RIPv1

Question:

suppose we have WS-C3560X-24T-L the following diagram with ripv1 enabled

RIPv1 does not send the mask. so R2 will see in the update message a route to 192.168.1.0 that is less specific than 192.168.1.128/25

so why it will not add it to its routing table as 192.168.1.0/24 so that it will have 2 routes :

R  192.168.1.0/24   via 192.168.0.1

C  192.168.1.128/25  via e0

this will not make any confusion for R2

Answer:

When R2 receives the update it will see if it is in the same major network as the receiving interface which is not the case here( it receives a 192.168.1.0 and it is connected to 192.168.0.0) so it checks if any subnets of the received network already exist in the rib and it is the case here with 192.168.1.128/25 and so it ignores the update

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