CCDE: Cisco Certified Design Expert (Written) — Question 9

Your design plan includes mutual redistribution of two OSPF networks at multiple locations, with connectivity to all locations in both networks. How is this accomplished without creating routing loops?

Answer options

• A. Use route maps on the ASBRs to allow only internal routes to be redistributed.
• B. Use route maps on the ASBRs to allow internal and external routes to be redistributed.
• C. Use route maps on the ASBRs to set tags for redistributed routes.
• D. Use route maps on the ASBRs to filter routes with tags so they are not redistributed.

Correct answer: D

Explanation

The correct answer is D because filtering out routes with tags ensures that only the intended routes are redistributed, preventing loops. Option A is incorrect as it restricts redistribution to only internal routes, which may not be sufficient for proper connectivity. Option B allows too broad a redistribution that may lead to loops. Option C does not address the need to filter routes, making it an unsuitable choice.