From: Michael Snyder (msnyder@revolutioncomputer.com)
Date: Wed Feb 04 2004 - 14:11:03 GMT-3
Yo, did you read the configuration notes?
Avoid setting the CIR or minCIR at the access rate. Otherwise, you may
see output queues building up and causing big delays in CBWFQ classes.
The reason is that the shape rate does not take into account the
overhead bytes of the flag and Cyclic Redundancy Check (CRC) fields, so
shaping at line rate is actually oversubscribing and will cause
interface congestion. There really is no reason to shape at the access
rate. You should always traffic shape at 95 percent of the access rate
or, more generally, the aggregate shaped rate should always be 95
percent below the access rate.
So if I'm taking the CCIE lab and get this CBWFQ on frame-relay, and
follow this config note. ???
About five times a year, I see issues that we really need a ccie proctor
to issue a ruling on. Cisco I wish you would setup a mechanism clear up
confusing and conflicting cco information. How about advanced
techniques like using TOS fields to set DSCP values? A yea or nay would
be very desirable for the acceptability in the lab of such advanced
techniques.
I'm not asking for trade secrets, but rather clear technical policy on
vague issues that could come up in the lab.
I'm assuming our messages are monitored by cisco. I believe the config
note above is a perfect example needing someone in the CCIE program to
chime in.
Michael
-----Original Message-----
From: Saleem Rahman (salrahma) [mailto:salrahma@cisco.com]
Sent: Wednesday, February 04, 2004 7:45 AM
To: Tahsin Hersan
Cc: ccielab@groupstudy.com
Subject: RE: CBWFQ & FR Question
You will be able to find the answer on this link...look under the
section 'Choosing Where to Apply a Service Policy'
http://www.cisco.com/warp/public/105/cbwfq_frpvs.html
Cheers,
Saleem
CCIE # 9062 (R&S and C&S)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Tahsin Hersan
Sent: Wednesday, February 04, 2004 1:52 PM
To: ccielab@groupstudy.com
Subject: CBWFQ & FR Question
Hi,
When configuring CBWFQ, if interface encap is Frame Relay,
Where should i put "service-policy pmap_name {in|out}" command? Under
physical and/or sub interface or under frame-relay map-class?
Thanks for your answers in advance,
Cheers,
Tahsin
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