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Question 16 - NSE8_812 discussion

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Refer to the exhibit, which shows a Branch1 configuration and routing table.

In the SD-WAN implicit rule, you do not want the traffic load balance for the overlay interface when all members are available.

In this scenario, which configuration change will meet this requirement?

A.
Change the load-balance-mode to source-ip-based.
Answers
A.
Change the load-balance-mode to source-ip-based.
B.
Create a new static route with the internet sdwan-zone only
Answers
B.
Create a new static route with the internet sdwan-zone only
C.
Configure the cost in each overlay member to 10.
Answers
C.
Configure the cost in each overlay member to 10.
D.
Configure the priority in each overlay member to 10.
Answers
D.
Configure the priority in each overlay member to 10.
Suggested answer: C

Explanation:

The SD-WAN implicit rule is a default rule that applies to all traffic that does not match any explicit SD-WAN rule. The SD-WAN implicit rule uses the best quality strategy, which selects the SD-WAN member with the best measured quality based on the performance SLA metrics. This means that the traffic load balance for the overlay interface will depend on the quality of each overlay member, which may vary over time. However, if the requirement is to minimize the overhead on the device for WAN traffic and avoid load balancing for the overlay interface when all members are available, one option is to configure the cost in each overlay member to 10. The cost is a parameter that can be used to influence the selection of an SD-WAN member by adding a penalty value to its quality score.

By configuring the same cost value for all overlay members, the quality score of each member will be reduced by the same amount, which will make them less preferable than the underlay members.

This way, the SD-WAN implicit rule will select the underlay members first, unless they are unavailable or out of SLA, and only use the overlay members as a backup option. Reference:

https://docs.fortinet.com/document/fortigate/7.0.0/sd-wan/19662/sd-wan-rules

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asked 18/09/2024
John Bocachica
46 questions
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