From: Gustavo Novais (gustavo.novais@novabase.pt)
Date: Sat Jul 23 2005 - 14:26:40 GMT-3
Hello,
I hope this isn't a dumb question, but here it goes...
Being the 3550 switch a multilayer switch, when you configure any
parameter related to mls qos on the switch, being classification,
policing, marking, scheduling, you are configuring its L2 QoS
"mecanisms". The purpose of this mecanisms, for what I've understood,
are at the ingress, get a basis for comparison (hence everything has to
have DSCP values assigned to it internally) , compare (police), act
depending the result of the comparison. At the egress - remap result
packets of marking DSCP to CoS values and assign exit queues based on
Cos Value.
All of this is result of its L2 mechanisms. My question is, is it
possible, on the switch to remark packets at your own will, as you can
do with for example a router with CBWFQ and Service policies, on which
traffic matching class A is marked with whatever DSCP/IPprec we want? I
know that DSCP mutation maps can be employed to change DSCP values but I
think that is it.
Another doubt is, can you apply an effective service policy on a 3550
port that has not "no switchport" configured (L2 only)?
I'll lab this up, but I'd like to have the groups opinion (3550 QoS
isn't definitely one of my strongest areas...)
TIA
Gustavo
This archive was generated by hypermail 2.1.4 : Sun Sep 04 2005 - 17:00:30 GMT-3