Hi Buddies,

RIP and split horizon have a lot of stuff to learn about but I am mentioning one of them which could be handly for a CCIE oint of View.










You can see that I am using four different loopback address on R2 and I have secondary ip address on Fa0/0 also configured in same range but on secondary ip address.
When i have to advertise the below mentioned network on R2 on RIP, i will be using below mentioned commands

router rip
network 20.0.0.0

so when i will open the routing table of R1, i can only see the 20.0.1.0,20.0.2.0,20.0.3.0,20.0.4.0 but 20.0.5.0 will not be there, to advertise secondary ip addresses we have to disable split horizon on those interfaces.

Please let me know, if you do not understand the concept, mail me at rawatmohinder@gmail.com

Thanks
Mahi