Re: [mpls-linux-general] MPLS ATM

[James R. L. <jl...@mi...>]

MPLS over ATM use AAL5NULL encapulation.  The (empty) shim is placed
right after the AAL5 header.

The vpi/vci or just vci are the label valued used for label switching.

It is poosible to use more then one label (stacking) by placing more
generic labels after the empty shim.  (ie there is always one empty label=
 value at the top of the label stack found in an AAL5 frame ... same hold=
s true for
frame relay).

Jim

On Fri, May 03, 2002 at 11:10:28AM +1000, Jack f wrote:
>=20
>=20
> Hi,
>=20
> I'm new to MPLS. I was wondering when implementing MPLS over ATM, where=
 is=20
> the MPLS header, in the VPI/VCI or just the VCI field of the ATM header=
?
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> If it's just using the VCI field, ATM should still be able to forward t=
he=20
> packet with just the VPI field right?
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> Thanks
> Jack
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--=20
James R. Leu