JP7775761B2 - COMMUNICATION SYSTEM, MANAGEMENT SERVER, AND PROCESSING METHOD - Google Patents

Description

One aspect of the present invention relates to a communication system, a management server, and a management method.

Traditionally, services such as FTTH (Fiber to the Home) have used PON (Passive Optical Network) systems, in which an optical signal is split into multiple parts so that multiple users can share a single optical fiber (see, for example, Patent Document 1). In a PON system, for example, an OLT (Optical Line Terminal) is used as the station-side device and an ONU (Optical Network Unit) is used as the home-side device, and an optical coupler that multiplexes and splits optical signals is installed between the OLT and the ONUs, allowing multiple ONUs to be connected to a single OLT.

JP 2012-257280 A

Some telecommunications carriers may have previously operated a communications service network other than a PON system (for example, a coaxial service network) and are now migrating to FTTH and switching to a PON system. Such a migration requires replacing the home equipment in the subscriber's premises, making it difficult to carry out all at once. Therefore, during the migration phase, the original communications service network system and the PON system may temporarily be operated together.

In the mixed operation described above, telecommunications carriers desire to centrally perform provisioning in the two mixed systems using a DHCP (Dynamic Host Configuration Protocol) server and a TFTP (Trivial File Transfer Protocol) server in a communication service network other than the PON system that they have traditionally operated. However, no method has been proposed for performing provisioning in a PON system using a DHCP server and a TFTP server in another communication service network.

One aspect of the present invention was made in consideration of the above-mentioned situation, and aims to enable appropriate provisioning in both communication systems when multiple communication systems are operated together, using the DHCP server and TFTP server of one of the communication systems.

A communications system according to one aspect of the present invention comprises a first system having a first management server that manages a first optical line device, and a second system having a second management server that manages a second optical line device. The first management server has a first DHCP server and a TFTP server. The second management server generates policy information that defines the correspondence between MAC addresses and configuration files for optical line devices connected to the second optical line device via optical cables. The first management server updates the information in the first DHCP server based on the policy information, and the second management server transmits a configuration file corresponding to the policy information to the TFTP server of the first management server.

A management server according to one aspect of the present invention manages optical line terminals and is configured to be able to communicate with an external server having a DHCP server and a TFTP server. The management server generates policy information that defines the correspondence between MAC addresses and configuration files for optical line terminals connected to the optical line terminal via optical cables, sends a notification to the external server that the policy information has changed so that the DHCP server information can be updated according to the policy information, and sends a configuration file according to the policy information to the external server's TFTP server.

A processing method according to one aspect of the present invention includes a first step of generating policy information that defines the correspondence between MAC addresses and configuration files for optical network devices connected to an optical line device via an optical fiber cable; a second step of sending a notification to an external server that the policy information has been changed so that the information on the external server's DHCP server can be updated in accordance with the policy information; and a third step of sending a configuration file corresponding to the policy information to the external server's TFTP server.

According to one aspect of the present invention, when multiple communication systems are operated together, provisioning can be performed appropriately in both communication systems using the DHCP server and TFTP server of one of the communication systems.

FIG. 1 is a configuration diagram of a communication system according to an embodiment. FIG. 2 is a diagram illustrating a first example of a process performed by the communication system. FIG. 3 is a diagram illustrating an example of a transfer file in which policy information has been converted. FIG. 4 is a diagram illustrating a second example of the process performed by the communication system. FIG. 5 is a diagram illustrating a third example of the process performed by the communication system. FIG. 6 is a sequence diagram showing the details of the processing of the first example. FIG. 7 is a sequence diagram showing details of the processing of the second example. FIG. 8 is a sequence diagram showing details of the processing of the third example.

[Description of the embodiment of the present invention]
First, an embodiment of the present invention will be described. A communication system according to one aspect of the present invention includes a first system having a first management server that manages a first optical line device, and a second system having a second management server that manages a second optical line device, wherein the first management server has a first DHCP server and a TFTP server, the second management server generates policy information that defines a correspondence between MAC addresses and configuration files for optical line devices connected to the second optical line device via an optical fiber cable, the first management server updates the information in the first DHCP server based on the policy information, and the second management server transmits a configuration file according to the policy information to the TFTP server of the first management server.

