From: MADMAN (dave@xxxxxxxxxxxxxx)
Date: Wed Aug 14 2002 - 13:30:00 GMT-3
"Volkov, Dmitry (Toronto - BCE)" wrote:
>
> Hello group,
>
> Can somebody clarify on it finally ?????
>
> 1st Question:==========
>
> FRTS: 1)frame-relay CIR ; 2)frame relay MinCIR
> GTS: 3)traffic-shape rate CIR
>
> Is CIR from command 3) the same as CIR from command 1) ???
Yes
> Or it has to be interpreted as MiCir from command 2) (i.e. rate guaranteed
> rate obtained from provider) ???
>
> 2nd Question:==========
>
> What CIR You have to configure on Central site if You have Central site
> 1544000 and remote 64000 ????
> CCO says: http://www.cisco.com/warp/customer/125/21.shtml
> "If the central side has a upper limit of 256 kbps, you should use the
> LOWEST upper limit value"
> the same conception showed in the example at
> http://www.cisco.com/warp/customer/125/traffic_shaping_6151.html
>
> However, Solie and some other guys (i.e. MADMAN) tell "set CIR to be the
> phisycal port speed of the circuit at Central site"
I'd believe MADMAN :)
>
> I did look at archives this year and didn't find any good explanation .....
>
> 3rd Question: ==========
>
> According to
> http://www.cisco.com/warp/customer/125/traffic_shaping_6151.html and Solie :
> Be (excess burst) is the number of excess bits to transmit during the FIRST
> (???) interval (Tc) over and above Bc, once credit is built up.
>
> How Be has to be calculated, when we place Be under "frame-relay be" command
> :
> How many bits can be send over bc per Tc ?? or
> How many bits can we send over CIR during 1 second (i.e. spread in time)
> ??????
> The difference is 8 times if Tc=125 ms !
>
> Solie example: He did put Be 64000 on page 368 and 398 (so it doesn't look
> like typo) - I absolutely don't understand this.
>
> Can somebody explain that, please !!!
>
> CCO http://www.cisco.com/warp/customer/125/21.shtml said: PEAK = DLCI
> maximum speed = (Bc+Be)/Tc = CIR + Be/Tc = AR
>
> if be=64000 sec and bc =8000 sec that is mean that AR = 576000bits/sec but
> he mentioned that circuit on the far end only 64K.
>
> http://www.cisco.com/warp/customer/125/traffic_shaping_6151.html gives the
> following example:
> Circuit speed 192 K, Bc =8000 ; Tc=125, CIR=64000 ====> Be =192000/8 - 8000
> i.e. We can send 16000 bits over Bc 8000 bits during Tc only, which is equal
> to rate 192K=(16000+8000)/Tc !
>
> So, Be (as parameter in "frame-relay be" command) = bits during interval Tc
> tabove Bc limited by access rate ???
>
> Networkers 2002
> http://www.cisco.com/networkers/nw02/presos/pws/docs/PS-570.pdf at page 66
> gave wrong number for Be=32000 BPS ??? instead of Be=4000 BITS
Don't have the Solie book, can you phrase the question more concisely?
>
> 4th Question: ==========
>
> CCO http://www.cisco.com/warp/customer/125/traffic_shaping_6151.html said
> Frame-relay traffic shaping is enabled on the main interface, and it applies
> to all DLCIs under that interface. We cannot enable traffic shaping only for
> a particular DLCI or subinterface under the main interface. If a certain
> DLCI has no map class attached to it, and traffic shaping is enabled on the
> main interface, the DLCI is assigned a DEFAULT MAP-CLASS with CIR = 56000.
>
> So, If I enabled FRTS under physical interface I got default map class with
> CIR=56000 on all DLCI / subinterfaces
>
> What if I have 100 DLCs/subinterfaces and I want to implement shaping only
> on some of them ??
>
> How to do it ???
> I see only one way to do it: put DLCIs where I want to implemet shaping
> under separate subinterfaces and enable GTS on this subint.
> Any comments ???
>
> Thanks,
With FRTS you will need to create a map for each speed or the default
56K will be implemented. With GTS you can configure individual
interfaces and I think the main differance between FRTS and GTS is the
queueing mechanisms used.
Dave
>
> Dmitry
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