WO2018137578A1 - 链路检测 - Google Patents

链路检测 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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link
switching unit
unit
board
data unit
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French (fr)
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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

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  • 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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Abstract

本公开提供一种适用于两级以上交换网络的链路检测方法及单板。根据该方法的示例，可针对本级单板上的每一个本端交换单元，获取本端交换单元上接入的链路的连接信息。根据该链路的连接信息，控制本端交换单元向该链路所接入的下一级单板上的对端交换单元发送数据单元，以使对端交换单元在接收到该数据单元后，将该数据单元通过该链路返回给本端交换单元。在本端交换单元接收到由对端交换单元返回的数据单元时，确定该链路双向可达。

Description

链路检测
相关申请的交叉引用
本专利申请要求于2017年1月24日提交的、申请号为201710055214.2、发明名称为“链路检测方法及装置”的中国专利申请的优先权，该申请的全文以引用的方式并入本文中。
背景技术
诸如路由器和交换机等网络设备可以支持多级交换架构，每一级中包括多个交换单元，每一级中的每个交换单元均与下一级中的所有交换单元连接。采用多级交换架构可以实现严格的无阻塞(Non-blocking)、可重构(Re-arrangeable)、可扩展(Scalable)，与传统架构相比，多级交换架构在突发流量处理、拥塞避免、递归扩展上均有巨大的提升。
附图说明
图1是本公开实施例示出的二级交换架构的示意图；
图2是本公开实施例示出的三级交换架构的示意图；
图3是本公开实施例示出的链路检测方法的流程图；
图4是本公开实施例示出的链路检测装置的一种结构示意图；
图5是本公开实施例示出的链路检测装置所应用的单板的一种结构示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
很多网络设备可采用两级以上交换架构，例如，路由设备和交换设备均可以采用两级以上交换架构。其中，采用两级交换架构的设备的结构如图1所示，该设备的交换架构由Stage (级)1和Stage2组成，该设备中的业务板属于Stage1，交换网板属于Stage2。Stage1中可包括n个交换单元，Stage2中可包括k个交换单元，Stage1中的每一个交换单元均与Stage2中的所有交换单元连接，其中，n和k为大于等于1的正整数。本文中的“交换单元”例如可以通过转发芯片来实现。当然，两级交换架构中的业务板或者交换网板也可以分布于一个设备中，也可以分布于多个设备中。
由多台设备构成的集群设备可采用三级以上的交换架构，如图2所示，该集群设备的三级交换架构可由Stage1、Stage2和Stage3组成，该集群设备中的业务板属于Stage1或Stage3，交换网板属于Stage2。Stage1和Stage3中均可包括n个交换单元，Stage2中可包括k个交换单元，其中，n和k为大于等于1的正整数。Stage1中的每一个交换单元均与Stage2中的所有交换单元连接，Stage2中的每一个交换单元均与Stage3中的所有交换单元连接。典型的三级交换架构可以由CLOS架构实现。
一种可选的采用两级交换架构的设备中的链路检测方法中，Stage1上的交换单元可通过查找本地路由表向Stage2上的交换单元发送单播报文，Stage2上的交换单元可再查找本地路由表将该单播报文返回给Stage1上的交换单元，从而检测链路是否双向可达。
