The MPLS-OPS Archive

[RickGall1@aol.com]

Hi Jamal,

To achieve end to end QoS is about as simple as making a pig fly .... but it can be done....What we need to establish is the equivele to virtual circuit from end to end.  It will require end to end coordination and carriers to work together.  


> 1) IF you have win 2000 at the PC level use 802.1Q/P and map the application to a priority level.  


1b) If you do not have win 2000 you can still map a switch port.

2)  From the switch map the
> vlan to a priority and tag using 802.1Q.  (layer 2) 


3)In the router map from the layer 2 to layer 3 Difserv.  

4) At the LER map Difserv to
> MPLS.
>
> This is where it becomes more difficult.  Difserv has 12 selections if you count the class and the drop precedence.  Some have chosen to use the experimental bits on the MPLS header to group Difserv.  However this may not give you the level of granularity you need.
>
> Others map Difserv directly to a label that relates to an FEC.  Inserv and RSVP can also be used on the circuit.
>
> There are some RFCs and Draft RFCs that address the mapping of DifServ to MPLS.

"MPLS Support of Differentiated Services", Bruce Davie, Juha Heinanen, Pasi Vaananen, Liwen Wu, Francois Le Faucheur, Pierrick Cheval, Ram Krishnan, Shahram Davari, 04/27/2001. (129885 bytes) 


I hope this helps..

Yours Truly
Rick Gallaher
www.rickgallaher.com