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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324 Chapter 8: QoS Support on the Catalyst 6500
randomly drop frames in a queue. Unlike RED, however, WRED is QoS aware. It uses the
CoS values assigned to the various frames to determine which frames to randomly drop.
WRED is most efficient in instances where multiple TCP streams are traversing the same
port. WRED exploits TCP’s windowing mechanism to avert congestion. WRED also helps
prevent a phenomenon called global synchronization. Speaking in broad terms, global
synchronization is a side effect of tail drop, where all TCP flows reduce, and subsequently
increase, their window size at the same time. A detailed discussion regarding global
synchronization ...
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