Site-to-Site IKEv2 IPSec VPN using Pre-Shared Key Authentication - simple configuration example for two Cisco routers - NIL - Network Information Library
Real LAB GNS3 : Configuring Cisco Router as L2TP+IPsec | Full Video - YouTube
Configuring L2TP over IPSec VPN on Cisco ASA – IT Network Consulting | Design, Deploy and Support | San Diego