From: ccie2be (ccie2be@nyc.rr.com)
Date: Mon Mar 14 2005 - 09:56:20 GMT-3
Hi Jongsoo,
You're raising an issue I've been talking about even since my last lab
attempt where I got my butt kicked especially on QoS.
If you search the GS archives during the period starting in the 2nd half of
last November and going through December, you'll find a number of discussion
threads between me and Bob Sinclair, Scott Morris, and perhaps Marvin
Greenlee on this topic.
As you just discovered, the police command has lots of parameters and can be
extremely confusing.
However, one of things you want to try to avoid is reading too much into the
task.
Take your first example, why wouldn't you just configure:
police 1000000
and let IOS fill-in the rest.
IOW, do you really need to compute "normal burst"? If you let IOS compute
"normal burst", what would be the problem?
Besides, how would you compute "normal burst"? Doesn't that vary depending
on the rate being policed?
I don't remember all the details, but I recall that Tc is determined in a
very different way when policing versus traffic shaping.
In your 2nd example, I don't think you should use pir. That's for the
situation where you have 2 rates: cir and pir - which has never made much
sense to me since cir already has a mechanism for bursting above the cir
rate. It's called be.
Personally, I suspect this pir thing is a result of the wide-spread illicit
drug problem having affected some people at Cisco. :-)
HTH, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jongsoo.Kim@Intelsat.com
Sent: Sunday, March 13, 2005 2:23 PM
To: ccielab@groupstudy.com
Subject: police (two rates) under policy map
I don't think many of you know about this new command 12.2T.
At least, I found out this today. It may answer one of my QoS questions I
couldn't answer a few weeks.
Pay attention on units "bits" vs "bps"
If question said " police 1Mbps with normal burst = 64Kbits.
police 1000000 8000 conform-action transmit exceed-action drop
But if question ask " police 1 Mbps with burst rate of 64Kbps", how can you
configure?
Maybe it should say peak-rate instead of burst rate?
At least, I am thinking
police cir 1000000 pir 1064000 conform-action transmit exceed-action
transmit violate-action drop
Any feedback is welcomed.
Regards
Jongsoo
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