Please, refer to the previous parts of this article, for information on the diagram and terms. For this scenario, called “dual-core”, we want the “fast” Ethernet connections (VLAN 356) to be used as primary transport for packet exchange between the routing domains. The Frame-Relay cloud should only be traversed, if the primary (“fast”) connections fail for some reason. That obviously means we will need to configure two transit domains: the OSPF and EIGRP 356. Plus, routes traversing EIGRP 356 should be given higher preference inside other routing domains, since it’s going to be the primary transit path.
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