Flashcards

BGP

M KB Networks English 8 cards

Cards in this deck (8)

1Autonomous SystemA group of networks and routers controlled by a single administrative
authority
2Autonomous System ConceptEach collection of networks and routers managed by one administrative authority is considered to be a single autonomous system that is free to choose an internal routing architecture and protocols.
3Practical Limit on Group SizeIt is safe to allow up to a dozen routers to participate in a single routing information protocol across a wide area network;
Approximately five times as many can safely participate across a set of local area networks.
4Exterior Gateway Protocol (EGP)Any protocol designed to exchange routing and reachability information among autonomous systems on the Internet
5EGP solves two problems:Allows router outside a group to advertise networks hidden in another autonomous system
Allows router outside a group to learn destinations in the group
6Border Gateway Protocol (BGP)Basically the only EGP still in existence
Each AS designates a border router to speak on its behalf
Two border routers become BGP peers
7Key characteristics of BGPProvides inter-autonomous system communication
Propagates reachability information
Follows next-hop paradigm
Provides support for policies
Sends path information
Permits incremental updates
Allows route aggregation
Allows authentication
8Key restriction on an EGPAn exterior gateway protocol does not communicate or interpret distance metrics, even if metrics are available.