Help with configuring RIP v 2

mikejj83

I am studying for the CCENT and a little confused as to entering network statements for RIP v2. I know RIP v2 is a classless protocol but am confused as to when I enter networks if I should enter them in their classfull form. I have seen conflicting info.

For example, if I have a router with two serial interfaces that I want to enable rip on and the IP’s are 10.1.1.1 and 172.1.1.1 would I enter the following network statements under RIP v2:
Network 10.0.0.0
Network 172.1.0.0
Or would I enter the entire IP addresses? Also would I then need to enter the no autosummary command so the networks are advertised with their full length IP’s?

kalebksp

R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#router rip
R1(config-router)#network 1.1.1.1
R1(config-router)#do show run
...
router rip
 network 1.0.0.0
...

You can enter the network command with the classless network address, but it'll truncate it down to the classful network. When doing an exam I would enter the classful address.

kalebksp

mikejj83 wrote: »

Also would I then need to enter the no autosummary command so the networks are advertised with their full length IP’s?

Yes. Keep in mind that auto-summary only applies when crossing classful network boundaries. So if a router was going to advertise the network 10.1.1.0/24 across the link 192.168.1.0/24 it would be summarized, but if it were to be advertised across the link 10.2.2.0/24 it would not be summarized.

Bl8ckr0uter

kalebksp wrote: »

Yes. Keep in mind that auto-summary only applies when crossing classful network boundaries. So if a router was going to advertise the network 10.1.1.0/24 across the link 192.168.1.0/24 it would be summarized, but if it were to be advertised across the link 10.2.2.0/24 it would not be summarized.

That is really good to know. Rep for you.