From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Tue Aug 31 2004 - 09:48:29 GMT-3
The tx-ring would be a third stage, I was not taking that into
consideration, as it is there always. Actually, that is the one
triggering all this stuff (tx-ring being full "engages" all the more
sofisticated queueing mechs).
Take a look at
http://www.cisco.com/en/US/tech/tk543/tk544/technologies_tech_note09186a00800a4754.shtml
Lord, Chris wrote:
> Carlos,
>
> Please can you explain a little more about the 2nd stage (or send a url).
>
> My understanding is that stage 2 consists of a single tx-ring having a single FIFO queue and is the termination point for all L3 traffic shaping queues prior to the interface hardware. I was not aware from the Cisco docs that two parallel tx-rings could be created, one for priority traffic and the other for non-priority as you suggest.
>
> http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080103eae.shtml
>
> Kind regards,
>
> Chris.
>
> -----Original Message-----
> From: Carlos G Mendioroz [mailto:tron@huapi.ba.ar]
> Sent: 31 August 2004 10:51
> To: Jonathan R. Charles
> Cc: ccielab@groupstudy.com
> Subject: Re: Frame Relay Traffic Shaping
>
>
> Jonathan,
> without traffic-shapping in the interface, the router will send as much
> as it can as soon as it has it, up to AR (access rate, default T1).
>
> Once you set traffic-shapping, a two stage queueing starts. The first
> (in the order of data flow) is a per PVC shapping queue that defaults to
> 56k rate, and the second is a FIFO "merging queue".
> If you only have one PVC, then you'd better tune the first stage queue.
>
> First stage can be converted into a full blown CBWFQ + FRTS queue.
> (Actually one per PVC)
>
> Second stage can be converted into dual FIFOs by adding "frame ragment"
> to any PVC queue, in which case all priority queues traffic goes to one
> of the (parallel) second stage queues (priority) and the rest of the
> traffic goes to the other.
>
>
> Jonathan R. Charles wrote:
>
>
>>What is the default behavior without FRTS configured on a router?
>>
>>
>>
>>For example, let's say you have a DS-1, and a CIR of 256K, how will the
>>router transmit data (IOW, what are the defaults) if there is no FRTS
>>configured on the router? Will the router blast away at 1536kbps (with your
>>frame switch probably setting DE on everything above 256kbps) or will it
>>default to something else?
>>
>>
>>
>>If you do not configure CIR, minCIR, BC, BE et al, what happens?
>>
>>
>>
>>I read on the router ( cir Committed Information Rate (CIR),
>>Default = 56000 bps) that the default was a CIR of 56K, is this true? Is
>>this applied even if there is no map-class frame-relay configured and
>>applied to the interface?
>>
>>
>>
>>Also, on Cisco's web site, it says that the CIR is actually the access-rate,
>>while minCIR is the CIR you are actually paying for.
>>
>>
>>
>>Can anyone clarify?
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>Jonathan
>>
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>
>
-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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