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Apparatus and method for interworking between MPLS network and non-MPLS network

  • US 7,633,954 B2
  • Filed: 10/07/2005
  • Issued: 12/15/2009
  • Est. Priority Date: 06/02/2000
  • Status: Expired due to Fees
First Claim
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1. A packet transfer device that interworks a multiprotocol label switching (MPLS) network which uses a MPLS protocol, and a network that does not use said MPLS protocol,wherein in said MPLS network, packet switching is performed by a MPLS header which is added before a header of a layer corresponding to layer 3 of the Open System Interconnection (OSI) model,wherein, in a network which does not use said MPLS protocol, packet switching is performed by a header of the layer corresponding to layer 2 of the OSI model, which is different from said MPLS header and is added before said layer 3 header, andwherein said packet transfer device comprises:

  • a first physical port which receives a packet that is transmitted from the network which does not use said MPLS protocol,a second physical port for connecting with said MPLS network,a memory that stores header transformation information that shows correspondence between a pair of information in said layer 2 header and information in said layer 3 header in correspondence with information in said MPLS header, anda processor that searches said header transformation information and adds said MPLS header corresponding to said layer 2 header to the packet.

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