WO2023181162A1 - Procédé de commutation de dispositif de communication, et système de communication - Google Patents

Procédé de commutation de dispositif de communication, et système de communication Download PDF

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Publication number
WO2023181162A1
WO2023181162A1 PCT/JP2022/013465 JP2022013465W WO2023181162A1 WO 2023181162 A1 WO2023181162 A1 WO 2023181162A1 JP 2022013465 W JP2022013465 W JP 2022013465W WO 2023181162 A1 WO2023181162 A1 WO 2023181162A1
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WO
WIPO (PCT)
Prior art keywords
relay
communication
frame
llid
home
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Application number
PCT/JP2022/013465
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English (en)
Japanese (ja)
Inventor
昂平 鈴木
勝也 南
康隆 木村
一成 間瀬
Original Assignee
日本電信電話株式会社
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Application filed by 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to PCT/JP2022/013465 priority Critical patent/WO2023181162A1/fr
Publication of WO2023181162A1 publication Critical patent/WO2023181162A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/44—Star or tree networks

Definitions

  • the present disclosure relates to a communication device switching method for switching a communication device from one to another, and a communication system that can implement the method.
  • Patent Document 1 discloses a method of performing this switching work without interrupting communication (without interruption).
  • FIG. 1 is a diagram illustrating a communication device switching method disclosed in Patent Document 1.
  • an uninterrupted communication device 10 is used to connect a device (internal MC) 15#1 in a source building to a device (internal MC) 15#2 in a destination building.
  • a method for switching to is disclosed.
  • the uninterrupted communication device 10 is a device that performs frame order management using sequence numbers, frame duplication confirmation, frame duplication, frame selection control, and correction control for path delay and delay fluctuation.
  • Step 1 In-house MC 11 #2, in-office MC 15 #2, switch 16 #2, in-office MC 25 #2, and in-home MC #2 are newly installed in the system.
  • the uninterrupted communication device 10-1 By connecting the uninterrupted communication device 10-1 to two in-home MCs (11#1, 11#2) and the uninterrupted communication device 10-2 to two in-home MCs (21#1, 21#2), communication is performed simultaneously using both route 1 from the home MC 11#1 to the home MC 21#1 and route 2 from the home MC 11#2 to the home MC 21#2.
  • Step 2 From this state, the home MC 11#1 is turned off. Then, the uninterrupted communication device 10-1 continues communication using the home MC 11#2 without frame loss due to its functions.
  • the communication device switching method disclosed in Patent Document 1 prepares two communication paths and uses an uninterrupted communication device to change the path from the source building to the destination building without interruption.
  • the method is to switch.
  • the communication device switching method disclosed in Patent Document 1 requires installation of the in-home MC 11#2 and the non-interruption switching device 10-1 opposite to the in-office MC 15#2 of the relocation destination building Tn1 in the user building U1. Similar redundancy is also required for the communication partner user building U2 and station building T2. For this reason, the communication device switching method disclosed in Patent Document 1 has problems in that the cost of the equipment is high and that there is a period when communication is not possible in the opposite building due to redundancy construction.
  • the communication device switching method is a communication device switching method for changing a relay device connected to a network via a layer 2 switch from one to the other, connecting a termination device to both of the relay devices using LLID and time-sharing communication;
  • both of the relay devices set the previous setting to discard the downlink frame from the other relay device and send the uplink frame to one of the relay devices using the LLID.
  • the two switches transmit downlink frames addressed to the terminal device to the other relay device.
  • the communication system includes two relay devices connected to the network via a layer 2 switch, and a terminal device connected to both relay devices via a splitter using LLID and time-sharing communication.
  • a communication system comprising: The terminal device discards the downlink frame from the other relay device and transmits the uplink frame to one of the relay devices using the LLID at a timing when the terminal device is about to change the relay device with which it communicates from one to the other.
  • the layer 2 switch is characterized in that it automatically learns the route of the uplink frame in the new setting and transmits the downlink frame addressed to the terminal device to the other relay device.
  • Step 1 The terminating device changes the uplink frame to the transfer destination relay device using the LLID, and makes settings to accept the downlink frame from both the transfer destination and transfer source relay devices.
  • Step 2 By using the L2 switch function (automatically learns the source MAC address of an upstream frame and the port that received the frame, and sends a downstream frame with the destination MAC address of the terminal device to that port), the downstream frame is Automatically route through the relay device at the relocation destination.
