JP2010093397A - Transmitter, transmission method, and transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To relieve a line fault which occurs during firmware upgrade (SWDL). <P>SOLUTION: Before performing firmware upgrade, a transmitter requests the line card of an opposite side to change over a CPU, which is mounted on the line card (e.g., the second LIU 22) on the opposite side to be paired with the line card of one system, as a master CPU concerning a protection group where a CPU to be mounted on the line card (e.g., the first LIU 3) to be upgraded is set as the master CPU for initiatively performing changeover control of a redundant line constituted of an operational line and a reserved line. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transmission apparatus, a transmission method, and a transmission system.

  Today, with the expansion of demand for large-capacity data transfer, high-speed digital synchronous transmission systems are rapidly spreading. A typical digital synchronous transmission standard is SDH (Synchronous Digital Hierarchy) defined by the International Telecommunication Union (ITU-T). A representative example is SONET (Synchronous Optical Network) defined by the American Standards Committee (ANTI). Both SDH and SONET determine the configuration of the optical synchronous communication system and the function of the transmission apparatus.

  In this digital synchronous transmission system using SDH and SONET, a signal (for monitoring and maintenance operation of a transmission apparatus and a communication network) is performed on a main signal portion (payload) obtained by multiplexing digitalized main signals. Transmission processing and demultiplexing processing of a synchronous multiplexed signal (frame) to which overhead is added are executed.

  In addition, as a network configuration system in which digital synchronous transmission is performed, for example, there is a BLSR (Bidirectional Line Switched Ring) system in which transmission apparatuses are connected by a ring-shaped line that is an operation line or a protection line. A network configured by the BLSR system has a “1 + 1 APS (Automatic Protection Switch)” function (see FIGS. 20 to 23) that realizes switching control from the operation side to the backup side when a failure occurs on the operation side. There is something to adopt. In a BLSR system network adopting the “1 + 1APS” function (hereinafter referred to as “1 + 1APS / BLSR” network), by mapping the APS byte (K1 byte, K2 byte) to the overhead of the synchronous multiplexed signal, Realizes switching control to a redundant system that automatically switches the transmission path from the operation side to the backup side when a failure occurs on the operation side. 20 to 23 are diagrams showing an outline of the “1 + 1APS” function.

  Here, the outline of the switching process to the redundant system in the “1 + 1 APS / BLSR” network will be briefly described with reference to FIGS. 24 and 25. 24 and 25 are diagrams for explaining the switching process to the redundant system in the BLSR network configuration.

  In the “1 + 1 APS / BLSR” network, in a normal operation state, only one direction (either clockwise or counterclockwise) is used as an optical signal communication path. When a line failure such as a signal disconnection state (SF) or a signal degradation state (SD) occurs, switching to a path in the opposite direction (standby side) from the path used in normal operation can be performed quickly. This is what we do.

  For example, as shown in FIG. 24, in a normal operation state, in a ring network in which four optical transmission apparatuses of Node1 to Node4 are installed, an optical signal from Node4 to Node2 uses a route via Node3. Suppose that it is transmitted clockwise. Then, for example, as shown in FIG. 25, when a line failure occurs between Node 4 and Node 3, Node 3 transmits information on the failure occurrence to Node 4 via Node 2 and Node 1. The Node 4 that has received the information on the occurrence of the failure switches and transmits the optical signal for the Node 2 to the path on the side opposite to the path used so far (the backup side). Specifically, the optical signal from Node 4 reaches Node 3 via Node 1 and Node 2, and further returns Node 3 to be transmitted to Node 2.

  That is, in the “1 + 1 APS / BLSR” network, when a transmission apparatus (for example, Node 3) on the optical signal receiving side detects a line failure, the above-described APS byte is used to transmit own apparatus information to the opposite apparatus (for example, Node 4). Notice. In this way, when a failure occurs on the operation side, switching control to a redundant system that automatically switches the transmission path from the operation side to the backup side is realized within a switching time of 50 ms defined by GR253.

  By the way, a centralized CPU type (see FIG. 26) or distributed CPU type (see FIG. 27) device configuration is generally adopted as a transmission device constituting the “1 + 1 APS / BLSR” network. The distributed CPU type realizes more stable switching performance than the centralized CPU type device configuration. FIG. 26 is a diagram illustrating a configuration example of a centralized CPU type. FIG. 27 is a diagram illustrating a configuration example of a distributed CPU type.

  That is, as shown in FIG. 27, in the distributed CPU type, similarly to the centralized CPU type, a CPU unit, a WEST LIU (Line Interface Unit) and an EAST LIU having an external line interface function for the operation line and the protection line are used. Composed. Further, the CPUs are distributed and mounted on the WEST LIU and the EAST LIU, respectively. Then, the information of the APS byte is aggregated by the firmware operating in the CPU in the LIU, and communication between the firmware is performed to share the mutual information and perform switch control.

  Here, one of the redundantly configured LIUs needs to perform the switching determination with reference to the information of the APS bytes of both the operation line and the protection line. Therefore, for example, in the case where the switching determination is performed mainly by the EAST LIU, the maintenance person of the optical transmission apparatus sets the CPU unit of the EAST LIU as the master CPU. When the EAST LIU receives the setting information via the CPU firmware (user I / F unit) of the CPU unit, the EAST LIU mainly performs switching processing in hardware as the master CPU.

  In such a distributed CPU type, for example, when SF is detected as a switching factor in the hardware of the WEST LIU that is the interface of the operation line, the hardware indicates that SF has occurred in the firmware in its own CPU. Notification is performed (see (1) in FIG. 27). The WEST LIU firmware then notifies the firmware in the EAST LIU CPU (master CPU) by firmware communication (see (2) in FIG. 27). The firmware of the EAST LIU performs APS determination processing (switch determination processing) based on the switching factor (SF) received from the WEST LIU and the information of the APS byte of the EAST LIU (see (3) in FIG. 27).

  Then, the firmware of the EAST LIU sends a switching notification as a result of the APS determination process to the firmware of the WEST LIU through inter-firmware communication (see (4) in FIG. 27). The WEST LIU firmware and the EAST LIU firmware perform switching control on their own hardware based on the determination result of the EAST LIU firmware (see (5) in FIG. 27). As described above, the switching control is performed based on the determination process of the CPU of the EAST LIU functioning as the master CPU. For example, the switch switching as shown in FIG. 25 is performed.

  As a technique for sharing information between CPUs, Patent Document 1 discloses a VME bus (from a master processor unit to a VME bus (between one master unit and a plurality of slave units) between processor units composed of a CPU and a memory. A distributed multiprocessing system is disclosed in which information can be shared among CPUs by transferring data to a plurality of slave units via VERSA Module Eurocard bus).

JP-A-8-202672

  By the way, when upgrading the firmware of a transmission apparatus without stopping the above-described distributed CPU type system operation (hereinafter referred to as “SWDL”), it is not possible to repair a line failure during the upgrade. was there. That is, when SWDL is performed in the master CPU of the LIU that mainly performs the switching process in hardware, the process of the master CPU is stopped during the period from the SWDL to the completion of restoration. Therefore, when a failure occurs in the line under the master CPU, the switching process for switching the CPU from the master to the slave cannot be performed, and the line failure cannot be remedied.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and it is possible to realize the repair of a line failure that has occurred during firmware upgrade (SWDL) without stopping the system. An object of the present invention is to provide a transmission device, a transmission method, and a transmission system.

