Routing protocol classes
There are three classes of routing protocols:
· Distance vector
·
Link state
·
Hybrid
Distance vector
the distance vector
protocol is used to find the best path to a remote network by judging distance.
In RIP routing, each instance where a packet goes through a router is called a
hop, and the route with the least number of hops to the network will be considered the best one. The vector indicates the direction of the remote
network. RIP is a true distance-vector routing protocol and periodically sends
out the entire routing table to directly connected neighbors.
Link state
Link-state protocols also called
shortest-path first protocols, each router creates three separate tables. One of
their tables keeps track of directly attached neighbors, one determines the topology
of the entire internetwork, and one is used as the routing table. Link-state
routers know more about internetwork than any distance-vector routing
protocol ever could. OSPF is a true link-state routing protocol. Link-state protocols
send updates containing the state of their own links to all other directly connected
routers on the network. And this is then propagated to their neighbors.
Hybrid
Hybrid protocols
use aspects of both distance-vector and link-state protocols, and EIGRP is a great example- it is typically just called EIGRP
an advanced distance-vector protocol.
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