Lecture 10: BGP (Feb 24)

Today's lecture started off with the introduction of Lab 2 and the requirements for that lab. We then began a discussion about BGP and what it entails. BGP is essentially a protocol for subnets to announce "I am here." Routers will exchange routing information with each other in order to learn the reachability of other routers. BGP actually consists of two separate protocols, one that is internal to the asynchronous system and then one for inter-AS communications. We have these different protocols because we want the inter-AS routing to focus on policies while the intra-AS routing can focus on performance.