  • the terminal device In this communication device switching method, during switching, the terminal device enters a state where it accepts downlink frames from both the transfer destination and transfer source relay devices, and broadcast frames arrive in duplicate. Therefore, it is not possible to switch completely without interruption as in Patent Document 1. (supplement) In a state where the terminating device accepts downlink frames from both relay devices, broadcast frames arrive twice, and this is communication not intended by the sender, resulting in a state in which communication is essentially impossible. In the present disclosure, this state in which communication is virtually impossible is treated as a "momentary interruption.”
  • this communication device switching method only requires preparing a transfer destination relay device and an L2 switch and forming a PON configuration (low cost and no redundancy construction required).
  • the switching of this communication device switching method is not instantaneous, the period during which broadcast frames arrive at the terminal device in duplicate is only the learning time of the L2 switch, and the effect on the communication system as a whole is small.
  • a momentary interruption with a small effect is expressed as a "short momentary interruption.”
  • the present invention can provide a communication device switching method and a communication system that can switch communication devices at low cost and without redundancy construction.
  • the communication device switching method is characterized in that, after changing to the new setting, a completion setting is further performed on the terminal device to discard the downlink frame from one of the relay devices. Further, the terminal device of the communication system according to the present invention is characterized in that, after changing to the new setting, the terminal device further performs a completion setting for discarding the downlink frame from one of the relay devices.
  • the present invention can provide a communication device switching method and a communication system that can switch communication devices at low cost and without redundancy construction.
  • FIG. 2 is a diagram illustrating a related communication system.
  • FIG. 1 is a diagram illustrating a communication system according to the present invention.
  • FIG. 2 is a diagram illustrating a communication device switching method according to the present invention.
  • FIG. 2 is a diagram illustrating a communication device switching method according to the present invention.
  • FIG. 1 is a diagram illustrating a communication system according to the present invention.
  • FIG. 2 is a diagram illustrating the communication system of this embodiment.
  • This communication system is two relay devices (35#1, 35#2) connected to the network 50 via layer 2 switches (16#1, 16#2);
  • a terminal device 31 that connects to both relay devices (35#1, 35#2) via a splitter 33 using LLID and time-sharing communication; Equipped with The terminating device 31 discards the downlink frame from the relay device 35#2 at the timing when the communication is to be changed from the relay device 35#1 to the relay device 35#2, and transmits the uplink frame to the relay device 35#1 using the LLID.
  • the "old setting" transmits frames
  • the "new setting” receives downlink frames from both relay devices (35#1, 35#2) and sends uplink frames to relay device 35#2 using the LLID.
  • Change to The layer 2 switches (16#1, 16#2) automatically learn the route of the uplink frame (the source MAC address of the frame and the port that received the frame) in the "new setting” and send it to the terminal device 31.
  • the downlink frame is transmitted to the relay device 35#2.
  • the relay device 35#1 in the source building To1 of the wide area Ethernet service is replaced with the relay device (e.g., in-house MC) in the destination building Tn1.
  • the relay device 35#1 may be referred to as "in-office MC 35 #1”
  • the relay device 35 #2 may be referred to as “in-office MC 35 #2”
  • the terminal device 31 may be referred to as "in-home MC 31.”
  • This communication system includes, on the switching side, an in-house MC 31, an in-office MC 35 #1 and L2 switch 16 #1 in the relocation source building To1, and an in-office MC 35 #2 and L2 switch 16 #2 in the relocation destination building Tn1, and relays.
  • On the other side via the network 50 there is an in-house MC 21, and an in-office MC 25 and an L2 switch 26 in the office building T2.
  • This communication system connects an in-home MC 31 and two in-office MCs (35#1, 35#2) through an optical transmission path including a splitter 33 to form a PON.
  • the in-house MC 31 functions as an OLT (Optical Line Terminal), and the in-house MC (35#1, 35#2) functions as an ONU (Optical NetWork Unit).
  • OLT Optical Line Terminal
  • ONU Optical NetWork Unit
  • the in-home MC 31 and the two in-office MCs (35#1, 35#2) are connected 1:2 using LLID and time-division communication. With this configuration, before device switching, the home MC 31 has established 1:1 communication with the home MC 35 #1, but has not established communication with the home MC 35 #2.
  • the L2 switches (16#1, 16#2) and the switches (rings) of the relay network 50 have the same general and basic functions as before, by referring to the destination MAC address of the received frame and sending it from the appropriate port. It has the ability to send. Furthermore, if the received frame has an unlearned MAC address and port combination, the L2 switches (16#1, 16#2) and the switch (ring) of the relay network 50 change the MAC address and port combination. It has the ability to learn.
