Re: AToM header

Hi Vishal,

MPLS is indeed a "layer 2.5" protocol, which means the MPLS header sits
between the L2 header and the L3 header. Within the MPLS header itself you
have one or more MPLS labels referred to as a label stack. Certain MPLS
applications like L3 VPN and AToMPLS work by using more than one label in
this stack.

Hope that helps

On Fri, Apr 26, 2013 at 5:36 AM, vishal bhugra <vishal.bhugra_at_gmail.com>wrote:

> Hello experts
>
> While studying the MPLS I came across the AToM. It states that AToM is
> basically to provide layer 2 connectivity to customer. When reading the
> data plane communication of the AToM the explanation given is while packet
> comes to ingress PE, it will put 2 labels on it VC label and tunnel label.
>
>
> *Now my Query are as :-
>
> 1) MPLS is 2.5 shim header. How can I say label over L2 Frame ?
>
> *
> *2) Control Word is a 32 bit field inserted between layer and VC label,
> again how this is possible based on my above query ?*
>
>
>
>
> --
> Thanks&regards
>
> Vishal
> +91 8587900305
>
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> Thanks&regards
>
> Vishal
> +91 8587900305
>
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