Router goes down at 9am

[suedaisy]

I have an extremely strange issue that I have no idea where to even begin with.
We have a Cisco 2621 Router with a SonicWall firewall. Everyday at 9am, the Fast Ethernet 0/0 turns either administratively down or just becomes down, and of course we don't have any Internet, but the network still functions. The other Fast Ethernet is left untouched and stays on with no problems.
If I reboot the router (whilst unplugging the firewall and then replug) then it'll come back up for about 5 minutes and then it's down again. This will happen til 10:30am... and then the system stays up.
There's no access rules for any times on the firewall, and I haven't read about this capability in Cisco.
This doesnt happen during the weekend either, just Mon-Fri, and it began on Fri morning. The only change that was made was Wed when our router guy came out here and reconfigured like it was brand new out of the box, in order to put the firewall on.
I'm just really looking for a direction to begin with on how to fix this issue. The router guys said its a router problem and we need it replaced, but if this is the case, why is it so timely in going down and then coming back?
Any help is greatly appreciated.

 

[NetEng631]

I had an SNMP problem once, where everytime we polled the interface the router would reboot. I know we had to do an IOS upgrade to fix the problem. This was years ago. This may help on your 7206 issue. It could be worth a shot and maybe what TAC tells you to do anyway.

NetEng

 

[suedaisy]

I thought the same thing commsguy. Now our network is set up like this: from T1 to router to firewall to hub. is that right? I was told the firewall and router should be switched.
NetEng, Cisco basically said that it seemed like the right configuration for the Cisco side of it, and that we would have to look how the sonicwall is config'd. sonicwall said our config is just fine and we should look at the cisco config. crazy huh?
We're just going to go back to how we were before.. no sonicwall and PIX is going back on. ill just have to learn the cisco a bit better to check logs and whatnot.
think that new virus has anything to do with it? we're being hit by it about every 10 seconds.

 

[commsguy]

topology with firewalls is often complicated. if the T1 isn't terminated on the router, that may be ok, otherwise you may need a second router.



commsguy

http://www.convetech.com