i'm having issues creating a backup for an MPLS line. There are two switches (4500 and 6500) connected via two links; an MPLS link (Primary), and an ADSL via the Internet (Backup). Please find sample of the topology:
4500->877 (dialer interface)->INTERNET->PIX->6500
Both the primary/Backup interfaces on the 4500 are in the same VLAN, and same with the 6500. Both ends are running EIGRP.
this is what i did. I created a GRE tunnel across the ADSL and the 6500, so i could advertise EIGRP to the other end via the GRE tunnel. But to my surpise, the link just flapping on the gre tunnel (route recursion) as soon as i advertise them in eigrp. Please do advice me on the best way i could go about advertising eigrp across both links and making the ADSL line the backup link. Thanks.