The MPLS WG Archive

[Brijesh Kumar <Brijesh@coronanetworks.com>]

Title: RE: MPLS tunneled in IP

Mary,

You are not missing any thing. It is called cyclic rediscovery.

First, it was "Foo over MPLS", now it is "MPLS over Foo". Till now, we only have MPLS over IP and  MPLS over GRE drafts - but wait till more drafts appear extolling the virtues and need of remaining possibilities- MPLS over L2TP, MPLS over PPP, MPLS over IPSEC etc... ;-).

There is no benefit of using these intermediate measures. As a matter of fact, such tunneling is adding unwanted layering as, in most cases, you would be  better off using the underlying tunneling mechanism minus MPLS shim header. I don't see why any carrier should deploy MPLS until their network is fully ready without using these stop-gap measures. The life span and real utility of these drafts is very limited.

Cheers,

--brijesh
(corona Networks Inc.

> -----Original Message-----
> From: Mareline Sheldon [mailto:marelines@yahoo.com]
> Sent: Monday, September 24, 2001 8:50 PM
> To: giles@packetexchange.net; kameswara.rao@ericsson.com
> Cc: Henry Bibb; 'mpls@uu.net'
> Subject: Re: MPLS tunneled in IP
>
>
> > > Hi,
> > >    What is the application of tunneling mpls over ip ? Since LSP's
> cannot be
> > > established through a non-mpls domain and the egress lsr's anyway
> perform
> > > the transformation from mpls->ip .
> > > Kamesh.
> >
> > But with MPLS over IP (or over GRE) LSPs *can* be
> established through a
> > non-mpls domain.  Use targetted LDP sessions ("extended
> discovery") or
> > BGP to exchange labels and then tunnel MPLS packets in IP
> or GRE to get
> > them from one device to the other...
>
> This much is okay .. but if you are using IP then how do you
> ensure that
> your TE specifications are met .. and if this is not ensured
> then the very
> use of MPLS is challenged !
> am i missing something ?
>
> Mary
>
>
>
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