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**** > > ** ** >
- [ncrg] Recording of last NCRG meeting Michael Behringer (mbehring)
- Re: [ncrg] Recording of last NCRG meeting Rana Sircar
- Re: [ncrg] Recording of last NCRG meeting Michael Behringer (mbehring)
- Re: [ncrg] Recording of last NCRG meeting Rana Sircar
- Re: [ncrg] Recording of last NCRG meeting Michael Behringer (mbehring)