Network SLA

Holmes,David A dholmes at mwdh2o.com
Wed Apr 15 12:10:21 CDT 2009


>From the network operators' standpoint, designing a network that
operates at 50% utilization (without using ponderous QoS schemes)
assumes that there is no random queuing behavior in the network that can
result in dropped packets and large variations in packet arrival jitter.
An active measurement tool such as BRIX gathers empirical data for
packet drops and jitter from which accurate predictions about network
behavior can be made. Think of active measurement tools as a means of
implementing a scientific approach to determining network behavior. 

>From the users' standpoint, BRIX can be used to validate the service
providers' contractual SLA, and provide empirical data to support SLA
violation penalties.

-----Original Message-----
From: Saqib Ilyas [mailto:msaqib at gmail.com] 
Sent: Wednesday, April 15, 2009 4:11 AM
To: nanog at nanog.org
Subject: Re: Network SLA

Hmmm. Good point. Perhaps the Internet traffic gets only a small share
of
the link capacity and the rest is reserved for corporate clients' VPN
traffic etc. I was thinking more along the lines of corporate SLAs, not
for
Internet traffic.


On Wed, Apr 15, 2009 at 4:05 PM, Rod Beck
<Rod.Beck at hiberniaatlantic.com>wrote:

>  Congestion is more common than you think. And by the way, if
congestion
> is not a problem in Pakistan, then why is the VoIP qualit so poor?
>
> :)
>
> Roderick S. Beck
> Director of European Sales
> Hibernia Atlantic
> 13-15, rue Sedaine, 75011 Paris
> http://www.hiberniaatlantic.com
> Wireless: 1-212-444-8829.
> French Landline: 33+1+4355+8224
> French Wireless: 33-6-14-33-48-97.
> AOL Messenger: GlobalBandwidth
> rod.beck at hiberniaatlantic.com
> rodbeck at erols.com
> ``Unthinking respect for authority is the greatest enemy of truth.''
Albert
> Einstein.
>
>
>
> -----Original Message-----
> From: Saqib Ilyas [mailto:msaqib at gmail.com <msaqib at gmail.com>]
> Sent: Wed 4/15/2009 11:22 AM
> To: nanog at nanog.org
> Subject: Re: Network SLA
>
> I talked to the NOC personnel at a small (compared to North American
> standards) ISP in Pakistan. They said that their core links are
operating
> at
> less than 50% utilization most of the time. Under such conditions,
> violating
> SLA conditions in the core is unlikely. If such is also the case with
most
> service providers in the North America as well, then why would they
even
> use
> active measurement such as iPerf or BRIX or Cisco IP SLAs before
signing an
> SLA?
> Thanks and best regards
>
> On Thu, Feb 19, 2009 at 8:50 PM, Saqib Ilyas <msaqib at gmail.com> wrote:
>
> > Greetings
> > I am curious to know about any tools/techniques that a service
provider
> > uses to assess an SLA before signing it. That is to say, how does an
> > administrator know if he/she can meet what he is promising. Is it
based
> on
> > experience? Are there commonly used tools for this?
> > Thanks and best regards
> > --
> > Muhammad Saqib Ilyas
> > PhD Student, Computer Science and Engineering
> > Lahore University of Management Sciences
> >
>
>
>
> --
> Muhammad Saqib Ilyas
> PhD Student, Computer Science and Engineering
> Lahore University of Management Sciences
>
>


-- 
Muhammad Saqib Ilyas
PhD Student, Computer Science and Engineering
Lahore University of Management Sciences




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