I have a Cisco 4506 chassis with (4) 48 port switch modules in it. It is on a known good UPS, has redundant power supplies and everything. About six weeks ago, the switch restarted itself for no known reason. I couldn't find anything out of the ordinary ... it just came back online by the time I got to the switch room.
Today, It happened right at 3:00pm. Reports that I got had some people losing power to the Cisco phones (PoE) and others claimed the phone didn't lose power but the display said ethernet connection lost. The phones losing power were on switch module 3.
I went into the IOS and did a sh hardware and got this:
Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-IPBASEK9-M), Version 15.2(2)E5, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Thu 02-Jun-16 03:28 by prod_rel_team
ph-4506 uptime is 1 hour, 0 minutes
System returned to ROM by reload
System restarted at 14:58:59 CDT Wed Sep 20 2017
System image file is "bootflash:cat4500e-ipbase
Darkside Revision 4, Nexu Revision 9, Fortooine Revision 1.40
Last reload reason: reload
My question is, what else can I do from a troubleshooting standpoint? Is it possible that just switch module 3 in the chassis lost power and the rest of the modules remained online? I am having to accept end-user answers that some Cisco PoE phones lost power and some did not. No one else has access to the switch to reload it so I can only assume it lost power for some reason and "reload" is just a generic reason. Is there a different "Last reload reason" message if it just loses power?
Any pointers on figuring out what happened?