SD-WAN ADVPN how to view shortcut routes ?

[fran19422]

Hello, I have SD-WAN controlled ADVPN tunnels via BGP.

How do I clearly view if a shortcut route is being used in the route table ?

[DPadula]

Hi fran19422,

On routing table you will see the shortcut routes with a '_x', where 'x' mean a number. 
Example:

 B 192.168.3.0/24 [200/0] via 10.10.10.3, advpn_0, 00:00:28

On this case the number is '0' (zero) but it can also be any other number. Basically, once you see a underscore followed by a number probably it is a shortcut route. So don't use '_' when on ADVPN names.

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Fortinet-Auto-Discovery-VPN-ADVPN/ta-p/195...

[fran19422]

Thank you.

So does ADVPN use it's own SLA measurements to determine when to use the shortcut path or the main IPSEC tunnel ?

[DPadula]

You might be confusing SDWAN with ADVPN. You can have SDWAN with ADVPN.

ADVPN uses routing information to choose which link to use, so decisions are done based on the routing table. SDWAN will choose which link (physical or logical) to use based on SDWAN rules, zones and members and finally SLA performance defined by you.  

ADVPN creates tunnels between branches or spokes automatically when necessary only.