I currently have a Cisco 7613 router with an OC-12 running into it. It's a Packet Over SONET frame relay connection to our ISP who handles the BGP on their end.
We are upgrading to an OC-48 as well as adding an OC-48 card to the router and would like to keep the OC-12 and it's existing card as well for redundancy . I'm new to high end networking and need a nudge in the right direction. What types of protocols/configuration options (or even hardware)should I be looking at to allow me to use the OC-48 as my primary connection and send any overflow through the OC-12. Also in the event the OC-48 were to go offline the OC-12 would take over as the primary and handle as much traffic as possible. As a secondary "nice to have" I would like to be able to route traffic from one of our class C networks out to the internet out just through the OC-12.
