WO2004064341A1 - Procede d'execution d'un transfert sans interruption pendant une panne de ligne dans un reseau ip - Google Patents

Procede d'execution d'un transfert sans interruption pendant une panne de ligne dans un reseau ip Download PDF

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Publication number
WO2004064341A1
WO2004064341A1 PCT/JP2003/000186 JP0300186W WO2004064341A1 WO 2004064341 A1 WO2004064341 A1 WO 2004064341A1 JP 0300186 W JP0300186 W JP 0300186W WO 2004064341 A1 WO2004064341 A1 WO 2004064341A1
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WO
WIPO (PCT)
Prior art keywords
packet
packets
transmission
line
transmitted
Prior art date
Application number
PCT/JP2003/000186
Other languages
English (en)
Japanese (ja)
Inventor
Yoshihide Komatsu
Hirofumi Yagawa
Kazuya Ryu
Kazuaki Yoshida
Toshinobu Tsunematsu
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2003/000186 priority Critical patent/WO2004064341A1/fr
Priority to JP2004566261A priority patent/JPWO2004064341A1/ja
Publication of WO2004064341A1 publication Critical patent/WO2004064341A1/fr
Priority to US11/122,381 priority patent/US20050201375A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L12/5602—Bandwidth control in ATM Networks, e.g. leaky bucket
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation
    • H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
    • H04L1/243—Testing correct operation by comparing a transmitted test signal with a locally generated replica at the transmitter, using a loop-back
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection

Definitions

  • the present invention relates to an uninterruptible transfer method in the event of a line failure in an IP network, which prevents a bucket loss at the moment when a failure occurs due to a line disconnection, etc., between devices accommodating a plurality of IP packet lines.
  • FIG. 1 is a diagram illustrating a conventional example of packet transfer in a network.
  • Fig. 1 if a disconnection fault occurs at point A-a during this download, the data is invalid because the download is not completed (packet loss). In such a case, when the user notices this and requests retransmission, route B through network R1, R2, R4, and R3 of network 3 is established, and the download from server 1 is executed again. Is done.
  • an object of the present invention is to prevent a packet loss in the event of a line failure, rescue the lost packet at the moment of the failure by resending it, and use the line transmission / reception terminal (END-END for packet communication). It is an object of the present invention to provide a hitless transfer method for preventing the influence of a failure and a packet transmission device to which the method is applied.
  • the method of instantaneous interruption transfer in the event of a line failure in an IP network is intended for use in a transmission system that performs bucket transmission between transmission devices connected by a plurality of lines.
  • the first aspect of the non-instantaneous transfer method according to the first aspect is that a test packet including information on the number of packets received from the transmission apparatus at the transmission destination is periodically transmitted to the transmission apparatus at the transmission source, and the transmission apparatus at the transmission source is transmitted.
  • a bucket transmitted to the transmission device at the transmission destination is stored in a buffer memory before transmission.
  • a packet stored in the buffer memory corresponding to the match is released from the buffer memory.
  • a third mode of the hitless transfer method according to the present invention that achieves the above object of the present invention is the second aspect, wherein in the second mode, one user packet transmitted to the transmission apparatus at the transmission destination is classified into a plurality of quality classes. O Classifying and storing only user packets of a predetermined quality class or higher in the buffer memory.
  • the first aspect is characterized in that, in the first aspect, a packet retransmitted by a line different from the one line is connected to a maximum length of transmittable and formed into one packet, and then retransmitted. .
  • a fifth aspect of the hitless transfer method according to the present invention for achieving the object of the present invention is the first aspect, wherein in the first aspect, when retransmitting a packet through a line different from the one line, the It is characterized in that a transfer band and a transfer band of a packet transmitted by the different line are set equally.
  • FIG. 1 is a diagram for explaining a conventional example of packet transfer in a network.
  • FIG. 2 is a diagram for explaining a conceptual configuration of a method of instantaneous interruption transfer at the time of a line failure according to the present invention in an IP network corresponding to FIG.
  • FIG. 3 is a diagram for explaining the flow of a packet between the devices R1 and R2 corresponding to the operation shown in FIG.
  • FIG. 4 is a diagram for explaining the operation of the conventional packet buffer 100.
  • FIG. 5 is a diagram for explaining the operation of the packet buffer 100 according to the present invention.
  • FIG. 6 is a diagram illustrating a mechanism for detecting a line failure in the present invention.
  • FIG. 7 is a diagram illustrating a mechanism for suppressing an increase in traffic by increasing the “test packet transmission cycle”.
