From: Dennis J. Hartmann (dhartma5@optonline.net)
Date: Mon May 09 2005 - 22:09:42 GMT-3
I don't believe anyone will see a CAR question on the exam because
the rate-limit command is a deprecated feature. The police command has
replaced the rate-limit command. Notice that there's no PIR option in CAR
(rate-limit). Rate-limit isn't even an option in the now EOS 3550 switch.
On the 3550, you must police in the MQC. The exam bluepring states
(policing), not rate-limit or CAR (even though CAR is a method of policing
traffic).
Sincerely,
Dennis Hartmann
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of san
Sent: Monday, May 09, 2005 2:32 PM
To: mani poopal
Cc: ccielab@groupstudy.com
Subject: Re: cisco press CCIE R & S LAB#5 QOS QUESTION page#327
Mani,
You probably have understood the question in a different manner.
"Any Remaining traffic" means non -access-list of 101. If that is the case,
we cannot use continue.
Attaching good example from IP qos book , srinivas. on topic "continue"
----------------------------------------------------------------------------
--------------
Limiting a Particular Application's Traffic Rate at a Service Level A
service provider has one of its premium customers define its traffic service
level. All customer traffic except Hypertext Transfer Protocol
(HTTP) (Web) traffic over a rate of 15 Mbps is marked with an IP Precedence
of 4. HTTP traffic over a rate of 15 Mbps is transmitted with an IP
Precedence of 0. The customer has a 30-Mbps service from the service
provider.
Limiting HTTP Traffic at a Service Level to a Specific Rate Interface
Hssi1/0/0 rate-limit input 30000000 15000 15000 conform-action continue
exceed-action drop rate-limit input access-group 101 15000000 10000 10000
conform-action set-prec-transmit 4 exceed-action set-prec-transmit 0
rate-limit input 30000000 15000 15000 conform-action set-prec-transmit
4 exceed-action set-prec-transmit 4
!
access-list 101 permit tcp any any eq www (1051 port talking to port 80)
access-list 101 permit tcp any eq www any (( port 80 talking to 1051 ))
The first CAR statement is used to rate-limit all incoming traffic to 30
Mbps. It uses a continue action so that you continue to the next rate-limit
statement. The second rate-limit statement is used to set the IP Precedence
value for HTTP traffic based on its traffic rate.
The last rate-limit statement is used to set the IP Precedence value to 4
for all non-HTTP traffic
/SAN
On 5/9/05, mani poopal <mani_ccie@yahoo.com> wrote:
> Hi Group,
>
> The question in the book is
>
> "configure CAR on R6 a3/0, so that web traffic will be sent but using ip
precdence 5 for web traffic that conforms to the first rate policy, non
conforming web traffic uses ip precedence 0. Any remaining traffic is
limited to 8mbps, with normal burst size of 16,000 bytes and an excess burst
size of 24000 bytes. Traffic that conforms should sent with ip precedence 5
and traffic that does not conform should be dropped"
>
> solution in the book:
> int atm3/0
> rate-limit output access-group 101 20000000 24000 32000 confrom-action
> set-prec-transmit 5 exceed-action set-prec-trasnmit 0 rate-limit
> output 8000000 16000 24000 confrom-action set-prec-transmit 5
> exceed-action drop
>
> access-list 101 permit tcp any any eq www
>
> Guys, I have 2 questions:
> 1. for the first rate policy the limit is not given 2. I think the
> first rate policy statement should be "rate-limit output access-group
> 101 20000000 24000 32000 conform-action set-prec-transmit 5
> exceed-action set-prec-continue 0 So the question is is set-prec-transmit
5 is right or it should be set-prec-continue 0, I think later is right
because if you don't put continue it wont read the second rate-limit
statement. Any suggestions are appreciated, I would be happy if scott,
Brian or Marveen comes to give any suggestions to this doubt.
> Again thanks a lot for all the answers.
>
> thanks
>
> Mani
>
> B.ENG,A+,CCNA,CCNP,CCNP-VOICE, CSS1,CNA,MCSE
> (416)431 9929
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