This is an old version of the compendium, written May 27, 2017, 7:29 p.m. Changes made in this revision were made by eivind_. View rendered version.

TTM4180: Nettverkshåndtering

##Nettverkslaget og linklaget ##SDN ### Historie ### Hva er SDN ### Motivasjon ### Kontroller ### Openflow ##Ruting protokoller ###RIP ###Open Shortest Path First (OSPF) ##Border Gateway Protocol (BGP) ###Path attributes ####AS-path ####Local preference ####Origin ####Next hop ####Weight

###BGP States ####Idle The router isn't trying to set up a BGP session, and if the neighbor were to attempt to create a session, the TCP connection would be refused. The router waits for a "start" event, typically the user enabling BGP or adding a neighbor or an interface coming up. ####Connect In this state, the router waits for its own TCP session establishment attempt to complete, and it listens for incoming TCP sessions ####Active BGP is waiting for a TCP session ####OpenSent The open message has been sent, but an open message hasn't yet been received from the neighbor. ####OpenConfirm The open message from the neighbor has been received, but not yet the initial keepalive message that completes the BGP session setup phase. ####Established The initial keepalive message has been received, and the session is now ready for transmission of update, keepalive, and notification messages. ###Routing Information Base (RIB)

A routing table will only store one route per destination, while the RIB usually contains multiple routes. The RIB keeps track of routes that could possibly be used. If a route withdrawal is received and it only existed in the RIB, it is silently deleted from the RIB. No update is sent to peers. RIB entries never time out. They continue to exist until it is assumed that the route is no longer valid.