In a communication system according to one aspect of the present invention, information about the first DHCP server of the first management server included in the first system is updated based on policy information for the optical network device of the second system, generated by the second management server. Also, in a communication system according to one aspect of the present invention, a configuration file corresponding to the policy information is sent from the second management server to the TFTP server of the first management server. In this way, information about the first DHCP server of the first management server of the first system is updated based on policy information for the optical network device of the second system, and the configuration file is sent to the TFTP server of the first management server, thereby enabling provisioning for the second system to be performed in the first management server. In other words, in a communication system according to one aspect of the present invention, when multiple communication systems are operated together, provisioning in both communication systems can be appropriately performed using the DHCP server and TFTP server of one of the communication systems.

The second management server converts the generated policy information into a transfer file usable by the first DHCP server and sends the transfer file to the first management server. It may also send a notification to the first management server that the policy information has changed. The first management server may then use the notification as a trigger to update the information on the first DHCP server based on the transfer file. In this way, by converting the policy information into a transfer file usable by the first DHCP server and notifying the first management server that the policy information has changed, provisioning related to the second system can be performed reliably and at the appropriate time by the first management server.

The second management server has a second DHCP server, which updates the information on the second DHCP server based on the generated policy information and then sends a notification to the first management server that the policy information has changed. The first management server may then use the notification as a trigger to read the information on the second DHCP server and update the information on the first DHCP server. In this way, the DHCP server on the second management server is updated, and the information on the first DHCP server is updated by reading that information, thereby ensuring information synchronization between the DHCP servers on the first and second management servers.

The second management server may send a notification to the first management server that the policy information has changed, including the generated policy information, and the first management server may then use the notification as a trigger to update the information on the first DHCP server based on the policy information included in the notification. In this way, by including the generated policy information in the notification that the policy information has changed, it is possible to update the information on the first DHCP server with the minimum amount of communication required.

A management server according to one aspect of the present invention manages optical line terminals and is configured to be able to communicate with an external server having a DHCP server and a TFTP server. The management server generates policy information that defines the correspondence between MAC addresses and configuration files for optical line terminals connected to the optical line terminal via optical cables, sends a notification to the external server that the policy information has changed so that the DHCP server information can be updated according to the policy information, and sends a configuration file according to the policy information to the external server's TFTP server. Such a management server enables appropriate provisioning on the external server.

A processing method according to one aspect of the present invention includes a first step of generating policy information that defines the correspondence between MAC addresses and configuration files for optical network devices connected to an optical line device via an optical fiber cable; a second step of sending a notification to an external server that the policy information has been changed so that the information on the external server's DHCP server can be updated according to the policy information; and a third step of sending a configuration file according to the policy information to the external server's TFTP server. This processing method enables appropriate provisioning on the external server.

[Details of the embodiment of the present invention]
A specific example of a communication system according to an embodiment of the present invention will be described below with reference to the drawings. In the description, the same elements or elements having the same functions will be denoted by the same reference numerals, and duplicated descriptions will be omitted.

Figure 1 is a configuration diagram of a communication system 1 according to this embodiment. Communication system 1 is operated by a provider such as a CATV (Community Antenna Television) provider. Communication system 1 includes two network systems. Specifically, communication system 1 includes a DOCSIS system 10 (first system) and a PON system 20 (second system). This embodiment assumes a case in which a conventional DOCSIS system 10 is in operation in communication system 1, and the DOCSIS system 10 is to be switched to a PON system 20 to provide a new FTTH (Fiber to the Home) service. Such a system migration requires replacing the home-site equipment in the subscriber's premises, making it difficult to implement all at once. Therefore, communication system 1 temporarily operates a mixture of the existing DOCSIS system 10 and the newly introduced PON system 20.

DOCSIS system 10 is a network system conforming to DOCSIS (Data Over Cable Service Interface Specifications), a standard for high-speed data communication using CATV lines (coaxial networks). DOCSIS system 10 operates a DOCSIS network known as a CATV LAN. DOCSIS system 10 includes a DOCSIS server 11, an external server 12 (first management server), a switch 13, a CMTS 14 (first central office device), a cable modem 15, an eMTA 16, and a subscriber management system 50. As shown in FIG. 1, DOCSIS server 11, external server 12, and CMTS 14 are located, for example, in a CATV operator's center. Furthermore, cable modem 15 and eMTA 16 are located, for example, in each subscriber's home.

The cable modem 15 is a terminal installed in a subscriber's home to receive Internet services from a CATV provider. The eMTA (Embedded Multimedia Terminal Adapter) 16 is a terminal installed in a subscriber's home to receive telephone services from a CATV provider. The CMTS (cable modem termination system) 14 is a central office device that interfaces with the cable modem 15 in each subscriber's home. The switch 13 is a relay device between the DOCSIS server 11 and external server 12 and the CMTS 14. The switch 13 is also connected to a switch 22 of the PON system 20, which will be described later.

