Site to Site IPSEC VPN Between Cisco Router and Juniper Security Gateway
Configure a LAN-to-LAN IPsec Tunnel Between Two Routers - Cisco
Site-to-Site IKEv2 IPSec VPN using Pre-Shared Key Authentication - simple configuration example for two Cisco routers - NIL - Network Information Library
Creating a Site to Site IPSec VPN with a Palo Alto Networks Application Firewall and a Cisco Router | Curiosity killed the cat