  In order to solve the above-described problems and achieve the object, the disclosed apparatus is a firmware that is mounted on a single line card among a pair of line cards that accommodate a plurality of ports and form a redundant configuration. Before the upgrade, the CPU mounted on the opposite line card that is paired with the one-line line card is transferred to the operation line and the protection line in units of a predetermined group set in advance for the plurality of ports. The switching request unit that requests the opposite line card to switch to the master CPU that performs the switching control of the configured redundant line, and the switching request unit that is requested to switch to the master CPU. As a slave CPU to which the CPU mounted on the opposite line card is subordinate, the CPU mounted on the one-line line card is switched. A switching control unit for controlling the hardware installed in the system line cards, a.

  According to the disclosed apparatus, it is possible to realize the remedy of a line failure that has occurred during firmware upgrade (SWDL) without stopping the system.

  Hereinafter, an embodiment of a transmission device, a transmission method, and a transmission system will be described in detail with reference to the accompanying drawings.

  An example of switching processing when a line failure occurs between transmission apparatuses and an example of firmware upgrade (SWDL) performed in the transmission apparatus will be briefly described with reference to FIGS. FIG. 1 and FIG. 2 are diagrams for explaining an example of a switching process performed when a line failure occurs between transmission apparatuses according to the first embodiment. 3 and 4 are diagrams for explaining an example of firmware upgrade (SWDL) performed in the transmission apparatus according to the first embodiment.

  For example, the transmission apparatus and its own apparatus and the opposite apparatus are connected by a ring-shaped redundant line including a working (work) line and a protection line (BLSR). Furthermore, as a switching control method between apparatuses when a line failure occurs, “1 + 1 APS bidirectional mode (bidirectional)” that performs line switching processing while maintaining synchronization is adopted (“1 + 1 APS / BLSR” network).

  As shown in FIG. 1 and FIG. 2, when an operation line failure occurs in the own device or the opposite device, the APS byte is led by the CPU on the master side based on the “1 + 1 APS bidirectional mode (bidirectional)”. Are exchanged between devices. In this way, the switching process from the operation line (W) to the protection line (P) is executed between the own apparatus and the transmission apparatus of the opposite apparatus.

  As shown in FIG. 3, the protection line (Protection-G) number “1” indicating the combination of port redundancy in the own apparatus is the master of the protection line CPU, and the slave is the slave of the CPU of the work line. And Then, when the own apparatus receives the SWDL request issued from the maintenance person of the transmission apparatus to the line card “LIU3” in which the group number “1” is set during the system operation, as shown in FIG. Then, SWDL processing is executed. Specifically, after deleting the old version firmware module stored in the flash memory, the new version module is written into the flash memory.

  After completion of the SWDL process, the own apparatus continues to execute the CPU Reset process and the restoration process. Specifically, after resetting the CPU, a CPU reset process for restarting the CPU is executed, and then a restoration process for restoring the device to a state before executing the SWDL process is executed.

  When executing the SWDL processing as described above, since the master CPU mounted on the first LIU 3 is stopped from the SWDL processing until the restoration processing is completed, it is assumed that a line failure occurs during the SWDL execution. Even the line failure can not be remedied. That is, for example, even if a line failure with the group number “1” is detected, the opposite device issues an APS byte requesting the opposite device to switch the line or the line failure detected on the opposite device side. The received APS cannot be received. Thus, the line switching process cannot be executed with the opposite apparatus, and the line failure cannot be relieved.

  Therefore, the transmission apparatus according to the first embodiment includes a redundant configuration in which a CPU mounted on a line card (for example, the second LIU 22) to be upgraded is configured with an operation line and a protection line before the firmware is upgraded. For a protection group that is set as a master CPU that leads and executes line switching control, the CPU mounted on the opposite line card (for example, the first LIU 3) that forms a pair with the one-line line card is used as the master CPU. To the line card on the opposite side.

  Then, the hardware mounted on the one-line line card is set so that the CPU mounted on the one-line line card is switched as the slave CPU to be followed by the CPU mounted on the opposite line card.

  For this reason, the transmission apparatus according to the first embodiment can realize line remedy for a line failure that has occurred during firmware upgrade (SWDL) without stopping the system.

[Configuration of Transmission Apparatus (Example 1)]
FIG. 5 is a diagram illustrating the configuration of the transmission apparatus according to the first embodiment. As illustrated in FIG. 1, the transmission apparatus 100 according to the first embodiment includes a CPU unit 1 and a first LIU 3 and a second LIU 22 that are a pair of redundantly configured LIUs. Hereinafter, a case where the firmware of the first LIU 3 is upgraded will be described.

  The CPU unit 1 includes a user I / F unit 2. The user I / F unit 2 receives various setting information such as “SWDL request command for upgrading the firmware of the first LIU 3” and “SWDL request command for upgrading the firmware of the second LIU 22” from the maintenance person of the transmission apparatus 100, for example. The input is accepted and transferred to the first LIU 3 and the second LIU 22.

  In addition, when the CPU unit 1 detects a CPU reset after completion of SWDL for the LIU (for example, the first LIU 3) that is a target of SWDL, the CPU unit 1 performs the upper interface (for example, the first I / F unit 5) of the LIU. The re-Prov processing request is issued. For example, when receiving the SWDL completion notification from the first LIU 3, the CPU unit 1 transmits the SWDL completion notification of the first LIU 3 to the second LIU 22 that is the opposite card of the first LIU 3.

  The first LIU 3 has firmware 4 and hardware 16. The firmware 4 is firmware that operates in the CPU mounted on the first LIU 3 and executes line switching control processing. The hardware 16 detects failure information from the line from the EAST-side port group 200 or switches the switch according to switching control from the firmware 4. The EAST side port group 200 and the WEST side port group 300 are composed of, for example, eight physical ports.

  The firmware 4 includes a first I / F unit 5, a device monitoring unit 6, a control unit 10, and an interrupt receiving unit 15.

  When the first I / F unit 5 receives the SWDL request command transferred from the user I / F unit 2, the first I / F unit 5 issues the SWDL request command of the own card (first LIU 3) to the SWDL state monitoring unit 9 described later. To do.

  The device monitoring unit 6 includes an inter-firm communication unit 7, a CPU determination unit 8, and a SWDL state monitoring unit 9. The inter-firm communication unit 7 communicates various information (for example, SWDL request command for upgrading firmware, CPU master / slave switching command, etc.) with the firmware 23 of the second LIU 22.

  When receiving the master / slave information collection request from the SWDL state monitoring unit 9, the CPU determination unit 8 collects the master / slave allocation status of the CPU of the own card from the hardware master / slave switching unit 18 of the hardware 16 to obtain the SWDL state. Notify the monitoring unit 9.

