Your diagram appears to have been hosed by HTML... rather hard to read.
It would be difficult to answer this question without seeing the configs for R2, R3 and R4. Also, you haven't specified your subnet mask, but I'll assume that its always 255.255.255.0 since all of your networks end with .0
If I read your diagram correctly, it looks like R2 e0/0 is RIP2 and the R2 serial is IGRP. The 192.168.4.0 network should be under the IGRP process. RIP and IGRP do not automatically redistribute routes between them but you can set it up that way if you want. Based on your diagram, I don't see a reason for redistribution on R2 unless R2 has other connections not in the diagram.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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