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 10.0.0.0!router igrp 2 redistribute eigrp 2 network 10.0.0.0!

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

Get Advanced IP Network Design (CCIE Professional Development) now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.