  When the CPU determination unit 8 receives a Slave setting request command for requesting switching of the CPU to the slave from the SWDL state monitoring unit 9, the setting in the hardware master / slave switching unit 18 is changed from the master to the slave for the corresponding protection group. Switch. Then, after the switching is completed, the CPU determination unit 8 notifies the SWDL state monitoring unit 9 of a hardware setting response.

  When the CPU determination unit 8 receives a Master setting request command for requesting switching of the CPU to the master from the SWDL state monitoring unit 9, the setting in the hardware master / slave switching unit 18 is changed from slave to master for the corresponding protection group. Switch. Then, after the switching is completed, the CPU determination unit 8 notifies the SWDL state monitoring unit 9 of a hardware setting response.

  When the SWDL state monitoring unit 9 receives the SWDL request command from the first I / F unit 5, the CPU mounted on its own card (first LIU 3) indicates the master / slave allocation status to the CPU determination unit 8. Send the requested Master / Slave information collection request. Then, a notification of allocation status is received from the CPU determination unit 8. Furthermore, the SWDL state monitoring unit 9 refers to the SWDL state monitoring table 17 included in the hardware 16 and confirms the SWDL state of the opposing card (second LIU 22).

  Then, the SWDL state monitoring unit 9 performs master / slave switching of the CPU of the own card based on the confirmation result of the SWDL state of the opposing card (second LIU 22) and the allocation status notified from the CPU determination unit 8. . Specifically, the SWDL state monitoring unit 9 satisfies whether or not the counter card (second LIU 22) is in a state in which SWDL is not performed and there is a protection group in which the CPU of the own card is assigned to the master CPU. Determine whether. As a result of the determination, if the above condition is satisfied, the SWDL state monitoring unit 9 uses the counter card (the first card) for the protection group in which the CPU of the own card is set as the master CPU via the inter-firm communication unit 7. A master setting request command is issued to the opposing card (second LIU 22) so that the CPU of the second LIU 22) is switched to the master CPU.

  When the SWDL state monitoring unit 9 receives a master setting response indicating completion of switching to the master for the corresponding protection group from the opposing card (second LIU 22), the SWDL state monitoring unit 9 switches the corresponding protection group to the slave. Issue the requested command.

  When the SWDL state monitoring unit 9 receives a hardware setting response indicating completion of switching to the slave from the CPU determination unit 8, the SWDL state monitoring unit 9 notifies the SWDL request to the SWDL processing plane of the own card (first LIU 3). The SWDL process Plane executes CPURST (CPU reset) after the SWDL process.

  When the SWDL state monitoring unit 9 receives the re-Prov processing request issued from the CPU unit 1 via the first I / F unit 5, the first LIU 3 executes the restoration process, and when the restoration process is completed, A SWDL completion notification is transmitted to the CPU unit 1 through the I / F unit 5. Then, the SWDL state monitoring unit 9 transmits to the CPU determination unit 8 a confirmation request as to whether or not the CPU of the own card is a slave for the protection group that has been switched first. With reference to the confirmation response received from the CPU determination unit 8, it is confirmed whether or not the CPU of the own card is a slave for the corresponding protection group.

  When it is confirmed that the CPU of the card for the corresponding protection group is a slave, the SWDL state monitoring unit 9 issues a Master setting command for requesting switching of the corresponding protection group from the slave to the master to the CPU determination unit 8. When the hardware setting response indicating completion of switching to the master is received from the CPU determination unit 8, the SWDL state monitoring unit 9 turns the CPU of the opposing card (second LIU 22) into the slave CPU for the protection group to be switched to the master CPU again. A slave setting request command is issued to the opposing card (second LIU 22) so as to be switched.

  The control unit 10 includes a switching control unit 11, a setting control reception unit 12, a trigger detection unit 13, and a hardware control unit 14. The switching control unit 11 receives the switching determination result determined by the trigger detection unit 13 and instructs the hardware 16 to perform line switching control. The setting control receiving unit 12 receives and stores the setting information transferred from the first I / F unit 5 and transfers the stored setting information to the inter-firm communication unit 7 or from the inter-firm communication unit 7. Receive and store the transferred setting information. The trigger detection unit 13 receives failure information collected by an interrupt reception unit 15 to be described later, performs switching determination, and notifies the switching control unit 11 of the switching determination result.

  The hardware control unit 14 sets, for example, “1 + 1 APS bidirectional mode (bidirectional)” or “1 + 1 APS unidirectional mode (unidirectional)” in the hardware 16 as a switching control method between apparatuses when a line failure occurs. Details will be described in a later embodiment.

  When receiving the interrupt notification from the interrupt trigger detection unit 20 described later, the interrupt reception unit 15 collects the failure information in the port set as the master CPU of the CPU of the first LIU 3 from the failure monitor unit 21 described later. For example, when the uppermost part of the EAST side port group is the first port and the first to fourth ports are set as the master CPU, the SF (signal disconnection) or SD of the first to fourth ports is set. Collect information such as (signal degradation).

  The hardware 16 includes a SWDL state monitoring table 17, a hardware master / slave switching unit 18, an inter-hardware communication unit 19, an interrupt trigger detection unit 20, and a failure monitor unit 21.

  In the SWDL state monitoring table 17, the CPU mounted on the own card (first LIU 3) is assigned to either the master CPU or the slave CPU for each protection group set in advance for the ports constituting the EAST side port group 200. To manage the allocation status.

  The failure monitor unit 21 receives and stores failure information stored in the APS byte from the EAST side port group 200. Also, the failure information received by the failure monitor unit 40 of the hardware 35 of the second LIU 22 from the west-side port group 300 is acquired from the inter-hardware communication unit 19 described later and stored.

  The inter-hardware communication unit 19 communicates the failure information acquired by each piece of hardware installed in the redundant LIU to the hardware installed in the opposite line card. That is, the inter-hardware communication unit 19 transmits the fault information stored in the fault monitor unit 21 and the interrupt notification detected by the interrupt trigger detection unit 20 described later to the inter-hardware communication unit 38 of the second LIU 22, or the second LIU 22 The failure information stored in the failure monitor unit 40 and the interrupt notification detected by the interrupt trigger detection unit 39 described later are received from the inter-hardware communication unit 38.

  Similarly to the failure monitor unit 21, the interrupt trigger detection unit 20 receives failure information stored in the APS byte from the EAST-side port group 200, detects the failure information as an interrupt notification, and sends an interrupt notification to the interrupt receiving unit 15. Send an interrupt notification. The interrupt trigger detection unit 20 transmits the detected interrupt notification to the second LIU 22 using the inter-hardware communication unit 19.

  The hardware master-slave switching unit 18 switches the setting in the hardware master-slave switching unit 18 from the master to the slave according to the CPU determination unit 8.

  The hardware 16 performs switching from the operation line to the protection line or from the protection line to the operation line in accordance with the instruction of the line switching control received from the switching control unit 10, and the light is transmitted through the operation line or the protection line. Control to receive the signal.

  As shown in FIG. 5, the second LIU 22 on the opposite side that bears the redundant configuration with the first LIU 3 has the same configuration as the first LIU 3, and the function of each component is the same as the function of each component of the first LIU 3. Since there is, detailed description is omitted. When the second LIU 22 is the target of the SWDL process, the same process as the first LIU 3 described above is executed, but when the second LIU 22 is on the opposite side of the first LIU 3 that is the target of the SWDL process, The following operations are performed.

