Abstract: A method for accessing VPN using PW Emulation Edge-to-Edge Virtual Leased Line includes: configuring a first PW ID in a first Provider Edge Device that hosts a VSI, and an IP address of a second Provider Edge Device that hosts an PW Emulation Edge-to-Edge Virtual Leased Line associated with the PW ID; sending a second PW ID of the second Provider Edge Device to the first Provider Edge Device; determining whether the second PW ID of the second Provider Edge Device matches the first PW ID of the first Provider Edge Device, if it matches, setting the state of the PW between the first Provider Edge Device and the second Provider Edge Device; delivering a Forwarding Table by the first Provider Edge Device; establishing a bi-directional connection between the PW Emulation Edge-to-Edge Virtual Leased Line and the VSI. A Virtual Private System, a first Provider Edge Device, and a second Provider Edge Device are also provided.

Abstract: A communication method for interworking of local heterogeneous link protocols, includes the following steps: when the type of an input interface of a data packet is a predefined type, remove link layer information of the data packet according to a link protocol of the input interface; transmit the data packet to an output interface; a Provider Edge (PE) encapsulates the data packet according to a link protocol of the output interface and transmits the encapsulated data packet through the output interface. The present invention also discloses a communication apparatus for interworking of local heterogeneous link protocols, including: an input interface, an output interface and a data processor. The present invention processes data packets from specific interfaces and directly transmits the data packets to output interfaces, thereby implementing the interworking of local heterogeneous link layer protocols and smooth upgrading of networks.

Abstract: A method for implementing hierarchical Virtual Private LAN Service (VPLS), includes: using Border Gateway Protocol (BGP) in a VPLS network; and implementing hierarchical VPLS in the VPLS network by using the BGP. The invention further provides a system for implementing hierarchical VPLS.

Abstract: A method and a system for implementing virtual circuit status consistency. A transmitting provider edge router (PE) send an extended network layer reachability information (NLRI) message to a remote PE; the remote PE updates the status of the virtual circuit from the remote PE to the transmitting PE, according to the received extended NLRI message, so as to make the status of the virtual circuits between the transmitting PE and the remote PE consistent. A system for implementing virtual circuit status consistency, the first provider edge router (PE1) in the system sending an extended network layer reachability information (NLRI) message to a second provider edge router (PE2); the PE2 updates the status of the virtual circuit from the PE2 to the PE1 according to the received extended NLRI message, so as to make the status of the bidirectional virtual circuits between the PE1 and the PE2 consistent.

Abstract: A method for accessing VPN using PW Emulation Edge-to-Edge Virtual Leased Line includes: configuring a first PW ID in a first Provider Edge Device that hosts a VSI, and an IP address of a second Provider Edge Device that hosts a PW Emulation Edge-to-Edge Virtual Leased Line associated with the PW ID; sending a second PW ID of the second Provider Edge Device to the first Provider Edge Device; determining whether the second PW ID of the second Provider Edge Device matches the first PW ID of the first Provider Edge Device, and, if it matches, setting the state of the PW between the first Provider Edge Device and the second Provider Edge Device; delivering a Forwarding Table by the first Provider Edge Device; and establishing a bi-directional connection between the by the PW Emulation Edge-to-Edge Virtual Leased Line and the VSI. A Virtual Private System, a first Provider Edge Device, and a second Provider Edge Device are also provided.

Abstract: A method and a system for implementing virtual circuit status consistency. A transmitting provider edge router (PE) send an extended network layer reachability information (NLRI) message to a remote PE; the remote PE updates the status of the virtual circuit from the remote PE to the transmitting PE, according to the received extended NLRI message, so as to make the status of the virtual circuits between the transmitting PE and the remote PE consistent. A system for implementing virtual circuit status consistency, the first provider edge router (PE1) in the system sending an extended network layer reachability information (NLRI) message to a second provider edge router (PE2); the PE2 updates the status of the virtual circuit from the PE2 to the PE1 according to the received extended NLRI message, so as to make the status of the bidirectional virtual circuits between the PE1 and the PE2 consistent.

Abstract: A method for implementing hierarchical Virtual Private LAN Service (VPLS), includes: using Border Gateway Protocol (BGP) in a VPLS network; and implementing hierarchical VPLS in the VPLS network by using the BGP. The invention further provides a system for implementing hierarchical VPLS.

Abstract: A communication method for interworking of local heterogeneous link protocols, includes the following steps: when the type of an input interface of a data packet is a predefined type, remove link layer information of the data packet according to a link protocol of the input interface; transmit the data packet to an output interface; a Provider Edge (PE) encapsulates the data packet according to a link protocol of the output interface and transmits the encapsulated data packet through the output interface. The present invention also discloses a communication apparatus for interworking of local heterogeneous link protocols, including: an input interface, an output interface and a data processor. The present invention processes data packets from specific interfaces and directly transmits the data packets to output interfaces, thereby implementing the interworking of local heterogeneous link layer protocols and smooth upgrading of networks.

Abstract: The present invention discloses a method based on Border Gateway Protocol message for controlling message security protection, the method comprises the communicating process of the authentication mechanism and the authentication word between the message sending side and the message receiving side.

Abstract: The present invention discloses a method based on Border Gateway Protocol message for controlling message security protection, the method comprises the communicating process of the authentication mechanism and the authentication word between the message sending side and the message receiving side.