Deployment of IPv6 in Existing Networks
A service provider can use various methods if it wants to deploy a pilot IPv6 network, based on the transport topology used in the network core. These methods include the following:
If the network core is IP-based, IP tunnels can be built between edge routers that support the IPv6 protocol, as shown in Figure 8-1. These tunnels then act as point-to-point links supporting the IPv6 protocol. The IPv6 packets that are exchanged between the edge routers can be transported transparently across the backbone encapsulated in IP packets.
Figure 8-1. IPv6 Transport Across IPv4 Tunnels
If the network core is using Layer ...