CCDE: Cisco Certified Design Expert (Practical) — Question 110

Company XYZ runs OSPF in their network. A design engineer decides to implement hot-potato routing architecture. How can this implementation be achieved?

Answer options

• A. Enable iBGP and apply prepend to ensure all prefixes will have the same length of the AS path attribute value.
• B. Redistribute the external prefixes onto OSPF and ensure that the total metric calculation includes external and internal values.
• C. Enable OSPF load-balancing over unequal cost path.
• D. Redistribute the external prefixes onto OSPF and ensure the total metric calculation includes only the external value and the value is the same in all ASBRs.

Correct answer: D

Explanation

The correct answer is D because hot-potato routing requires that the external prefixes be redistributed into OSPF with a uniform metric across all ASBRs, ensuring that the routing decisions favor the nearest exit point. Options A and B introduce complexities that do not align with hot-potato principles, while option C does not guarantee uniform metrics, which is essential for this routing strategy.