Re: Burst Upto # FRTS

Ryan, sorry, I don't follow your argument.

Ryan West @ 28/05/2009 9:31 -0200 dixit:
> Carlos,
>
> When dealing with policing, there are the extra calculations that must be done to
>take into account the bursting. So, you end up with 1.5 x target bc
and 2 x target
>be values, which do not add up to AR, but over time still even out.

Hmm. "Bursting" is by definition not even over time.
And you may take 2 approaches to deal with it AFAIK:
-2 rate 3 color:
 You get a warning treatment if you go over 1st rate but below 2nd.
-1 rate + burst:
 You get some "extra" BYTES (or bits) credit you can use ONCE over your
rate. If you use them, you are out, until you go below rate and
replenish your credit.

This applies to shaping and or policing. And my thinking follows the
line that shaping has no place other than preventing policing, either
explicit or implicit (AR ?).

However, I don't think the same rules apply for traffic shaping in
Frame-Relay.
FR questions that mention burst to a # (typically AR) are implying
(bc+be)/tc to get there.

Here I remain guilty. I refuse to study for specific questions. I like
to study to understand what's going on... :) But yes, there may be some
de facto rules to calculate whatever with a short formula, and that
formula may have got its way to a cisco document, and so you may as an
expert be expected to know it. Too bad :(

-Carlos

>
> -ryan
>
> -----Original Message-----
> From: Carlos G Mendioroz [mailto:tron_at_huapi.ba.ar]
> Sent: Thursday, May 28, 2009 6:10 AM
> To: Ryan West
> Cc: S Malik; Cisco certification
> Subject: Re: Burst Upto # FRTS
>
> This is not always so simple, AFAIK.
> Be is not Tc related, so there is no way to specify a 2 rate 3 colour
> marker with just Bc & Be.
>
> -Carlos
>
> Ryan West @ 27/05/2009 11:47 -0200 dixit:
>> It does. If your AR = 128kbps, and your normal bc = 8000 with a tc = 125ms, then if you're bursting to AR, your be = 8000 as well.
>>
>> -ryan
>>
>> -----Original Message-----
>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of S Malik
>> Sent: Wednesday, May 27, 2009 10:41 AM
>> To: Cisco certification
>> Subject: Burst Upto # FRTS
>>
>> Can some one please explain "burst upto #" in FRTS?
>>
>> I thought, burst upto= Bc+Be in a Tc.
>>
>>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net