Remember that your border routers will have interfaces in at least two different ASes. (Typically, their LAN interfaces will be in your AS and their serial ports will be in your ISP's ASes.) Use this to your advantage!
When configuring BGP from a telnet session to a router (i.e. not from the console port), configuration changes may cause temporary or permanent loss of communication with the router. Hence it's a good idea to have telnet connections to interfaces in each of your border routers ASes. Make sure that at least one connection that does not pass through your border routers.
Need figure here showing border router and two telnet sessionsNeeds flesh.
Tips for making seamless transitions Try just a few routes first Get your 2nd ISP to run BGP before your first Have "cold standby" ports configured before router swaps Tips for re-addressing networks and hosts
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