From: Scott Morris (swm@emanon.com)
Date: Thu Dec 04 2003 - 21:54:49 GMT-3
Very true, but you also have to remember that it's a statistical thing,
and you deal with the "at any one point in time" idea of usage. Many
times, companies will oversubscribe a central location to a large amount
of remote offices. It's just that they aren't all active at one point
in time.
Reality strikes sometimes.
And the companies with 0k CIR "insist" that you can burst to port speed.
:)
Scott
-----Original Message-----
From: Todd Veillette [mailto:tveillette@myeastern.com]
Sent: Thursday, December 04, 2003 7:43 PM
To: Scott Morris; 'Brian Dennis'; 'Pun, Alec CL'; ccielab@groupstudy.com
Subject: Re: FR CIR ??
Huh? CIR is certainly a billable characteristic, but link speed would
equate to the port hard limit. So a full t1 max = 24 ds0 @ 64k =1536.
Having a CIR of anything above would be nice for the telco as far as
billing but you aren't going get any faster than the 1536Kb.
On the other hand the same t1 with a CIR pvc of 0Kb will bill nicely for
the client, and in all but the rarest cases be able to ustilize the
entire 1536Kb.
-TV
----- Original Message -----
From: "Scott Morris" <swm@emanon.com>
To: "'Brian Dennis'" <bdennis@internetworkexpert.com>; "'Pun, Alec CL'"
<Alec.CL.Pun@pccw.com>; <ccielab@groupstudy.com>
Sent: Thursday, December 04, 2003 12:33 PM
Subject: RE: FR CIR ??
> Absolutely, but also, it's possible to get service providers that are
> nice enough to "permit" you to purchase more CIR than your link speed.
> :)
>
> -----Original Message-----
> From: Brian Dennis [mailto:bdennis@internetworkexpert.com]
> Sent: Thursday, December 04, 2003 11:15 AM
> To: 'Scott Morris'; 'Pun, Alec CL'; ccielab@groupstudy.com
> Subject: RE: FR CIR ??
>
>
> <Quote>
> If you don't trust your service provider and provide a "just in case"
> option, then it becomes CIR and you'll still back off to something
> lower than that. </Quote>
>
> When shaping to the agreed upon CIR, there should not be a need to
> drop to a rate lower than the CIR. If you are not getting the rate
> you are paying for, don't just lower your rate. Your "just in case"
> option should be to contact the frame relay service provider and have
> them correctly provision your DLCIs ;-)
>
> Disclaimer:
> Of course you could theoretically have a lab scenario written by
> someone that didn't understand FRTS and maybe they would asked
> something like this
> ;-)
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Scott Morris
> Sent: Thursday, December 04, 2003 4:31 AM
> To: 'Pun, Alec CL'; ccielab@groupstudy.com
> Subject: RE: FR CIR ??
>
> As with everything else, it depends on your perspective!
>
> Guaranteed traffic is the bare minimum that you can push through the
> circuit, that your provider says will go through because you pay for
> it. It's the MinCIR from a purely theorhetical throughput scenario.
> Although if you aren't required to pay attention to BECNs and do any
> sort of backoff, it becomes your CIR. If you don't trust your service
> provider and provide a "just in case" option, then it becomes CIR and
> you'll still back off to something lower than that.
>
> If your link capacity is 128K, that is most likely your Access Rate,
> or full link speed. This is useful to know for the bandwidth command
> if you are doing any queuing stuff. It's also useful for calculating
> your be information in FRTS.
>
> Now, of course, there is always the human factor of it depends on who
> wrote the lab and what they were thinking. Check your lab diagrams
> for any information about clocking speeds of serial lines (hence your
> AR). Or, if in doubt of whether the "link capacity" means AR or not,
> ask the proctor. They are there to help!
>
> HTH,
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> CISSP, JNCIS, et al. IPExpert CCIE Program Manager IPExpert Sr.
> Technical Instructor swm@emanon.com/smorris@ipexpert.net
> http://www.ipexpert.net
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Pun, Alec CL
> Sent: Thursday, December 04, 2003 3:52 AM
> To: ccielab@groupstudy.com
> Subject: FR CIR ??
>
>
> If the question mentioned "The FR service provider is guaranteeing
> 32kbps of traffic", would you intepret as CIR or minCIR ? How about
> "FR access being provided by the service provider has a link capacity
> of 128kbps" ? Sometimes I am confused by the terms which one should be
> used.
>
> thanks
> alec
>
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