End-to-End QoS Network Design

Chapter 8. Bandwidth Reservation

This chapter includes the following topics:

• RSVP as a call admission control mechanism

• RSVP and LLQ

• RSVP and MPLS traffic engineering

• Scalability

• RSVP-DiffServ integration

• Endpoints and proxies

The QoS tools discussed so far in this book, including marking, queuing, policing, and shaping mechanisms, primarily have been DiffServ tools. DiffServ mechanisms provide bandwidth guarantees (at various level of rigidity), but none of them provides bandwidth reservations. Guaranteed implies that the bandwidth will be there when needed, but it is not set aside (or reserved) for a specific application or flow. Reserved, on the other hand, implies that a flow of packets can be recognized and that a certain amount of bandwidth has ...