Hi Group,

In this simple environment:

       172.10.12.0/25
R1----------------------------R2

I run RIPv1 between R1 and R2, the network in between is 172.10.12.0/25,  on
R1 I have loopback0 which is 172.10.0.1/32 and another network 172.10.11.0/28
directly connected, I saw R1 distributes route 172.10.0.1/32 to R2, but not
172.10.11.0/28.

I understand that 172.10.11.0/28 should not be distributed, but why /32 route
is distributed,  on R2 I saw route 172.10.0.1/32, how does R2 correctly know
the mask is 32 bits, for I run RIPv1, packet doesn't carry mask.

I also tried redistribute other /32 routes from OSPF to R1, R1 also
redistribute them to R2, why /32 routes are always redistributed out by RIP.

The versions are all 12.0.

Thanks,
Jerry




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