但是，上述方法中，Stage1上的交换单元和Stage2上的交换单元需要通过查找本地路由表来发送该单播报文，在发送该单播报文之前，禁止更新本地路由表，从而可能会导致数据流中断。而且，该方法没有考虑对于采用三级以上交换架构的集群设备中的链路的检测。
由此，本公开以下实施例中提供了一种链路检测方法，以及一种可以应用该方法的链路检测装置，不仅可以应用于采用两级以上交换架构中，也可以应用于采用三级以上交换架构的集群设备中，例如可以应用到五级CLOS架构。
本公开实施例的方法可以由采用两级以上交换架构的网络设备中的每一级的单板来实现，其中，每一级中可包括多个单板，每一级中的单板可包括一个以上的交换单元。一般来说，从业务性能上考虑，每个单板可包括两个以上的交换单元。其中，单板可以是业务板或交换网板。该方法包括：针对本级单板上的每一个本端交换单元，可获取该本端交换单元上接入的链路的连接信息；根据该链路的连接信息，可控制该本端交换单元通过该链路向该链路所接入的下一级单板上的对端交换单元发送数据单元，以使该对端交换单元在接收到该数据单元后，将该数据单元通过该链路返回给该本端交换单元；在该本端交换单元接收到返回的数据单元时，可确定该链路双向可达。
对于最后一级的单板来说，例如，采用二级交换架构的网络设备中属于Stage2的交换网 板，或者，采用三级交换架构的网络设备中属于Stage3的业务板，由于最后一级不存在下一级，因此，该最后一级的单板不需要执行上述方法。
在上述实施例的方法中，单板控制本单板上的本端交换单元通过链路向下一级单板上的对端交换单元发送数据单元，以使对端交换单元接收到该数据单元后再将该数据单元通过该链路返回给本端交换单元，实现了对该链路的双向可达性的检测，即，检测本端交换单元→对端交换单元方向、以及对端交换单元→本端交换单元方向的可达性。
另外，本实施例的方法可以对每一级单板上的交换单元与下一级单板上的交换单元之间的链路进行检测，从而，无论路由设备采用几级交换架构，例如采用三级以上交换架构，也可以通过对相邻两级单板上的交换单元之间的链路进行检测，最终实现不同级的单板上的交换单元之间的链路的双向可达性的检测，对于单个设备和集群设备均适用。
如图1所示，二级交换架构，该架构由Stage1和Stage2组成，若该架构中的单板分布于一个设备中，则该设备中的业务板属于Stage1，交换网板属于Stage2。Stage1中包括n个交换单元，Stage2中包括k个交换单元，Stage1中的每一个交换单元均与Stage2中的所有交换单元连接。其中，n和k为大于等于1的正整数。
基于如图1所示的二级交换架构，本公开实施例中，属于Stage1的业务板可针对本业务板上的每一个本端交换单元，均执行如图3所示的链路检测方法，该方法包括以下步骤：
步骤S301，可获取本端交换单元上接入的链路的物理连接状态和连接信息。
其中，链路的物理连接状态可为正常(up)或异常(down)。例如，当端口上没有连线，或者端口与接入该端口的传输线之间接触不好时，对应的链路的物理连接状态为异常。
该链路的连接信息中可包括：本端交换单元的ID，本端交换单元上连接该链路的端口的ID，该链路接入的对端交换单元的ID，对端交换单元上连接该链路的端口的ID。可见，该链路两端分别接入：属于Stage1的业务板上的本端交换单元的端口，以及属于Stage2的交换网板上的对端交换单元的端口。
步骤S302，可判断该链路的物理连接状态是否正常，若是，则执行步骤S303，否则，退出本流程。
步骤S303，可构造数据单元(datacell)。
其中，该数据单元中可以携带该链路的连接信息。
步骤S304，可根据该链路的连接信息，创建该数据单元的路由转发信息。
其中，该路由转发信息中指定了转发该数据单元的每一跳的出端口。该数据单元可从本端交换单元上连接该链路的端口发出，到达对端交换单元上连接该链路的端口后，再从该对端交换单元的端口返回到本端交换单元的端口。因此，该路由转发信息可用于指示通过两跳转发该数据单元，其中，第一跳的出端口为本端交换单元上连接该链路的端口，第二跳的出端口为对端交换单元上连接该链路的端口。