  When receiving the SWDL request command transferred from the user I / F unit 2, the second I / F unit 24 rewrites (changes) the contents of the SWDL state monitoring table 36. Specifically, when the SWDL request command transferred from the user I / F unit 2 is received, it confirms that it is the opposite card of the first LIU 3 in the protection group (Protection-G). Then, the content of the SWDL state monitoring table 36 in the hardware 35 is rewritten from “opposite card SWDL not implemented” to “opposite card SWDL being implemented”.

  When the second I / F unit 24 receives the SWDL completion notification of the first LIU from the CPU unit 1, the content of the SWDL state monitoring table 36 is changed from “opposing card SWDL in progress” to “incoming card SWDL not executed”. Rewrite (change) again.

  When receiving the Master setting request command from the first LIU 3 via the inter-firm communication unit 26, the CPU determination unit 28 switches the setting in the hardware master / slave switching unit 37 for the corresponding protection group from the slave to the master. Then, after completion of the switching, the CPU determination unit 28 transmits a Master setting response to the first LIU 3 via the inter-firm communication unit 26.

  When the CPU determination unit 28 receives a Slave setting request command from the first LIU 3 via the inter-firm communication unit 26, the CPU determination unit 28 switches the setting in the hardware master / slave switching unit 37 from the master to the slave for the corresponding protection group. Then, after completion of the switching, the CPU determination unit 28 transmits a slave setting response to the first LIU 3 via the inter-firm communication unit 26.

[Processing by Transmission Device (Example 1)]
FIG. 6 is a diagram illustrating a configuration example of the transmission system according to the first embodiment. 7 and 8 are diagrams illustrating a process flow of the transmission apparatus according to the first embodiment.

  For example, as shown in FIG. 6, the transmission apparatus 100 as its own apparatus is connected to the opposite apparatus through a redundant line composed of a working (work) line and a protection line, thereby constituting a transmission system. In such a transmission system, for example, when upgrading the firmware installed in the first LIU 3 of the own apparatus from the maintenance person, the processing is performed according to the flow shown in FIGS. FIG. 8 shows a flow of processing that is performed continuously from the processing shown in FIG.

(Step S1)
For example, the CPU unit 1 receives an input of a “SWDL request command for upgrading the firmware of the first LIU 3” from the maintenance person of the transmission apparatus 100 and transfers the input to the first LIU 3 and the second LIU 22.

(Step S2)
When the second I / F unit 24 of the second LIU 22 receives the SWDL request command transferred from the user I / F unit 2 of the CPU unit 1, it rewrites (changes) the contents of the SWDL state monitoring table 36. Specifically, when the SWDL request command transferred from the user I / F unit 2 is received, it confirms that it is the opposite card of the first LIU 3 in the protection group (Protection-G). Then, the content of the SWDL state monitoring table 36 in the hardware 35 is rewritten from “opposite card SWDL not implemented” to “opposite card SWDL being implemented”.

(Step S3)
When the first I / F unit 5 of the first LIU 3 receives the SWDL request command transferred from the user I / F unit 2 of the CPU unit 1, the first LIU 3 sends its own card (first LIU 3) to the SWDL state monitoring unit 9. The SWDL request command is issued.

(Step S4)
When the SWDL state monitoring unit 9 receives the SWDL request command from the first I / F unit 5, the CPU mounted on its own card (first LIU 3) indicates the master / slave allocation status to the CPU determination unit 8. Send the requested Master / Slave information collection request. Then, a notification of allocation status is received from the CPU determination unit 8. From this notification, for example, in the case illustrated in FIG. 6, the SWDL state monitoring unit 9 sets “Master” for “protection group (Protection-G) = 1” and “Slave” for “protection group (Protection-G) = 2”. ”Is confirmed.

(Step S5)
Furthermore, the SWDL state monitoring unit 9 refers to the SWDL state monitoring table 17 included in the hardware 16 and confirms the SWDL state of the opposing card (second LIU 22). For example, in the case shown in FIG. 6, it is confirmed that the opposing card (second LIU 22) is in a state where SWDL is not performed. Then, the SWDL state monitoring unit 9 performs the master / slave switching determination of the CPU of the own card based on the confirmation result regarding the SWDL state of the opposing card (second LIU 22) and the allocation status notified from the CPU determination unit 8. To do.

  Specifically, the SWDL state monitoring unit 9 satisfies whether or not the counter card (second LIU 22) is in a state in which SWDL is not performed and there is a protection group in which the CPU of the own card is assigned to the master CPU. Determine whether. In the case shown in FIG. 6, since the above condition is satisfied, the SWDL state monitoring unit 9 via the inter-firm communication unit 7, the corresponding protection group in which the CPU of the own card is set as the master CPU (Protection-G = For 1), a master setting request command is issued to the opposing card (second LIU 22) so that the CPU of the opposing card (second LIU 22) is switched to the master CPU.

  When the CPU determination unit 28 of the second LIU 22 receives the Master setting request command from the first LIU 3 via the inter-firm communication unit 26, the CPU determination unit 28 in the hardware master-slave switching unit 37 for the protection group (Protection-G = 1). Change the setting from slave to master. Then, after completion of the switching, the CPU determination unit 28 transmits a Master setting response to the first LIU 3 via the inter-firm communication unit 26. The SWDL state monitoring unit 9 receives a Master setting response indicating completion of switching to the master for the corresponding protection group from the opposing card (second LIU 22).

(Step S6)
When receiving the Master setting response from the opposing card (second LIU 22), the SWDL state monitoring unit 9 issues a command requesting the CPU determination unit 8 to switch to the corresponding protection group.

  When the CPU determination unit 8 receives from the SWDL state monitoring unit 9 a command that requests the CPU to switch to the slave, the CPU determination unit 8 switches the setting in the hardware master / slave switching unit 18 from the master to the slave for the protection group. . Then, after the switching is completed, the CPU determination unit 8 notifies the SWDL state monitoring unit 9 of a hardware setting response.

(Step S7)
The SWDL state monitoring unit 9 notifies the SWDL request to the SWDL processing plane of the own card (first LIU 3). The SWDL process Plane executes CPURST (CPU reset) after the SWDL process.

(Step S8)
When the CPU unit 1 detects a CPU reset after completion of SWDL with respect to the LIU (for example, the first LIU 3) that is subject to SWDL, the CPU unit 1 re-sends it to the upper interface (for example, the first I / F unit 5) that the LIU has. Issue a Prov processing request. When the SWDL state monitoring unit 9 receives a re-Prov processing request issued from the CPU unit 1 via the first I / F unit 5, the SWDL state monitoring unit 9 executes a restoration process.

(Step S9)
When the restoration process is completed, the SWDL state monitoring unit 9 transmits a SWDL completion notification to the CPU unit 1 via the first I / F unit 5.

(Step S10)
When the CPU unit 1 receives the SWDL completion notification from the first LIU 3, the CPU unit 1 transmits the SWDL completion notification of the first LIU 3 to the second LIU 22 that is the opposite card of the first LIU 3.

