Case Study: EIGRP/IGRP Redistribution

One issue commonly faced with EIGRP is redistribution between IGRP and EIGRP for combining networks and for transitioning from IGRP to EIGRP. Use the network in Figure 7-17 as an example.

Figure 7-17. Redistribution between IGRP and EIGRP

In this network, Router A and Router B are redistributing between EIGRP AS 1 IGRP AS 2. They have similar configurations:

hostname A!router eigrp 1 redistribute igrp 2 network!router igrp 2 redistribute eigrp 2 network!

Looking at the routing table, you can see that Router A prefers the IGRP route through Router C, rather than the EIGRP external site ...

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