From: Joe Rinehart (jjrinehart@hotmail.com)
Date: Tue Oct 25 2005 - 18:15:47 GMT-3
I have had a question come up on MPLS-related QoS mechanisms in Service
Provider environments. Most MPLS implementations have at least 4 classes of
service, one of which is an LLQ type real time class, and three which are
data classes using CBWFQ. I also realize that when using IP Precedence/DCSP
markings that the router will increase the weight of the "higher" classes.
An engineer has been commenting that in order to "truly" prioritize one
class over another, that a higher bandwidth needs to be assigned to the
higher data-oriented CBWFQ classes, with less to the the lower ones, like an
inverted pyramid. The main reason is supposedly because the greater the
bandwidth setting the more often the queue is going to be serviced.
The burning question for me is with IP Prec/DSCP changing the CBWFQ weights
is it still necessary to fatten up the "higher" queues?
Joe Rinehart
CCIE #14256, CCNP, CCDP
Data Network Consultant
AT&T Pacific Northwest Enterprise Markets
This archive was generated by hypermail 2.1.4 : Sun Nov 06 2005 - 22:00:53 GMT-3