From: Tony Schaffran \(GS\) (groupstudy@cconlinelabs.com)
Date: Tue Mar 11 2008 - 16:54:10 ARST
Don't drop on DSCP.
Use NBAR to identify the traffic then drop.
Tony Schaffran
Network Analyst
CCIE #11071
CCNP, CCNA, CCDA,
NNCDS, NNCSS, CNE, MCSE
www.cconlinelabs.com
Your #1 choice for online Cisco rack rentals.
-----Original Message-----
From: Joseph Brunner [mailto:joe@affirmedsystems.com]
Sent: Tuesday, March 11, 2008 12:42 PM
To: groupstudy@cconlinelabs.com; 'groupstudy'
Subject: RE: real world QOS issue
Yeah, duh, I'm dumb...
(no wonder I'm going for 3 more stars, so I can learn something)
What I did in my little qos world was use CS1/Scavenger as a place to put
stuff I wanted to drop anyway (like kazaa, bittorrent, etc)
So what is the recommended dscp for stuff you REALLY do want to drop, even
if there is NO congestion...
Thanks,
Joe
-----Original Message-----
From: Tony Schaffran (GS) [mailto:groupstudy@cconlinelabs.com]
Sent: Tuesday, March 11, 2008 1:24 PM
To: 'Joseph Brunner'; 'groupstudy'
Subject: RE: real world QOS issue
You would normally not drop scavenger class unless you are experiencing
congestion.
Tony Schaffran
Network Analyst
CCIE #11071
CCNP, CCNA, CCDA,
NNCDS, NNCSS, CNE, MCSE
www.cconlinelabs.com
Your #1 choice for online Cisco rack rentals.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Joseph Brunner
Sent: Tuesday, March 11, 2008 9:45 AM
To: 'groupstudy'
Subject: real world QOS issue
Can anyone tell me why Sungard (and I know several of you guys work for
them) would mark data from their websites with CS1 ???!?!?!?!?
What are you thinking? That is the scavenger class in many books and it's
frequently used in the real world to mark JUNK (to be dropped later).
Just today I solved an issue where a client couldn't get to a few big firm's
website. Turns out they are all hosted on Sungard.
I had to temporarily disabled the scavenger class's drop setting
policy-map somepolicy
class scavenger
drop
interface f0/0
service-policy output somepolicy
Take this capture image from example law firm, www.shearman.com
<http://www.shearman.com/>
http://img364.imageshack.us/my.php?image=shearmanyo5.jpg
Can anyone explain this!!!
Thanks,
Joe
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