The MPLS WG Archive

[Shahram Davari <Shahram_Davari@pmc-sierra.com>]

Eric,

There are 2 types of MPLS over Ethernet:

1) The LSRs are routers but happen to have Ethernet interfaces,
in that case what you said is correct, we don't need the 802.1q 
since the MPLS label carries all the Diffserv Info.

2) The LSRs are Ethernet switches loaded with MPLS control-plane,
(like ATM-LSRs). In that case the Ethernet switches need to have
the capability for Diffserv queuing (aka 802.1q).

-Shahram

> -----Original Message-----
> From: Gray, Eric [mailto:egray@celoxnetworks.com]
> Sent: Monday, October 21, 2002 11:20 AM
> To: Shahram Davari; mpls@UU.NET
> Subject: RE: DiffServ MPLS over Ethernet (L-LSP vs E-LSP)
> 
> 
> Shahram,
> 
> 	I am not sure why you say this.  Certainly we
> can support Differentiated IP services, over MPLS, 
> without the need to rely on Layer 2 priority or VLAN 
> capability.
> 
> Eric W. Gray
> Systems Architect
> Celox Networks, Inc.
> egray@celoxnetworks.com
> 508 305 7214
> 
> 
> > -----Original Message-----
> > From: Shahram Davari [mailto:Shahram_Davari@pmc-sierra.com]
> > Sent: Monday, October 21, 2002 10:46 AM
> > To: 'Vishal M'; mpls@UU.NET
> > Subject: RE: DiffServ MPLS over Ethernet (L-LSP vs E-LSP)
> > 
> > Diffserv is not supported for non-802.1q networks.
> > 
> > -Shahram
> > 
> > > -----Original Message-----
> > > From: Vishal M [mailto:vishal_study@yahoo.com]
> > > Sent: Friday, October 18, 2002 10:03 PM
> > > To: mpls@UU.NET
> > > Subject: DiffServ MPLS over Ethernet (L-LSP vs E-LSP)
> > >
> > >
> > >
> > > Hi,
> > >
> > > If someone wants to use MPLS over ethernet and support
> > > DiffServ extensions for MPLS (i.e MPLS DS TE), can one
> > > still choose between using E-LSP or L-LSPs ?
> > >
> > > The reason for the doubt is:
> > > The Ethernet header (like ATM) doesn't have any QoS
> > > information field (unless 802.1q is supported). So
> > > does that imply that E-LSP can't be used when ethernet
> > > is the underlying media (and 802.1q is not supported).
> > >
> > > Is L-LSP the only choice then?
> > >
> > > Thanks for your inputs,
> > >
> > > Regards,
> > > Vishal.
> > >
> > >
> > > __________________________________________________
> > > Do you Yahoo!?
> > > Y! Web Hosting - Let the expert host your web site
> > > http://webhosting.yahoo.com/
> > >
>