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WO2018137578A1 - Détection de liaison - Google Patents

Détection de liaison Download PDF

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Publication number
WO2018137578A1
WO2018137578A1 PCT/CN2018/073590 CN2018073590W WO2018137578A1 WO 2018137578 A1 WO2018137578 A1 WO 2018137578A1 CN 2018073590 W CN2018073590 W CN 2018073590W WO 2018137578 A1 WO2018137578 A1 WO 2018137578A1
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WO
WIPO (PCT)
Prior art keywords
link
switching unit
unit
board
data unit
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Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2018/073590
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English (en)
Chinese (zh)
Inventor
刘淑杰
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New H3C Technologies Co Ltd
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New H3C Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity

Definitions

  • Network devices such as routers and switches can support a multi-level switching architecture, with multiple switching units in each level, with each switching unit in each level being connected to all switching units in the next level.
  • the multi-level switching architecture can achieve strict non-blocking, re-arrangeable, and Scalable. Compared with the traditional architecture, the multi-level switching architecture handles burst traffic and congestion avoidance. There are huge improvements in recursive extensions.
  • FIG. 1 is a schematic diagram of a secondary switching architecture shown in an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of a three-level switching architecture shown in an embodiment of the present disclosure
  • FIG. 3 is a flowchart of a link detecting method according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a link detecting apparatus according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a board to which a link detecting apparatus according to an embodiment of the present disclosure is applied.
  • the structure of the device adopting the two-stage switching architecture is as shown in FIG. 1.
  • the switching architecture of the device is composed of Stage 1 and Stage 2.
  • the service board in the device belongs to Stage 1, and the switching network board belongs to Stage 2.
  • Stage 1 may include n switching units
  • Stage 2 may include k switching units
  • each of Stage 1 is connected to all switching units in Stage 2, where n and k are positive integers greater than or equal to 1.
  • the "switching unit" herein can be implemented, for example, by a forwarding chip.
  • the service boards or switching network boards in the two-level switching architecture may also be distributed in one device or distributed in multiple devices.
  • a cluster device consisting of multiple devices can adopt a switch fabric of three or more levels.
  • the three-level switch fabric of the cluster device can be composed of Stage 1, Stage 2, and Stage 3.
  • the service boards in the cluster device belong to Stage 1 or Stage 3.
  • the switching network board belongs to Stage2.
  • Each of Stage1 and Stage3 may include n switching units, and Stage2 may include k switching units, where n and k are positive integers greater than or equal to 1.
  • Each switching unit in Stage1 is connected to all switching units in Stage2, and each switching unit in Stage2 is connected to all switching units in Stage3.
  • a typical three-level switching architecture can be implemented by the CLOS architecture.
  • the switching unit on the Stage1 can send a unicast message to the switching unit on the Stage2 by searching the local routing table, and the switching unit on the Stage2 can search again.
  • the local routing table returns the unicast packet to the switching unit on Stage1 to detect whether the link is reachable in both directions.
  • the switching unit on the Stage1 and the switching unit on the Stage2 need to send the unicast packet by searching the local routing table, and the local routing table is prohibited from being updated before the unicast packet is sent, which may result in data flow. Interrupted. Moreover, this method does not consider the detection of links in cluster devices that employ a three-level or higher switching fabric.
  • the following embodiments of the present disclosure provide a link detection method, and a link detection apparatus to which the method can be applied, which can be applied not only to a switch architecture of two or more levels but also to a third level.
  • a link detection apparatus to which the method can be applied, which can be applied not only to a switch architecture of two or more levels but also to a third level.
  • the cluster device of the above switching architecture for example, it can be applied to the five-level CLOS architecture.
  • the method in the embodiment of the present disclosure may be implemented by a board of each of the network devices that adopts a switching architecture of two or more levels, where each level may include multiple boards, and the boards in each level may include More than one exchange unit.
  • each board may include more than two switching units in terms of service performance.
  • the board can be a service board or a switching network board.
  • the method includes: obtaining, for each local switching unit on the board of the current level, connection information of the link accessed by the local switching unit; and controlling the local switching unit according to the connection information of the link Transmitting, by the link, a data unit to a peer switching unit on a next-level board accessed by the link, so that the peer switching unit passes the data unit after receiving the data unit. Returning to the local switching unit; when the local switching unit receives the returned data unit, it can be determined that the link is bidirectionally reachable.
  • the switching network board belonging to Stage2 in the network equipment adopting the secondary switching architecture or the service board belonging to Stage3 in the network equipment adopting the three-level switching architecture, There is a next level, so the last stage of the board does not need to perform the above method.
  • the board controls the local switching unit on the card to send the data unit to the peer switching unit on the next-level board, so that the peer switching unit receives the data unit. Then, the data unit is returned to the local switching unit through the link, and the bidirectional reachability of the link is detected, that is, the local switching unit ⁇ the opposite switching unit direction and the opposite switching unit are detected. ⁇ Accessibility of the direction of the local exchange unit.