  • FIG. 8 is a diagram for explaining an embodiment for solving the problem of a large number of packets to be transmitted at the time of packet retransmission.
  • FIG. 9 is a diagram for explaining the processing of the connection control unit 122.
  • FIG. 3 is a diagram for explaining an embodiment for preventing occurrence of indiscriminate packet discarding.
  • FIG. 2 is a diagram for explaining a conceptual configuration of a method of instantaneous interruption transfer at the time of a line failure according to the present invention in an IP network corresponding to FIG.
  • FIG. 3 is a diagram illustrating a flow of a packet between the device R1 and the device R2 corresponding to the router in FIG.
  • the device R 1 and the device R 2 corresponding to the router and the buffer memory 100, respectively, and a plurality of line interface circuit 200 A 1, A 2-200 B 1, ⁇ Has two.
  • a user packet which is a packet having overnight information, flows on the physical link, and a test packet carrying information on the number of received packets at each port is periodically transmitted.
  • the test packet has information on the number of packets received by each device between the header a and the check code (FCS) b of the MAC / IP address.
  • FCS check code
  • the information on the number of received packets includes the information on the number of received packets c 1 and c 2 in the two interface circuits 200 A 1 and 200 A 2 of the device R 1.
  • the two physical links 200 B1 to 200 A1 and 200 B2 to 200 A2 from the device R2 to the device R1 are used as information on the number of received packets.
  • R2 has information d1 and d2 on the number of received packets in the two interface circuits 200B1 and 200B2.
  • the receiver connected to the interface circuit 200 B 1 on the device R 2 is connected to the interface circuit 200 A 1 on the device R 1 Receives test packets sent periodically from the transmitter. As a result, it is confirmed that the physical link from the interface circuit 200A1 to 200B1 is normal.
  • test packet between ports B2 and A2 includes the number of received packets of ports A1 and B1, and the test packet between ports B1 and A1 includes port A2. , B2, the number of received packets.
  • the test packet from port B1 to port A1 has no information on the number of received packets at port B1, so the user packet on buffer memory 100 of device R1 is cleared. It is kept without being. After a failure occurs, the user packets held in the buffer memory 100 of the device R1 are cleared by the number of received packets at the port B1 mounted on the test packet in the direction from the port B2 to the port A2, and the remaining packets are cleared. Uses the normal physical link from port A 2 to port B 2 to perform retransmission by detouring. Therefore, double transmission is suppressed.
  • the conventional method always causes a packet loss, and then requires retransmission processing between the sending and receiving terminals (END-END). And other inconveniences.
  • the above-described inconvenience does not occur because packet loss is prevented between devices when a line failure occurs.
  • the relationship between the “test packet transmission cycle” and the “transmission packet retransmission buffer capacity” is important.
  • test bucket transmission cycle If the “test bucket transmission cycle” is short, the traffic of the test bucket itself increases and the line utilization efficiency deteriorates. Conversely, if the transmission cycle is long, it takes time to detect a line failure, so the required capacity of the retransmission buffer increases, and there is a difficulty in increasing the equipment cost and increasing the size.
  • the bandwidth guarantee class of the switching source traffic guarantees the guaranteed bandwidth before the occurrence even after a line failure occurs, and the lowest bandwidth guarantee class of the switching source traffic that was used immediately before the line failure occurred To the guaranteed minimum bandwidth.
  • non-guaranteed classes of the switching source traffic are discarded with priority.
  • the bandwidth guarantee class of the traffic at the switching destination must guarantee the guaranteed bandwidth before the occurrence even after a line failure occurs.
  • the non-guaranteed class is preferentially discarded.
  • the minimum bandwidth guaranteed class suppresses the bandwidth used immediately before a line failure occurs to the minimum bandwidth guaranteed value, and discards the non-guaranteed class with priority.
  • FIG. 4 is a diagram for explaining the operation of the conventional packet buffer 100.
  • the packet PK input to the source transmission device R1 is temporarily stored in a buffer memory 100, and when a packet is transmitted, a buffer area for packet information transmitted from the port is set. Open.
  • the packet information sent from port 2 is deleted from the corresponding area.
  • FIG. 5 is a diagram for explaining the operation of the packet buffer 100 according to the present invention.
  • the packet input to the source transmission device R1 is temporarily stored in the buffer memory 100. Then, as described with reference to FIG. 3, the source transmission device R1 receives the number-of-received-packets information from the transmission destination, and after confirming that the reception has been normally performed, releases the buffer area of the corresponding packet information. I do.
