The customer router has a two ethernet connections to two routers with same ISP. All three run in same AS. The connecitivty is via BGP nothing else. The customer router is receiving a default route from both ISP routers. It is like a backup. One router is preferred over the another using the MED received by the customer router.
The ISP routers have a serial connection out to the internet. The problem is the ISP main router serial interface (which is one of the customer router is connected) keep flapping. The customer router connection to the ISP routers are stable becuase of ethernect connection. Now I need somekind of solution that if the ISP router serial link is flapping We can control the customer router to switching back to the ISP main router till the link is stable.
I was thinking using Route dampening but it is not goona help becuase we are receiving only one default route.
Hope you guys can under stand what I am tyring to say here.