From: Ahmed Mustafa (ahmed.mustafa@sbcglobal.net)
Date: Mon Feb 09 2004 - 01:41:56 GMT-3
Michael/Bob,
Quick question for my knowledge.
How did you come up with Bc. I used the formula, but getting a different
value.
Tc = Bc/CIR
125 = Bc/ 32000
BC = 32000 x 125 =
Can you guys helpe me out here.
Thanks
Ahmed
----- Original Message -----
From: "Michael Snyder" <msnyder@revolutioncomputer.com>
To: <ccielab@groupstudy.com>
Cc: "'Bob Sinclair'" <bsin@cox.net>
Sent: Sunday, February 08, 2004 6:24 PM
Subject: RE: Quick question on Voip over Frame.
> Thanks Bob, Good catch.
>
> I used the cir speed for my math, and put it into bits.
>
> Double error, glad I'm not playing baseball. :)
>
> Checked the command reference, it's in bytes like you said, the ios help
> doesn't list it.
>
>
> So it is total bytes per second (port speed/8) times (millisecond
> interval/1000) = fragment size in bytes.
>
>
> -----Original Message-----
> From: Bob Sinclair [mailto:bsin@cox.net]
> Sent: Sunday, February 08, 2004 3:52 PM
> To: Michael Snyder; ccielab@groupstudy.com
> Subject: Re: Quick question on Voip over Frame.
>
> Michael,
>
> Since the frame-relay committed burst, Bc, is in bits and the fragment
> size
> is in bytes, I don't think it would be correct to say that the fragment
> size
> would equal the Bc.
>
> The Bc should be the number of bytes that can be sent per Tc at the link
> speed. For a 64000 bps link and a Tc of 10 milliseconds, that would
> be a
> fragment size of 80 bytes.
>
> 64000/8 X .01 = 80 bytes
>
> HTH,
>
> Bob Sinclair
> CCIE #10427, CISSP, MCSE
> www.netmasterclass.net
>
> ----- Original Message -----
> From: "Michael Snyder" <msnyder@revolutioncomputer.com>
> To: <ccielab@groupstudy.com>
> Sent: Sunday, February 08, 2004 4:11 PM
> Subject: Quick question on Voip over Frame.
>
>
> > Using the requirements for Voip
> >
> > Port Speed 64000
> > CIR 32000
> > Tc 10 ms
> >
> >
> > map-class frame-relay voip
> > frame-relay cir 32000
> > frame-relay bc 320
> > frame-relay be 0
> > frame-relay mincir 32000
> > no frame-relay adaptive-shaping
> > frame-relay fragment 320
> >
> >
> > fragment type end-to-end fragment size 320
> > cir 32000 bc 320 be 0 limit 40 interval 10
> > mincir 32000 byte increment 40 BECN response no
> > frags 22 bytes 1561 frags delayed 17 bytes
> delayed
> > 1201
> >
> >
> > 1) Will the fragment size always equal Bc?
> >
> > 2) Should I use the `frame-relay ip rtp priority 16384 16383 32` with
> my
> > class or add my own priority queue to the physical interface?
> >
> > There's no firm requirements, just trying to figure out a good way of
> > doing it.
> >
> >
> http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a
> > 00800d6788.shtml
> >
> >
> > Michael Snyder
> > Lead Network Engineer
> > CCNP/DP, CSS1, MCSE NT/2000
> > Revolution Computer Systems
> > (270) 443-7400
> >
> >
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