步骤S305，本端交换单元将该数据单元上封装该路由转发信息后，通过该链路发送给对端交换单元。
由于该路由转发信息中的第一跳的出端口为本端交换单元上的端口，第二跳的出端口为对端交换单元上的端口，因此，在步骤S305中，本端交换单元在将该数据单元上封装该路由转发信息后，会通过该路由转发信息中第一跳的出端口，即本端交换单元上的端口发送出去，从而到达对端交换单元上的端口。
其中，将该数据单元封装该路由转发信息的方式可以是：将该数据单元作为报文内容(payload)，将携带有该路由转发信息的报头、以及该报文内容进行封装成一个完整的报文。
对端交换单元接收到该数据单元和路由转发信息后，通过该路由转发信息中第二跳的出端口，即对端交换单元上接收到该数据单元和路由转发信息的端口，将该数据单元转发出去，从而到达本端交换单元上的端口。
步骤S306，若本端交换单元在通过该链路接收到数据单元后，判断出接收到的数据单元与发送的数据单元的内容相同，则可确定该链路双向可达，否则，可确定该链路不是双向可达，之后退出本流程。
在步骤S306中，可通过判断接收到的数据单元与发送的数据单元的内容是否相同，可以确定出接收到的数据单元与发送的数据单元是否为同一报文。例如，可以比较接收到的数据单元中携带的链路的连接信息与发送的数据单元中携带的连接信息，若完全相同，则可确定接收到的数据单元与发送的数据单元是同一报文。
其中，本单板可通过轮询本端交换单元上接入的与下一级单板上的交换单元连接的所有链路，即重复执行上述步骤S301至步骤S306，直至确定出所有up状态的链路的双向可达信息。在本公开实施例的方法中还可以包括以下步骤：将确定出的所述链路是否双向可达的检测结果(双向可达信息)通知给所述网络设备中的主控板。这样，在步骤S306之后，属于Stage1的业务板还可以将该链路的检测结果，即，该链路是否双向可达通知给主控板，以便管理人员通过主控板查看交换单元之间的链路的双向可达性。
在如图3所示的方法中，可获取本端交换单元上接入的链路的物理连接状态，在该链路的物理连接状态正常时，可检测该链路的双向可达性，从而，无需对物理连接状态异常的链路进行检测，避免了不必要的检测工作。
在对链路进行检测时，可根据链路的连接信息创建数据单元的路由转发信息，该路由转发信息中指定了转发该数据单元的每一跳的出端口。本端交换单元可以根据该路由转发信息，将该数据单元和该路由转发信息通过该链路一起发送给对端交换单元，对端交换单元也可以根据该路由转发信息将该数据单元通过该链路返回给本端交换单元。由于直接在路由转发信息中指定了每一跳的出端口，因此，无需查找本地路由表，根据该路由转发信息即可发送数据单元，实现了点到点的发送数据单元。进一步的，由于发送数据单元无需依赖于本地路由表，因此，也就避免了禁止更新本地路由表而导致数据流中断的问题。
另一种实施例中，如图2所示，当集群设备采用三级交换架构时，该三级交换架构可由Stage1、Stage2和Stage3组成。该集群设备中的业务板属于Stage1或Stage3，交换网板属于Stage2。Stage1和Stage3中均可包括n个交换单元，Stage2中可包括k个交换单元，其中，n和k为大于等于1的正整数。Stage1中的每一个交换单元均可与Stage2中的所有交换单元连接，Stage2中的每一个交换单元均可与Stage3中的所有交换单元连接。
基于如图2所示的三级交换架构，本公开实施例中，属于Stage1的业务板每一个本端交换单元，均可执行如图3所示的链路检测方法，从而可以检测出属于Stage1的业务板上的交换单元与属于Stage2的交换网板上的交换单元之间的链路是否双向可达。另外，属于Stage2的交换网板的每一个本端交换单元，也会执行如图3所示的链路检测方法，从而能够检测出属于Stage2的交换网板上的交换单元与属于Stage3的业务板上的交换单元之间的链路是否双向可达。从而，最终可以检测出Stage1、Stage2、Stage3中任意不同级的单板上的交换单元之间的链路的双向可达性。
在本公开实施例的方法中还可以包括以下步骤：将确定出的所述链路是否双向可达的检测结果通知给所述网络设备中的主控板。这样，属于Stage1的业务板和属于Stage2的交换网板还可以将链路的检测结果，即链路是否双向可达通知给主控板，以便管理人员通过主控板查看交换单元之间的链路的双向可达性。