The DOCSIS server 11 is a server provided separately from the CMTS 14, etc., and manages information about each component included in the DOCSIS system 10 and controls each component. The DOCSIS server 11 performs various controls in accordance with operations by the CATV operator. The external server 12 manages the IP addresses of the cable modem 15 and eMTA 16, as well as configuration files related to IP address settings. The external server 12 includes a DHCP server 121 (first DHCP server) and a TFTP server 122. The DHCP server 121 and the TFTP server 122 are servers related to provisioning in the DOCSIS system 10. In this embodiment, the DHCP server 121 and the TFTP server 122 are servers related to provisioning not only for the DOCSIS system 10 but also for the PON system 20 (details will be described later). The DOCSIS server 11 and the external server 12 may be separate entities or may be integrated. The subscriber management system 50 is a system that centrally manages information about subscribers of the DOCSIS system 10 and the PON system 20.

PON system 20 is a network system that provides FTTH (Fiber to the Home) services by splitting an optical signal into multiple branches and sharing a single optical fiber among multiple users. As shown in FIG. 1, PON system 20 comprises multiple ONUs 24 (network units) that are home-side devices, an OLT 23 (second line-side device) that is an optical line-side device, a management server 21 (second management server) that manages OLT 23, and a switch 22. OLT 23 and the multiple ONUs 24 are connected to each other by optical cables via the FTTH network.

As shown in FIG. 1, the management server 21 and OLT 23 are installed, for example, in a CATV provider's center. Furthermore, multiple ONUs 24 are installed, for example, in each subscriber's home. Terminals such as telephones and PCs can be connected to the ONUs 24 via a Home Gateway (HGW). The switch 22 is a relay device between the management server 21 and the OLT 23. The switch 22 is also connected to the switch 13 of the DOCSIS system 10.

The management server 21 is a server provided separately from the OLT 23, and manages information about each component included in the PON system 20 and controls each component. The management server 21 has a database 230, a DHCP server 211 (second DHCP server), a TFTP server 212, a batch file 240, a Web GUI 250, and a group of applications 260.

The database 230 holds a management list that records information about each component included in the PON system 20. For example, the management list manages information such as ONU identification information, OLT identification information, distance information, time information, model identification, optical power (light intensity), and ONU status in association with one another. This information is managed for each ONU 24. The ONU identification information is information that uniquely identifies the ONU 24, such as a MAC address. The OLT identification information is information that uniquely identifies the OLT 23 to which the ONU 24 specified by the ONU identification information is connected, such as a MAC address. The distance information is the RTT (Round-Trip Time) value between the OLT 23 and the ONU 24. The time information is information indicating the date and time when the distance information was acquired. The model identification is the model code of the ONU 24. The optical power is information indicating the upstream light reception level (light intensity) from the ONU 24. ONU status is information that indicates whether the ONU 24 is online and capable of data communication, or offline.

When multiple systems are operating together, as in this embodiment, there is a desire from the telecommunications carrier to centrally perform provisioning on the two systems using the DHCP server 121 and TFTP server 122 of the system that has been operating traditionally (here, DOCSIS system 10). Below, we will explain first to third examples of implementations in which provisioning on DOCSIS system 10 and PON system 20 is performed using the DHCP server 121 and TFTP server 122 of DOCSIS system 10.

Figure 2 is a diagram illustrating a first example of the provisioning process performed by the communication system 1. As shown in Figure 2, in the first example, in the management server 21, the main processing unit 300, which has an application group 260 and the like, further includes a DB-DHCP conversion processing unit 310 (details will be described later). Also, in the first example, the external server 12 is provided with a file storage unit 150 for storing transfer files (details will be described later).

In the first example, when the information for an ONU 24 is updated in the management server 21, the policy information defining the correspondence between the MAC address and the configuration file for that ONU 24 is updated, the policy information is converted into a transfer file that can be processed by the DHCP server 121, and the transfer file is stored in the file storage unit 150 of the external server 12. The DHCP server 121 then updates the information based on the transfer file described above. The configuration file is also transferred from the management server 21 to the TFTP server 122 of the external server 12. Through the above processing, it becomes possible to perform provisioning related to the PON system 20 using the DHCP server 121 and TFTP server 122 of the external server 12. The processing will be explained in more detail below.

