Re: Shaping - identical Bc & Be values

For the first document, I would not care that much. It calls Bc and Be
"rates" and they are not.
Confusing ? It might be, indeed. But you should be able to understand
it. I don't know why INE says that, but they are present in GS, so cast
a magic spell and ask them :)

-Carlos

Matt Sherman @ 21/06/2012 12:09 -0300 dixit:
> Here's one although not a Cisco doc.
> http://www.routeralley.com/ra/docs/qos_shaping_policing_efficiency.pdf
>
> Also INE Vol I workbook GTS section - "If the Be value is equal to Bc,
> then the excess burst is disabled." and also "By default, with legacy
> GTS, if you do not specify a Be value it is equal to Bc."
> And the link below and its examples state that they are limiting all
> output to a specific value but list the same burst and excess burst
> values and the "show traffic-shape" output also shows the Bc and Be
> values populated. So if you have Bc set at 64000 and Be also set to
> 64000 it would seem that this allows an excess burst of 64000 but
> apparently this is not the case. Really confusing.
> http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfgts.html
>
>
> GTS Enabled on the Interface Example
>
> This example shows the configuration of two traffic-shaped interfaces on
> a router. Ethernet interface 0 is configured to limit User Datagram
> Protocol (UDP) traffic to 1 Mbps. Ethernet interface 1 is configured to
> limit all output to 5 Mbps.
>
> access-list 101 permit udp any any
>
> interface Ethernet0
>
> traffic-shape group 101 1000000 125000 125000
>
> !
>
> interface Ethernet1
>
> traffic-shape rate 5000000 625000 625000
>
>
> On Thu, Jun 21, 2012 at 6:04 AM, Carlos G Mendioroz <tron_at_huapi.ba.ar
> <mailto:tron_at_huapi.ba.ar>> wrote:
>
> If Be = Bc, then you don't realy have much to burst, and it may be
> considered that it is just to compensate for some clocking hicups.
> That in policing. In shaping, I just don't know what sense does it make,
> not that any lab test makes any sense :)
>
> Would you mind sharing where you read this, if you keep the reference ?
> -Carlos
>
> Matt Sherman @ 20/06/2012 21:00 -0300 dixit:
>
> Hello,
>
> I was wondering if someone could clear this up for me. I've seen it
> written that if the normal burst (Bc) and excess burst (Be)
> values are
> equal, then excess
> burst is not allowed. So in the examples below, if the Bc and
> Be values
> are both 64000, does that mean there is no excess burst?
>
> GTS based Shaping
>
> Router(config-if)# traffic-shape rate 256000 64000 64000
> Class-Based Shaping with a policy-map:
> Router(config)# policy-map MYPOLICY
> Router(config-pmap)# class MYMAP
> Router(config-pmap-c)# shape 256000 64000 64000
>
> Thanks,
> Matt
>
>
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>
>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>>
> LW7 EQI Argentina
>
>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net