From: Wayne Hines (wayneh@DataNetDev.com.au)
Date: Sat Apr 19 2003 - 09:37:15 GMT-3
1) Credit for typo/thinko accepted!
2) If this was entered (and if there was only 1 spoke) am I correct in
assuming that this would prevent BECNs from ever being set?
3) If frame bc 8000 was entered, would this mean that the hub would
send at 64Kbps (average) and BECNs would as required adjust this down to
32KBps?
Wayne
-----Original Message-----
From: OhioHondo [mailto:ohiohondo@columbus.rr.com]
Sent: Friday, 18 April 2003 11:12
To: wayneh@DataNetDev.com.au; 'OhioHondo'; 'Jeongwoo Park'; 'Jonathan V
Hays'; 'Brian McGahan'; ccielab@groupstudy.com
Cc: 'Mike Williams'
Subject: RE: MINCIR = CIR?
Wayne
Given the following and assuming Tc= 125msec:
map-class frame Shape32
frame traffic-shaping adaptive becn
frame bc 4000
frame be 0
frame cir 1544000
frame mincir 32000
Bc=cir/Tc= 1536000/8 or 1536000 x .125 (use 1544000 if you want)
Bc should be 1536000 x .125 --- which is much larger than 4000.
-----Original Message-----
From: Wayne Hines [mailto:wayneh@DataNetDev.com.au]
Sent: Thursday, April 17, 2003 8:31 PM
To: 'OhioHondo'; 'Jeongwoo Park'; 'Jonathan V Hays'; 'Brian McGahan';
ccielab@groupstudy.com
Cc: 'Mike Williams'
Subject: RE: MINCIR = CIR?
Re TYPO - Yes - but not on my part in quoting Solie!!
Re - Bc should NEVER be higher than cir. - thanks understood
-----Original Message-----
From: OhioHondo [mailto:ohiohondo@columbus.rr.com]
Sent: Friday, 18 April 2003 10:01
To: wayneh@DataNetDev.com.au; 'OhioHondo'; 'Jeongwoo Park'; 'Jonathan V
Hays'; 'Brian McGahan'; ccielab@groupstudy.com
Cc: 'Mike Williams'
Subject: RE: MINCIR = CIR?
Wayne
There must be a typo.
Bc should NEVER be higher than cir.
-----Original Message-----
From: Wayne Hines [mailto:wayneh@DataNetDev.com.au]
Sent: Thursday, April 17, 2003 6:46 PM
To: 'OhioHondo'; 'Jeongwoo Park'; 'Jonathan V Hays'; 'Brian McGahan';
ccielab@groupstudy.com
Cc: 'Mike Williams'
Subject: RE: MINCIR = CIR?
Local Port Speed of R2 (other router)is 1.54Mb[ps]
!Solie says
map-class frame-relay mymap
frame-relay cir 32000
frame-relay bc 155400
frame-relay be 0
frame-relay adaptive-shaping becn
!should this be (assuming Tc=0.125)
map-class frame Shape32
frame traffic-shaping adaptive becn
frame bc 4000
frame be 0
frame cir 1544000
frame mincir 32000
Noting other end has multiple PVCs/subinterfaces. Assume this to be the
only PVC on this subinterface. Map class is than applied to subinterface.
-----Original Message-----
From: OhioHondo [mailto:ohiohondo@columbus.rr.com]
Sent: Thursday, 17 April 2003 17:43
To: Jeongwoo Park; 'Wayne Hines'; 'Jonathan V Hays'; 'Brian McGahan';
ccielab@groupstudy.com; 'OhioHondo'
Cc: 'Mike Williams'
Subject: RE: MINCIR = CIR?
Without any other info I say yes, change it to number 2.
The max output of number 1 is [Be+ 8(Bc)]=40K
The max output of number 2 is [Be+8(Bc)]=64K
Note that information from both sides of the pvc paint the entire picture.
-----Original Message-----
From: Jeongwoo Park [mailto:jpark@wams.com]
Sent: Thursday, April 17, 2003 3:30 AM
To: 'Wayne Hines'; 'Jonathan V Hays'; 'Brian McGahan';
'ccielab@groupstudy.com'; 'OhioHondo'
Cc: 'Mike Williams'
Subject: RE: MINCIR = CIR?
Ohio, and guys,
Should this config (Config 1) below from Wayne be corrected to Config 2?
!!Config 1
map-class frame Shape32
frame traffic-shaping adaptive becn
frame bc 4000
frame be 4000
frame cir 64000
frame mincir 32000
!!Config 2
map-class frame Shape32
frame traffic-shaping adaptive becn
frame bc 8000
frame be 0
frame cir 64000
frame mincir 32000
This topic is getting more interesting. :-) Let's nail it down.
JP
-----Original Message-----
From: Wayne Hines [mailto:wayneh@DataNetDev.com.au]
Sent: Wednesday, April 16, 2003 10:56 PM
To: 'Jonathan V Hays'; 'Brian McGahan'; ccielab@groupstudy.com
Cc: 'Mike Williams'
Subject: RE: MINCIR = CIR?
So, based on this discussion, it would appear that Solie's book requires
a[nother] correction??
!for Darth Reid Lab, P1149, Section III 4.
!FRTS on PVC between R1 R2
!Carrier CIR is 32K, Local Port Speed is 64K
!Solie says
map-class frame-relay mymap
frame-relay cir 32000
frame-relay bc 64000
frame-relay be 0
frame-relay adaptive-shaping becn
!by default
!frame-relay mincir 16
!should this be (assuming Tc=0.125)
map-class frame Shape32
frame traffic-shaping adaptive becn
frame bc 4000
frame be 4000
frame cir 64000
frame mincir 32000
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Jonathan V Hays
Sent: Thursday, 17 April 2003 11:00
To: 'Brian McGahan'; ccielab@groupstudy.com
Cc: 'Mike Williams'
Subject: RE: MINCIR = CIR?
> -----Original Message-----
> From: Brian McGahan [mailto:brian@cyscoexpert.com]
> Sent: Wednesday, April 16, 2003 1:33 PM
> To: 'Jonathan V Hays'; ccielab@groupstudy.com
> Cc: 'Mike Williams'
> Subject: RE: MINCIR = CIR?
>
[snip]
> The following formulas hold true for Cisco's
> implementation of Frame-Relay Traffic Shaping:
>
> Bc = (CIR * Tc)/1000
> Be = ((AR - CIR) * Tc)/1000
>
Brian,
What units are you using to require division by 1000? Most Cisco documents
seem to give Bc= CIR * Tc.
http://www.cisco.com/en/US/tech/tk713/tk237/technologies_configuration_e
xample09186a00800942f8.shtml
See the document I cited in my earlier post (included above) under
"Nonconfigurable parameters - interval (Tc)" -
--- "The time interval during which you send the Bc bits in order to maintain the average rate of the CIR in seconds.Tc = Bc/CIR in seconds.
The range for Tc is between 10 ms and 125 ms." --- In the example given in the Cisco document, Bc is 8000 bits, CIR is 64000 bps, then Tc = 8000 bits / 64000 bps = 1/8 second.
Or if you use Bc = CIR * Tc, then Bc = 64000 bps * 1/8 second = 8000 bits.
What does dividing by 1000 get me?
Thanks.
This archive was generated by hypermail 2.1.4 : Thu May 01 2003 - 13:35:58 GMT-3