questions about DVFS in saving energy

2009-05-13 Thread Kai Chen
Hi, could anyone here have some idea of the following questions about Dynamic Voltage/Frequency Scaling techniques used for energy efficiency, or please give a pointer that I can trace, 1) how many servers in the market support this technique? 2) how many voltages/frequencies can the servers suppor

question on BGP aggregation

2008-10-22 Thread Kai Chen
Hi, I observe some BGP AS paths collected from Routeview having the AS-set in the last hop. According to my understanding, this is BGP route aggregation. However, my question is as follows: Suppose, there is a path AS1 AS2 AS3 {AS4 AS5 AS6}, how AS4 AS5 AS6 connect to AS3? Does it necessarily mean

Re: question on BGP aggregation

2008-10-23 Thread Kai Chen
peaker is likely to have more > detailed path information and can distinguish individual paths > from destinations. > " > > --Ricardo > > On Oct 22, 2008, at 8:17 PM, Kai Chen wrote: > >> Hi, >> >> I observe some BGP AS paths collected f

Dmain names for the interfaces of a router

2008-11-09 Thread Kai Chen
Hi everyone, my question is that, in practice, if there are different interfaces (different IP addresses) on the same border router having different domain names? thanks.

question about BGP default routing

2009-01-05 Thread Kai Chen
Hi all I have a question: I see very few prefixes in a routing table and combining the prefixes does not cover addresses space, for example, {78.41.184.0/21, 91.103.239.0/24, 91.103.232.0/22, 82.138.64.0/23, 91.103.232.0/21, 77.95.71.0/24} are all prefixes I observed from a BGP speaking router, I

Re: question about BGP default routing

2009-01-05 Thread Kai Chen
Will this default route 0.0.0.0/0 be exporting to AS-level neighbors? On Mon, Jan 5, 2009 at 8:49 PM, Edward B. DREGER wrote: > KC> Date: Mon, 5 Jan 2009 18:05:48 -0600 > KC> From: Kai Chen > > KC> is this router using a default routing for all the other > KC> de

Can you see these AS links:)

2009-03-31 Thread Kai Chen
Hello folks, As part of a research project here at Northwestern, we have found quite a few unexpected AS-level links that do not appear in public available BGP tables. We really need your help in validating them; for anyone who knows links associated with any AS, if you can assist us with this plea

Re: Can you see these AS links:)

2009-04-01 Thread Kai Chen
ompleteness_tr.pdf> > > --Ricardo > > > On Mar 31, 2009, at 7:56 PM, Kai Chen wrote: > > Hello folks, >> As part of a research project here at Northwestern, we have found quite a >> few unexpected AS-level links that do not appear in public available BGP >> tables. We re

[NANOG] peering between ASes

2008-05-16 Thread Kai Chen
Hi, here is a quick question. 1. Beside public peering in IXP and private peering between two dedicated ASes, are there any other interconnection models in the current Internet? 2. How does private peering implement, just a router from each AS and a link inbetween? Do they have multi-access in one

Re: [NANOG] peering between ASes

2008-05-16 Thread Kai Chen
2008/5/16 Joel Jaeggli <[EMAIL PROTECTED]>: > Kai Chen wrote: > >> Hi, here is a quick question. >> 1. Beside public peering in IXP and private peering between two dedicated >> ASes, are there any other interconnection models in the current Internet? >&

Is the export policy selective under valley-free?

2008-09-02 Thread Kai Chen
Just want to ask a direct question. Will an AS export all it gets from its customers and itself to its providers? Or even under valley-free, the BGP export policy is also selective? Thanks a lot, -- -Kai

Re: Is the export policy selective under valley-free?

2008-09-03 Thread Kai Chen
On Wed, Sep 3, 2008 at 4:29 AM, William Waites <[EMAIL PROTECTED]> wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > Le 08-09-03 à 11:08, Iljitsch van Beijnum a écrit : > >> On 3 sep 2008, at 1:45, Kai Chen wrote: >> >>> Just want to ask a dire