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Cisco 4503 unexpectedly reload "System returned to ROM by watchdog timer expired"

Unanswered Question
Aug 6th, 2014
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In five days the router made two unexpectedly reloads with the following message:

show ver            

Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-IPBASE-M), Version 12.2(52)SG, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2009 by Cisco Systems, Inc.

Compiled Tue 12-May-09 16:47 by prod_rel_team

Image text-base: 0x10000000, data-base: 0x11B8F004

ROM: 12.2(31r)SGA2

Dagobah Revision 226, Swamp Revision 34


4500 uptime is 1 hour, 6 minutes

System returned to ROM by watchdog timer expired

System restarted at 09:21:23 UTC Tue Aug 5 2014

System image file is "bootflash:cat4500-ipbase-mz.122-52.SG.bin"


cisco WS-C4503-E (MPC8245) processor (revision 10) with 262144K bytes of memory.

MPC8245 CPU at 266Mhz, Supervisor II+

Last reset from Watchdog

3 Virtual Ethernet interfaces

96 FastEthernet interfaces

2 Gigabit Ethernet interfaces

511K bytes of non-volatile configuration memory.



The flash dont have crash info, the logging dont have any information.


The only thing that is different from the first unexpectedly reload is the configuration of some interfaces and ISE configuration, example:


aaa authentication login default local
aaa authentication enable default enable
aaa authentication dot1x default group ISE
aaa authorization network default group ISE
aaa accounting dot1x default start-stop group ISE

interface FastEthernet2/4

 description 802.1x Enabled
 switchport mode access
 authentication host-mode multi-host
 authentication order mab dot1x
 authentication priority mab dot1x
 authentication port-control auto
 dot1x pae authenticator
 dot1x timeout tx-period 3
 spanning-tree portfast
 spanning-tree bpduguard enable





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