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POE system reset on 1238 with R11.4.4

Hi all,

We're using a lot of NetVanta 1238 PoE switches, running AOS R11.4.4 for some reason.

A fairly frequent issue is that the POE system think too much power is drawn and restarts itself:

27-09-2019 13:24:47 Local7.Warning Sep 27 12:24:47 KCNS0502 POWER_OVER_ETHERNET: Total Power Used (6116.007W) has entered the guard band (351W).

27-09-2019 13:24:47 Local7.Error Sep 27 12:24:47 KCNS0502 POWER_OVER_ETHERNET: The PoE hardware has reset, reinitializing...

27-09-2019 13:25:19 Local7.Warning Sep 27 12:25:19 KCNS0502 POWER_OVER_ETHERNET: Total Power Used (33.004W) has exited the guard band (351W).

There's only a few wifi APs on it, so the ~33W is accurate, but that 6116W is just crazy.

Tried to go through the release notes since R11.4, but couldn't yet locate an entry that relates to this.

I'm kinda expecting to be told to just upgrade the switches to something recent, but with change management it'd make life a lot easier if I could just point to a document saying it was fixed in Rxx.yy, so we need to go above that.

Switch info:

KCNS0502#show version

ADTRAN, Inc. OS version R11.4.4

  Mainline Version: ENM.14.106

  P4 Changelist: 208741

  Checksum: 56FFDFD9

  Built on: Wed Jul  8 13:23:55 2015

  Upgrade key: 48afbdcb1898a8f4565a534afe95b51d

Boot ROM version XB.01.02

  Checksum: DF1E

  Built on: Fri May 25 16:51:16 2012

  Compatibility Version: 0

Copyright (c) 1999-2015, ADTRAN, Inc.

Platform: NetVanta 1238 PoE, part number 1702599G1

Serial number LBADTN1230AH611

Flash: 33554432 bytes  DRAM: 134217727 bytes

Any pointers much appreciated!



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Honored Contributor
Honored Contributor

Re: POE system reset on 1238 with R11.4.4

It sure looks like a software bug. No way they're pulling six kilowatts. 11.4.4 is pretty old firmware, release notes for everything between that and current release are long gone from the Adtran site.

I'd upgrade to the latest extended maintenance release. There have been lots of bug fixes in the four years since that software was released.