(Step S11)
When the second I / F unit 24 of the second LIU 22 receives the SWDL completion notification of the first LIU 3 from the CPU unit 1, the contents of the SWDL state monitoring table 36 are changed from “opposing card SWDL being executed” to “facing card SWDL not being executed. Rewrite (change).

(Step S12)
After sending the SWDL completion notification to the CPU unit 1, the SWDL state monitoring unit 9 causes the CPU determination unit 8 to slave the CPU of its own card for the protection group (Protection-G = 1) that has been switched first. A confirmation request for whether or not is sent. With reference to the confirmation response received from the CPU determination unit 8, it is confirmed whether or not the CPU of the own card is a slave for the corresponding protection group. For example, in the case shown in FIG. 6, it is confirmed that “Slave” for “Protection Group (Protection-G) = 1” and “Slave” for “Protection Group (Protection-G) = 2”.

(Step S13)
When it is confirmed that the CPU of the own card (first LIU 3) is a slave for the corresponding protection group (Protection-G = 1), the SWDL state monitoring unit 9 requests switching of the corresponding protection group from the slave to the master. A master setting command is issued to the CPU determination unit 8. When receiving the Master setting command for requesting the CPU to switch to the slave from the SWDL state monitoring unit 9, the CPU determination unit 8 switches the setting in the hardware master / slave switching unit 18 from the slave to the master for the protection group. After completion of the switching, the CPU determination unit 8 notifies the SWDL state monitoring unit 9 of a hardware setting response. The SWDL state monitoring unit 9 receives a hardware setting response indicating completion of switching to the master from the CPU determination unit 8.

(Steps S14 and S15)
After receiving the hardware setting response indicating the completion of the switching to the master from the CPU determination unit 8, the SWDL state monitoring unit 9 again sets the counter card (the second card) for the protection group (Protection-G = 1) to be switched to the master CPU again. A Slave setting request command is issued to the opposing card (second LIU 22) so that the CPU of the LIU 22) is switched to the slave CPU. When the CPU determination unit 28 of the second LIU receives the Slave setting request command from the first LIU 3 via the inter-firm communication unit 26, the CPU unit 28 in the hardware master-slave switching unit 37 for the corresponding protection group (Protection-G = 1). Change the setting from master to slave. Then, after completion of the switching, the CPU determination unit 28 transmits a slave setting response to the first LIU 3 via the inter-firm communication unit 26. The SWDL state monitoring unit 9 of the first LIU 3 receives the Slave setting response from the second LIU via the inter-firm communication unit 7 and ends the process.

[Effects of Example 1]
As described above, according to the first embodiment, for example, the SWDL of the first LIU 3 is performed among a pair of line cards that accommodate a plurality of ports and have a redundant configuration. Before this, the CPU of the second LIU 22 is set as the master CPU for the protection group that is set as the master CPU that performs the switching control of the redundant line composed of the operation line and the protection line. Switch as Then, the hardware 16 is controlled to switch the CPU of the first LIU 3 as the slave CPU to which the master CPU of the second LIU 22 follows.

  Therefore, for example, as shown in FIG. 9, the conventional problem that a line failure cannot be relieved during SWDL is solved. That is, during SWDL, line monitoring of all protection groups can be performed with a line card (for example, the second LIU 22) on the SWDL non-implemented side. As a result, for example, as shown in FIG. 10, even if a failure occurs in the operation (work) line during SWDL, the line card on the SWDL non-implementation side can switch from the operation line to the protection line. Can be rescued. 9 and 10 are diagrams for explaining the effect of the transmission apparatus according to the first embodiment.

  FIGS. 11 and 12 are diagrams for explaining an example of firmware upgrade (SWDL) performed in the transmission apparatus according to the second embodiment.

  As shown in FIG. 11, it is conceivable to upgrade firmware (SWDL) installed in both the first LIU 3 and the second LIU 22 in the own apparatus. In this case, as shown in FIG. 12, the CPUs of the first LIU 3 and the second LIU 22 are stopped until the SWDL of the first LIU 3 and the second LIU 22 in the own apparatus is completed.

  Therefore, as shown in FIG. 13, the APS byte issued from the opposite device due to the line failure occurring in the opposite device is not received by the own device. Furthermore, when “1 + 1 APS bidirectional mode (bidirectional)” that performs line switching processing while synchronizing is adopted as a switching control method between the own apparatus and the opposite apparatus when a line failure occurs, There is no APS byte response. For this reason, the opposite device also has a problem that the line cannot be switched until the SWDL in the own device is completed and there is a response. If SWDL is executed serially, line switching in the opposite device is delayed according to the number of LIUs that execute SWDL. FIG. 13 is a diagram illustrating a problem according to the second embodiment.

  Therefore, for example, as illustrated in FIG. 14, the transmission apparatus according to the second embodiment uses “1 + 1 APS one-way mode (Unidirectional)” in which each apparatus independently performs line switching processing. That is, when upgrading each firmware installed in a pair of line cards that are installed in itself and have a redundant configuration, the transmission apparatus is set to “1 + 1 APS unidirectional mode (unidirectional)” with respect to another transmission apparatus (opposite apparatus). Request to change. FIG. 14 is a schematic diagram illustrating an example of a switching process performed when a line failure occurs between transmission apparatuses according to the second embodiment.

  In this way, even when other transmission apparatuses constituting the protection group execute SWDL, the line switching can be independently performed in the transmission apparatus in which the line failure has occurred, and the line failure can be relieved.

  When requesting the opposite device to change the line switching method of the protection group of the opposite device connected to the protection group of the own device, it can be realized by using an APS byte code. For example, as shown in FIG. 15, in the case where an empty code “011” is inserted in the area “b6” to “b8” of the payload part of the APS byte and transmitted to the opposite device, the “1 + 1 APS one-way mode ( (Unidirectional) "is specified as a request for change. On the other hand, when the empty code “010” is inserted into the APS byte and transmitted to the opposite device, it is defined that the change is requested to “1 + 1 APS bidirectional mode (bidirectional)”. FIG. 15 is a diagram illustrating a configuration example of the APS byte during the switching process according to the second embodiment.

[Processing by Transmission Device (Example 2)]
FIG. 16 is a diagram illustrating a configuration example of a transmission system according to the second embodiment. FIGS. 17 and 18 are diagrams illustrating a flow of processing performed by the transmission apparatus according to the second embodiment. In the transmission system as shown in FIG. 16, for example, when upgrading the firmware installed in the first LIU 3 and the second LIU 22 of the own apparatus, the processing is performed according to the flow as shown in FIGS. Is called. FIG. 18 shows a flow of processing that is performed continuously from the processing shown in FIG.

(Step S1)
The CPU unit 1 receives, for example, an input of a “SWDL request command for upgrading the firmware of the first LIU 3 and the second LIU 22” from the maintenance person of the transmission apparatus 100 and transfers it to the first LIU 3 and the second LIU 22. .

(Step S2)
When receiving the SWDL request command, the second I / F unit 24 of the second LIU 22 rewrites (changes) the contents of the SWDL state monitoring table 36. Then, the second I / F unit 24 of the second LIU 22 issues a SWDL request command to the SWDL state monitoring unit 27.

