Subject: Re: Different between Pseudowire demultiplexor and Tunnel encapsulation

From: Stewart Bryant <[email-masked]>
Date: Fri, 03 Sep 2004 13:23:50 +0100

Linda Dunbar wrote:

>The Section 4.1.1 of  "draft-ietf-pwe3-ethernet-encap-07.txt" (Generic
>Procedures) indicate that NSP/Forwarder needs to prepend "Proper Pseudowire
>demultiplexor" and "proper Tunnel encapsulation".
>
>Could anyone tell me  what is the difference between the Pseudowire
>demultiplexor and Tunnel encapsulation, and the function of each?
>  
>

The tunnel encap get the packet across the PSN to the outbound PE.

The demux  encap tells that PE which PW the payload belongs to and hence 
which attachment
circuit it needs to go out on.

In an MPLS network they are both MPLS lables.

In a network using L2TPv3, the IP + L2TPv3 header provides the tunnel encap
and L2TPv3 session_id provides the PW Demux

- Stewart

>Thanks, Linda Dunbar
>
>
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