The figure outlines how RSVP data flows are allocated when RSVP is configured on an interface. The maximum bandwidth available on any interface is 75% of the line speed; the rest is used for control plane traffic. When RSVP is configured on an interface, the option is to use the entire usable bandwidth or a certain configured amount of bandwidth. The default is for RSVP data flows to use up to 75% of the available bandwidth.
The figure shows that when RSVP is configured, a priority queue is set up and used by RSVP data flows. In the event of congestion, all other data flows are scheduled and queued using either WFQ or WRED mechanisms. The type of scheduling and queuing depends on whether reservations are guaranteed rate or controlled load QoS services.
When RSVP is used with LLQ and class-based weighted fair queuing (CBWFQ), the RSVP data flows are subject to the same rules as all other traffic.
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