(Step S3)
When the SWDL state monitoring unit 27 receives the SWDL request command, the master / slave information collection request for requesting the allocation status of the master / slave of the CPU mounted on the own card (second LIU 22) to the CPU determination unit 28. Send. Then, a notification of the allocation status is received from the CPU determination unit 28. From this notification, for example, in the case shown in FIG. 16, the SWDL state monitoring unit 27 “Master” for “protection group (Protection-G) = 1” and “Slave” for “protection group (Protection-G) = 2”. ”Is confirmed.

(Step S4)
Furthermore, the SWDL state monitoring unit 27 refers to the SWDL state monitoring table 36 included in the hardware 35 and confirms the SWDL state of the opposing card (first LIU 3). For example, in the case shown in FIG. 16, it is confirmed that the opposing card (first LIU 3) is in a state in which SWDL is being performed.

(Step S5)
After the SWDL state monitoring unit 27 confirms that the opposing card (first LIU 3) is in the SWDL execution state, it confirms that the opposing card (first LIU 3) is in the SWDL execution state. Based on the allocation status notified from the CPU determination unit 28, notification determination to the hardware control unit 32 is performed.

  Specifically, the SWDL state monitoring unit 27 is configured such that the opposite card (first LIU 3) of the protection group is executing SWDL, and the CPU of the own card is the master among all the protection groups of the own card (second LIU 22). It is determined whether or not a condition that a group of CPUs exists is satisfied. In the case shown in FIG. 16, since the above condition is satisfied, the SWDL state monitoring unit 27 indicates that “protection group (Protection-G) = 1” is “Master” and both line cards (first LIU 3 and first The second LIU 22) notifies the hardware control unit 32 that SWDL is being performed.

(Step S6)
The hardware control unit 32 that has received the notification from the SWDL state monitoring unit 27 confirms the line switching mode (method), and if it is “1 + 1 APS bidirectional mode (bidirectional)”, the hardware control unit 32 Then, setting of the APS byte (see FIG. 14) for transmitting to the opposite device is executed. Specifically, the hardware control unit 32 sets the line switching mode of the protection group of the opposite device connected to “protection group (Protection-G) = 1” to “1 + 1 APS unidirectional mode (Unidirectional)”. The APS byte is set by inserting the empty code “011” into “b6” to “b8” of the payload portion of the APS byte.

  Then, the content of the APS byte set by the hardware control unit 32 is transmitted from the hardware 35 to the opposite device, so that the line switching mode of the opposite device is changed to “1 + 1 APS one-way mode (Unidirectional)”. The As a result, when both the line cards (the first LIU 3 and the second LIU 22) of the own apparatus are in SWDL and a failure occurs in the operation line on the opposite apparatus side, the opposite apparatus is set to “1 + 1 APS one-way mode (Unidirectional)”. Since it has been changed, switching to the protection line can be executed.

(Step S7)
After the notification to the hardware control unit 32, the SWDL state monitoring unit 27 notifies the SWDL request to the SWDL processing plane of the own card (second LIU 22). The SWDL process Plane executes CPURST (CPU reset) after the SWDL process.

  After receiving the SWDL request command transferred from the CPU unit 1, the first LIU 3 performs the same processing as the above-described steps S1 to S7 (steps S2 'to S7').

(Step S8, 8 ')
When the CPU unit 1 detects a CPU reset after completion of SWDL for the first LIU 3 and the second LIU 22 subject to SWDL, the upper interface (for example, the first I / F unit) of each of the first LIU 3 and the second LIU 22 is detected. 5. A re-Prov processing request is issued to the second I / F unit 24). When the SWDL state monitoring unit 9 of the first LIU 3 receives the re-Prov processing request issued from the CPU unit 1 via the first I / F unit 5, it executes a restoration process. Similarly, when the SWDL state monitoring unit 27 of the second LIU 22 receives a re-Prov processing request issued from the CPU unit 1 via the second I / F unit 24, it executes a restoration process.

(Steps S9, 9 ')
When the restoration process is completed, the SWDL state monitoring unit 9 transmits a SWDL completion notification to the CPU unit 1 via the first I / F unit 5. Similarly, the SWDL state monitoring unit 27 transmits a SWDL completion notification to the CPU unit 1 via the second I / F unit 24.

(Step S10)
When the CPU unit 1 receives the SWDL completion notification from the first LIU 3 and the second LIU 22, the CPU unit 1 transmits the SWDL completion notification of the second LIU 22 to the first LIU 3 that is the opposite card of the second LIU 22. Similarly, the SWDL completion notification of the first LIU 3 is transmitted to the second LIU 22 that is the opposite card of the first LIU 3.

(Steps S11 and 11 ′)
When the first I / F unit 5 of the first LIU 3 receives the SWDL completion notification of the second LIU from the CPU unit 1, the contents of the SWDL state monitoring table 17 are changed from “Ongoing card SWDL is being executed” to “No other card SWDL being executed. Rewrite (change). Then, the first I / F unit 5 notifies the SWDL state monitoring unit 9 of the content change in the SWDL state monitoring table 17. When the second I / F unit 24 of the second LIU 22 receives the SWDL completion notification of the first LIU 3 from the CPU unit 1, the contents of the SWDL state monitoring table 36 are changed from “opposing card SWDL being executed” to “facing card SWDL not being executed. Rewrite (change). Then, the second I / F unit 24 notifies the SWDL state monitoring unit 27 of the content change of the SWDL state monitoring table 36.

(Steps S12 and 12 ')
When the notification of the content change of the SWDL state monitoring table 17 is received, the SWDL state monitoring unit 9 requests the CPU determination unit 8 for the allocation status of the master / slave of the CPU mounted on the own card (first LIU 3). Master / Slave information collection request is transmitted. Then, a notification of allocation status is received from the CPU determination unit 8. From this notification, for example, in the case shown in FIG. 16, the SWDL state monitoring unit 9 sets “Slave” for “Protection Group (Protection-G) = 1” and “Master” for “Protection Group (Protection-G) = 2”. ”Is confirmed.

  Similarly, when the notification of the content change in the SWDL state monitoring table 36 is received, the SWDL state monitoring unit 27 assigns the master / slave of the CPU mounted on the own card (second LIU 22) to the CPU determination unit 28. A Master / Slave information collection request for requesting a situation is transmitted. Then, a notification of the allocation status is received from the CPU determination unit 28. For example, in the case illustrated in FIG. 16, the SWDL state monitoring unit 27 is “Master” for “protection group (Protection-G) = 1” and “Slave” for “protection group (Protection-G) = 2”. Confirm.

(Steps S13 and 13 ')
The SWDL state monitoring unit 9 notifies the hardware control unit 14 that the SWDL has been completed and that “Master Group” (Protection-G) = 2 is “Master”. Similarly, the SWDL state monitoring unit 27 notifies the hardware control unit 32 that the SWDL has been completed and that “protection group (Protection-G) = 1” is “Master”.

