SDWAN performance

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, 

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: 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.