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Encapsulating MPLS in IP or GRE

  • From: Art King <art@frost-king.com>
  • Date: Thu, 15 Aug 2002 13:32:23 -0700
  • Cc: mpls@UU.NET, Loa Andersson <loa.andersson@utfors.se>, George Swallow <swallow@cisco.com>

Connecting MPLS VPN PE's over non-MPLS core in a Carrier is a
good example case for GRE usage.

----- Original Message -----
From: "Eric Rosen" <erosen@cisco.com>
To: "Shahram Davari" <Shahram_Davari@pmc-sierra.com>
Cc: <mpls@UU.NET>; "Loa Andersson" <loa.andersson@utfors.se>; "George
Swallow" <swallow@cisco.com>
Sent: Wednesday, August 14, 2002 11:27 AM
Subject: Re: Encapsulating MPLS in IP or GRE


>
> 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.
>