Inter-Domain routing Used to route packets across different Ass Options: Static routing-manually configured routes Distance-vector routing Exterior Gateway Protocol (EGP) Border Gateway Protocol (BGP) Issues What cost"metric"to use for Distance-Vector routing Policy issues: Network provider A may not want B's packets routed through its network or two network providers may have an agreement Cost issues: Network providers may charge each other for dlivery of packets y"°Eytan Modiano Slide 18 Inter-Domain routing • Used to route packets across different AS’s • Options: – Static routing - manually configured routes – Distance-vector routing Exterior Gateway Protocol (EGP) Border Gateway Protocol (BGP) • Issues – What cost “metric” to use for Distance-Vector routing Policy issues: Network provider A may not want B’s packets routed through its network or two network providers may have an agreement Cost issues: Network providers may charge each other for dlivery of packets