From: Dillon Yang (dillony@gmail.com)
Date: Mon Sep 05 2005 - 05:06:07 GMT-3
Hi, Arun:
I think the LFI is for the low-speed link, but in this case, the link is
10Mbps. So the PQ and LLQ is enough for VoIP. The author of the post writes
"The optimum situation is when the speed between them is 56k and the queue
is 640k." The former can be done by command
" priority 56", but the latter is strange for this :
<qoute>
queue-limit
Tospecify or modify the maximum number of packets the queue can hold for a
class policy configured in a policy map, use the queue-limit policy-map
class configuration command. To remove the queue packet limit from a class,
use the no form of this command.
queue-limit number-of-packets
no queue-limit number-of-packets
Syntax Description
number-of-packetsA number in the range from 1 to 64 specifying the maximum
number of packets that the queue for this class can accumulate.
</qoute>
I bebieve it should be "queue-limit 64", not "queue-limit 640k".
regards
dillon
----- Original Message -----
From: "Arun Arumuganainar" <aarumuga@hotmail.com>
To: <gladston@br.ibm.com>; <ccielab@groupstudy.com>
Sent: Monday, September 05, 2005 11:21 AM
Subject: Re: Re: How to guarantee the latency
> One way to guarantee latency is to use priority queuing along with LFI !!!
>
> Only with this way Voice packets can be given guaranteed Latency over
> slow
> speed link ...
>
> Note : Serialization delay at the hardware queue is very much significant
> on
> slow speed link such as < T1speed serial line !!! We need to rely on LFI
> to
> over come this scenario .
>
> In LFI configuration you can specify maximum delay for voice packet size .
> IOS will choose the fragment size based on the delay .
>
> By the way this works on ppp - multilink interfaces. However you use Frame
> Relay right ... Can you pls. confirm .
>
> Could you pls. let me know complete question statement . With some
> topology
> background ( i.e how routers are connected over the link latency need to
> be
> ensured ) .
>
> Thanks and Regards
> Arun
> ----- Original Message -----
> From: <gladston@br.ibm.com>
> To: <ccielab@groupstudy.com>
> Sent: Monday, September 05, 2005 3:57 AM
> Subject: Re: Re: How to guarantee the latency
>
>
>> John,
>>
>> Could you tell us what version do you used?
>>
>> ==============
>> quoted
>>
>> policy-map shape
>> class shape
>> shape average 56
>> shape holdq 640
>> ==============
>>
>> I could not find 'shape holdq':
>>
>> Rack2R2(config-pmap-c)#shape ?
>> adaptive Enable Traffic Shaping adaptation to BECN
>> average configure token bucket: CIR (bps) [Bc (bits) [Be
> (bits)]],
>> send out Bc only per interval
>> fecn-adapt Enable Traffic Shaping reflection of FECN as BECN
>> fr-voice-adapt Enable rate adjustment depending on voice presence
>> max-buffers Set Maximum Buffer Limit
>> peak configure token bucket: CIR (bps) [Bc (bits) [Be
> (bits)]],
>> send out Bc+Be per interval
>>
>>
>> Version tested is:
>>
>> C3640-JS-M, Version 12.2(15)T14
>>
>> _______________________________________________________________________
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>
> _______________________________________________________________________
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