Chuck,
This is a very interesting post. I did some checking and I found
this link that might address the requirement based on the design. This can
be done by using 6500 switches instead of routers as depicted in your lovely
ASCII art.
http://www.cisco.com/warp/public/cc/pd/si/casi/ca6000/tech/cat65_wp.htm
They make the following note..
Configuring Policers
The next step is to define a policer. The Catalyst 6500 supports microflow
and aggregate policing. A Microflow policer defines the policing of a single
flow, which is defined by a session with a unique SA/DA MAC address, SA/DA
IP address and TCP/UDP port numbers. For each new flow that is initiated
through a port of a VLAN, the microflow can be used to limit the amount of
data received for that flow by the switch.
I notice you're using the "LX" based fiber connection between your routers
but the design does suggest a "campus" or MAN type architecture. In this
design I'm guessing that the 6500 with dual MFSC's and PFC's as noted on the
link would provide for redundancy in the design.
In looking at the QoS requirements using a router (possibly using a 7500)
the GEIP link does mention support for the following - "Support for IP
Quality of Service (QoS)/Class of Service (CoS), including CAR, ACL and
MPLS/tag switching".
A couple of questions here would be..
A couple of questions here would be
1. What is the problem you are trying to solve? (I've always wanted to say
this...) :->
2. What type of analysis have been done to determine traffic flows(ftp,
smtp, multicast..etc)
3. QoS based on destination subnets ( How are the subnets being
determined)?
4 . The design suggest this is a P-t-P connection for an internal network.
Is it?
5 . The traffic that would be given QoS to the DA subnet to what? An
Application Server/Farm?
I'm currently reading for the second time a book recommended by Priscilla on
the list that I think may
provide you some insight in what you're trying to accomplish. The book's
author is James D. McCabe
and the title is Practical Computer Network Analysis and Design - ISBN
1558604987
HTH
Nigel
----- Original Message -----
From: "Chuck"
To:
Sent: Friday, May 24, 2002 10:59 AM
Subject: Friday Follies of sorts - answering questions [7:44952]
> I got to thinking about this after posting a question to a company
internal
> mailing list. Based on some of the responses I received from other
> engineers, I wondered at what point one has enough information to answer a
> question. At what point asking for further clarification is essentially a
> sign that you don't know the answer and you are just stalling.
>
> Please be assured, I am not looking for "the answer". I have what I need,
> including some working configs, which I will post to the list if there is
> enough interest.
>
> I am more interested in the opinions of any number of you folks whose
> insight I appreciate.
>
> So...... here is the e-mail I sent internally. My question is - given what
> you see, do you have enough information to provide an answer? If not, why
> not?
>
>
> Start question:
> ---------------------
>
>
> have a complex QoS traffic shaping rate limiting question.
>
> internet--->source_router--->gigE_port--->LX_fiber_connection--->gigE
> _port---->destination_router--->multiple subnets
>
> the customer wants to rate limit traffic across the fiber link based on
> destination ip subnet. I'm racking my brain trying to figure out how to
do
> this on something other than a frame or an ATM link. Can't seem to find
> the appropriate examples on CCO.
>
> Question - can one configure different QoS rate limits for different
> destination subnets over the same physical interface? All the example I
> find are for technologies that use PVC's. I had thought policy routing,
> using the route-maps to change TOS bits, and using map classes (?) to
> differentiate, but that severely limits the number of subnets I can
> manage.
>
> I have found some docs on CCO, but the examples center around MAC and IP
> precedence, not subnet.
>
> If you have reasonable expertise in QoS rate limiting, can you give me a
> call regarding the options I have?
>
> ---------------------
> end of question
>
>
> remember - I have what I need. I am just curious about the nature of
> questions and answers, and the clarification process required to provide
> answers. Call this a seminar in the design process, maybe?
>
> I look forward to your sage replies.
>
> Chuck
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