ospf, like is-is is a link state
protocol...both are based on dijkstra's algrithm, also known as
distributed database protocols, each router originates information
about itself, it's directly connected links, and states of those
links... thus link state... they pass this information and make copies
of it between routers, but never change it... this makes for identical
views of the overall network topology...
an
older definition of eigrp is that it is a hybrid routing protocol;
sharing the best qualities of distance vector and link state....
actually there are no link state qualities to eigrp and it has more
correctly come to be known as an "advanced distance vector" protocol
based on a distributed form of the bellman-ford algorithm... vectors of
distance are exchanged between nodes, and resultant distances between
nodes, but an overall picture of the topology is not assembled, as in
link state...
as
jeff doyle puts it, "distance vector is a road sign while link state is
a road map", in his book which compares ospf and isis...
network cisco ccna gns3 certification arteq
a network runs through it
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