400-007: Cisco Certified Design ExpertDemo

Question

Company XYZ plans to deploy OSPF. The design requires two OSPF networks to be mutually redistributed at multiple locations while ensuring end-to-end connectivity to all company networks. Which technology can meet these requirements while preventing routing loops?

A Redistribute routes as external type 2 routes
B Create a virtual link between ASBRs
C Use route maps on ASBRs to filter routes with tags so they are not redistributed
D Change the router ID for both ASBRs

Explanation

Route tags applied during redistribution let ASBR route maps recognize routes that originated in the other OSPF domain and filter them from redistribution back into that domain. This prevents feedback loops while permitting the intended exchange of reachability information. Cisco documents tagging a route during redistribution and filtering it at a remote router to prevent redistribution back into the same domain.

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Cisco: Redistribute OSPF Among Different OSPF Processes

400-007: Cisco Certified Design ExpertDemo

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