Route-base VPN from strongswan to cisco router

Hi guys.

I've successfully setup extended auth policy based VPN from strongswan at openwrt to cisco router c800 model.
Right now I have idea to use route based VPN instead of policy one. Unfortunately I didn't find complete documentation or "how to". OpenWRT and strongswan sites have non-contiguous documentation parts of route based VPN. Some time these documentation different from source to source.

Could somebody who successfully implemented route-base VPN between strongswan@openwrt to Cisco router/firewall point me at documentation or show working strongswan & cisco configs (if possible of course).

Thank you in advance.