From: Chris Lewis (chrlewiscsco@gmail.com)
Date: Wed Dec 14 2005 - 23:38:54 GMT-3
The packet size for voice is defined by the codec you use, g.711, g.729 or
whatever, this is variable and some google searches will give you the
information if you're really interested, the packet size does varry
considerably though, so the answer to the first one I believe is no.
What the documentation is trying to say on the second question is that
priority queue packets will go out without having non PQ packets
interleaved, meaning that PQ packets go out first before any non PQ packets
get a chance. This is the designed operation as if shaping is enabled and
active, a queue is being built up and the PQ traffic always goes to the top
of that queue.
Chris
On 12/14/05, Balogh, Jim <jim.balogh@gwl.com> wrote:
>
> Two questions concerning fragmentation, interleaving and voice packets.
> I have been reading about the various forms of fragmentation (MLPPP and
> FRF.12) and understand that I do not want to fragment voice traffic.
> Here is the link I have been reading:
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hw
> an_c/ch05/hfrfrint.htm
>
> From the DocCD: "To maintain low latency and low jitter for
> high-priority traffic, the configured fragment size must be greater than
> the largest high-priority frames. This configuration will prevent
> high-priority traffic from being fragmented and queued behind
> lower-priority fragmented frames."
>
> So my first question....is there a standard packet size for voice? Or is
> there a minimum fragment size that we can specify that will be larger
> than voice packets?
>
> Next question concerns this statement from the DocCD: "Note that traffic
> from the priority queue will not be interleaved with fragments from the
> class-default queue because shaping is configured."
>
> If I configure shaping on my parent policy-map (to ensure I don't
> overdrive a slower-speed remote connection) does this mean I will not
> get interleaving? If this is the case, then what value is there in
> fragmenting large packets if I can't interleave voice packets?
>
> TIA
>
> Jim
>
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