Complete the following tasks to configure a tunnel
interface. Configure the tunnel endpoint last; anything configured
after the tunnel endpoint does not take effect until the tunnel is
brought up the next time. You can perform all other tasks in any order.
Tunnel configuration tasks are relevant only for traffic engineering
Create the MPLS tunnel interface.
host1(config)#interface tunnel mpls:boston
(Optional) Configure the LSP to announce its endpoint
to an IGP (sometimes referred to as registering the endpoint).