RIP doesn't allow to specifically put network statement unlike ospf and newer verison of EIGRP. If for example r1's s0 is running rip, and s1 will be running ospf in the future. r1's s0 is connected to another r2. so r1 config int s0 ip address 170.1.100.0 255.255.255.0 int s1 ip address 170.1.200.0 255.255.255.0 router rip network 170.1.0.0 now r2 will have a network entry of 170.1.200.0 which I don't want to be a rip route, because of the classfull network feature, r2 will quietly accept that route. The passive interface in the topology wouln't work since the nature of the passive in only one way, recieve, but don't advertise. The only solution I think would be to use distribute list on r2 not to accept the 171.1.200.0 route. What should be the approach in ccie lab if no instruction are given. I would filter it regardless of instructions, what you guys would do. Thanks, Teza
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