在实际实施过程中，可以按照预定时间间隔来执行本公开实施例的方法，具体的，上述链路检测方法还包括：在每一级单板上配置定时器，并判断定时器是否达到预设时间，若达到预设时间，则本单板开始轮询本端交换单元上建立的与下一级单板上的交换单元连接的所有链路。当然，也可以通过指令或事件来触发本公开实施例的方法的执行，本公开对此不做 限定。本公开上述实施例的链路检测方法实现简单，链路检测结果准确，大大缩短了检测所需时间。
另外，在上述实施例的方法中，每一级单板的本端交换单元中可保存有各个端口的工作模式，通过本端交换单元上的端口的工作模式即可判断出该端口连接的对端交换单元所在的单板是本级单板的上一级单板还是下一级单板。例如，属于Stage2的交换网板上的本端交换单元中保存有两种工作模式：mode1和mode2，该本端交换单元上连接属于Stage1的业务板上的对端交换单元的端口的工作模式为mode1，该本端交换单元上连接属于Stage3的业务板上的对端交换单元的端口的工作模式为mode2，这样，若该本端交换单元上的端口的工作模式为mode1，则可以判断出该端口连接的对端交换单元所在的单板为上一级单板，若该本端交换单元上的端口的工作模式为mode2，则可以判断出该端口连接的对端交换单元所在单板为下一级单板。
与前述链路检测方法的实施例相对应，本公开还提供了链路检测装置的实施例。该链路检测装置可以通过软件实现，也可以通过硬件或者软硬件结合的方式实现。该链路检测装置的实施例可以用在采用两级以上交换架构的网络设备中的各级单板上。
请参考图4，为本公开实施例的链路检测装置的一种结构示意图。该链路检测装置适用于两级以上的交换网络中的各级单板，并且可包括：信息获取单元401、控制单元402和确定单元403，其中：
信息获取单元401，用于针对本级单板上的每一个本端交换单元，获取本端交换单元上接入的链路的连接信息；
控制单元402，用于根据信息获取单元401获取到的该链路的连接信息，控制本端交换单元向该链路所接入的下一级单板上的对端交换单元发送数据单元，以使对端交换单元在接收到该数据单元后，将该数据单元通过该链路返回给本端交换单元；
确定单元403，用于在本端交换单元接收到返回的数据单元时，确定该链路双向可达。
其中，控制单元402具体用于通过以下方式根据信息获取单元401获取到的该链路的连接信息，控制本端交换单元通过该链路向该链路所接入的下一级单板上的对端交换单元发送数据单元：
根据信息获取单元401获取到的该链路的连接信息，创建数据单元的路由转发信息，其中，该路由转发信息中指定了转发该数据单元的每一跳的出端口；
控制本端交换单元在该数据单元上封装该路由转发信息后，通过该链路发送给下一级单 板上的对端交换单元，以使对端交换单元根据该路由转发信息，将该数据单元通过该链路返回给本端交换单元。
其中，该路由转发信息用于指示通过两跳转发该数据单元，其中，第一跳的出端口为本端交换单元上连接该链路的端口，第二跳的出端口为下一级单板上的对端交换单元上连接该链路的端口。
其中，该链路的连接信息中包括：本端交换单元的ID，本端交换单元上连接该链路的端口的ID，下一级单板上的对端交换单元的ID，对端交换单元上连接该链路的端口的ID。
其中，确定单元403具体用于通过以下方式在本端交换单元接收到返回的数据单元时，确定该链路双向可达：
若本端交换单元在通过该链路接收到数据单元后，判断出接收到的数据单元与发送的数据单元的内容相同，则确定该链路双向可达。
其中，信息获取单元401，还用于获取该链路的物理连接状态；
则，控制单元402具体用于若信息获取单元401获取到的该链路的物理连接状态为正常，则根据信息获取单元401获取到的该链路的连接信息，控制本端交换单元向该链路所接入的下一级单板上的对端交换单元发送数据单元。
如图5所示，为本公开实施例的链路检测装置所适用的单板的一种结构示意图。其中，该单板可应用于两级以上的交换网络中。如图5所示，单板可以包括：一个以上的交换单元501、处理器10、内部总线20、网络接口30、以及机器可读存储介质40，根据实际功能，该单板中还可以包括其他部件，对此不再赘述。
