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HT_JDC
HT_JDC
New Member
October 21, 2024
Question

SD-WAN: Multiple lines are used simultaneously ? (non Aggregation case)

  • October 21, 2024
  • 1 reply
  • 2299 views

Dear Experts,

Are multiple lines used simultaneously at non-aggregation SD-WAN?

 

Here is my situation.

Fig1.png

 

Between SD-WAN Fortigates, there are L2 switch which limits 10Mbps bandwidth.

iperf with UDP 10Mpbs runs at PC1 and the server is PC3.

iperf with UDP 10Mpbs runs at PC2 and the server is PC4.

However, only 5Mbps is seen at both PC3 and PC4. That is, only 1 line seems to be used.

 

Here is SD-WAN rule setting.

Question1.PNG

How should I do in order to use simultaneous lines at non-aggregation SD-WAN?

 

For information, at aggregation SD-WAN, 20Mbps seems to be used only when PC1 connects to PC3.

(PC2 and PC4 are not used.)

 

Thanks in advance,

 

1 reply

Krispin
Krispin
Explorer
October 21, 2024

Hi,

If you are not using Maximize bandwidth (FortiOS 7.2 or lower) or using load-balance option within the SDWAN rule (7.4 or higher) only one line will be used. More here:

https://docs.fortinet.com/document/fortigate/7.4.5/administration-guide/708464/load-balancing-strategy

 

    HT_JDC
    HT_JDCAuthor
    New Member
    October 21, 2024

    Hello Krispin,

     

    Thanks for your reply.

    I use v7.4.5. I do not intend to select load-balance. (I select "best performance", as seen in my previous post.)

     

    How can I configure in order to use multi lines simultaneously?

    (Manual setting might be ok for me.)

     

    Thanks in advance,

    Krispin
    Krispin
    Explorer
    October 21, 2024

    With best performance you will not be able to use multiple links for load balancing. Idea behind the best performance sdwan rule is to use THE best link (only one best link available). You would need to use either lowest cost SLA or manual SDWAN rule to enable load-balance.

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