[ippm] [e2e] Mathematical analysis of e2e lable switching path

alok alok.dube at apara.com
Fri Oct 4 12:33:01 PDT 2002

to add to his point,

i would really love a "document"  which poses responses to the "jitter"
problem for MPLS...or benchmarks on the same..

thats the only thing that can limit MPLS from sweeping over circuit switch
technologies today.

as we all know, MPLS strives to achieve the performance of a circuit
switched network over a packet switched network...


  ----- Original Message -----
  From: Jing Shen
  To: Kavé Salamatian ; end2end-interest at postel.org
  Cc: ippm at advanced.org
  Sent: Friday, October 04, 2002 2:23 PM
  Subject: RE: [ippm] [e2e] Mathematical analysis of e2e lable switching

  Thanks for all those response.

  To my limited knowledge on MPLS implementation, many Telecommunication

  have adopted MPLS in their service network, such as UUnet,  AT&T. In
China, ChinaTelecom has built up

  a experimental MPLS backbone accross multiple provinces, and China Unicom
also built up a backbone alike.

  In deed, it seems MPLS network is not put directly to commercial usage in
China but some of stuff in ChinaTelecom

  told me that they do care the VPN capacity,  TE capacity and high
performance promised by MPLS. The problem is

  the operators seem could not catch up with the complex configuration so
fast.  So, I don't understand

  why MPLS will not be used in large scale networks?

  To the performance difference between MPLS network and IP network, I
totally agree with you IP router have achieve

  the same performance with MPLS. But, to our experiments with comparation
between LSP and IP routing , there do exist

  some difference between LSP and IP routing. We've built a very small
testbed to compare difference between LSP& IP routing,

  and we found that LSP shows lower jitter and packet loss rate under
resource reservation scheme and best-effort service under low

  load. This is the reason why I asked the question.

  Best regards

    Kav¨¦ Salamatian <salamat at rp.lip6.fr> µÄÕýÎÄ£º

    Dear Shen,

    first of all I should mention that MPLS deployment is far from being
done (I
    don't think that it has been deployed even in a large network operator)
    I largely suspect that it will never be deployed in a large scale to be
    primary backbone technology !!!!

    From the point of view of measurement, LSP networks should not have too
    difference from traditional IP networks as nowadays IP routing
    is getting very close to Label switching performance, meaning that the
    delay of crossing an LSP network should not be significantly larger than
    IP network. The difference may come from a simpler traffic engineering
    MPLS. Meaning that we should evaluate the effect of traffic
    performance, not the particuliar behaviour of MPLS network.


    -----Message d'origine-----
    De?: ippm-admin at advance! d.org [mailto:ippm-admin at advanced.org]De la
part de
    Shen Jing
    Envoy¨¦?: dimanche 29 septembre 2002 04:28
    ¨¤?: end2end-interest at postel.org
    Cc?: ippm at advanced.org
    Objet?: [ippm] [e2e] Mathematical analysis of e2e lable switching path

    Hi there,

    I've some question on e2e performance analysis of
    label switching path.

    There has been many research on e2e performance
    analysis for IP routing. Nearly all of them take the
    model of "network of queue", and under assumpiton of
    Possion Arrival, exponential flow size etc. To my
    limited knowledge, this is not to the state of
    Internet which experiences LRD. On the other hand,
    different router archtecture must have different
    effect on transmission performance.
    As MPLS proceeds to be the primary backbone
    technology, I think there must be something new
    introduced into the e2e performance in internet.

    So, I want to know, whether there is some work with
    methematical! modeling of LSP networks? and, are there
    anyone would do me a favor to recommend some refrence
    book, web page, research paper or the like ?

    Thank you very much.

    Best regards

  Jing Shen

  State Key Lab of CAD&CG
  ZheJiang University(YuQuan)
  HangZhou, ZheJiang Province 310027

  Do You Yahoo!?
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