Re: [mpls-linux-devel] MPLS and Diffserv

[Fred P. <fre...@ya...>]

Hi James,

> When you really get into the guts of MPLS, it has nothing to do
> with DiffServ or QoS.

I was asking based on the field found in the MPLS spec that has 3
bits for QoS, and also because I got a request from someone who
wants to use MPLS along with Diffserv.  I'm currently using tc
and it offers quite a good deal regarding traffic control.  It's
quite flexible and I'm sure it can do what this person is asking
for.  But, the name Diffserv remains as a request and I think the
difference lies in the higher-level management inside a
domain (or multiple) domains and the consistent way of applying a
plan amongst the routers inside one or multiple domains.  In
other words, tc would provide the technical tool to do it inside
MPLS but the higher aspect of QoS, the Diffserv management
aspect, is left open.  Does thsi make sense ?

Thanks for any comments/sugegstions/etc...

Cheers,

Fred



--- On Thu, 10/30/08, James R. Leu <jl...@mi...> wrote:

> From: James R. Leu <jl...@mi...>
> Subject: Re: [mpls-linux-devel] MPLS and Diffserv
> To: "Fred Picher" <fre...@ya...>
> Cc: mpl...@li...
> Received: Thursday, October 30, 2008, 7:10 PM
> Hello Fred,
> 
> When you really get into the guts of MPLS, it has nothing
> to do with DiffServ or QoS.  MPLS just provides you a
> mechanism
> to make your decisions at the edge of the network and then
> at any
> future point along the LSP impose orthogonal traffic
> management
> by look just at the LSP or the EXP bits.
> 
> What this means to MPLS-Linux is that it plays well with
> Linux traffic management system (TC).  MPLS-Linux ILM and
> NHLFEs
> can have 'instructions' to mark packets in ways
> that the TC system
> can use to make queuing decisions.  In addition it can use
> the
> marks made by TC or other systems to make MPLS forwarding
> decisions.
> 
> At this time I do not know of any major MPLS-Linux bugs. 
> If you
> find one, bring it to the lists attention.
> 
> On Thu, Oct 30, 2008 at 11:09:50AM -0700, Fred Picher
> wrote:
> > Hello,
> > 
> >   I'm looking at integrating MPLS in a current
> Linux router and
> > I'm wondering how MPLS integrates the Diffserv
> part of MPLS
> > considering that seemingly all Linux Diffserv activity
> stopped at
> > around 2002.  Do the current MPLS offering has full
> Diffserv
> > integrated into it ?  How do you approach that aspect
> ?
> > 
> >   Also, how functionnal is the current MPLS ?  Any
> major bugs ?
> > 
> > Thanks,
> > 
> > Any comments/suggestions appreciated.
> > 
> > 
> > 
> > 
> >      
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> -- 
> James R. Leu
> jl...@mi...


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