"Admission control: For QoS transport (other than default best-effort transport), ISA requires that a reservation be made for a new flow. If the routers collectively determine that there are insufficient resources to guarantee the requested QoS, then the flow is not admitted. The protocol RSVP is used to make reservations. Routing algorithm: The routing decision may be based on a variety of QoS parameters, not just minimum delay. Queuing discipline: A vital element of the ISA is an effective queuing policy that takes into account the differing requirements of different flows. Discard policy: A queuing policy determines which packet to transmit next if a number of packets are queued for the same output port. A separate issue is the choice and timing of packet discards. A discard policy can be an important element in managing congestion and meeting QoS guarantees."
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