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New Contributor II

SDWAN rule backup for certain traffic only

I have two questions 


First Question

I have two internet links which big different in BW ( 200M Link and 10M Link ) , i want SDWAN strategy to to allow voice traffic to be primary on 200M link and backup on 10M while all other traffic has no backup 


Second Question

What is the behaver for SDWAN rule manual strategy if all member is down , is the traffic will be dropped or  it will going to next rule even the next it the implicit rule 


Running on 6.4.6 version


Dear Ahmed-hassan,


Thank you for posting to the Fortinet Community Forum.


Problem description:-
You want all the voice traffic to go out from 200M link and for backup you want 10M only for voice traffic. For other traffic it should always go from 200M link


Please create a SDWAN rule and select the necessary ISDB and application and use manual method to sent the traffic from 200M and if 200M is down by default it gets route from 10M link.


Since if 200M is down by default only one default route will be active from 10M and even for other link it will be route via 10M link


Q) What is the behaver for SDWAN rule manual strategy if all member is down , is the traffic will be dropped or it will going to next rule even the next it the implicit rule
A)It will be matching the default implicit rule and will work on the basic of load balancing algorithm configure over there


Let us know if this helps.



Salon Raj Joshi
New Contributor II

Thanks for your reply


for the 1st question 

May be i dont explain it well, i will all internet traffic ( included Voice ) to go through 200M and if 200M link is down , only voice traffic will be routed to 10M while other traffic should be dropped 

As i know if i create manual strategy primary 200M & secondary 10M  for voice then 200M be down then voice traffic will go 10M but all other traffic will match in implicit rule which will find 10M active 


How can i avoid all other traffic to be routed to 10M 


for the 2nd question , i totally got it thanks 



Hi Ahmed-hassan,


There is no deny action in SDWAN rule and it is not matching any of the sdwan rule then by default it will match the default implicit rule and even other traffic will start flowing from 10M link



Salon Raj Joshi



In your static routes (which I am assuming you use), configure only the static routes for your voice traffic over the 10M link. Do not configure a default route with "SDWAN" enable, rather only use the 200M link. 


Use a SDWAN rule with the method of your choosing for the voice traffic and select both the 200M and the 10M links. This way failover can occur for this traffic. 


If the 200M link were to fail the performance SLA, no route for the internet traffic is available through the 10M link and as such, internet traffic will not be forwarded through that link.




Hello Vignesh, 


Thanks for your reply, its really good solution but the problem actual for the "voice subnets" which actually unknown as i planned to use ISDB for microsoft teams for it so i can not do static routing for it 

New Contributor II

hi ,


did you try policy route to drop the traffic.



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