  • the method in this embodiment can detect the link between the switching unit on each level of the switch board and the switching unit on the next-level board, so that the routing device adopts several levels of switching architecture, for example, three.
  • Level 2 or higher switching architecture can also detect the link between the switching units on the adjacent two-level boards, and finally realize the bidirectional reachability detection of the links between the switching units on the boards of different levels. For both single and cluster devices.
  • the secondary switching fabric is composed of Stage1 and Stage2. If the boards in the architecture are distributed in one device, the service boards in the device belong to Stage1, and the switching network board belongs to Stage2. Stage 1 includes n switching units, Stage 2 includes k switching units, and each of Stage 1 is connected to all switching units in Stage 2. Where n and k are positive integers greater than or equal to 1.
  • the service board belonging to the Stage 1 can perform the link detection method shown in FIG. 3 for each local switching unit on the service board.
  • the method includes the following steps:
  • Step S301 the physical connection state and connection information of the link accessed on the local switching unit are obtained.
  • the physical connection status of the link may be up or down. For example, when there is no connection on the port, or the port is not in good contact with the transmission line that accesses the port, the physical connection status of the corresponding link is abnormal.
  • the connection information of the link may include: an ID of the local switching unit, an ID of a port connected to the link on the local switching unit, an ID of the peer switching unit connected to the link, and a connection on the opposite switching unit.
  • the ID of the port of the link It can be seen that the two ends of the link are respectively connected to: the port of the local switching unit belonging to the service board of the Stage1, and the port of the peer switching unit belonging to the switching network board of the Stage 2.
  • step S302 it can be determined whether the physical connection status of the link is normal. If yes, step S303 is performed; otherwise, the flow is exited.
  • step S303 a data unit can be constructed.
  • the data unit can carry the connection information of the link.
  • Step S304 the routing and forwarding information of the data unit can be created according to the connection information of the link.
  • the routing forwarding information specifies an outbound port for forwarding each hop of the data unit.
  • the data unit can be sent from the port of the local switching unit to the port of the local switching unit, and then the port of the opposite switching unit is returned to the port of the local switching unit. Therefore, the route forwarding information may be used to indicate that the data unit is forwarded by two hops, where the outbound port of the first hop is the port connecting the link on the local switching unit, and the egress port of the second hop is the peer switching unit. The port on which the link is connected.
  • Step S305 the local switching unit encapsulates the routing forwarding information on the data unit, and then sends the information to the peer switching unit through the link.
  • the outbound port of the first hop of the route forwarding information is the port on the local switching unit, and the egress port of the second hop is the port on the peer switching unit. Therefore, in step S305, the local switching unit is After the routing information is encapsulated in the data unit, the egress port of the first hop in the routing information, that is, the port on the local switching unit, is sent out to reach the port on the peer switching unit.
  • the method for encapsulating the routing information in the data unit may be: using the data unit as a payload, and encapsulating the header carrying the routing forwarding information and the content of the packet into a complete report. Text.
  • the peer switching unit After receiving the data unit and the route forwarding information, the peer switching unit forwards the second hop of the information through the route, that is, the port that receives the data unit and the route forwarding information on the peer switching unit, and the data unit Forward it to reach the port on the local switching unit.
  • Step S306 if the local switching unit determines that the received data unit is the same as the content of the transmitted data unit after receiving the data unit through the link, the link may be determined to be bidirectionally reachable. Otherwise, the link may be determined. The link is not bidirectionally reachable and then exits the process.
  • step S306 it can be determined whether the received data unit and the transmitted data unit are the same message by determining whether the received data unit is identical to the content of the transmitted data unit. For example, the connection information of the link carried in the received data unit and the connection information carried in the transmitted data unit may be compared. If they are identical, it may be determined that the received data unit is the same message as the transmitted data unit.
  • the board can perform all the links connected to the switching unit on the next-level board by polling the local switching unit, that is, repeatedly performing the foregoing steps S301 to S306 until all the up states are determined.
  • Bidirectional reachability information for the link may further include the step of: notifying the determined control result (bidirectional reachability information) of the link that is bidirectionally reachable to the main control board in the network device.
  • the service board that belongs to the Stage1 can also notify the main control board of the detection result of the link, that is, whether the link is bidirectionally reachable, so that the administrator can view the exchange unit between the switching units through the main control board. Bidirectional reachability of the link.
  • the physical connection state of the link connected to the local switching unit can be obtained, and when the physical connection state of the link is normal, the bidirectional reachability of the link can be detected, thereby There is no need to detect links with abnormal physical connection status, which avoids unnecessary detection work.
