Virtual network construction method, system, and relaying apparatus
First Claim
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1. A virtual private network (VPN) construction system for a public data communication network comprising:
- first relaying apparatuses, with one or more virtual routers each of which is associated with a VPN-ID and a multicast address in a table, generating and multicasting control packets each of which contains a source address of each virtual router and is transmitted for the multicast address as a destination address corresponding to the VPN-ID of each virtual router, andsecond relaying apparatuses, with one or more virtual routers each of which is associated with a VPN-ID and a multicast address in a table, accepting only the control packets of the multicast address corresponding to the VPN-ID of each virtual router of the second relaying apparatuses, establishing virtual links using the source address in the control packets with the first relaying apparatuses and returning reply packets to the first relaying apparatuses through the virtual links,whereby the virtual private network is constructed between the virtual routers that are specific to a same multicast address in the first and the second relaying apparatuses, with the virtual links established between all pairs of the virtual routers and with virtual interfaces receiving packets from outside the public data communication network.
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Abstract
In a virtual network construction method, a virtual network construction system, and a relaying apparatus within a public data communication network, control packets each having set a multicast address are multicast, and upon reception of the control packets by the relaying apparatuses belonging to the multicast address group, virtual links to the transmitting sources of the control packets are established and reply packets are returned through the virtual links, whereby the virtual links are established between all of the relaying apparatuses belonging to the multicast address group to establish the virtual network.
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9 Claims
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1. A virtual private network (VPN) construction system for a public data communication network comprising:
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first relaying apparatuses, with one or more virtual routers each of which is associated with a VPN-ID and a multicast address in a table, generating and multicasting control packets each of which contains a source address of each virtual router and is transmitted for the multicast address as a destination address corresponding to the VPN-ID of each virtual router, and second relaying apparatuses, with one or more virtual routers each of which is associated with a VPN-ID and a multicast address in a table, accepting only the control packets of the multicast address corresponding to the VPN-ID of each virtual router of the second relaying apparatuses, establishing virtual links using the source address in the control packets with the first relaying apparatuses and returning reply packets to the first relaying apparatuses through the virtual links, whereby the virtual private network is constructed between the virtual routers that are specific to a same multicast address in the first and the second relaying apparatuses, with the virtual links established between all pairs of the virtual routers and with virtual interfaces receiving packets from outside the public data communication network. - View Dependent Claims (2, 3, 4)
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5. A relaying apparatus, which terminates virtual private networks (VPNs) within a public data communication network comprising:
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virtual routers each of which is associated with a VPN-ID and a multicast address in a table, a packet unit generating and multicasting control packets each of which contains a source address of each virtual router and is transmitted for the multicast address as a destination address corresponding to the VPN-ID of each virtual router, and a link unit accepting only the control packets of the multicast address corresponding to the VPN-ID of each virtual router of one or more other relaying apparatuses establishing virtual links using the source address in the control packets with the one or more other relaying apparatuses which are transmitting sources of the control packets and returning reply packets to the one or more other relaying apparatuses through the virtual links, whereby the virtual private network is constructed between the virtual routers that are specific to a same multicast address, with the virtual links established between all pairs of the virtual routers, and with virtual interfaces receiving packets from outside the public data communication network. - View Dependent Claims (6, 7, 8, 9)
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Specification