An Optimized Tunnel Mechanism Based on DiffServ/RSVP

The tunnel mechanism of IPv4 WAN backbone net based on DiffServ system is a primary solution to transit IPv6 from IPv4. The QoS guarantee supplied by this tunnel mechanism is analized. The reason why DiffServ fails to realize the QoS guarantee in IPv4 WAN backbone net is given. Then the controlled acceptance mechanism that RSVP is introduced in DiffServ systems is introduced, and the service quality based on Diffserv/RSVP is studied. The result shows that the huge information of route table of nodes still has certain side effect on the QoS guarantee in Diffserv/RSVP system and that QoS is guaranteed based on Diffserv/RSVP system.