Summarizing External Routes

Now, the question remains: How do you summarize external routes in Enhanced IGRP across network boundaries? As mentioned earlier, external Enhanced IGRP routes are not summarized across a major network boundary.

Consider, for example, the network in Figure 8-12. One side of the network runs OSPF, and the other side runs Enhanced IGRP. Assume that you want to redistribute Enhanced OSPF into Enhanced IGRP and that you want to summarize over the serial interface S0 across the major network boundary.

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