[Fwd: [e2e] Network optimization for bandwidth provisioning]

[=?gb2312?q?Jing=20Shen?=]

Thank you very much , and sorry for my poor question. 
Fraleigh's paper , " Provisioning IP Backbone Networks to Support Latency Sensitive Traffic",  stated that its analyis  is based on assumption that network topology and routing path remains in its original shape after link bandwidth is overprovisioned.  
My first question is:  Could we accept that assumption?  To my understanding , if link capacity is overprovisioned by 15%,  routing paths computed by SPF may deviate from that of original network.   
In order to verify its conclusion, my second question focuses on the bandwidth provisioning state of current backbone network and its edge-to-edge delay statics.     
Thanks again. 
Best regards 
  Tao Ye <tye at sprintlabs.com> wrote:I don't understand the first question, but for the second question, you 
can always look at Sprint's ipmon page for Sprint's backbone link 
utilization. 

For example, BW, utilization and other statistics of a number of backbone
links are available:

http://ipmon.sprintlabs.com/packstat

Delay statistics are available for several dates as well, such as 
2002/11/21.

http://ipmon.sprintlabs.com/delaystat

On Sun, 16 Mar 2003, Amgad Zeitoun wrote:

> 
> 
> 
> --__--__--
> 
> Message: 1
> Date: Sun, 16 Mar 2003 16:39:12 +0800 (CST)
> From: =?gb2312?q?Jing=20Shen?= 
> To: end2end-interest at postel.org
> Subject: [e2e] Network optimization for bandwidth provisioning
> 
> Hi,
> 
> I just read a paper published on InfoComm'03 named "Achieving 
> Near-Optimal Traffic Engineering Solutions for Current OSPF/IS-IS 
> Networks", it is stated that
> 
> only 15% BW overprovisioning is needed to guarantee as low as 3ms e2e 
> delay requirement.
> 
> My question is:
> 
> 1) a network optimization result with both network topology, routing 
> path preassumed reliable? How could we consider routing path changes 
> when link BW is overprovisioned?
> 
> 2) what's the state of link BW in current backbone network ? is there 
> more than 15% BW idled?
> 
> Thanks in advance.
> 
> 
> 
> 
> 
> 
> Jing Shen
> 
> State Key Lab of CAD&CG
> ZheJiang University(YuQuan)
> HangZhou, ZheJiang Province 310027
> P.R.China
> 
> 
> 
> 
> --__--__--
> 
> _
> 

-- 
ciao,

Tao


Jing Shen

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


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