In this chapter, you learn about the following topics:
Introduction to Virtual Routers
Implementing Virtual Routing with Cisco IOS
Using Tunnels to Build Network-Based IP VPN
Using GRE for IP VPN
Using IPSec for IP VPN
Routing Between VRF-Lite PEs
Up to this point in the book, only MPLS has been offered as a way to run network-based VPN services from provider edge (as opposed to customer premises) routers. However, not all networks in the world run MPLS. The IPSec and GRE VPNs discussed in Chapter 3, “VPNs in Broadband Networks,” are all initiated from the customer premises. (Thus, they are CPE VPNs according to the taxonomy.) Using CPE VPNs is a perfectly valid and heavily deployed solution, ...