From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Tue Aug 31 2004 - 13:37:52 GMT-3
Yes, all PVCs run independent FRTSs queues, and they have their own
shaping counters, etc...
Lord, Chris wrote:
> ok... next question ... is it correct to conclude that there is a Bc/Be token bucket mechanism for each VC and that tokens are removed as packets are de-queued from the VC WFQ's into the interface FIFO's ?
>
> Thx,
>
> Chris.
>
> -----Original Message-----
> From: Carlos G Mendioroz [mailto:tron@huapi.ba.ar]
> Sent: 31 August 2004 13:48
> To: Group Study
> Subject: Re: Frame Relay Traffic Shaping
>
>
> 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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