  • FIG. 6 is a diagram illustrating a mechanism for detecting a line failure in the present invention. You. Although FIG. 6 shows only the interface portion of the one-sided device R1, the same applies to the opposing device R2. For convenience, the device R1 will be referred to as a transmission source device, and the device R2 will be referred to as a transmission destination device, with reference to the one-way packet transmission direction. The same applies to the following embodiments.
  • a test bucket is mutually transmitted between the source transmission device R1 and the destination transmission device R2 at a constant cycle.
  • the test packet sent from the source transmission device R1 to the destination transmission device R2 includes the number of packets per user received by the source transmission device R1 [PORT 1 is Al, Port (PORT) 1 is equipped with A2]. Conversely, the test packet sent from the destination transmission device R2 to the source transmission device R1 includes the number of packets per user received by the destination transmission device R2 [Port (PORT) 1 is Bl, Port (PORT) 1 is equipped with B 2].
  • test bucket The format of such a test bucket is header as shown.
  • each of the ports 1 and 2 in the interface section extracts a test packet generated by the test packet generator 201 that generates the test packet and a test packet transmitted from the transmission destination transmission device R2. And a test bucket extracting unit 202. Further, it has a transmission-side buffer memory (hereinafter simply referred to as a buffer) 100-1, a reception-side buffer memory (hereinafter simply referred to as a buffer) 100-2, a multiplexer 101, and a demultiplexer 102.
  • a transmission-side buffer memory hereinafter simply referred to as a buffer
  • a reception-side buffer memory hereinafter simply referred to as a buffer
  • a demultiplexer 102 a demultiplexer
  • the test packet generation unit 201 is read from the transmission buffer 100-1 of the transmission source device R1 during a period from transmitting the test packet to transmitting the next test packet.
  • the count of the number of packets transmitted per user [the number of packets C1 transmitted from port (PORT) 1 and the number of packets C2 transmitted from port (PORT) 2] is counted and monitored. This meter The number monitoring result is notified to the test packet extracting unit 202.
  • the test packet extraction unit 202 knows the number of packets to be received by the destination transmission device R 2 (the transmission packet counted in the count of the test packet generation unit 201).
  • the numbers C 1 and C 2 are notified to the test packet extraction unit 202).
  • the number of received packets (B1 for port 1 and B2 for port 2) mounted on the test packet sent from the destination transmission device R2 and the number of received packets from the source transmission device R1 to the destination transmission device R2
  • the number of the transmitted packets (port 1 compares C1 and port 2 compares C2. In this comparison, if they do not match, it is possible to detect a line failure.
  • the number of received packets (B 1) of port 1 of destination transmission device R 2 mounted on a test packet received by source transmission device R 1 from destination transmission device R 2 is equal to that of source transmission device R 2. If the number of packets (C 1) previously transmitted from port 1 of port 1 to port 1 of destination transmission apparatus R 2 is the same, port 1 of destination transmission apparatus R 2 normally operates It can be recognized that packet transmission / reception has been performed. ⁇ '
  • the number of received packets (B 1) of port 1 of destination transmission device R 2 mounted on the test packet received by source transmission device R 1 is equal to port 1 of source transmission device R 1.
  • port 1 of source transmission device R 1 and destination transmission device R 2 Recognize as a line failure between ports 1.
  • the information of the corresponding packet stored in the buffer 100-1 is read out (120) and retransmitted by another line connected to the port 2 of the transmission source device R1.
  • the number of lost buckets is calculated.
  • the calculation of the number of lost packets is based on the number of packets (C 1) transmitted from the source transmission device R 1 to the destination transmission device R 2 counted by the test packet generation unit 201 and the destination transmission device It is determined by the difference between the number of buckets to be received by R2.
  • the test packet notifies that the number of received packets is (B1) from the destination transmission device R2. Then, the number of lost buckets is (C 1 _ B 1).
  • the number of received packets (B 1) means that packet communication was normally performed, and corresponds to the number of relevant packets (B 1) held in buffer 100-1. Release the packet.
  • the information for the corresponding number of packets (C1 ⁇ B1) held in the buffer .100-1— is stored in port 2 It is retransmitted by another line connected to. As a result, it is possible to prevent packet loss due to line failure.
  • the relationship between “the test packet transmission cycle” and “the transmission packet retransmission buffer capacity” is important.
