Other Issues

• Communicating across the AS

• • All border routers in an AS typically know about all other border routers within the AS
  • • A fully-connected graph
    • Large amounts of manual configuration

• Duplicate paths to an AS?

• • Routing decisions can be based on arbitrary policy
  • • Hop distance
    • Politics
    • Economics
    • Etc.

• IPv6 deployment

• • Even with route aggregation, inter-domain routing tables may grow enormous