I have a troubleshooting issue of which I require a little help with.
At our main office, I have a Cisco 1941 router as our primary router. It performs our base routing between multiple internal networks, as well as NAT & Inspection for WAN traffic, and VPN terminations. For our WAN, we have a wireless point to point connection with one static public IP. The WAN connection on the 1941 (int ge0/0) physically connects directly to our ISP's wireless radio, of which i do not have access to any management interface.
For the most part, the 1941 router has been running great. Im still trying to figure out the whole traffic monitoring/top n flows thing, but that is me, not the router.
Ive been noticing in the 1941 logs, that the WAN interface, int ge0/0 has been changing states from up to down, and then down to up. The downtime averages 2 - 5 seconds every time. The occurance rate is about 2-3 times a day (average), at random times between days but during the same hour for a given day. This also only appears to occur during business days and during business hours.
I have checked and re-checked the physical connection from int ge0/0 to the ISP radio, and the power for the ISP radio. I have also submitted a trouble ticket with our ISP, to see if there is a way I or they could access any kind of log on their radio, to see if it indicates any kind of source to this problem. Our ISP sadly informed that their radio does not record such logs, however, they are now monitoring our connection for negotiation updates.
My question is, where do I go from here? How do I determine the source of this problem? Is there a way to have the 1941 log any more information as to why the interface changes state? What else could cause this?
I've attached my current running config for the 1941 router in question. Any passwords and public IP's have been "xx"'ed out.
Any help would be greatly appreciated, as I am not sure what to do from here.