I also experinced some what similar problem with 2600 series router. You should note whether router is able to boot ios properly or not. I suggest you to upgrade your ios to a latest version, your platform supports.
In another case I had a permanant console connection to router from NT machine. Whenever NT machine restarted, surprisingly it also rebooted router. When I removed router console cable from NT box, problem disappeared.
I would also bring up a SYSLOG server on an NT workstation and see what that tells you. I had a situation before where our routers were rebooting themselves periodically, after bringing up a SYSLOG server I found out that there was a memory leak problem in the IOS that I was using.
logging buffered 16384
logging trap debugging
There are several NT SYSLOG Servers out there that you can at least demo for free. The one I use was $35. Before you change the router make sure that the SYSLOG machine is setup, also when you are done I would change the command above 'logging trap debuging' to 'logging trap informational' to reduce the messages that are generated.
I've seen this on several platforms, it was always because of memory problems:
- not enough flash causes the IOS image to corrupt, which causes reboots systematically (I've had a 3640 with a faulty flash card which reacted exactly the same)
- not enough ram makes it impossible for the IOS image to decompress, so it reboots
By issuing a break within 60 seconds after a reboot, you can enter Rom monitor mode, so you can check config-register, IOS image location & size, you can force the router to use a different image on a tftp server or a PCMCIA flash card etc.
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