(Steps S14, 14 ')
The hardware control unit 14 that has received the notification from the SWDL state monitoring unit 9 sets the line switching mode of the opposite device connected to “protection group (Protection-G) = 2” to the hardware 16 as “1 + 1APS bidirectional”. The setting of the APS byte is executed by inserting an empty code “010” in “b6” to “b8” of the payload portion of the APS byte so that the mode (Bidirectional) is obtained. Set the APS byte.

  Similarly, the hardware control unit 32 that has received the notification from the SWDL state monitoring unit 27 sets the line switching mode of the opposing device connected to “protection group (Protection-G) = 1” to the hardware 35. The APS byte is set by inserting an empty code “010” in “b6” to “b8” of the payload portion of the APS byte so that the “1 + 1 APS bidirectional mode (bidirectional)” is obtained. Set the APS byte.

  Then, the contents of the APS byte set by the hardware control unit 14 and the hardware control unit 32 are transmitted from the hardware 15 and the hardware 35 to the opposite device. As a result, the line switching mode of the opposite device connected to “protection group (Protection-G) = 1” and “protection group (Protection-G) = 2” is changed to “1 + 1 APS one-way mode (Unidirectional)”. The

[Effects of Example 2]
As described above, according to the second embodiment, when upgrading each firmware installed in a pair of line cards that are installed in itself and have a redundant configuration, the other transmission apparatus (opposite apparatus) is compared. Request to change to “1 + 1 APS one-way mode (Unidirectional)”. In this way, for example, as shown in FIG. 19, even if the own device constituting the protection group is executing SWDL, line switching is performed independently in the opposite device in which the line failure has occurred. Can remedy the line trouble. FIG. 19 is a diagram for explaining the effect of the transmission apparatus according to the second embodiment.

  Another embodiment of the transmission apparatus will be described.

(1) Device Configuration, etc. Each component of the transmission device 100 shown in FIG. 5 is functionally conceptual and does not necessarily need to be physically configured as illustrated. That is, the specific form of distribution / integration of the transmission apparatus 100 is not limited to that shown in the figure. For example, all or part of the CPU determination unit 8 and the SWDL state monitoring unit 9 of the first LIU 3 are integrated. It can be configured to be functionally or physically distributed / integrated in arbitrary units according to various loads or usage conditions. Furthermore, each processing function (see FIGS. 7, 8, 17, and 18) performed in the transmission apparatus 100 is entirely or arbitrarily part of a CPU and a program that is analyzed and executed by the CPU. It can be realized or can be realized as hardware by wired logic.

(2) Transmission Method The following transmission method is realized by the transmission apparatus 100 described in the above embodiment.

  In other words, among the pair of line cards that accommodate multiple ports and have a redundant configuration, before upgrading the firmware that is mounted on the line card that forms a single system, it is mounted on the line card to be upgraded. The one-system line card for a predetermined group in which the plurality of ports are grouped, wherein the CPU is set as a master CPU that leads and executes switching control of a redundant line composed of an operation line and a protection line. A switching request step for requesting the opposite-side line card to switch the CPU mounted on the opposite-side line card paired with the master CPU (see, for example, step S5 in FIG. 7), and the switching request. CPU mounted on the opposite-side line card requested to switch to the master CPU in the step As minor slave CPU, and a switching control step of controlling so as to switch the CPU that is mounted on a line card of the piece system (e.g., see step S6 in FIG. 7), the transmission method including the are realized.

  The following supplementary notes are further disclosed with respect to the embodiments including the above examples.

(Supplementary note 1) Before upgrading the firmware installed in one line card among a pair of line cards that accommodate multiple ports and have a redundant configuration, the line card to be upgraded For the predetermined group in which the plurality of ports set as a master CPU that is set as a master CPU that performs the switching control of the redundant line composed of the operation line and the standby line is installed, the one-system A switching request unit that requests the opposite line card to switch the CPU mounted on the opposite line card that is paired with the line card as the master CPU;
Switching for controlling the CPU mounted on the one-line line card to be switched as the slave CPU to which the CPU mounted on the opposite line card requested to switch to the master CPU by the switching request unit A control unit;
A transmission apparatus.

(Additional remark 2) The command receiving part which receives the command regarding the upgrade request | requirement of a firmware from the maintenance person of the said transmission apparatus,
An allocation status management unit for managing an allocation status indicating whether the CPU mounted on each line card is allocated to the master CPU or the slave CPU in the predetermined group unit;
An upgrade execution status monitoring unit for monitoring an upgrade execution status indicating whether or not the firmware upgrade is being executed in the hardware mounted on the opposite-side line card;
Further comprising
When the command is received by the command receiving unit, the switching request unit determines that the firmware upgrade is not being executed from the upgrade status monitored by the upgrade execution status monitoring unit, and the allocation status management The transmission apparatus according to appendix 1, wherein the opposite line card is requested to switch to the master CPU on the condition that it is determined that the assignment as the master CPU exists from the assignment status managed by the management unit.

(Supplementary note 3) In order to perform switching control from the operation line to the protection line by transmitting an optical signal of the SDH / SONET method when a failure occurs in the operation line, the ring-shaped redundant line is provided. When the switching control method between other transmission devices connected to the system is set to the synchronous switching method and each firmware installed in a pair of line cards installed in the redundant configuration is executed, The transmission apparatus according to appendix 1, further comprising a switching method change request unit that requests the other transmission apparatus to change to the asynchronous switching method.

(Appendix 4) Before upgrading the firmware installed in a line card that forms a single system among a pair of line cards that accommodate multiple ports and form a redundant configuration, For the predetermined group in which the plurality of ports set as a master CPU that is set as a master CPU that performs the switching control of the redundant line composed of the operation line and the standby line is installed, the one-system A switching request step for requesting the opposing line card to switch the CPU mounted on the opposing line card that is paired with the line card as the master CPU;
Switching for controlling to switch the CPU mounted on the one-line line card as the slave CPU to be followed by the CPU mounted on the opposite line card requested to switch to the master CPU in the switching request step Control steps;
Including transmission method.

(Appendix 5) Before upgrading the firmware installed in a line card that forms a single system among a pair of line cards that accommodate a plurality of ports and have a redundant configuration, For the predetermined group in which the plurality of ports set as a master CPU that is set as a master CPU that performs the switching control of the redundant line composed of the operation line and the standby line is installed, the one-system A switching request unit that requests the opposite line card to switch the CPU mounted on the opposite line card that is paired with the line card as the master CPU;
Switching for controlling the CPU mounted on the one-line line card to be switched as the slave CPU to which the CPU mounted on the opposite line card requested to switch to the master CPU by the switching request unit A control unit;
Is connected between the transmission devices having the ring-like redundancy line, and when the failure of the operation line occurs, the switching control from the operation line to the protection line is performed between the transmission devices by transmitting the SDH / SONET optical signal. A transmission system realized in

(Supplementary note 6) In order to control switching from the operation line to the protection line by transmitting an SDH / SONET optical signal when a failure occurs in the operation line, a ring-shaped redundancy consisting of the operation line and the protection line is performed. When the switching control method with other transmission devices connected by a line is set to the synchronous switching method, and when upgrading each firmware installed in a pair of line cards that are installed in itself and have a redundant configuration A transmission apparatus having a switching method change requesting unit that requests the other transmission apparatus to change to an asynchronous switching method.

