From: Thomas.W.Johnson@chase.com
Date: Mon Mar 19 2007 - 14:48:48 ART
I have seen a question similar to this in my studies. So I am
interested in the solution as well.
The problem I have with the solution is ECN notifies senders when there
are a certain number of packets in queue and based on the MPD. I do not
understand how this will notify senders of congestion when the link
reaches 75%.
I would think you would need to police traffic and enable ECN for any
traffic exceeding the policed rate. However, that is not an option in
the police command.
Am I over thinking the requirements or is there another solution to this
problem?
Thanks
Thomas Johnson
JP Morgan Chase
Global Network Implementation
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Darby Weaver
Sent: Sunday, March 18, 2007 7:46 PM
To: andres_ccie@hotmail.com; ccielab@groupstudy.com
Subject: Re: Congestion avoidance
As long as you change the interface to consider 100%
bandwidth you should be ok. I see you have done this
but sometimes it is easy to forget. Also you may want
to be careful that the interface has not had a
previous requirement to change the default bandwidth
for any reason.
And remember the keyword load is used in your example.
So you should be keenly aware if other terms might be
used as well. I would recommend changing the
variables in your example and changing the example
given in CCO and performing a bit a criss-cross,
produce the condition, observe the results and work in
a methodical fashion. Use extended pings to help
produce the desired congestion. Caslow gives great
examples that can be used for QoS examples like this
one and others.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hq
os_c/part15/ch05/hwrdecn.htm#wp1015359
The example listed in the link above should give you
an example of the correct verification commands as a
very similar example as you have presented - so you
can compare your output line for line.
--- andres_ccie@hotmail.com wrote:
> Hi Group,
> I have the following questions:
>
> Configure on interface x/x R1 congestion avoidance,
> that if if's load is 75%, then router must say to
> traffic source about it and that source reduce
> speed.
> Dont use FECN & BECN.
>
> Mi answer:
>
> policy-map PM
> class class-defaut
> bandwidth percent 75
> random-detect
> random-detect ecn
>
> int x/x
> max-reserved-bandwidth 100
> service-policy output PM
>
>
> This answer is correct?.
>
> Thanks a lot.
> AA
>
>
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