The MPLS WG Archive

[Anoop Ghanwani <anoop@lanterncom.com>]

If you send out MPLS packets, it means you have terminated
the MAC domain and therefore the Ethertype is removed along
with the rest of the original MAC header.  

An exception is if you use MPLS to provide L2 VPN service
for Ethernet frames.  In that case, the entire Ethernet
frame is encapsulated within an MPLS header, and if going
out over Ethernet, you would have a separate "outer" MAC 
header.

-Anoop

> -----Original Message-----
> From: Fu, Jingsong [mailto:JFu@ciena.com]
> Sent: Wednesday, October 31, 2001 3:57 PM
> To: MPLS Mailing List
> Subject: encapsulate a labeled frame on ethernet - rfc3032
> 
> 
> 
> 
> When encasulating a label frame ove ethernet, 0x8847/0x8848 
> is uesed in
> ethertype to indicate that a frame is MPLS packet. Where should be the
> original ethertype, or is it removed?
> 
> Thanks,
> 
> Jingsong Fu
>