RIP and RIP version 2 problem

Hi could anyone answer this question please ?

I have a PC connected to a switch connected to a router (router A)

router A is connected via serial to router B

Router B is connected to a PC

Ok, all have class B addresses and I'm running RIP

I change the ethernet 0 address on router A to a class C and change to RIP version 2 on router A.
The routing table on router A now informs me that the ethernet 0 address is now subnetted....

I now change router B to RIP version 2 and clear the routing table.

The new routing table info still says that ethernet 0 on router A is /16

This should change to /24 shouldnt it ?

The debug ip rip command displays that updates are being sent with the /16 mask...why is this ?

Why isnt RIP 2 sending the /24 :

I think you need to disable auto-summarization. To do this execute "no auto-summarization" under router rip mode.