From: Patrick McKinnis (pmckinni@xxxxxxxxx)
Date: Mon Dec 27 1999 - 19:56:32 GMT-3
Queuing is the router process that allows certain traffic types to be
delivered before others, thereby controlling traffic congestion in an
internetwork. It is critical on low-bandwidth links when some
traffic, such as voice, video, and SNA, has delay sensitivity.
Basically, queuing allows the administartor to define what packets
will have priority and what packets will be dropped if the buffers
fill. For instance, you could establish a queuing policy whereas
voice traffic would take priority over FTP downloads when congestions
occurs.
Traffic Shaping is a tool that helps reduce the flow of outbound
traffic when there is congestion within the cloud, on the link, or at
the receiving endpoint router. It is set on interfaces or
subinterfaces within a router. With this feature, the router is able
to alter the flow of traffic based on rate control parameters you
define. For instance, if your hub router is connected to a Frame
cloud at T-1 speed and your spoke router is connected to the same
cloud at 56 kbps, the speed mismatch can cause a bottleneck at the
spoke site when the hub site sends data at a faster rate than the
spoke site can receive. Implementation of traffic shaping would be
advantageous here.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Michael Law
Sent: Thursday, December 23, 1999 10:27 PM
To: CCIE Lab
Subject: What's the difference between Queuing and Traffic Shaping?
What's the difference between Queuing and Traffic Shaping. When
should I use one rather than the other?
Michael
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