The 7210 SAS supports multiple mechanisms to provide transport tunnels for the forwarding of traffic between PE routers within the 2547bis network.
The 7210 SAS VPRN implementation supports the use of:
RSVP-TE protocol to create tunnel LSP's between PE routers
LDP protocol to create tunnel LSP's between PE routers
These transport tunnel mechanisms provide the flexibility to use dynamically created LSPs, where the ‟autobind” feature is used to automatically bind service tunnels, and there is the ability to provide specific VPN services with their own transport tunnels by explicitly binding SDPs, if required. When the auto-bind-tunnel command is used, all services traverse the same LSPs and do not allow alternate tunneling mechanisms or the ability to configure sets of LSPs with bandwidth reservations for specific customers, as is available with explicit SDPs for the service.