SDWAN communication with Lagacy router

[knaik99]

If we convert any site TO SDWAN router then How SDWAN router will talk to Legacy sites .

Please explain.

[Kanan Huseynli]

Hi,

There is no direct option with pre-defined workflow.

If remote site is branch you can do traditional IKEv2 IPSec tunnel or GRE tunnel over VPN0 (or even service VPN depending on use-case) from SD-WAN router to remote-branch.

Normally, if you have lots of sites and you want to migrate one-by-one. Then you need central devices which act like SD-WAN headend and legacy-VPN (or connection) headend. Then between these two you have routing and you do migration.

Example guide:

https://www.cisco.com/c/dam/en/us/td/docs/routers/sdwan/migration-guide/cisco-sd-wan-migration-guide.pdf

In Ciscolive there should be migration cases as well.

[MHM Cisco World]

Sdwan can talk to other router via vpn 0 (transport)

Where you can run ospf bgp static route and other.

The point here is how we can leak route from vpn0 to other vpn service in sdwan.

This can by redistrubte but instead of redistrubte omp into service igp protocol we need to redistrubte igp transport into igp service.

It easy in cedge but it need some work in vedge.

MHM