  • test bucket transmission cycle If the “test bucket transmission cycle” is short, the traffic of the test bucket itself increases and the line utilization efficiency deteriorates. On the other hand, if the transmission cycle is long, it takes time to detect a line failure, so the required capacity of the retransmission buffer increases, which leads to an increase in equipment cost and an increase in size.
  • the packet type input to the interface unit is Q1 # H (bandwidth guarantee class of port 1 of source transmission device R1), Q1 # M (minimum bandwidth of port 1 of source transmission device R1). Guaranteed class) and Q1 # L (non-guaranteed class for port 1 of source transmission device R1).
  • a QoS filter 110 is provided in front of the “1” You. With this filter 110, guarantee is allocated in the event of a line failure according to the above bucket type.
  • the relationship of the following formula is set in advance so that the distribution ratio is equal to or less than the buffer capacity occupied by the non-guaranteed class Q1 # L. deep.
  • the packet is read from the buffer 100-1, and the transmission source transmission device R After sending from 1, buffer 1 0 0—1 is released.
  • test packet extraction unit 202 normally receives data at the transmission destination transmission device R2 as described above with reference to FIG. Releases buffer 100-1 when notified of the changed packet information—:
  • test packet extraction unit 202 receives the notification of the loss packet information due to the line failure, the packet information is held in the buffer 100-1, and the other line [Port (P0RT) 2] Switch to and send. As a result, it is possible to prevent an increase in the capacity of the router and to supplement a loss packet caused by a failure of the port 1 line.
  • FIG. 8 shows an embodiment corresponding to such a situation, which is characterized in that a connection control unit 121 is provided.
  • short packets are combined (composite) up to the maximum transmittable bucket length (MTU) size in order to transmit a large number of packets in a short time.
  • MTU maximum transmittable bucket length
  • the packet structure to be transmitted consists of a header and a chain for each packet. Qubit FCS etc. are attached.
  • a plurality of short packets for example, packets A, B, C, D, and E can be transmitted at the maximum packet length size, for example, 1522 bytes.
  • the maximum packet length size for example, 1522 bytes.
  • the packet F thus combined (composite)
  • a large amount of packets can be retransmitted in a short time, and retransmission can be performed without packet loss in the event of a line failure.
  • the buffer 100 which holds the difference between the number of transmitted packets and the number of received packets, is connected to port 2 to complement the packet lost due to the line failure.
  • the load may temporarily increase suddenly on the other line at the switching destination.
  • FIG. 1 An embodiment for preventing such inconvenience is shown in FIG. 1
  • the embodiment shown in FIG. 10 has a bandwidth guaranteeing unit 130 having a priority processing unit 1331 and a round robin unit 132 in order to deal with such inconvenience.
  • the packets input from the buffer 1 0 0—1 of port 1 as the transmission source to the priority processing unit 1 3 1—1 are the bandwidth guarantee class (Q1 # H) and the minimum bandwidth guarantee class (Q1 # M). ), Non-guaranteed class (Q1 # L).
  • Packets input from the buffer 1 0 0-1 on the port 2 side to be switched to the priority processing unit 131-2 are also bandwidth guaranteed class (Q2 # H), minimum bandwidth guaranteed class (Q2 # M), Non-guaranteed class (Q2 # L).
  • the priority processing units 131-1 and 131-2 are the bandwidth guarantee class (Q1 # H for port 1 and Q2 # H for port 2) and the minimum bandwidth guarantee class (Q1 # H for port 1).
  • #M, port 2 Q2 # M) packet is sent preferentially, and if there is no bandwidth guarantee class or minimum bandwidth guarantee class packet, a non-guaranteed class outside the minimum bandwidth guarantee (Q1 #L, Q2 # L at port 2) Do.
  • the packets processed by the priority processing sections 131-1-1 and 131-2 pass through the round robin (WRR) section 132 and are transmitted as they are.
  • WRR round robin
  • the ratio of packets sent to each port can be changed by the round robin (WRR) unit 132.
  • the round robin (WRR) unit 132 sets, for example, the maximum physical line speed from port 1 and port 2 to 1 Gbit / sec. Normally, 100% packet transmission settings are made for Port 1 and Port 2 respectively.
  • the bandwidth ratio is set equally in the round robin section 132 as described above, the retransmission packet from port 1 and the original bandwidth guarantee packet from port 2 are sent to the line without discarding. It is possible. As described above, the quality of ports 1 and 2 is guaranteed without loss of the bandwidth guarantee class packet of the retransmission port 1 and the bandwidth guarantee class packet of the switching destination port 2, and if there is a line failure. It is possible to supplement the bucket of port 1 that has been lost once. Industrial potential
  • an increase in the buffer capacity required for the retransmission processing is suppressed, and an increase in traffic generated in the retransmission processing can be suppressed. Furthermore, it is possible to mitigate the sudden increase in traffic that occurs in the retransmission processing.
