BGP for Cisco Networks: A CCIE v5 guide to the Border Gateway Protocol ( Cisco CCIE Routing and Switching v5.0 Book 1) eBook : Fordham, Stuart: Amazon.co.uk: Kindle Store
Understand Load Share with BGP in Single and Multihomed Environments - Cisco
Sample Configuration for BGP with Two Different Service Providers (Multihoming) - Cisco