Several of my customers pay for redundant connections to our datacenter. At the customer end is an 1812, setup with EIGRP towards our core 6509.
EIGRP works fine as long as the primary link falls down neatly. The problem is those occurences when the primary link either has packet loss or is in a flapping state (the flapping state isn't noticed on the physical layer of any of the devices under my control, as the flapping is happening somewhere in the cloud of the link provider).
Is there any way I can setup the 1812 and the 6509 to notice packet loss/flapping on the primary link and prefer the secondary link as long as the primary link is in such a state?