In the first example, the application group 260 of the main processing unit 300 first obtains information from the management list in the database 230 and extracts information about ONUs 24 whose information has been updated (newly registered ONUs 24 or ONUs 24 whose information has been changed or deleted). The application group 260 then updates (generates) policy information that defines the correspondence between MAC addresses and configuration files for the ONUs 24 whose information has been updated. The DB-DHCP conversion processing unit 310 of the main processing unit 300 then converts the policy information into a transfer file that can be used by the DHCP server 121.

Figure 3 shows an example of a transfer file (DHCP text) in which policy information has been converted into a format usable by the DHCP server 121. In the example shown in Figure 3, "Flag," "dhcp_identifier," and "dhcp4_boot_file_name" are linked together. "Flag" is information that indicates, for example, whether an ONU 24 has been added: 0 or deleted: 1. "dhcp_identifier" is information that indicates the MAC address of the ONU 24. "dhcp4_boot_file_name" is information that indicates the config file name.

Then, the application group 260 notifies the external server 12 via SNMP (Simple Network Management Protocol) that the information in the database 230 has been updated and that the policy information has been updated (by issuing a trap via SNMP). This ensures information synchronization between the management server 21 and the external server 12. The application group 260 may also notify the external server 12 of a Syslog. Furthermore, the DB-DHCP conversion processing unit 310 sends the above-mentioned converted transfer file to the external server 12 and stores the transfer file in the file storage unit 150 of the external server 12.

The external server 12 uses the above-mentioned SNMP as a trigger to update the information on the DHCP server 121 based on the transfer file in the file storage unit 150. For example, the external server 12 may update the information on the DHCP server 121 only for ONUs 24 that have been updated (ONUs 24 whose "Flag" in the transfer file is 0 or 1).

Furthermore, the application group 260 creates a new configuration file based on the updated policy information and sends the configuration file to the TFTP server 122. Through the processing up to this point, it becomes possible to perform provisioning related to the PON system 20 using the DHCP server 121 and TFTP server 122 of the external server 12.

Figure 4 is a diagram illustrating a second example of the provisioning process performed by the communication system 1. As shown in Figure 4, in the second example, when information about an ONU 24 is updated in the management server 21, policy information defining the correspondence between the MAC address and the configuration file for that ONU 24 is updated (generated), and the database 270 of the DHCP server 211 of the management server 21 is updated based on the policy information. The DHCP server 121 of the external server 12 then reads the database 270 of the DHCP server 211 using an SQL command, updating the information in the DHCP server 121. The configuration file is also transferred from the management server 21 to the TFTP server 122 of the external server 12. Through the above process, provisioning related to the PON system 20 can be performed using the DHCP server 121 and TFTP server 122 of the external server 12. The process is described in more detail below.

In the second example, as in the first example, the application group 260 first updates (generates) policy information that defines the correspondence between MAC addresses and configuration files for the ONU 24 whose information has been updated. Then, the application group 260 updates the database 270 of the DHCP server 211 based on the policy information. Then, as in the first example, the application group 260 notifies the external server 12 via SNMP and Syslog that the information in the database 230 has been updated and the policy information has been updated.

The DHCP server 121 of the external server 12 uses the above-mentioned SNMP as a trigger to directly read information from the DHCP server 211 using an SQL command (i.e., updated policy information). Furthermore, the application group 260 generates a configuration file based on the policy information and sends the configuration file to the TFTP server 122. Through the processing up to this point, provisioning related to the PON system 20 can be performed using the DHCP server 121 and TFTP server 122 of the external server 12.

Figure 5 is a diagram illustrating a third example of the provisioning process performed by the communication system 1. As shown in Figure 5, in the third example, when information about an ONU 24 is updated in the management server 21, policy information defining the correspondence between the MAC address and the configuration file for that ONU 24 is updated (generated), and an SNMP containing the policy information is notified to the external server 12. Then, the DHCP server 121 of the external server 12 updates its information based on the policy information contained in the SNMP. The configuration file is also transferred from the management server 21 to the TFTP server 122 of the external server 12. Through the above process, provisioning related to the PON system 20 can be performed using the DHCP server 121 and TFTP server 122 of the external server 12. The process is described in more detail below.

