Cisco Switches :: SG300-28P - POE Power Drops Every Several Minutes

Sep 10, 2012

We have an SG300-28P which, at intervals between 5 and 30 minutes or so, drops power to all of its POE-powered ports and then immediately restores power. The switch logs nothing when this happens other than recording that the ports went down and back up, even with debug logging enabled. Non-POE ports are not affected.
 
When the problem started there were only four POE-powered devices on the switch and we are far under our power budget. (While testing I added a fifth device, see below.)
 
Not all combinations of devices cause the drops to occur -- specifically, it looks like having devices on ports near each other causes the drops. When the drops occur, the absent counters of all of the POE devices increment. I noticed this earlier thread here seemed similar: [URL]
 
but in that case, he got no power at all in the adjacent configurations, instead of having it drop every several minutes.
 
I'm running
 
sw06#sh ver
SW version    1.1.2.0 ( date  12-Nov-2011 time  23:34:26 )
Boot version    1.1.0.6 ( date  11-May-2011 time  18:31:00 )

[Code].....

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Below is the blog I started for InterVlan issue [URL]
 
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This is what I see on our switch.
 
Our switch version
switchd64684#show version                                                                                                                                              
SW version    1.1.0.73 ( date  19-Jun-2011 time  18:10:49 )
Boot version    1.0.0.4 ( date  08-Apr-2010 time  16:37:57 )
HW version    V01

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3COM Setup
#
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[Code].....

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Model: A90-210030-04

DSL Statistics
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Data Path: Interleaved

[code].....

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