet, it seems random.
One thing I've noticed is that when it happens, that port on the switch indicates a Class 0 (15.4w) device, whereas the other phones indicate Class 2. Clearing that port results in renegotiation at Class 2. Perhaps it's a generic problem with af devices? Or a phone firmware problem?
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I'm not sure if this is your problem or not but the 3750-24 can support all ports at full power (15.4w). The 3750-48 can support 24 ports at 15.4 Watts, 48 ports at 7.7 Watts, or any combination in-between.
Cisco phones negotiate the power down to 6.9w via CDP so a 3750-48 can have all ports loaded. Because the Avaya phones don't have CDP they can't negotiate properly.
I'm not sure why they renegotiate when you clear the ports.
You may be hitting a power limitation on the 3750 with the Avaya phones.
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