The MPLS WG Archive

[Yakov Rekhter <yakov@juniper.net>]

Mark,

> Hi Andy,
> 
> > I'm curious what additional functionality MPLS in L2TPv3 would get you that
> > GRE or direct IP encapsulation doesn't already provide.
> 
> The same two points given in the applicability statement of 
> draft-ietf-mpls-in-ip-or-gre-02.txt for MPLS-in-GRE vs. MPLS-in-IP hold for 
> MPLS-in-L2TPv3 vs. MPLS-in-IP. L2TPv3 also provides a method for thwarting a 
> blind packet insertion attack (in the absence of IPsec) via the Cookie in the
> L2TPv3 header.

The purpose of draft-ietf-mpls-in-ip-or-gre-02.txt is to define how
to run MPLS over (a) IP, and (b) over GRE. That is it.

It is *not* the purpose of the draft to define how to run MPLS over
all possible sorts of tunneling technologies (with L2TPv3 being
just *one* of such tunneling technologies).

Yakov.

P.S. One way to support MPLS over L2TPv3 is to use GRE as an
alternative encapsulation in L2TPv3.


> - Mark
> 
> >
> > At 8/29/2003 10:26 AM -0700, David Meyer wrote:
> >> One thing that would appear to be useful is to generalize the
> >> draft just a bit to  mpls-in-ip-encapsulation and include L2TPv3.
> >>
> >> Dave
> 
> 
> 
>