From: Chris Lewis \(chrlewis\) (chrlewis@cisco.com)
Date: Wed Jul 27 2005 - 12:51:38 GMT-3
To get the Doc CD explanation, you need to lookup the 12.3 command
reference for both police and police (two rates)
Policing can take multiple forms.
One rate two color or three color (RFC 2697)
Two rate three color (RFC 2698)
Two color refers to confrm and exceed actions as a result of policing,
Three color means there is confrom, exceed and violate actions.
The straight police command refers to the single rate system, the police
cir to the two rate system
Single rate 3 color is configured with police cir Bc Be conform exceed
violate
For single rate, Be need not be specified if there is no violate action.
When you configure the violate action, separate Bc and Be buckets are
used.
Two rate three color config: police cir Bc pir Be conform exceed violate
Policing is enforced according to 2 separate rates. Default Bc and Be
value is (configured rate/8)*1.5
The idea here is that there is a normal rate under which packets
conform, which is the CIR, above that rate and up to the PIR, packets
have the exceed action, and abover the PIR, packets take the violate
action.
If police percent is required, the reference bandwidth that is used to
form the basis of percent is important. For example if there is a police
percent in a child policy, and the parent is shaped to 512, 512 is the
rate that percent uses. If bandwidth is used instead of shape in the
parent policy, there is no upper limit on the amount of traffic the
class can send if there is no congestion, so the operation is to look
one level higher to the interface level bandwidth command.
This is a very short summary, it takes lots of practice to become
anywhere near familiar with this topic IMHO.
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
B Kim
Sent: Wednesday, July 27, 2005 10:14 AM
To: 'CCIE Study Group'
Subject: CB Policing - police vs police cir
Hi Group,
I was puzzled by the difference between police command and police cir
command.
I would appreciate if anyone clearly explains what the cir keyword does.
Thanks
B. Kim
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