本文中提到的机器可读存储介质40可以是任何电子、磁性、光学或其它物理存储装置，可以包含或存储信息，如可执行指令、数据，等等。例如，机器可读存储介质可以是：RAM(Radom Access Memory，随机存取存储器)、易失存储器、非易失性存储器、闪存、存储驱动器(如硬盘驱动器)、固态硬盘、任何类型的存储盘(如光盘、dvd等)，或者类似的存储介质，或者它们的组合。
通过执行机器可读存储介质40中存储的机器可执行指令，处理器10被促使执行以下操作：
针对本级单板上的每一个本端交换单元，获取所述本端交换单元上接入的链路的连接信息；
根据所述链路的连接信息，控制所述本端交换单元执行以下操作：
向所述链路所接入的下一级单板上的对端交换单元发送数据单元，以使所述对端交换单元在接收到所述数据单元后，将所述数据单元通过所述链路返回给所述本端交换单元；
在所述本端交换单元接收到返回的所述数据单元时，确定所述链路双向可达。
在一个示例中，在根据所述链路的连接信息，控制所述本端交换单元向所述链路所接入的下一级单板上的对端交换单元发送数据单元时，处理器10还被所述机器可执行指令促使：
根据所述链路的连接信息，创建所述数据单元的路由转发信息，其中，所述路由转发信息中指定了转发所述数据单元的每一跳的出端口；
控制所述本端交换单元执行以下操作：
对所述数据单元封装所述路由转发信息，
通过所述链路将封装后的所述数据单元发送给所述下一级单板上的对端交换单元，以使所述对端交换单元根据所述路由转发信息，将所述数据单元通过所述链路返回给所述本端交换单元。
在一个示例中，所述路由转发信息用于指示通过两跳转发所述数据，其中，第一跳的出端口为所述本端交换单元上连接所述链路的端口，第二跳的出端口为所述下一级单板上的对端交换单元上连接所述链路的端口。
在一个示例中，所述链路的连接信息中包括：所述本端交换单元的标识ID，所述本端交换单元上连接所述链路的端口的ID，所述下一级单板上的对端交换单元的ID，所述对端交换单元上连接所述链路的端口的ID。
在一个示例中，在确定所述链路双向可达时，处理器10还被所述机器可执行指令促使：
若所述本端交换单元通过所述链路接收到的数据单元的内容与发送的所述数据单元的内容相同，则确定所述链路双向可达。
在一个示例中，处理器10还被所述机器可执行指令促使：
获取所述链路的物理连接状态；
若所述链路的物理连接状态正常，则根据所述链路的连接信息，控制所述本端交换单元向所述链路所接入的下一级单板上的对端交换单元发送数据单元。
上述装置中各个单元的功能和作用的实现过程具体详见上述方法中对应步骤的实现过程，在此不再赘述。
对于装置实施例而言，由于其基本对应于方法实施例，所以相关之处参见方法实施例的 部分说明即可。以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性劳动的情况下，即可以理解并实施。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上对本公开实施例所提供的方法和装置进行了详细介绍，本文中应用了具体个例对本公开的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本公开的方法及其核心思想；同时，对于本领域的一般技术人员，依据本公开的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本公开内容不应理解为对本公开的限制。

Claims (12)

  1. 一种链路检测方法，应用于两级以上的交换网络，所述交换网络中的每一级单板包含一个以上交换单元，所述方法包括：
    针对本级单板上的每一个本端交换单元，所述单板获取所述本端交换单元上接入的链路的连接信息；
    根据所述链路的连接信息，所述单板控制所述本端交换单元执行以下操作：
    向所述链路所接入的下一级单板上的对端交换单元发送数据单元，以使所述对端交换单元在接收到所述数据单元后，将所述数据单元通过所述链路返回给所述本端交换单元；
    在所述本端交换单元接收到返回的所述数据单元时，所述单板确定所述链路双向可达。
  2. 根据权利要求1所述的方法，其中，根据所述链路的连接信息，控制所述本端交换单元向所述链路所接入的下一级单板上的对端交换单元发送数据单元，包括：
    所述单板根据所述链路的连接信息，创建所述数据单元的路由转发信息，其中，所述路由转发信息中指定了转发所述数据单元的每一跳的出端口；
