From: Sam.MicroGate@usa.telekom.de
Date: Thu Jan 02 2003 - 18:35:47 GMT-3
I am trying to finish and summarize QoS chapters in CCO. Below is the ways
and definitions of how to reserve bandwidth. Please feel free to add/correct
to this list:
WFQ: partition traffic into different flows based on weight. The weight of
each flows is derived from packet size and/or ip precedence. The lower the
weight the lower the bandwidth allocated to this flow.
CBWFQ: the bandwidth command under the policy-map will define the MINIMUM
bandwidth available for that class. In time where there is no congestion,
this class can use more bandwidth than the one identified in the bandwidth
command.
Priority: reserve a strict priority queue for a defined class (could be any
thing voice or telnet for example) the bandwidth assigned in this command is
the MAXIMUM bandwidth that would be allocated for this class in the time of
congestion.
Ip rtp priority: similar to priority command but works only for udp
protocols (voice or otherwise) It reserve the MAXIMUM bandwidth in case of
congestion for the udp protocols that are in the range.
Ip rsvp bandwidth x y: is only reservation method that reserve bandwidth
permanently (congestion or no congestion) It is also the only reservation
method that you can assign the maximum bandwidth per each reservation.
CQ: You can assign an approximate percentage of bandwidth to different
classes of traffic. Each class will have a different queue. Up to 256 queue.
Sam
.
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