fortigate sd-wan spillover

Hello AMINET,

The FortiGate will use the lowest numbered interface first

Example:

Port2 & Port3 in sdwan with Spillover, Port2 will be used as a primary member and port3 will be used once port2 reaches the spillover thresholds

If you add another member, port4 in Spillover then

>>> port2, Port3 & Port4

If you add port1 instead of port4 then

>>> port1, Port2 & Port3 <---b'coz port1 is the lowest numbered interface

https://community.fortinet.com/t5/FortiGate/Technical-Note-Dual-WAN-scenario-static-and-policy-routes-and/ta-p/194280?cmd=displayKC&dialogID=90854279&docType=kc&docTypeID=DT_KCARTICLE_1_1&externalId=FD36462&sliceId=1&stateId=0%200%2090852621

Thanks

Sasikumar.S

hi @subramanis 

thanks for your reply, the documentation says that the highest route in the routing table will be chosen, in my case the highest route in the table is not the one with the lowest port number (I have tested).
so the Spillover don't always choose the one with lower port number as primary
we are looking for the method to control it.

thanks in advance..

Hi @AMINET, 

It would be helpful to know how you would like to control it? Are you planning on controling certain traffic? 

In the article, its mentioned that:

1. If you have lower AD, that route would be preferred. 

2. If you have lower priority, that route would be preferred. 

If both are same, the interface with lowest index would be preferred. 

This can be controlled and you can use sdwan rules for this. 

Thanks, 

Shahan Agha