From: Hobbs (deadheadblues@gmail.com)
Date: Tue Sep 30 2008 - 15:07:50 ART
Hello,
I know this is lengthy but I am completely stumped. I have been reading and
labbing some of the examples of 3560/3550 qos on IE's blog and I have run
into some interesting issues in my lab.
R1----\
R3----[SW1]----[SW2]-----R2
R5----/
All ports set to 10M. R1=cos1, R3=cos3, R5=cos5, default cos-output-q map.
R2 has a policy with classes that match precedence (1,3,5) applied to its
interface to meter the rate of each class.
On each router I run this command: "ping 192.168.0.2 rep 1000000 size 1500"
to generate a bunch of traffic. This works great.
Whenever I have priority-queue out on f0/13, cos 5 is always limited to
400,000K no matter if I have a "srr-queue bandwidth limit" or not. In
addition, the other queues eat up the rest of the bandwidth (unless I shape
them of course). In other words, priority queuing is NOT starving the other
queues.
Any other settings I need to check? From what I understand share/shape
parameters on queue 1 don't matter when priority queue is on, and in fact
they don' t affect it - 400K is always the limit!
thanks,
the blog is here for reference:
http://blog.internetworkexpert.com/2008/06/26/quick-notes-on-the-3560-egress-queuing/
Blogs and organic groups at http://www.ccie.net
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