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@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@hiberniaatlantic.com rodbeck@erols.com ``Unthinking respect for authority is the greatest enemy of truth.'' Albert Einstein.
-----Original Message----- From: Saqib Ilyas [mailto:msaqib@gmail.com <msaqib@gmail.com>] Sent: Wed 4/15/2009 11:22 AM To: nanog@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@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
On Wed, Apr 15, 2009 at 7:10 AM, Saqib Ilyas <msaqib@gmail.com> wrote:
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.
For private, point to point, line, I agree with a previous posting on the subject: "As for the rest, CIR, Latency, Jitter, Loss ..... this can be tested prior to customer handover with any number of tools and protocols including IEEE 802.11ag/ah, ITU-T 1731, IETF RFC2544. " -Rich Andreas Asking to receive the testing report as part of an acceptance process is not unusual. For corporate IP service, you may want to measure end to end performance and not get too specific in the core. Writing an SLA against city pair performance is a responsible method to do this e.g. "Islamabad->Kabol not equal to more than 1ms". That should encompass everything along the required path(s) and hopefully incent your provider to keep their network up to snuff and their MTTR low. You may also consider codifying the MTTR i.e. MTTR = < 2 Hours "or" service credit. (Again, depends on your economic power). Don't forget that your power to negotiate SLA's with service credits is proportionate to the size of the purchase. Buying 10 Mb/s vs. 10 Gb/s services are two different types of economics when it comes to SLA. Best, Martin -- Martin Hannigan martin@theicelandguy.com p: +16178216079 Power, Network, and Costs Consulting for Iceland Datacenters and Occupants
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.
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@hiberniaatlantic.com rodbeck@erols.com ``Unthinking respect for authority is the greatest enemy of truth.'' Albert Einstein.
-----Original Message----- From: Saqib Ilyas [mailto:msaqib@gmail.com <msaqib@gmail.com>] Sent: Wed 4/15/2009 11:22 AM To: nanog@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@gmail.com> wrote:
Greetings I am curious to know about any tools/techniques that a service
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
-----Original Message----- From: Saqib Ilyas [mailto:msaqib@gmail.com] Sent: Wednesday, April 15, 2009 4:11 AM To: nanog@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@hiberniaatlantic.com>wrote: provider 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
participants (3)
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Holmes,David A -
Martin Hannigan -
Saqib Ilyas