WRED and RSVP
WRED is the primary QoS mechanism responsible for providing controlled-load service
to RSVP sessions. Remember from our RSVP discussion that Intserv defines
controlled-load service as service across the network as if it were unloaded. By
WRED keeping a link in a noncongested state by detecting impending congestion
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250 Chapter 8 • Advanced QoS for AVVID Environments
situations and preemptively dropping traffic,WRED can effectively grant services
to RSVP flows as if the network were unloaded.