    所述单板控制所述本端交换单元执行以下操作：
    对所述数据单元封装所述路由转发信息，
    通过所述链路将封装后的所述数据单元发送给所述下一级单板上的对端交换单元，以使所述对端交换单元根据所述路由转发信息，将所述数据单元通过所述链路返回给所述本端交换单元。
  3. 根据权利要求2所述的方法，其中，所述路由转发信息用于指示通过两跳转发所述数据单元，其中，第一跳的出端口为所述本端交换单元上连接所述链路的端口，第二跳的出端口为所述下一级单板上的对端交换单元上连接所述链路的端口。
  4. 根据权利要求1所述的方法，其中，所述链路的连接信息中包括：所述本端交换单元的标识ID，所述本端交换单元上连接所述链路的端口的ID，所述下一级单板上的对端交换单元的ID，所述对端交换单元上连接所述链路的端口的ID。
  5. 根据权利要求1所述的方法，其中，在所述本端交换单元接收到返回的所述数据单元时，确定所述链路双向可达，包括：
    若所述本端交换单元通过所述链路接收到的数据单元的内容与发送的所述数据单元的内容相同，则所述单板确定所述链路双向可达。
  6. 根据权利要求1所述的方法，其中，所述方法还包括：
    所述单板获取所述链路的物理连接状态；
    若所述链路的物理连接状态正常，则所述单板根据所述链路的连接信息，控制所述本端 交换单元向所述链路所接入的下一级单板上的对端交换单元发送数据单元。
  7. 一种单板，应用于两级以上的交换网络，所述交换网络中的每一级所述单板包括：
    交换单元；
    处理器；
    存储有机器可执行指令的非暂时性存储介质，
    其中，所述处理器被所述机器可执行指令促使：
    针对本级单板上的每一个本端交换单元，获取所述本端交换单元上接入的链路的连接信息；
    根据所述链路的连接信息，控制所述本端交换单元执行以下操作：
    向所述链路所接入的下一级单板上的对端交换单元发送数据单元，以使所述对端交换单元在接收到所述数据单元后，将所述数据单元通过所述链路返回给所述本端交换单元；
    在所述本端交换单元接收到返回的所述数据单元时，确定所述链路双向可达。
  8. 根据权利要求7所述的单板，其中，在根据所述链路的连接信息，控制所述本端交换单元向所述链路所接入的下一级单板上的对端交换单元发送数据单元时，所述处理器还被所述机器可执行指令促使：
    根据所述链路的连接信息，创建所述数据单元的路由转发信息，其中，所述路由转发信息中指定了转发所述数据单元的每一跳的出端口；
    控制所述本端交换单元执行以下操作：
    对所述数据单元封装所述路由转发信息，
    通过所述链路将封装后的所述数据单元发送给所述下一级单板上的对端交换单元，以使所述对端交换单元根据所述路由转发信息，将所述数据单元通过所述链路返回给所述本端交换单元。
  9. 根据权利要求8所述的单板，其中，所述路由转发信息用于指示通过两跳转发所述数据单元，其中，第一跳的出端口为所述本端交换单元上连接所述链路的端口，第二跳的出端口为所述下一级单板上的对端交换单元上连接所述链路的端口。
  10. 根据权利要求7所述的单板，其中，所述链路的连接信息中包括：所述本端交换单元的ID，所述本端交换单元上连接所述链路的端口的ID，所述下一级单板上的对端交换单元的ID，所述对端交换单元上连接所述链路的端口的ID。
  11. 根据权利要求7所述的单板，其中，在确定所述链路双向可达时，所述处理器还被所述机器可执行指令促使：
    若所述本端交换单元通过所述链路接收到的数据单元的内容与发送的所述数据单元的内 容相同，则确定所述链路双向可达。
  12. 根据权利要求7所述的单板，其中，所述处理器还被所述机器可执行指令促使：
    获取所述链路的物理连接状态；
    若所述链路的物理连接状态为正常，则根据所述链路的连接信息，控制所述本端交换单元向所述链路所接入的下一级单板上的对端交换单元发送数据单元。
PCT/CN2018/073590 2017-01-24 2018-01-22 链路检测 Ceased WO2018137578A1 (zh)

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