Tech Note: Rip Auto Summarize

Another good Tech note if you are studying for CCNA exam

Rip just auto summarize when it crosses a different network boundary which means that if the networks has the same major network then the auto summarize wont happen

The other thing is that they all must share the same subnet mask

So Ex.1

10.1.10.0/24|-----R1<---192.168.1.0/30---->R2<----192.168.1.4/30---->R3----|10.2.20.0/24

here R1 will sned an update to R2 with Network 10.0.0.0
(As its a cross a diff. class boundary/ diff.network)

Ex.2

10.1.10.0/24|-----R1<---10.16.3.0/30---->R2<----10.16.3.4/30---->R3----|10.2.20.0/24

here R1 wont send an update to R2 !!!, Its the same class boundary , using the same Major network 10.0.0.0 but the update will be supressed, AS the out going int. have a DIFFERENT SUBNET MASK /30


Ex.3

10.1.10.0/24|-----R1<---10.16.3.0/24---->R2<----10.16.4.0/24---->R3----|10.2.20.0/24

NOW , the network will work fine, you will see that R1 will recive an update with 10.2.20.0 ,10.16.3.0 &
10.16.4.0 and the interface on R1 thats will recive the updates will apply a mask of /24 on them.