crookbook part 3...

add a loopback on r2, and change the configuration to r3 into a rip network...

r2

int lo4
ip add 4.4.4.4 255.255.255.0

router eigrp 1
no netw 172.16.1.0 0.0.0.255

router rip
netw 172.16.0.0
netw 4.0.0.0

r3

no router eigrp 1

router rip
netw 172.16.0.0
netw 3.0.0.0

r2#sh ip route | ex L | inc loop
    
Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
D        1.1.1.0 [90/2297856] via 10.1.1.1, 01:13:03, Serial2/0
      2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        2.2.2.0/24 is directly connected, Loopback0
R     3.0.0.0/8 [120/1] via 172.16.1.3, 00:00:15, FastEthernet0/0
      4.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        4.4.4.0/24 is directly connected, Loopback4
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, Serial2/0
      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.1.0/24 is directly connected, FastEthernet0/0

redistribute rip into eigrp and eigrp into rip...

r2

router rip
redistribute eigrp 1 metric 5

router eigrp 1
redistribute rip metric 1 0 1 1 1500

r3#sh ip route | ex L | incl loop
      
Gateway of last resort is not set

R     1.0.0.0/8 [120/5] via 172.16.1.2, 00:00:25, FastEthernet0/0
R     2.0.0.0/8 [120/5] via 172.16.1.2, 00:00:25, FastEthernet0/0
      3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        3.3.3.0/24 is directly connected, Loopback0
R     4.0.0.0/8 [120/1] via 172.16.1.2, 00:00:25, FastEthernet0/0
R     10.0.0.0/8 [120/5] via 172.16.1.2, 00:00:25, FastEthernet0/0
      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.1.0/24 is directly connected, FastEthernet0/0

note the redistributed eigrp routes are signified by R on the rip router...

while it is a different story on r1...

r1#sh ip route | exc L | inc loop
    
Gateway of last resort is not set

      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.1.1.0/24 is directly connected, Loopback0
      2.0.0.0/24 is subnetted, 1 subnets
D        2.2.2.0 [90/2297856] via 10.1.1.2, 01:23:54, Serial2/0
D EX  3.0.0.0/8 [170/2560512000] via 10.1.1.2, 00:06:05, Serial2/0
      4.0.0.0/24 is subnetted, 1 subnets
D EX     4.4.4.0 [170/2560512000] via 10.1.1.2, 00:06:05, Serial2/0
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, Serial2/0
      172.16.0.0/24 is subnetted, 1 subnets
D EX     172.16.1.0 [170/2560512000] via 10.1.1.2, 00:06:05, Serial2/0

do the metrics really matter?

i'll let the crookbook satisfy that..

  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0

EIGRP uses these K values as coefficients in an involved equation that specifies how to combine all of these different individual metrics into a single numerical value, the composite EIGRP metric. You will notice that only K1 and K3 are nonzero. The result is that, by default, EIGRP uses only bandwidth and delay when computing its metric. So, in fact, you can generally fill in just about anything for the other parameters in the default-metric command, and it won't make any difference.

We note as an aside that while you can change these different K values by using the metric weights command, we strongly advise against changing the defaults. These values were of some use in IGRP, and when Cisco introduced EIGRP, with its superior DUAL algorithm, they carried the parameters forward. However, it was discovered that in practice it was relatively easy to make routing extremely unstable by changing them. And it's almost impossible to make things any better by changing these weight values in EIGRP.

so there...