From: Abidin Kahraman (kahramana@xxxxxxxxxxxxxxx)
Date: Mon Jun 24 2002 - 12:38:21 GMT-3
Ahmed thanks for your reply,
My understanding is shown below after your e-mail and reading of some
documents,
CIR = Maximum Data Rate or Peak Information Rate (if you exceed this value,
provider switch is setting the DE bit)
MinCIR = Carrier provided actual CIR or Minimum Information Rate (if you
exceed this value when the F/R cloud is congested, you are getting a BECN ),
the default value is CIR/2 in the routers.
Bc= CIR/8 if the time value is 125ms
Be= (CIR-MinCIR)/8 --> I am confused on this..Should we use time interval
when we are calculating Be???
Abidin.
-----Original Message-----
From: Ahmed Mamoor Amimi [mailto:mamoor@ieee.org]
Sent: Sunday, June 23, 2002 6:43 PM
To: Abidin Kahraman; ccielab@groupstudy.com
Subject: Re: FRTS
answers inline....
----- Original Message -----
From: Abidin Kahraman <kahramana@superonline.net>
To: Ahmed Mamoor Amimi <mamoor@ieee.org>; <ccielab@groupstudy.com>
Sent: Monday, June 24, 2002 2:33 PM
Subject: RE: FRTS
> Dear All,
>
> i`ve also confused on FRTS, my understanding about FRTS is shown below if
i
> am wrong please corect me..
>
> ** Frame-relay adaptive-shaping BECN --> If you are not connected to IGX
or
> BPX you have to use this command..(is it necessary for all configs?)
nope it is not necessary to use BECN in all configs and definitely not when
ur doing VOICE.
> ** Frame-relay cir --> Set this speed to be the physical port speed of the
> local circuit.
nope !! i was wrong on this AR is not equal to CIR.
Actually CIR is the max averge burst that u can give to the FR (above the
rate (mincir) that ur paying).
> ** Frame-relay bc --> This is the amount of data sent per interval. Cisco
> default is 1/8 CIR of the remote circuit.
Bc is calculated by minCIR and its formula is Bc=minCIR * 0.125 (1/8sec)
> ** Frame-relay be --> This is the number of extra bits remaining from
> previous burst that will be sent on the first interval. This should not
> exceed the port speed of the remote router..
not sure about this but be = CIR - minCIR (this is what i have observed)
Actually total bucket = CIR + Be
> ** Frame-relay mincir --> This is what the VC will throttle down to when
it
> receives BECNs. Set this value to the actual CIR that the carrier provides
> to you.
This is the minimum CIR that provider have gauranteed u.
> With the above explanations, i`ve prepared a template config..
>
> Map-class frame-relay XX
> Frame-relay adaptive shaping becn
> Frame-relay cir [local port speed]
> Frame-relay bc [remote port speed / 8] (if time interval is 125ms)
> Frame-relay be [remote port speed]
> Frame-relay mincir [carrier provided actual CIR]
>
as my understanding :
Map-class frame-relay XX
Frame-relay adaptive shaping becn
Frame-relay cir [Rate uptill u can burst]
Frame-relay bc [CIR * 0.125 or CIR/8] (if time interval is 125ms)
Frame-relay be [execess bursting that Provider have allowed u]
Frame-relay mincir [carrier provided actual CIR that he have promised u]
Please correct me if i am wrong !!
> -----Original Message-----
> From: Ahmed Mamoor Amimi [mailto:mamoor@ieee.org]
> Sent: Saturday, June 22, 2002 10:59 AM
> To: ccielab@groupstudy.com
> Subject: FRTS
>
> The more i learn the more i get confused on FRTS.
>
> i am taking this from scratch !!
>
> what is EIR :
> As per my understanding
> EIR = CIR - minCIR
> Total bucket = CIR + Be
> and Be = EIR (at 1 sec)
>
> is the above correct !!
>
> now i am taking an example :
> i want to buy 64k link and must be able to burst on a double when FR
is
> free :
> So my maths will be :
> minCIR = 64k
> CIR = 128k
> Tc = 0.125
> Bc = minCIR * 0.125
> Be = CIR * 0.125
>
> Now i have 2 way to feed the values into my router
> 1 - by giving the seprate values in map-class
> 2 - by using "frame-relay traffice-rate"
>
>
> 1 -
> map-class frame-relay FRTS-1
> frame-relay cir 128000
> frame-relay be 16000
>
> Interface Se0
> Access Target Byte Sustain Excess Interval Increment
Adapt
> VC List Rate Limit bits/int bits/int (ms)
> (bytes)
> Active
> 100 128000 4000 128000 16000 125
2000 -
>
>
> 2 -
> map-class frame-relay FRTS-2
> frame-relay traffic-rate 128000 144000 <---- CIR + (CIR + (Be or EIR) )
> that is 128000 + 16000 = PEAK
> no frame-relay adaptive-shaping
>
> Interface Se1
> Access Target Byte Sustain Excess Interval Increment
Adapt
> VC List Rate Limit bits/int bits/int (ms)
> (bytes)
> Active
> 200 128000 4000 128000 16000 125
2000 -
>
>
> Please confirm if the above configs are correct !!
>
>
> -Mamoor
This archive was generated by hypermail 2.1.4 : Tue Jul 02 2002 - 08:12:40 GMT-3