  • the routing forwarding information of the data unit may be created according to the connection information of the link, where the outgoing port of each hop of the data unit is forwarded.
  • the local switching unit may forward the information according to the route, and send the data unit and the routing forwarding information to the peer switching unit through the link, and the peer switching unit may also forward the data unit to the data unit according to the routing information.
  • the road is returned to the local exchange unit. Since the outgoing port of each hop is directly specified in the routing and forwarding information, it is not necessary to look up the local routing table, and the data unit can be transmitted according to the routing forwarding information, and the point-to-point transmitting data unit is realized. Further, since the transmitting data unit does not need to rely on the local routing table, the problem of prohibiting the update of the local routing table and causing the data flow to be interrupted is avoided.
  • the three-level switching architecture when the cluster device adopts a three-level switching architecture, may be composed of Stage1, Stage2, and Stage3.
  • the service board in the cluster device belongs to Stage1 or Stage3, and the switching network board belongs to Stage2.
  • Each of Stage1 and Stage3 may include n switching units, and Stage2 may include k switching units, where n and k are positive integers greater than or equal to 1.
  • Each switching unit in Stage1 can be connected to all switching units in Stage2, and each switching unit in Stage2 can be connected to all switching units in Stage3.
  • each local switching unit belonging to the service board of Stage1 can perform the link detection method shown in FIG. 3, so that it can detect that it belongs to Stage1. Whether the link between the switching unit on the service board and the switching unit on the switching network board belonging to Stage2 is bidirectional.
  • each local switching unit belonging to the switching network board of the Stage 2 also performs the link detection method shown in FIG. 3, so that the switching unit on the switching network board belonging to the Stage 2 and the service board belonging to the Stage 3 can be detected.
  • the link between the upper switching units is bidirectionally reachable. Therefore, the bidirectional reachability of the link between the switching units on the boards of any different stages in Stage 1, Stage 2, and Stage 3 can be finally detected.
  • the method of the embodiment of the present disclosure may further include the step of: notifying the determined control result of whether the link is bidirectionally reachable to the main control board in the network device.
  • the service board that belongs to the Stage1 and the switching network board that belongs to the Stage2 can also notify the main control board of the detection result of the link, that is, whether the link is bidirectionally reachable, so that the administrator can view the chain between the switching units through the main control board. Two-way accessibility of the road.
  • the method of the embodiment of the present disclosure may be performed according to a predetermined time interval.
  • the link detection method further includes: configuring a timer on each level of the board, and determining whether the timer reaches the preset. If the time is up, the board starts to poll all links established on the local switching unit and connected to the switching unit on the next-level board.
  • the execution of the method of the embodiment of the present disclosure may be triggered by an instruction or an event, which is not limited by the disclosure.
  • the link detection method of the foregoing embodiment of the present disclosure is simple to implement, and the link detection result is accurate, which greatly shortens the time required for detection.
  • the working mode of each port can be saved in the local switching unit of each level of the board, and the pair of the port can be determined by the working mode of the port on the local switching unit.
  • the board on which the switch unit resides is the upper-level board or the next-level board of the board.
  • the local switching unit on the switching network board of the Stage 2 stores two working modes: mode1 and mode2, and the working mode of the port of the local switching unit connected to the peer switching unit on the service board of the Stage1 is Mode1, the working mode of the port of the local switching unit connected to the peer switching unit on the service board of the Stage3 is mode2, so that if the working mode of the port on the local switching unit is mode1, the mode can be determined.
  • the board where the peer switch unit is connected to the port is the upper-level board. If the working mode of the port on the local switch unit is mode2, you can determine that the board of the peer switch unit connected to the port is down. Level 1 veneer.
  • the present disclosure also provides an embodiment of the link detecting device.
  • the link detecting device can be implemented by software, or can be implemented by hardware or a combination of hardware and software.
  • the embodiment of the link detecting apparatus can be used on each board in a network device adopting a switching architecture of two or more levels.
  • FIG. 4 is a schematic structural diagram of a link detecting apparatus according to an embodiment of the present disclosure.
  • the link detecting device is applicable to each board in the switching network of two or more levels, and may include: an information acquiring unit 401, a control unit 402, and a determining unit 403, where:
  • the information obtaining unit 401 is configured to obtain connection information of a link accessed by the local switching unit for each local switching unit on the current board.
  • the control unit 402 is configured to: according to the connection information of the link acquired by the information acquiring unit 401, control the local switching unit to send the data unit to the opposite switching unit on the next-level board accessed by the link, After the peer switching unit receives the data unit, the data unit is returned to the local switching unit through the link;