In the third example, as in the first and second examples, the application group 260 first updates (generates) policy information that defines the correspondence between MAC addresses and configuration files for the ONU 24 whose information has been updated. The application group 260 then notifies the external server 12 of an SNMP message (information indicating that the policy information has been changed) that includes the updated policy information. The main processing unit 300 may also notify the external server 12 of a Syslog.

The DHCP server 121 of the external server 12 is triggered by the above-mentioned SNMP and updates its information based on the policy information contained in the SNMP. Furthermore, the application group 260 generates a configuration file based on the policy information and sends the configuration file to the TFTP server 122. Through the processing up to this point, provisioning related to the PON system 20 can be performed using the DHCP server 121 and TFTP server 122 of the external server 12.

Next, we will explain the processing for each of the first to third examples described above, with reference to Figures 6 to 8.

Figure 6 is a sequence diagram showing the details of the processing in the first example. As shown in Figure 6, when information about an ONU 24 is updated (registered, changed, or deleted) in the database 230 of the management server 21, that information is extracted by the application group 260 (step S1). Then, based on the extracted information, the application group 260 updates (generates) policy information (step S2, first process), and the DB-DHCP conversion processing unit 310 converts the policy information into a transfer file that can be used by the DHCP server 121 (step S3).

Then, the application group 260 notifies the external server 12 via Syslog (step S4) indicating that the policy information has been changed, and also notifies the external server 12 via SNMP (step S5, second process).

Furthermore, the DB-DHCP conversion processing unit 310 stores the converted transfer file described above in the file storage unit 150 of the external server 12 (step S6). Then, in the external server 12, the information on the DHCP server 121 is updated based on the transfer file in the file storage unit 150, triggered by the above-mentioned SNMP (step S7).

In addition, the application group 260 creates a new configuration file based on the updated policy information (step S8), and transfers the configuration file to the TFTP server 122 (step S9). This completes the processing of the first example.

Figure 7 is a sequence diagram showing the details of the processing in the second example. As shown in Figure 7, when information about an ONU 24 is updated (registered, changed, or deleted) in the database 230 of the management server 21, that information is extracted by the application group 260 (step S101). Then, based on the extracted information, the application group 260 updates the policy information, and further, the database 270 of the DHCP server 211 of the management server 21 is updated based on the policy information (step S102).

Then, the application group 260 notifies the external server 12 via Syslog (step S103) indicating that the policy information has been changed, and also notifies the external server 12 via SNMP (step S104).

Next, the DHCP server 121 of the external server 12 directly reads the information of the DHCP server 211 (i.e., the updated policy information) using an SQL command triggered by the above-mentioned SNMP (step S105).

In addition, the application group 260 creates a new configuration file based on the updated policy information (step S106), and transfers the configuration file to the TFTP server 122 (step S107, third process). This completes the processing of the second example.

Figure 8 is a sequence diagram showing the details of the processing in the third example. As shown in Figure 8, when information about an ONU 24 in the database 230 of the management server 21 is updated (registered, changed, or deleted), that information is extracted by the application group 260 (step S201). Then, based on the extracted information, the application group 260 updates the policy information (step S202).

Then, the application group 260 notifies the external server 12 of the Syslog containing the updated policy information (step S203), and the DHCP server 121 of the external server 12 updates its information based on the policy information (step S204). The application group 260 also notifies the external server 12 of the SNMP containing the updated policy information (step S205), and the DHCP server 121 of the external server 12 updates its information based on the policy information (step S206).

In addition, the application group 260 creates a new configuration file based on the updated policy information (step S207), and transfers the configuration file to the TFTP server 122 (step S208). This completes the processing of the third example.

Next, we will explain the effects of the communication system 1 according to this embodiment.

The communication system 1 according to this embodiment comprises a DOCSIS system 10 having an external server 12 that manages a CMTS 14, and a PON system 20 having a management server 21 that manages an OLT 23. The external server 12 has a DHCP server 121 and a TFTP server 122. The management server 21 generates policy information that defines the correspondence between MAC addresses and configuration files for ONUs 24 connected to the OLT 23 via optical cables. The external server 12 updates the information in the DHCP server 121 based on the policy information, and the management server 21 transmits a configuration file corresponding to the policy information to the TFTP server 122 of the external server 12.