  • This provides an instantaneous uninterrupted transfer method in the event of a line failure in an IP network that eliminates inconveniences such as delays and data corruption in the event of a line failure. Is provided.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Un transfert sans interruption peut être exécuté pendant une panne de ligne dans un système de transmission exécutant une transmission de paquets entre des appareils de transmission connectés via une pluralité de lignes. Dans un procédé d'exécution du transfert sans interruption, des paquets de test contenant des informations sur le nombre de paquets reçus par l'appareil de transmission d'une destination sont envoyées périodiquement à l'appareil de transmission d'une source. L'appareil de transmission de la source compare les informations reçues du nombre de paquets contenus dans les paquets de test reçus au nombre de paquets envoyés à l'appareil de transmission de la destination par une ligne. Lorsque la comparaison fait apparaître un désaccord entre le nombre de paquets reçus et le nombre de paquets envoyés, les paquets correspondant au désaccord sont renvoyés à l'appareil de transmission de la destination par une autre ligne. Les paquets, avant d'être envoyés vers l'appareil de transmission de la destination, sont stockés dans une mémoire tampon. Lorsque la comparaison fait apparaître un désaccord entre le nombre de paquets reçus et le nombre de paquets envoyés, les paquets, lesquels sont stockés dans la mémoire tampon, correspondant à l'accord sont libérés de la mémoire tampon.
PCT/JP2003/000186 2003-01-14 2003-01-14 Procede d'execution d'un transfert sans interruption pendant une panne de ligne dans un reseau ip WO2004064341A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP2003/000186 WO2004064341A1 (fr) 2003-01-14 2003-01-14 Procede d'execution d'un transfert sans interruption pendant une panne de ligne dans un reseau ip
JP2004566261A JPWO2004064341A1 (ja) 2003-01-14 2003-01-14 Ｉｐネットワークにおける回線故障時の無瞬断転送方法
US11/122,381 US20050201375A1 (en) 2003-01-14 2005-05-05 Uninterrupted transfer method in IP network in the event of line failure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2003/000186 WO2004064341A1 (fr) 2003-01-14 2003-01-14 Procede d'execution d'un transfert sans interruption pendant une panne de ligne dans un reseau ip

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US11/122,381 Continuation US20050201375A1 (en) 2003-01-14 2005-05-05 Uninterrupted transfer method in IP network in the event of line failure

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007134976A (ja) * 2005-11-10 2007-05-31 Matsushita Electric Ind Co Ltd 通信装置及び通信方法
JP2010154060A (ja) * 2008-12-24 2010-07-08 Sumitomo Electric Ind Ltd 通信装置
JP2012257067A (ja) * 2011-06-09 2012-12-27 Hitachi Ltd ネットワーク装置およびネットワーク装置の制御方法
US8537819B2 (en) 2005-11-10 2013-09-17 Panasonic Corporation Power line communication apparatus, power line communication method and communication apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61237545A (ja) * 1985-04-12 1986-10-22 Fujitsu Ltd デ−タ伝送方式
JPH0897858A (ja) * 1994-09-26 1996-04-12 Nec Eng Ltd データ転送方式
EP1249976A2 (fr) * 2001-03-06 2002-10-16 NTT DoCoMo, Inc. Procédé et dispositif de transmission de paquets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61237545A (ja) * 1985-04-12 1986-10-22 Fujitsu Ltd デ−タ伝送方式
JPH0897858A (ja) * 1994-09-26 1996-04-12 Nec Eng Ltd データ転送方式
EP1249976A2 (fr) * 2001-03-06 2002-10-16 NTT DoCoMo, Inc. Procédé et dispositif de transmission de paquets

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007134976A (ja) * 2005-11-10 2007-05-31 Matsushita Electric Ind Co Ltd 通信装置及び通信方法
US8537819B2 (en) 2005-11-10 2013-09-17 Panasonic Corporation Power line communication apparatus, power line communication method and communication apparatus
JP2010154060A (ja) * 2008-12-24 2010-07-08 Sumitomo Electric Ind Ltd 通信装置
JP2012257067A (ja) * 2011-06-09 2012-12-27 Hitachi Ltd ネットワーク装置およびネットワーク装置の制御方法

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