June 2003
Intermediate to advanced
432 pages
15h 56m
English
book
Cisco Catalyst QoS: Quality of Service in Campus Networks
by Mike Flannagan - CCIE® No. 7651, Richard Froom - CCIE No. 5102, Kevin Turek - CCIE No. 7284
Content preview from Cisco Catalyst QoS: Quality of Service in Campus Networks
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368 Chapter 9: QoS Support on the Catalyst 6500 MSFC and FlexWAN
Distributed Low Latency Queuing
Although WFQ protects low-bandwidth traffic, such as voice, from being starved of
network resources during periods of congestion, WFQ cannot guarantee consistent delay
variations between packets. Although delay can affect overall voice quality, as long as the
delay is consistent the end user might not notice a difference in service. However, variation
in arrival time between voice packets, referred to as jitter, can quickly degrade the perfor-
mance of voice quality. dLLQ is specifically targeted for voice traffic. LLQ assigns a strict-
priority queue for ...
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