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Cell Relay Retreat>MPLS WG Archive>month:2002-Aug> msg00086



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Encapsulating MPLS in IP or GRE

  • From: Eric Rosen <erosen@cisco.com>
  • Date: Wed, 14 Aug 2002 14:27:36 -0400
  • cc: mpls@UU.NET, Loa Andersson <loa.andersson@utfors.se>, George Swallow <swallow@cisco.com>
  • User-Agent: EMH/1.14.1 SEMI/1.14.3 (Ushinoya) FLIM/1.14.3(Unebigoryōmae) APEL/10.3 Emacs/21.2(sparc-sun-solaris2.6) MULE/5.0 (SAKAKI)


In some  cases you  might already have  a GRE  tunnel through which  you are
supporting a routing adjacency.  It should be possible to send MPLS packets,
as  well  as  IP  packets,  through  such  tunnels,  and  this  requires  an
MPLS-in-GRE encapsulation. 

There are also  other cases in which GRE tunnels (as  opposed to IP tunnels)
are  commonly used,  and you  should be  able to  send MPLS  packets through
them.