Redistribute connected

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I'm a bit confused about this:

Say you have three routers: R1, R2 and R3 like below:

R1---------R2----------R3

For sake of argument, you configure EIGRP on R1 with an AS of 101. You configure IGRP on R3 with an AS of 102.

In order to ensure convergence between all three routers, you configure redistribution on R2.

R2(config)#router eigrp 101
R2(config-router)#network 201.21.21.0
R2(config-router)#redistribute connected
R2(config-router)#router igrp 102
R2(config-router)#network 10.0.0.0
R2(config-router)#redistribute connected
R2(config-router)#^Z

Question: Do you need to configure redistribution on all three routers or just the middle one (R2) ?