From: dusth@comcast.net
Date: Wed Nov 02 2005 - 11:52:49 GMT-3
You can always configure the class-map not to match voice traffic and apply on the map-class frame-relay so voice won't be fragemented. IE workbook has excellent exercise on this topic.
-------------- Original message --------------
> Dave,
>
> At the default of 53 bytes there is still the possibility of voice packets
> being fragmented. There are many variables as to what size the voice packet
> will be, for example codec used (G.729 etc), sampling rate, whether cRTP is
> being used. So your voice packet could be larger than 53 bytes and thus get
> fragmented.
>
> With respect to priority queueing, when you enter the frame fragment command
> the interface changes to the dual fifo paradigm. Small (unfragmented)
> packets get delivered to a high priority queue and fragmented packets get
> delivered to a low priority queue. Unfragmented packets can be anyhing
> below the fragment size and not just voice packets. If you wish to make
> sure that 'only' voice packets go to the high priority queue, then use the
> following command
>
> ip rtp priority (rtp port range)
>
> This will then deliver both LMI and voice packets to the high priority
> queue.
>
> The following link provides further information
>
> http://www.cisco.com/en/US/tech/tk543/tk544/technologies_tech_note09186a0080
> 0a4754.shtml
>
> HTH
>
> Simon
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Schulz, Dave
> Sent: 31 October 2005 22:05
> To: ccielab@groupstudy.com
> Subject: Frame-Relay fragmentation
>
>
> I was working through the doc CD, where it stated something about the
> FRF.12 inherently allows all voice traffic to pass-through unfragmented,
> while fragmenting the data packets to the specific length. So, can I
> assume that if a lab states to fragment all packets above 53 bytes (the
> default), and allow voice to be unfragmented....then you may simply
> configure "frame-relay fragment" command under the specific frame
> map-class or interface, along with the frame-relay traffic-shaping
> interface command?
>
> I almost want to believe that priority queuing is needed, but am
> confused on which way to go here (sometimes we make things more
> complicated then they really are). Thoughts?
>
>
> Dave Schulz,
> Email: dschulz@dpsciences.com
>
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