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Packet transfer method and transfer apparatus

A packet transmission and network device technology, applied in transmission systems, digital transmission systems, data exchange through path configuration, etc. question

Active Publication Date: 2009-08-19
NIPPON TELEGRAPH & TELEPHONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the above-mentioned existing STP or EAPS switching time is greater than or equal to one second, so there is a problem that high reliability that does not allow packet (frame) loss can not be realized.
In addition, these technologies are port-based failure recovery technologies of the switch, and cannot realize switchover in units of packets.
Also, EAPS or RPR have issues that only apply to ring networks
[0012] In addition, the non-interruption technology of ATM cells described in Patent Document 1 is dedicated to ATM lines, and since it is a non-interruption technology in units of lines, there is a problem that it is not applicable to node failures

Method used

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  • Packet transfer method and transfer apparatus

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Experimental program
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no. 1 approach

[0221] Figure 8 It is a figure showing the structure of the packet transfer apparatus 100 which implements the 1st Embodiment of this invention.

[0222] The packet transfer device 100 shown in the figure has a transmission function unit 110 and a reception function unit 120 . When the packet transfer device 100 is on the sending side, the sending function unit 110 is used, and when the packet transfer device 100 is on the receiving side, the receiving function unit 120 is used.

[0223] The sending function part 110 has: a receiving part 111; a copying part 112; an identifier giving part 113 1 、113 2 ; sending part 114 1 、114 2 .

[0224] The sending function unit 110 receives the packet from the user network side through the receiving unit 111 , and generates two copies of the packet through the copying unit 112 . The copied packets are respectively sent to the identifier assigning unit 113 1 、113 2 , here, the packet is given a counter area (sequence identifier are...

no. 2 approach

[0249] In this embodiment, the device structure uses the first embodiment Figure 8 or Figure 13 structure shown. Among them, in the first embodiment, in the memory A122 A and memory B122 B FIFO or cyclic FIFO are used in , while cyclic hashing is used in this embodiment.

[0250] Figure 14 It is a diagram for explaining the case where circular hash is used in the memory according to the second embodiment of the present invention.

[0251] In circular hashing, a given memory area is divided into n (integer) parts, and 1 to n are given as addresses. A packet sent from the wide area network refers to the counter value and is stored in a memory area whose address is the remainder of dividing the counter value by n. In addition, when saving, if the payload area is included in the L2 header, path identifier area, counter area, and data (payload) area, you can save all of them, or select some of them save. For the memory A122 configured in this way A and memory B122 B co...

no. 3 approach

[0262] Figure 16 is a diagram showing the configuration of a packet transfer device according to a third embodiment of the present invention.

[0263] The packet transfer device 200 shown in the figure is composed of a transmission function unit 210 and a reception function unit 220 .

[0264] The sending function part 210 has: a receiving part 211; a copying part 212; an encoding part 213 1 、213 2 ; sending part 214 1 、214 2 , is the same as the first embodiment of the Figure 8 The same structure is shown.

[0265] The receiving function unit 220 has: a receiving unit 221 1 、221 2 ;memory A222 A , Memory B222 B ; selection section 223 1 、223 2 ; The counter unit 224 ; The sending unit 225 . The receiving function part 220 through the receiving part 221 1 、221 2 Receive packet and write to memory A222 A or memory B222 B . In addition, memory A222 A , Memory B222 B Applied as FIFO.

[0266] Option Section 223 1 、223 2 From memory A222 A , Memory B222 B...

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Abstract

There is disclosed a packet transmission method in a network device for transmitting a packet. In the packet transmission method, a device of the transmission side creates two copies from the transmission packet, adds a sequence number for identifying the same transmission order to each of the copied packets, adds an identifier corresponding to the transmission / reception pair to each of the copied packets, and transmits them. A device of the reception side receives the packets by two reception means, respectively and recognizes the identifier corresponding to the transmission / reception pair. If the identifiers coincide, the packet having the same information and its order are identified from the sequence number and one of the packets having the same order is selected and transmitted downstream while the other packet is discarded. When only one has arrived, the packet which has arrived is transmitted downstream.

Description

technical field [0001] The present invention relates to a packet transmission method and a packet transmission device, in particular to encapsulation and transmission modes of variable-length packets such as Ethernet (Ethernet) transmission mode, MPLS transmission mode, GRE encapsulation, IPinIP encapsulation, GFP encapsulation, and second-layer frame encapsulation. A packet transmission method and a packet transmission device for realizing failure recovery without packet loss in a network such as the invention. Background technique [0002] Existing failure detection / switching technologies in packet communication include: for example, STP (Spanning Tree Protocol) in Ethernet and its derivative technologies (for example, refer to non-patent documents 1-3), or EAPS (Ethernet Automatic Protection Switching: Ethernet automatic protection switching). In addition, EAPS includes technology for high-speed switching through a ring topology oriented to MAN services. [0003] This t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L1/22H04L12/46H04L12/701
Inventor 社家一平福德光师今宿互岛野胜弘
Owner NIPPON TELEGRAPH & TELEPHONE CORP
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