  • the communication device switching method in this communication system does not require an uninterrupted communication device, and does not require the other party to add redundant routes (in-office MC 25 in office building T2 and in-home MC 21 in user building U2). , device switching is completed with only the work on the switching side.
  • FIG. 3 is a diagram illustrating a communication device switching method in this communication system.
  • This communication device switching method is a method of changing the relay device connected to the network 50 via layer 2 switches (16#1, 16#2) from one (35#1) to the other (35#2). , connecting the terminal device 31 to both relay devices (35#1, 35#2) using LLID and time-sharing communication (step S01); At any timing, the "previous setting" for discarding the downlink frame from the relay device 35#2 and transmitting the uplink frame to the relay device 35#1 using the LLID is set to the terminal device 31 on both relay devices.
  • Step S02 changing to a "new setting” that receives downlink frames from (35#1, 35#2) and transmits uplink frames to the relay device 35#2 using the LLID, and "new setting"
  • the layer 2 switch 16#2 which has automatically learned the route of the uplink frame at I do.
  • step S03 in order to complete the device switching, “completion setting” is further performed on the terminal device 31 to discard the downlink frame from the relay device 35#1.
  • FIG. 4 is a diagram specifically explaining this communication device switching method. Note that, as described above, in this communication device switching method, device switching is completed only by the work on the switching side, so the description of the other party's devices (in-home MC 21, in-office MC 25, L2 switch 26) is omitted in FIG.
  • Step S01 This is the state shown in FIG. 4(A).
  • a splitter 33 is installed in the middle of the optical transmission path (optical fiber) from the home MC 31 to the office MC 35 #1. If a splitter is not installed on the optical transmission path, a new splitter 33 may be placed immediately before the in-home MC 31 in the user building U1. When communication is interrupted for several seconds, the optical fiber is removed from the home MC 31, and the optical fiber is inserted into the splitter 33 so as to form an optical transmission path as shown in FIG.
  • uplink frames sent from the home MC 31 are sent to both home MCs (35#1, 35#2), and downlink frames from both home MCs (35#1, 35#2) are sent to the home MC 31. arrive.
  • the home MC 31 operates like an OLT of a normal PON, and similarly, the office MCs (35#1, 35#2) operate like ONUs of a normal PON. That is, the in-home MC 31 and the in-office MC (35#1, 35#2) establish a link-up, and the in-home MC 31 uses time division communication with both in-office MCs (35 #1, 35 #2). Communication will be possible at the same time.
  • the in-home MC 31 is configured to discard downlink frames from the in-office MC 35#2 and transmit uplink frames to the in-office MC 35#1 using the LLID ("previous setting"). Therefore, frames are transmitted and received only between the home MC 31 and the office MC 35 #1 (uplink frame path Dup and downlink frame path Ddp).
  • This "previous setting" is a setting for preventing the home MC 31 from receiving duplicate broadcast frames transmitted from both in-house MCs.
  • Step S02 This is the state shown in FIG. 4(B).
  • the home MC 31 uses the LLID to change the destination of the uplink frame from the home MC 35#1 to the home MC 35#2 at an arbitrary timing (uplink frame route Dus).
  • the home MC 31 changes its settings ("new settings") to be able to receive downlink frames from both in-station MCs (35#1, 35#2) (downlink frame routes Ddp and Dds).
  • this "new setting" becomes effective, broadcast frames arrive twice, causing momentary interruptions due to frame discards. However, the unicast frame can be received by the home MC 31 without loss.
  • Step S03 This is the state shown in FIG. 4(C).
  • the uplink frame that has passed through the intra-office MC 35#2 passes through the L2 switch 16#2 and a switch (ring) on the way to the terminal specified by the destination MAC address of the frame.
  • the switch 16 #2 and the switch (ring) automatically learn the source MAC address of the frame and the port that received the frame, and send the downlink frame with the destination MAC address of the home MC 31 to the port destined for the home MC 35 #2. It will start sending.
  • uplink frames take the uplink frame route Dus by selecting the LLID
  • downlink frames take the downlink frame route Dds by automatic destination learning
  • frames in both the up and down directions pass through the intra-office MC 35 #2.
  • Step S04 This is the state shown in FIG. 4(C).
  • the in-office MC 35#1 Up to step S03, the in-office MC 35#1 is in a state of not contributing to communication with the in-home MC 31. Therefore, the in-home MC 31 is finally configured to discard the downlink frame from the in-office MC 35 #1 ("completion setting").
  • This "completion setting" is a safety setting for preventing duplicate transmission of broadcast frames from both in-house MCs (35#1 and 35#2). The momentary interruption that has continued since step S02 ends here. Since the switching of the in-office MC is completed above, it becomes possible to remove the in-office MC 35#1 of the relocation source building To1.
  • 10#1, 10#2 Uninterrupted communication device 11#1, 11#2: In-home MC 15#1, 15#2: Internal MC 16#1, 16#2: L2 switch 21, 21#1, 21#2: Home MC 25, 25#1, 25#2: Internal MC 26: L2 switch 31: Home MC 35#1, 35#2: Internal MC 50: Relay network

