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Router and communication system

A communication system and router technology, applied in the field of communication systems, can solve problems such as redundant paths, and achieve the effect of preventing redundant paths, inconsistency and address duplication.

Inactive Publication Date: 2007-06-13
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to connect to the Internet through the CE router connected by VPN, the path is lengthy, and it is required to prevent such lengthy path

Method used

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  • Router and communication system
  • Router and communication system
  • Router and communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Figure 2 shows a communication system embodying the invention. The communication system includes CE router A101, CE router B102, LAN A203 to which CE router A belongs, LAN B204 to which CE router B belongs, carrier network 205, ISP A network 206, ISP B network 207, Internet 208, LAN Terminals A-1 104, A-2 103, and A-3 105 connected to A, terminals B-1 107, B-2 106, and B-3 108 connected to LAN B, and server C109 connected to the Internet. CE routers A, B (101, 102), carrier network 205, ISP networks A, B (206, 207), and Internet 208 are connected by using the Internet protocol.

[0025] Figure 3-1 shows a configuration example of a CE router. The CE router A101 is composed of a CPU (Central Processing Unit) 301 , a memory 302 , and interface units 304 and 305 . CPU301 actually executes various application programs and OS (Operating System). The memory 302 stores programs used for execution by the CPU 301 and various application programs. CPU 301 and memory 302 are c...

Embodiment 2

[0065] In Embodiment 2, an example in which the representative CE router prompts and controls the establishment of the connection will be described. FIG. 11 shows the procedure in which CE router A (representative) 101 prompts counterpart CE router B 102 to establish a control connection. The communication system implementing the invention and the setting conditions of various tables are the same as those in the first embodiment.

[0066] Figure 8-2 shows the flow of the connection control establishment process 312 on behalf of the CE router. Figure 9-2 shows the flow of the control connection establishment process other than the representative CE router.

[0067] The CE router A101 creates an AVP to notify the other CE router of the establishment of the control connection (step 814). In addition to the normal AVP at the time of controlling connection establishment, a router type AVP is created. Assign the created AVP to the SCCRQ message, and send the SCCRQ to CE router B ...

Embodiment 3

[0072] In Embodiment 3, a VPN is established between CE routers A101 and B102, and only CE router B102 is connected to the ISP. The terminal A-1 104 in LAN A 203 can communicate with the terminal B-1 107 in LAN B, and an example of cutting off the communication between the terminal A-1 104 and the server C 109 will be described. In addition, communication is possible from the terminal B-1 107 to the server C109.

[0073] Figure 12 shows a communication system embodying the present invention. The communication system includes: CE routers A101, B102, LAN A203 to which CE router A belongs, LAN B204 to which CE router B belongs, carrier network 205, ISP B207, Internet 208, terminal A-1 104 to which LAN A belongs, and LAN B to which LAN B belongs The terminal B-1 107 of , and the server C109 to which the Internet belongs. CE routers A101, B102, carrier network 205, ISP B network 207, and Internet 208 are connected by Internet protocol.

[0074] CE routers A101 and B102 perform t...

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PUM

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Abstract

The invention provides a router and communication system. When points are connected by a L2VPN, it is necessary to unify the address system (network). When the user sets the address manually, address duplication may occur or the network may not be unified due to a setting mistake. In addition, when points are connected by a L2VPN, the VPN internet connection is redundant, and therefore must be prevented. The delegate CE router from among the CE routers that make up the VPN determines the address that is distributed by the other CE routers on the LAN. The determined address is included in the control message for establishing the VPN and the address is then distributed to the other CE routers. Also, the control message for establishing the VPN includes the interface MAC address that is used by the CE routers on the LAN. Each CE router controls the channel according to the MAC address of the next-hop router.

Description

technical field [0001] The present invention relates to a communication system which forms a logically closed network (VPN) between physically separated sites using the Internet protocol. Background technique [0002] Ether IP (RFC3378), L2TPv3 (RFC3931), and the like have been standardized by the IETF as methods for constructing L2VPNs using the Internet Protocol (IP). In Ether IP, the VPN device captures the Ethernet frame flowing on the connected LAN, packs it with the Ether IP header and IP header, and sends it to the VPN device of the other party. The VPN device that received the IP packet that encapsulated the Ethernet frame with the EtherIP header and IP header extracts the Ethernet frame from the received IP packet, and sends the Ethernet frame to the LAN connected to the VPN device that received the IP packet, thereby constructing L2VPN. In L2TPv3, two logical communication paths (control channel and data channel) are defined. In the control channel, a control co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/46H04L29/06H04L12/70
CPCH04L29/12028H04L61/103H04L45/54
Inventor 山田真理子中村雅英
Owner HITACHI LTD
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