Overview

Internet is devided into autonomous systems (AS)
same administrative domain
internal vs. external view
aggregate prefixes

EGP (exterior gateway protocol)
Exchange prefixes between AS
Default free zone
185'000 routes and growing
Traffic engineering -> filtering
Only used protocol BGPv4
IGP (interior gateway protocol)
Routing table calculation inside an AS
Fast reaction to changes
Neighbor discovery
Protocols OSPF, IS-IS, RIP