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

Le but de la présente invention est de fournir un procédé de commutation de dispositif de communication et un système de communication qui sont capables de commuter des dispositifs de communication à un faible coût sans nécessiter de travail pour mettre en œuvre une redondance.　Le procédé de commutation de dispositif de communication selon la présente invention réalise un travail de commutation par la procédure suivante. (Étape 1) Un réglage est effectué de telle sorte qu'un dispositif de terminaison (31) change une trame de liaison montante à destination d'un dispositif de relais (35#2) vers une destination de relocalisation sur la base d'un LLID et reçoit une trame de liaison descendante à la fois depuis le dispositif de relais (35#1) de la destination de relocalisation et depuis un dispositif de relais (35#2) d'une source de relocalisation. (Étape 2) Une fonction d'un commutateur L2 (16) (pour apprendre automatiquement l'adresse MAC de source de transmission d'une trame de liaison montante et un port qui a reçu la trame et transmettre, au port, une trame de liaison descendante avec le dispositif de terminaison en tant qu'adresse MAC de destination) est utilisée pour amener la trame de liaison descendante à passer automatiquement à travers le dispositif de relais (35#2) de la destination de relocalisation.
PCT/JP2022/013465 2022-03-23 2022-03-23 Procédé de commutation de dispositif de communication, et système de communication WO2023181162A1 (fr)

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JP2017175177A (ja) * 2016-03-18 2017-09-28 西日本電信電話株式会社 局側光回線終端装置、冗長装置切替方法及び冗長装置切替プログラム

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017175177A (ja) * 2016-03-18 2017-09-28 西日本電信電話株式会社 局側光回線終端装置、冗長装置切替方法及び冗長装置切替プログラム

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