FIG. 6 is a diagram for explaining an example of a switching process performed when a line failure occurs between the transmission apparatuses according to the first embodiment. FIG. 6 is a diagram for explaining an example of a switching process performed when a line failure occurs between the transmission apparatuses according to the first embodiment. 6 is a diagram for explaining an example of firmware upgrade (SWDL) performed in the transmission apparatus according to the first embodiment; FIG. 6 is a diagram for explaining an example of firmware upgrade (SWDL) performed in the transmission apparatus according to the first embodiment; FIG. 1 is a diagram illustrating a configuration of a transmission apparatus according to a first embodiment. 1 is a diagram illustrating a configuration example of a transmission system according to Embodiment 1. FIG. FIG. 3 is a diagram illustrating a processing flow of the transmission apparatus according to the first embodiment. FIG. 3 is a diagram illustrating a processing flow of the transmission apparatus according to the first embodiment. FIG. 6 is a diagram for explaining an effect of the transmission apparatus according to the first embodiment. FIG. 6 is a diagram for explaining an effect of the transmission apparatus according to the first embodiment. FIG. 10 is a diagram for explaining an example of firmware upgrade (SWDL) performed in the transmission apparatus according to the second embodiment. FIG. 10 is a diagram for explaining an example of firmware upgrade (SWDL) performed in the transmission apparatus according to the second embodiment. FIG. 6 is a diagram illustrating a problem according to a second embodiment. FIG. 10 is a diagram for explaining an example of a switching process performed when a line failure occurs between transmission apparatuses according to the second embodiment. It is a figure which shows the structure of the APS byte at the time of the switching process which concerns on Example 2. FIG. FIG. 10 is a diagram illustrating a configuration example of a transmission system according to a second embodiment. FIG. 10 is a diagram illustrating a processing flow of the transmission apparatus according to the second embodiment. FIG. 10 is a diagram illustrating a processing flow of the transmission apparatus according to the second embodiment. FIG. 10 is a diagram for explaining an effect of the transmission apparatus according to the second embodiment. It is a figure which shows the outline | summary of a "1 + 1APS" function. It is a figure which shows the outline | summary of a "1 + 1APS" function. It is a figure which shows the outline | summary of a "1 + 1APS" function. It is a figure which shows the outline | summary of a "1 + 1APS" function. It is a figure for demonstrating the switching process to the redundant system in the network structure of BLSR. It is a figure for demonstrating the switching process to the redundant system in the network structure of BLSR. It is a figure which shows the structural example of a centralized CPU type | mold. It is a figure which shows the structural example of a distributed CPU type | mold.

Explanation of symbols

1 CPU
2 User I / F part 3 First LIU
DESCRIPTION OF SYMBOLS 4 Firmware 5 1st I / F part 6 Device monitoring part 7 Inter-firmware communication part 8 CPU determination part 9 SWDL state monitoring part 10 Control part 11 Switching control part 12 Setting control receiving part 13 Trigger detection part 14 Hardware control part 15 Interrupt Reception unit 16 Hardware 17 SWDL state monitoring table 18 Hardware master / slave switching unit 19 Inter-hardware communication unit 20 Interrupt trigger detection unit 21 Fault monitor unit 22 Second LIU
23 Firmware 24 First I / F unit 25 Device monitoring unit 26 Inter-firmware communication unit 27 SWDL state monitoring unit 28 CPU determination unit 29 Control unit 30 Setting control reception unit 31 Switching control unit 32 Hardware control unit 33 Trigger detection unit 34 Interrupt Reception unit 35 Hardware 36 SWDL state monitoring table 37 Hardware master-slave switching unit 38 Inter-hardware communication unit 39 Interrupt trigger detection unit 40 Fault monitor unit

Claims (5)

Among the pair of line cards that accommodate multiple ports and have a redundant configuration, the CPU mounted on the line card to be upgraded before upgrading the firmware mounted on the single line card However, with respect to a predetermined group in which the plurality of ports set as a master CPU for leading and executing switching control of a redundant line composed of an operation line and a protection line is paired with the one-line line card. A switching request unit that requests the opposing line card to switch the CPU mounted on the opposing line card that constitutes the master CPU;
Switching for controlling the CPU mounted on the one-line line card to be switched as the slave CPU to which the CPU mounted on the opposite line card requested to switch to the master CPU by the switching request unit A control unit;
A transmission apparatus. A command receiving unit for receiving a command regarding a firmware upgrade request from a maintenance person of the transmission device;
An allocation status management unit for managing an allocation status indicating whether the CPU mounted on each line card is allocated to the master CPU or the slave CPU in the predetermined group unit;
An upgrade execution status monitoring unit for monitoring an upgrade execution status indicating whether or not the firmware upgrade is being executed in the hardware mounted on the opposite-side line card;
Further comprising
When the command is received by the command receiving unit, the switching request unit determines that the firmware upgrade is not being executed from the upgrade status monitored by the upgrade execution status monitoring unit, and the allocation status management The transmission apparatus according to claim 1, wherein a request for switching to the master CPU is made to the opposite-side line card on condition that it is determined that there is an assignment as the master CPU based on an assignment state managed by a section.   In order to perform switching control from the operation line to the protection line by transmitting an SDH / SONET optical signal when an operation line failure occurs, the ring-shaped redundant line is connected. When the switching control method with another transmission apparatus is set to the synchronous switching method, and upgrade of each firmware installed in a pair of line cards that are installed in itself and have a redundant configuration is performed, the other transmission The transmission device according to claim 1, further comprising a switching method change request unit that requests the device to change to an asynchronous switching method. Among the pair of line cards that accommodate multiple ports and have a redundant configuration, the CPU mounted on the line card to be upgraded before upgrading the firmware mounted on the single line card However, with respect to a predetermined group in which the plurality of ports set as a master CPU for leading and executing switching control of a redundant line composed of an operation line and a protection line is paired with the one-line line card. A switching request step for requesting the opposite-side line card to switch the CPU mounted on the opposite-side line card as the master CPU;
Switching for controlling to switch the CPU mounted on the one-line line card as the slave CPU to be followed by the CPU mounted on the opposite line card requested to switch to the master CPU in the switching request step Control steps;
Including transmission method. Among the pair of line cards that accommodate multiple ports and have a redundant configuration, the CPU mounted on the line card to be upgraded before upgrading the firmware mounted on the single line card However, with respect to a predetermined group in which the plurality of ports set as a master CPU for leading and executing switching control of a redundant line composed of an operation line and a protection line is paired with the one-line line card. A switching request unit that requests the opposing line card to switch the CPU mounted on the opposing line card that constitutes the master CPU;
Switching for controlling the CPU mounted on the one-line line card to be switched as the slave CPU to which the CPU mounted on the opposite line card requested to switch to the master CPU by the switching request unit A control unit;
Is connected between the transmission devices having the ring-like redundancy line, and when the failure of the operation line occurs, the switching control from the operation line to the protection line is performed between the transmission devices by transmitting the SDH / SONET optical signal. A transmission system realized in

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