Re: [ncrg] Recording of last NCRG meeting

Rana Sircar <sircar.rana@gmail.com> Tue, 17 September 2013 08:54 UTC

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From: Rana Sircar <sircar.rana@gmail.com>
Date: Tue, 17 Sep 2013 14:24:04 +0530
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To: "Michael Behringer (mbehring)" <mbehring@cisco.com>
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Subject: Re: [ncrg] Recording of last NCRG meeting
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Hi Michael,

Thanks a lot. I would try to be there.

Meanwhile, to upload the papers, I tried creating a Login in Wiki. But
getting an error - "out of captcha images; this shouldn't happen"



Best Regards,
Rana Sircar
GSM+919899003705|


On 17 September 2013 14:02, Michael Behringer (mbehring) <mbehring@cisco.com
> wrote:

>  Rana, ****
>
> ** **
>
> Apologies for the late response, I’m very much under water at the moment.
> If you are on today’s NCRG call, I suggest we take the discussion there. I
> think you have very interesting ideas! ****
>
> ** **
>
> Thanks,****
>
> Michael****
>
> ** **
>
> ** **
>
> *From:* Rana Sircar [mailto:sircar.rana@gmail.com]
> *Sent:* 05 September 2013 16:26
> *To:* Michael Behringer (mbehring)
> *Cc:* ncrg@irtf.org
> *Subject:* Re: [ncrg] Recording of last NCRG meeting****
>
> ** **
>
> Hi Michael and Russ,****
>
> ** **
>
> In continuation to our discussion in the call the other day, I thought of
> jotting down my thoughts and proposal to define the problem space. We have
> already seen examples of Metrics as outlined by you earlier e.g., Cost,
> Bandwidth / delay / jitter, Configuration complexity, Susceptibility to
> Denial-of-Service, Security (confidentiality / integrity), Scalability etc.
> Russ highlighted multiple examples of pairs of Variables. Two aspects were
> ongoing in my thoughts as I heard you all - how do you define this
> Complexity and is there some standard term that we can borrow from Nature
> and other Complexity analysis as pointed out by David. ****
>
> ** **
>
> One Term that seems to be used across Natural world for measure of
> Information and disorder is Entropy. Thermodynamic Entropy is used to
> measure Disorder. Similarly Shannon entropy quantifies the expected value
> of the information contained in a message. Some authors have used
> multiscale entropy analysis to measure complexity of network traffic (see
> attached papers). As I explained the other day, I was looking at Entropy to
> measure the Complexity of networks. Ofcourse, we still need to define that.
> ****
>
> ** **
>
> Now, let us assume that Complexity of the Network is defined by a Function
> of many variables called "Network Entropy", such that the goal of every
> network designer would be to minimise this Function. Then, the goal of the
> Network complexity framework is: ****
>
> ** **
>
> Minimize [ Network Entropy (variable 1, variable 2, ....variable n)] ----
> our  Objective Function****
>
> ** **
>
> Now, we need to now formulate 'n' constrain equations for these variables:
> ****
>
> 1. Constraints of Cost (c1.....cn)****
>
> 2. Constraints of Control Plane State ****
>
> 3. Constraints of Optimal Forwarding State / Paths****
>
> 4. Constraints of Configuration State****
>
> 5. Constraints of Failure Domain Separation****
>
> 6. Constraints of Policy Architecture****
>
> 7. Constraints of Configuration State etc...etc...****
>
> ** **
>
> One aspect of draft-irtf-ncrg-network-design-complexity-00 that Russ
> presented is very interesting - we can have an initial state that is at a
> lower complexity level e.g., simple routing with simplest configuration and
> minimum number of subscribers and simple traffic floows due to basic level
> of services and Applications. Now as time grows, each of these become
> complex since more subscriber / Routers / Apps / Services etc. come in.
> Thus, clearly, we have an initial simple state of "Network Entropy" and
> future more complex state of this variable. ****
>
> ** **
>
> There are different deployment of Networks serving different purposes and
> goals. The Framework Document should provide Guidance for defining this
> overall approach to simulate and optimize / minimize the Network Entropy.
> Thus, based on the Usage, the Objective Function can be defined as well as
> the the constraints. ****
>
> ** **
>
> Hope that I was able to put across my thoughts...****
>
> ** **
>
> Best Regards,****
>
> Rana****
>
>
> ****
>
> Best Regards,
> Rana Sircar
> GSM+919899003705|****
>
> ** **
>
> On 5 September 2013 18:41, Michael Behringer (mbehring) <
> mbehring@cisco.com> wrote:****
>
> On Tuesday, Russ White presented his and Alvaro's draft, and we had some
> interesting discussion throughout the call.
>
> http://www.ietf.org/internet-drafts/draft-irtf-ncrg-network-design-complexity-00.txt
>
> The recording is available here:
>
> https://cisco.webex.com/ciscosales/lsr.php?AT=pb&SP=MC&rID=71094517&rKey=67cfc3967052661f
>
> Thanks Russ for the presentation.
> Michael
> _______________________________________________
> ncrg mailing list
> ncrg@irtf.org
> https://www.irtf.org/mailman/listinfo/ncrg****
>
> ** **
>