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RE: Quick Question on Industry Standard
by Tim Devries 07 Apr '02

07 Apr '02

-----Original Message----- From: K. Graham [mailto:kgraham@rogers.com] Sent: Saturday, April 06, 2002 6:26 AM To: nanog(a)merit.edu Subject: Quick Question on Industry Standard >From my understanding there is a 99.97% up time value that most companies try and match. Is this a hard and fast rule or is this a value that we all try and emulate as best as we can? Do I have the value incorrect? Is it higher or lower? I had always thought that it was 99.97% but have not found anywhere to reference that figure, Cisco references that figure in their MTBF/MTTR (mean time before failure) calculations, however they also reference 99.9%. Our organization does not include scheduled maintenance in our HA (high availability) calculations, and I expect most organizations don't either. Quote, "Availability is calculated using statistical models for all the system components, the simplest model for a component being binary. The component is either in or out of service. Availability can be calculated from failure rates, measured in mean time between failures (MTBF), and repair times, measured in mean time to repair (MTTR)." Also, "The average downtime contribution by any component is calculated by amortizing the MTTR time over the MTBF period. For example, if a component critical to the operation of the platform has an MTBF of 250,000 hours and a MTTR of 1 hour, it contributes 2.1 minutes (60 min/250,000 hr/8760 hr/yr) of unavailability to the system per year" http://www.cisco.com/warp/public/cc/pd/rt/7500/prodlit/haibd_ov.htm So to calculate the physical HA stats, you need to reduce your network to component levels and do the calculations. Cables are not usually included in these calculations. HTH -- Tim

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More Questions of Exchange Points
by Ruomei Gao 07 Apr '02

07 Apr '02

Hi, I am a graduate student of computer science, now I am working on Internet exchange points. Following the discussion of exchange points last month, I have some more specific questions. 1, Some of the exchange points are layer 2 facilities, then why do they need register IP addresses? Furthermore, those IP addresses do appears in the traceroute traces (from the skitter data of caida). Does this mean that these IP addresses are actually in use? Then how the layer 2 exchange points work? 2, How do you categorize the exchange points into large/local IXs, transit/peering IXs (besides look into the peering policies)? From the number of participants? Or from who are the participants? Thanks. Ruomei Gao Email: gte489q(a)prism.gatech.edu

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Issues in Abovenet Backbone
by German Martinez 07 Apr '02

07 Apr '02

Is somebody affected with this outage ? http://west-boot.mfnx.net/traffic/issues.txt

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Quick Question on Industry Standard
by K. Graham 07 Apr '02

07 Apr '02

>From my understanding there is a 99.97% up time value that most companies try and match. Is this a hard and fast rule or is this a value that we all try and emulate as best as we can? Do I have the value incorrect? Is it higher or lower? I had always thought that it was 99.97% but have not found anywhere to reference that figure, it was just via talking with others and checking available uptime statistics. My understanding also takes into account that it does not include controlled downtime due to any maintenances. Any thoughts? Kim

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Anyone ever used calpop.com?
by Bill Sehmel 06 Apr '02

06 Apr '02

Has anyone ever had any experiences with calpop.com for colocation services? Please reply off list. Also sales people no need to reply as you'll be routed to /dev/null Thanks Bill Sehmel bsehmel(a)narrows.com

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RE: MAE-Phoenix info request
by Borchers, Mark 06 Apr '02

06 Apr '02

It's not a MAE. All MAE's are listed at http://www.mae.net/ There appears to have been a proposal last year for a meet-point in Phoenix for networks participating in a telemedicine project. Does not appear to be intended to exchange public Internet traffic. > I see from the great speadsheet (ep-in-addrs) that there is > mention of a > phoenix NAP. However, I can't find any info anywhere on the > web / etc about > it. > > Does it exist, either a MAE or otherwise? What's the physical > address? Who > is there? > > Offline answers are fine. > > -donn >

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Re: Quick Question on Industry Standard
by K. Graham 06 Apr '02

06 Apr '02

Thanks for the info Sameer but I do not work at Rogers :)) . I was a nocling but Rogers did not pick us up. I work with a private company now :)) > > Since you work at rogers, subscriber minutes is probably the preferred > measurement. Since an individual service outage is not likely to have a > significant impact on that regions total user base. > > > -----Original Message----- > > From: owner-nanog(a)merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of > > K. Graham > > Sent: Saturday, April 06, 2002 3:26 AM > > To: nanog(a)merit.edu > > Subject: Quick Question on Industry Standard > > > > >From my understanding there is a 99.97% up time value that most > > > > companies try > > and match. Is this a hard and fast rule or is this a value that > > we all try > > and emulate as best as we can? Do I have the value incorrect? > > Is it higher > > or lower? I had always thought that it was 99.97% but have not found > > anywhere to reference that figure, it was just via talking with > > others and > > checking available uptime statistics. My understanding also takes into > > account that it does not include controlled downtime due to any > > maintenances. > > > > Any thoughts? > > > > Kim

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Best provider to use ?
by mark＠noc.mainstreet.net 06 Apr '02

06 Apr '02

Actually, I didnt realize that calpop was a tier 1

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c
by Internet Guy 06 Apr '02

06 Apr '02

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c
by Internet Guy 06 Apr '02

06 Apr '02

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