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FortiGab
FortiGab
Explorer
October 24, 2022
Question

SD-WAN - Keep connectivity on newly active link without switching back to a recovered primary link

  • October 24, 2022
  • 1 reply
  • 3599 views

Hello Everyone,

just a quick question.

I have a simply SDWAN Manual policy with Manual Preference, Wan 1 and Wan 2.

Both links are not reliable, so it happens that connectivity fails on Wan 2, and after few minutes Wan 1 comes back and Wan 1 is newly the active link.

This policy is configured for a very particular application who suffers when public IP chagnes.

So, my goal is:

When WAN 2 becomes active and WAN 1 is restored after a failure, internet connectivity stays on WAN 2 until a new failover occurs.

Is this possible? 

thank you

1 reply

distillednetwork
distillednetwork
Explorer II
October 24, 2022

If you do not have a preference for which WAN is used when, you could simply not have any SDWAN rules and then use either Source IP or source-destination IP for the Load balancing algorithm.  As long as you have "set update-static-route enable" on the performance SLA, it will remove the route and just go out the interface that is still there.

 

Existing sessions should stay where they already are and related traffic load balanced accordingly.

 

 

FortiGab
FortiGabAuthor
Explorer
October 26, 2022

hey disti,

thank you for your feedback.

Will this prevent the traffic to come back on WAN1 when this interface is back to available?

distillednetwork
distillednetwork
Explorer II
October 26, 2022

No new sessions and clients talking will go back to WAN1 but existing ones should stay on WAN2 until they end their sessions.  

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