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Question 61 - JN0-280 discussion

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You are creating an IP fabric underlay and want to use OSPF as your routing protocol.

In this scenario, which statement is correct?

A.

All leaf devices must be configured in separate OSPF areas.

Answers
A.

All leaf devices must be configured in separate OSPF areas.

B.

All leaf and spine devices must be the same model to ensure the proper load-balancing behavior.

Answers
B.

All leaf and spine devices must be the same model to ensure the proper load-balancing behavior.

C.

Interface speeds should be the same throughout the fabric to ensure that all links are utilized.

Answers
C.

Interface speeds should be the same throughout the fabric to ensure that all links are utilized.

D.

All spine devices must use the same router ID.

Answers
D.

All spine devices must use the same router ID.

Suggested answer: C

Explanation:

When creating an IP fabric underlay using OSPF as the routing protocol, consistent interface speeds are important to ensure optimal traffic distribution and utilization of all links.

Step-by-Step Breakdown:

OSPF and Interface Speeds:

OSPF calculates the cost of a link based on its bandwidth. The default cost calculation in OSPF is:

If interface speeds vary significantly, OSPF may choose paths with lower cost (higher bandwidth), resulting in some links being underutilized.

Equal Utilization:

To ensure that all links are equally utilized in an IP fabric, it is recommended to maintain uniform interface speeds across the fabric. This ensures balanced load sharing across all available paths.

Juniper

Reference:

IP Fabric with OSPF: Juniper recommends consistent interface speeds to maintain even traffic distribution and optimal link utilization in IP fabric underlay designs.

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asked 10/10/2024
Jeffrey Cayao
36 questions
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