Choosing Between Three Routes to Same Subnet

certskills
By certskills March 31, 2015 09:05

Today’s question focuses on one router that has three different available routes to the same subnet (10.1.2.0/24). Which should it choose? Details below, and answer in a few days.

R1 happens to run RIP-2 over the link to R2, OSPF over the link to R3, and EIGRP over the link to R4. All three of the routers on the right advertise a route for 10.1.2.0/24. R1’s metric for the RIP-2 route is 1; with OSPF the metric is 65; and for EIGRP, the metric is 2,168,134.

The first question: Which router will R1 choose? And Why?

Next, R1 is configured with a static IP route for 10.1.2.0/24, with the next-hop router configured as R2, R3, or R4. Which one? Pick whichever router you didn’t pick as the answer to the first question. Which route, and which next-hop router, does R1 use now for packets destined for 10.1.2.0/24?

Answers: Summary Route Drill 3
Answer to the "Which Route..." question
certskills
By certskills March 31, 2015 09:05
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2 Comments

  1. Dave in Ohio April 1, 14:17

    1)R4 will be preferred due to lowest AD. Metrics are irrelevant here.

    2) The static route will be preferred over any of the learned routes, again due to lowest AD.

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  2. CCENTSkills April 2, 08:29

    Thanks Dave for the post. The answers post is now up as well. But I agree!
    Wendell

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