[j-nsp] Ethernet Preamble and FCS on EoMPLS

Richard A Steenbergen ras at e-gerbil.net
Fri Sep 25 15:11:08 EDT 2009

On Fri, Sep 25, 2009 at 09:10:41AM -0300, Ruter Guike wrote:
> Hi List.
> Is Juniper able to include Ethernet "preamble" and "FCS" within the mpls
> packet, on EoMPLS? Is it configurable?
> AFAIK, these fields are removed, by default, before encapsulating...

Preamble and FCS are layer 1 overhead, they aren't part of the frame and 
can't be transported across MPLS or anything else. Not that there would 
be any point in doing so, they carry no information of value and will be 
recreated on the other side when transmitted again.

Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)

More information about the juniper-nsp mailing list