ROUTING BETWEEN DOMAINS
Now that we have examined how distance-vector, or link state routing protocols are used within a domain, let us expand the discussion, and see how the routing information can be propagated into another routing domain. Figure 3-15 is used for this analysis. This example is generic in that it does not illustrate any specific protocol. It uses concepts taken from several routing protocols. Two routing domains are shown, labeled RD 1 and RD 2.
Figure 3-15. Propagating Routing Information Across Domains
Routers C and X are designated as border routers for the routing domains 1 and 2, respectively. In this figure, router ...
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