In the communication system 1 according to this embodiment, information in the DHCP server 121 of the external server 12 included in the DOCSIS system 10 is updated based on policy information for the ONU 24 generated by the management server 21. Furthermore, in the communication system 1 according to this embodiment, a configuration file corresponding to the policy information is sent from the management server 21 to the TFTP server 122 of the external server 12. In this way, information in the DHCP server 121 of the external server 12 of the DOCSIS system 10 is updated based on policy information related to the ONU 24, and the configuration file is sent to the TFTP server 122 of the external server 12, thereby enabling provisioning related to the PON system 20 to be performed in the external server 12. In other words, according to the communication system 1 according to this embodiment, when multiple communication systems are operated together, provisioning in both communication systems can be appropriately performed using the DHCP server and TFTP server of one of the communication systems.

The management server 21 converts the generated policy information into a transfer file that can be used by the DHCP server 121 and sends the transfer file to the external server 12. It also sends a notification to the external server 12 that the policy information has changed. The external server 12 may then use the notification as a trigger to update the information on the DHCP server 121 based on the transfer file. In this way, by converting the policy information into a transfer file that can be used by the DHCP server 121 and notifying the external server 12 that the policy information has changed, provisioning related to the PON system 20 can be performed reliably and at the appropriate time by the external server 12.

The management server 21 has a DHCP server 211, and the management server 21 updates the information on the DHCP server 211 based on the generated policy information and then sends a notification to the external server 12 that the policy information has changed. The external server 12 may then use the notification as a trigger to read the information on the DHCP server 211 and update the information on the DHCP server 121. In this way, the DHCP server 211 on the management server 21 is updated, and the information on the DHCP server 121 is updated by reading that information, thereby ensuring information synchronization between the DHCP servers on the external server 12 and the management server 21.

The management server 21 may send a notification to the external server 12 that the policy information has changed, including the generated policy information. The external server 12 may then use the notification as a trigger to update the information on the DHCP server 121 based on the policy information included in the notification. In this way, by including the generated policy information in the notification that the policy information has changed, it is possible to update the information on the DHCP server 121 with the minimum amount of communication required.

The above describes a communication system according to this embodiment, but the present invention is not limited to this and various modifications can be applied. Furthermore, the embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims, not by the meaning described above, and is intended to include all modifications within the meaning and scope of the claims.

1...Communication system, 10...DOCSIS system (first system), 12...External server (first management server), 14...CMTS (first optical line terminal), 20...PON system (second system), 21...Management server (second management server), 121...DHCP server (first DHCP server), 122...TFTP server, 211...DHCP server (second DHCP server).

Claims (6)

a first system having a first management server that manages a first optical line terminal;
a second system having a second management server that manages the second optical line terminal;
the first management server includes a first DHCP server and a TFTP server;
the second management server generates policy information that defines a correspondence relationship between a MAC address and a configuration file for an optical network unit connected to the second optical line device via an optical cable;
The first management server updates information of the first DHCP server based on the policy information;
The second management server transmits a configuration file corresponding to the policy information to the TFTP server of the first management server. the second management server converts the generated policy information into a transfer file that can be used by the first DHCP server, transmits the transfer file to the first management server, and further transmits a notification to the first management server that the policy information has been changed;
2. The communication system according to claim 1, wherein said first management server updates the information of said first DHCP server based on said transfer file, using said notification as a trigger. the second management server includes a second DHCP server;
The second management server updates the information of the second DHCP server based on the generated policy information, and further transmits a notification to the first management server that the policy information has been changed;
2. The communication system according to claim 1, wherein said first management server reads information of said second DHCP server and updates information of said first DHCP server, using said notification as a trigger. the second management server transmits to the first management server a notification that policy information has been changed, the notification including the generated policy information;
2. The communication system according to claim 1, wherein said first management server updates the information of said first DHCP server based on said policy information included in said notification, using said notification as a trigger. A management server configured to manage a line terminal and to be able to communicate with an external server having a DHCP server and a TFTP server,
generating policy information that defines a correspondence relationship between a MAC address and a configuration file for an optical network device connected to the optical line terminal via an optical cable;
sending a notification to the external server that the policy information has been changed so that the DHCP server can update its information according to the policy information;
The management server transmits a configuration file corresponding to the policy information to a TFTP server of the external server. A processing method performed by a management server that manages a line terminal and is configured to be able to communicate with an external server having a DHCP server and a TFTP server, comprising:
a first step of generating policy information that defines a correspondence relationship between a MAC address and a configuration file for an optical network device connected to the optical line device via an optical cable;
a second step of sending a notification to the external server that the policy information has been changed so that the external server can update its DHCP server information according to the policy information;
a third step of transmitting a configuration file corresponding to the policy information to a TFTP server of the external server.