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A bandwidth reservation protocol called RSVP (ReSource ReserVation Setup Protocol) is used to establish a reservation for bandwidth from end to end. The IntServ protocol establishes three classes of reservations that are similar to first class, coach, and standby in the airline industry. In IntServ, these classes of service are called guaranteed, control load, and best effort, respectively.
The primary advantage of RSVP is that it checks for bandwidth before a call is established, and then carves out bandwidth from end to end. Think of RSVP as the Secret Service, clearing highways for the president. RSVP goes in front of the traffic and carves out a space for the call.
End-to-end QoS can be achieved through a combination of marking and reservation protocols, as shown in Figure 8.12.
Figure 8.12: End-to-End QoS with RSVP
Checkpoint | Answer the following questions.
Answers: 1. 802.1Q/p, DiffServ, MPLS; 2. false. |
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