SDWAN performance

[HS08]

I have scenario :

My SDWAN rule contain 2 member, ISP-1 and ISP2, have 2 performance SLA, and the strategy using Best Quality with Latency Criteria.

Since there are 2 performance SLA, when the sdwan will switch the connection? Is my understanding below correct?

SLA1 meet & SLA1 meet = not swicthed

SLA1 not meet & SLA1 meet = swicthed

SLA1 meet & SLA1 not meet = swicthed

SLA1 not meet & SLA1 not meet = go to other sdwan rule.

[Jean-Philippe_P]

Hello HS08, 

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible. 

Thanks, 

[Napoji]

Based on the official Fortinet documentation for the Best Quality strategy in SD-WAN, here's how it works when using multiple Performance SLAs and the Latency criteria:

Key Concepts:

• Best Quality strategy selects the SD-WAN member (ISP) with the best performance based on the selected link-cost-factor (in your case, latency).
• If multiple Performance SLAs are configured, the SD-WAN rule evaluates each member's performance against all SLAs.
• A member is considered unavailable if it fails all associated SLAs.

Your Scenario:

You have:

• 2 SD-WAN members: ISP-1 and ISP-2
• 2 Performance SLAs
• Strategy: Best Quality
• Criteria: Latency

Evaluation Logic:

Let’s break down your understanding and verify it:

SLA1 SLA2 Result

:white_heavy_check_mark:	:white_heavy_check_mark:	Not switched (both links are valid, best latency wins) :white_heavy_check_mark:
:cross_mark:	:white_heavy_check_mark:	Switched (the link failing SLA1 is still valid due to SLA2, but if the other link has better latency, it may be chosen) :white_heavy_check_mark:
:white_heavy_check_mark:	:cross_mark:	Same as above :white_heavy_check_mark:
:cross_mark:	:cross_mark:	Link is considered down, SD-WAN will switch to another rule or fallback option :white_heavy_check_mark:

:white_heavy_check_mark: Your understanding is correct.

Additional Notes from Fortinet:

• If any SLA is met for a member, that member is still considered alive.
• The Best Quality strategy will then choose among the alive members based on the lowest latency (or other selected metric).
• If no members meet any SLA, the system may fall back to another SD-WAN rule or default route.

[HS08]

Hi..

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If no members meet any SLA, the system may fall back to another SD-WAN rule or default route.

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With above statement can you confirm if i have below rule

then if internet port1 not meet the SLA then the host will switch to rule 17?