  • the determining unit 403 is configured to determine that the link is bidirectionally reachable when the local switching unit receives the returned data unit.
  • the control unit 402 is specifically configured to control the connection information of the link acquired by the information acquiring unit 401 in the following manner, and control the local switching unit to access the next-level board of the link through the link.
  • the peer switching unit sends the data unit:
  • routing forwarding information specifies an outgoing port of each hop that forwards the data unit
  • the local switching unit After the local switching unit encapsulates the route forwarding information on the data unit, the local switching unit sends the data to the peer switching unit on the next-level board, so that the peer switching unit forwards the information according to the route. The unit returns to the local switching unit through the link.
  • the route forwarding information is used to indicate that the data unit is forwarded by two hops, where the egress port of the first hop is the port connected to the link on the local switching unit, and the egress port of the second hop is the next level.
  • connection information of the link includes: the ID of the local switching unit, the ID of the port connected to the link on the local switching unit, the ID of the peer switching unit on the next-level board, and the peer switching unit. The ID of the port on which the link is connected.
  • the determining unit 403 is specifically configured to determine that the link is bidirectionally reachable when the local switching unit receives the returned data unit in the following manner:
  • the local switching unit determines that the received data unit is the same as the content of the transmitted data unit after receiving the data unit through the link, it is determined that the link is bidirectionally reachable.
  • the information obtaining unit 401 is further configured to acquire a physical connection state of the link.
  • the control unit 402 is specifically configured to control the local switching unit to the chain according to the connection information of the link acquired by the information acquiring unit 401, if the physical connection status of the link acquired by the information acquiring unit 401 is normal.
  • the peer switching unit on the next-level board connected to the path sends the data unit.
  • FIG. 5 is a schematic structural diagram of a board to which a link detecting apparatus according to an embodiment of the present disclosure is applied.
  • the board can be applied to a switching network of two or more levels.
  • the board may include: more than one switching unit 501, a processor 10, an internal bus 20, a network interface 30, and a machine-readable storage medium 40.
  • the board may further include other components according to actual functions. Parts, no longer elaborate on this.
  • the machine-readable storage medium 40 referred to herein can be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, and the like.
  • the machine-readable storage medium may be: RAM (Radom Access Memory), volatile memory, non-volatile memory, flash memory, storage drive (such as a hard disk drive), solid state drive, any type of storage disk. (such as a disc, dvd, etc.), or a similar storage medium, or a combination thereof.
  • processor 10 By executing machine executable instructions stored in machine readable storage medium 40, processor 10 is caused to perform the following operations:
  • the local switching unit When the local switching unit receives the returned data unit, it is determined that the link is bidirectionally reachable.
  • the processor 10 when the local switching unit is controlled to send a data unit to a peer switching unit on a next-level board accessed by the link according to the connection information of the link, the processor 10 Also prompted by the machine executable instructions:
  • routing forwarding information specifies an outbound port for forwarding each hop of the data unit
  • the route forwarding information is used to indicate that the data is forwarded by two hops, where an outbound port of the first hop is a port connected to the link on the local switching unit, and a second hop
  • the egress port is the port connecting the link on the peer switching unit on the next-level board.
  • connection information of the link includes: an identifier ID of the local switching unit, an ID of a port that connects the link on the local switching unit, and the next-level board ID of the peer switching unit, the ID of the port connecting the link on the peer switching unit.
  • processor 10 upon determining that the link is bi-directionally reachable, processor 10 is also caused by the machine executable instructions:
  • processor 10 is also caused by the machine executable instructions:
  • the local switching unit is configured to send data to the opposite switching unit on the next-level board accessed by the link according to the connection information of the link. unit.
  • the device embodiment since it basically corresponds to the method embodiment, reference may be made to the partial description of the method embodiment.
  • the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located A place, or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.

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

Abstract

L'invention concerne un procédé de détection de liaison et une carte unique applicable à un réseau commuté avec deux étages ou plus. Selon l'illustration du procédé, des informations de connexion d'une liaison accessible sur une unité de commutation locale peuvent être acquises pour chaque unité de commutation locale sur l'étage actuel de la carte unique. Selon les informations de connexion de la liaison, l'unité de commutation locale est commandée pour envoyer une unité de données à une unité de commutation homologue sur l'étage suivant d'une carte unique accessible par la liaison, de sorte que l'unité de commutation d'homologue renvoie l'unité de données à l'unité de commutation locale par l'intermédiaire de la liaison après réception de l'unité de données. Lorsque l'unité de commutation locale reçoit l'unité de données renvoyée par l'unité de commutation homologue, il est déterminé que la liaison est bidirectionnelle.
PCT/CN2018/073590 2017-01-24 2018-01-22 Détection de liaison Ceased WO2018137578A1 (fr)

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CN110730035A (zh) * 2018-07-16 2020-01-24 中兴通讯股份有限公司 一种光口连接检测方法、交换单板及计算机存储介质

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