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IP Routes and Routing Tables
(Page 3 of 3)
Route Determination
Now, imagine that this process is
expanded to handle thousands of networks and routers. Not only do routers
need to know which of their local connections to use for each network,
they want to know, if possible, what is the best connection
to use for each network. Since routers are interconnected in a mesh
there are usually multiple routes between any two devices, but we want
to take the best route whenever we can. This may be the shortest route,
the least congested, or the route considered optimal based on other
criteria.
Determining what routes we should
use for different networks turns out to be an important but very complex
job. Routers must plan routes and exchange information about routes
and networks, which can be done in a variety of ways. This is accomplished
in IP using special IP routing protocols. It is through these
protocols that R2 and R3 would find out that 14.0.0.0/8 exists and that
it is connected to them via R1. I
discuss these important support protocols in their own section.
Note: There is a difference between a routable protocol and a routing protocol. IP is a routable protocol, which means its messages (datagrams) can be routed. Examples of routing protocols are RIP or BGP, which are used to exchange routing information between routers. |
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Version 3.0 - Version Date: September 20, 2005
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