System based on two layer VPN foreign medium communication and method thereof

Abstract

The present invention provides a system and method based on Layer 2 VPN heterogeneous media intercommunication, the core of which is: the local PE is connected to at least one local CE through a Layer 2 switching device, the ARP agent in the local PE terminates the ARP request of the remote CE, Do not send an ARP response to the ARP request of the local CE mutual visit, and perform ARP learning according to the ARP request of the local CE mutual visit; the packet forwarding module in the local PE encapsulates the IP packet in the local CE packet into an MPLS packet and forwards it to the The remote PE encapsulates the IP packet in the remote CE packet transmitted by the remote PE into a Layer 2 Ethernet packet, and transmits the Layer 2 Ethernet packet to the local CE according to the ARP information learned by the ARP agent . The present invention provides an economical and practical layer-2 VPN solution for small and medium-sized enterprises to realize remote interconnection of enterprise networks, especially point-to-multipoint heterogeneous media intercommunication similar to hub-spoke, and realizes point-to-multipoint layer-2 broadcasting The purpose of Layer 2 VPN heterogeneous media intercommunication in large-scale networks.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a system and method for intercommunication of heterogeneous media based on Layer 2 VPN. Background technique [0002] MPLS L2VPN (Multiprotocol Label Switching Layer 2 Virtual Private Network) provides Layer 2 VPN services based on MPLS networks. MPLS L2VPN enables operators to provide Layer 2 VPN services of different media on a unified MPLS network. The different media here include ATM (Asynchronous Transfer Mode), FR (Frame Relay), VLAN (Virtual Local Area Network), Ethernet (Ethernet), PPP (Point-to-Point Protocol), etc. [0003] In MPLS L2VPN, the concepts of CE (Customer Edge Equipment), PE (Provider Edge Equipment), and P (Provider Equipment) are similar to those in BGP / MPLS L3VPN (Border Gateway Protocol / Multiprotocol Label Switching Layer 3 Virtual Private Network) The concept is the same, and the principle of operation is basically the same. [0004] MPL...

AI Technical Summary

Problems solved by technology

[0011] From the above description, it can be known that the current networking mode of MPLS L2VPN heterogeneous media intercommunication can only realize point-to-point heterogeneous media intercommunication, and when the local CE and PE adopt CCC (circuit cross-connect) remote connection mode or SVC (switched virtual circuit) connection mode When connecting, L2VPN heterogeneous media intercommunication cannot be realized; moreover, since the PE does not dynamically update the MAC address learned by ARP when receiving the IP packet from the remote CE, the Ethernet interface of the PE needs to be configured with the MAC address of the remote CE. Address information, or use static ARP to set the MAC address information of the remote CE. The configuration process is complicated. If the CE replaces the network card or board, the MAC address information of the CE must be reconfigured on the PE. Otherwise, the L2VPN service will be caused. Inaccessible, so that the maintainability of L2VPN is poor, and it is not convenient to activate the actual L2VPN service

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