From: John Underhill (stepnwlf@magma.ca)
Date: Thu Dec 04 2003 - 11:20:45 GMT-3
MinCIR is usually the rate the line will drop to when receiving BECNs. CIR
is the guaranteed bandwidth from the provider. BE are token credits used on
the first TC interval, if CIR is less then AR. BC are the number of bits
sent during a TC interval.
Here's a link..
http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a00800d6788.shtml
----- Original Message -----
From: "Jans van Deventer" <jano@rhox.com.br>
To: "Scott Morris" <swm@emanon.com>
Cc: "'Pun, Alec CL'" <Alec.CL.Pun@pccw.com>; <ccielab@groupstudy.com>
Sent: Thursday, December 04, 2003 7:44 AM
Subject: Re: FR CIR ??
> Ok, I agree with everything that Scott wrote, and I have one more
question:
>
> MinCIR is the minimum that the provider guarantees will get through the
> network. But it is possible to send bursts when there is enough
> bandwidth available in the network. What mechanism is used to tell the
> router that it can send bursts? Does it only depend on your be, bc, and
> Tc values?
>
> Regards,
> Jans
>
> Scott Morris wrote:
>
> >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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>
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