The MPLS WG Archive

[Erblichs <erblichs@earthlink.net>]

FYI,

	I would like to add..

	* we are talking about the differential services model
	* the diff-servo model supports 6-bits in the IP header,
	  (which was part of the TOS byte) thus the max number 
	   of classes is 64..
	* each class type is defined as a Per Hop Behaviour (PHB)
	  which has the default as "best effort".
	-AF: Assured forwarding
	-EF: Expedited forwarding

	Mitchell Erblich
	Consultant/Sr Software Engineer
	-------------------------------
	

> "Khan, Amjad" wrote:
> 
> Yes MPLS supports COS+TE. you can use the traditional 8-classes of COS
> (IP TOS/DSCP; 802.1q/p) and map to the three EXP bits in the MPLS
> Header. If you need more classess of DSCP code then, it is also
> possible. I think in your case you need AF for voice and that should
> take care of prioritsing the voice over the 'other'  data traffic. You
> can classify other data traffic using EF codes.
> But it seems that your voice traffic  is sourced from a GPS network?
> This would require special gear at your network boundary..... You
> would need some special Gateways (check out Ericsson/Juniper solution
> for China Tel)
> 
> Regards,
> Amjad
> 
>      -----Original Message-----
>      From: mahmed [mailto:mahmed@tietec.com]
>      Sent: 04 September 2004 01:52
>      To: mpls@ietf.org
>      Cc: mahmed@tietec.com
>      Subject: [mpls] MPLS To Carry Voice Traffic
> 
>                                                   Dear Sir/Madam,
> 
> 
> 
>      I have a question, regarding the voice over MPLS backbone
>      performance?
> 
> 
> 
>      Currently, Is there a guarantee for the voice quality of
>      services to be carried over MPLS backbone,
> 
> 
> 
>      As an example, if a mobile operator would like to have MPLS
>      technology to be used in his backbone to carry voice traffic
>      , where the voice traffic is much higher than data traffic,
>      In such case , what shall be the QoS of voice traffic ? and
>      If the QoS for voice traffic is granted , do you have  a
>      list of GSM operators deployed MPLS technology to carry
>      voice traffic now.
> 
> 
> 
>      Best Regards,
> 
>      Medhat Ahmed
> 
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