Tunnels provide a way of transporting datagrams between routers that do not support the same protocols. Often, these routers are separated by networks.
To configure tunneling, you must identify the tunnel-server ports that reside on modules that support tunnel services. You can then assign the tunnel-service interfaces that encapsulate protocols and enable them to be tunneled across the network.
Figure 13 displays the interface stacking for tunnel-service interfaces on a tunnel-server module.
Figure 13: Interface Stacking for Tunnel-Service Interfaces
This section describes the types of tunnel-server ports that you can configure on tunnel-server modules and the types of tunnel-service interfaces that you can run on these ports.
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