Discussion

See Also
Recipes 7.5 and 8.1
10.2 Having RIP Advertise Its Routes
Problem
You want your RIP-enabled router to share routes with its neighbors and learn routes
from them.
Solution
To have RIP advertise RIP routes to its neighbors, you need to configure a routing
policy that accepts all RIP packets:
[edit policy-options]
aviva@RouterA# set policy-statement advertise-rip-routes term 1 from protocol direct
aviva@RouterA# set policy-statement advertise-rip-routes term 1 from protocol rip
aviva@RouterA# set policy-statement advertise-rip-routes term 1 then accept
user@router1# show
policy-options {
policy-statement advertise-rip-routes {
term 1 {
from protocol [ direct rip ];
then accept;
}
}
}
Then you apply the policy to all updates sent by RIP:
[edit protocols rip]
aviva@RouterA# set group alpha-rip-group export advertise-rip-routes
Discussion
When you simply enable RIP, the default JUNOS behavior is to only receive RIP traffic
but not learn any of the routes or send any RIP routes. To have RIP send routing
information to its neighbors, you need to configure a routing policy that has RIP
export routes to its neighbors. An easy way to do this is to have RIP send both the
direct and the RIP routes it knows about. Sending the RIP routes is obvious, but why
do you need to send the direct routes? Direct routes, which are routes directly to a
subnet, are automatically created when you configure the subnet on an interface
address. Because RIP does not exchange routes by default, when you first configure
RIP on your network, your routers might not have learned any RIP routes. You use
the direct routes to catalyze the route-learning process. Once the RIP routers have
exchanged direct routes, they can start to exchange their RIP routes.
338 | Chapter 10: RIP
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