Introduction to Protocols and Routing
117237-E Rev.00
1-15
IP Routing Information Protocol
One of the protocols used to build and maintain this picture of the
network is the Routing Information Protocol (RIP). This is a
distance vector protocol, which means that all the decisions
about which path to use are based upon the distance between
source and destination.
How RIP Works
A router using RIP would first look at directly attached networks,
and these would be considered to be 1 hop away. Other networks
which are further away (that is, not directly attached) would be n
hops away, where n is the number of hops needed to reach the
more distant network. If there are multiple paths to a network, the
path with the least number of hops is chosen as the best path, and
all other information about how to get to that network is
discarded.
Using RIP, the routers on each network update each other every
30 seconds and check to see if there is any new information that
should be added to the routing table. The entries in a routing table
are allowed to remain for 180 seconds. If no information about a
remote network is received in this time, the destination network is
marked as unreachable and removed from the routing table.
Communication New Routing Information
An important consideration is how long it takes for a change to
the routing topology (such as link or node failure) to be
transmitted through the entire RIP network environment. This
process is called convergence, and it is important that it occurs as
fast as possible so that all routers have correct information about
the changed network in their tables.
Using RIP, convergence takes place 1 hop at a time throughout the
entire network, with new routing information being passed from
one hop to another using the 30-second routing information timer.
So, to prevent this taking too long, RIP is limited to 15 hops
maximum.
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