CN115802211A - Automatic association method and device for network logical link - Google Patents
Automatic association method and device for network logical link Download PDFInfo
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Abstract
The invention relates to a method and a device for automatically associating network logical links, wherein the method comprises the following steps: acquiring ARP configuration information on all BNG/SR equipment, and processing the ARP configuration information to obtain an ARP configuration information list; acquiring a local OLT equipment information table, and associating the MAC address in the ARP configuration information list with the OLT network management IP address in the local OLT equipment information table to obtain a first OLT-BNG/SR equipment link table; acquiring OLT network management configuration information on all BNG/SR equipment, and processing the OLT network management configuration information to obtain an OLT network management configuration information list; and querying the OLT network management configuration information list according to the virtual gateway address in the OLT network management configuration information list to obtain a static OLT-BNG/SR equipment link, and completing the first OLT-BNG/SR equipment link list by using the static OLT-BNG/SR equipment link to obtain a second OLT-BNG/SR equipment link list.
Description
Technical Field
The invention relates to the field of network management service support in the communication industry, in particular to a method and a device for automatically associating network logical links.
Background
At present, the way for operation and maintenance personnel to obtain the link information of the OLT-BNG/SR device is mainly to manually search the link information of the OLT-BNG/SR networking device through localized form account information, and then redistribute or select service information on an old link according to the requirement of new addition or old usage. The manual lookup OLT-BNG/SR link process is as follows:
1. the localized table ledger searches BNG/SR master-slave device names, device IP and corresponding network pipe interface information; 2. manually logging in BNG/SR equipment, and inputting a network management subinterface configuration file instruction for inquiring BNG/SR; 3. manually calculating the range of the OLT IP according to the gateway network segment configured in the network management subinterface configuration file; 4. and according to the calculated OLT IP, comparing with the localized table ledger, and determining that the OLT obtains an OLT-BNG/SR equipment link.
In the prior art, the OLT-BNG/SR link is obtained by manually logging in the BNG/SR device and analyzing and calculating the OLT IP by querying the gateway network segment configured by the network management sub-interface, which mainly has the following disadvantages:
1. the process is complicated, consumes manpower, and service distribution time is long:
due to the fact that the network is changed, the equipment is subjected to cutting, transferring, offline, version upgrading and networking transformation, and whether the service chain needs to be identified or not is manually searched, the manual association searching process is complex, and a large amount of manpower is consumed. The manual searching efficiency is low, and the service distribution time is long.
2. Manual search, accuracy cannot be guaranteed:
the manually searched service association algorithm is unreasonable, and the static configuration information on the BNG/SR may cause the query range to be enlarged due to the engineering state or configuration maintenance, and the like, so that it is not guaranteed that the service chain information on the network is accurately queried.
Disclosure of Invention
The invention aims to provide a method and a device for automatically associating network logical links, aiming at solving the defects in the prior art. The ARP table is a real-time on-network information cache table on the BNG/SR device, and records the IP address information, MAC address information, logic port information and the like of the OLT network management which is normally interconnected on the current BNG/SR device in real time. The invention utilizes the characteristic of the ARP table and combines the configuration information of BNG/SR equipment to carry out service abstract analysis and induction, thereby realizing the automatic association of the metropolitan area network equipment link based on the ARP table.
In a first aspect, a method for automatically associating network logical links is provided, including:
acquiring ARP configuration information on a plurality of BNG/SR devices, and processing the ARP configuration information to obtain an ARP configuration information list, wherein the ARP configuration information list at least comprises an identifier of each BNG/SR device and a corresponding MAC address thereof, and the MAC address is an OLT network management IP address of an OLT device connected with the BNG/SR device;
acquiring a local OLT device information table, and associating the MAC address of each BNG/SR device in the ARP configuration information list with the OLT network management IP address in the local OLT device information table to obtain a first OLT-BNG/SR device link table;
acquiring OLT network management configuration information on a plurality of BNG/SR devices, and processing the OLT network management configuration information to obtain an OLT network management configuration information list, wherein the OLT network management configuration information list at least comprises an identifier of each BNG/SR device and a virtual gateway address corresponding to the identifier, and the virtual gateway addresses correspond to the OLT devices connected with the BNG/SR devices one to one;
inquiring in the OLT network management configuration information list according to the virtual gateway address in the OLT network management configuration information list to obtain a static OLT-BNG/SR equipment link, and completing the first OLT-BNG/SR equipment link list by using the static OLT-BNG/SR equipment link to obtain a second OLT-BNG/SR equipment link list;
the BNG represents a broadband network gateway, the SR represents a full service router, the ARP represents an address resolution protocol, the OLT represents a fiber line terminal, and the OLT-BNG/SR device link table records BNG/SR devices connected to each OLT device.
In a possible implementation, after obtaining the second OLT-BNG/SR device link table, the method further includes:
and filtering the second OLT-BNG/SR equipment link list to obtain a third OLT-BNG/SR equipment link list.
In a possible implementation, the processing the ARP configuration information to obtain an ARP configuration information list includes:
extracting the ARP configuration information to obtain ARP effective configuration information, wherein the ARP effective configuration information at least comprises an equipment name, an equipment IP, an MAC address, an address type and a network management subinterface;
and screening the ARP effective configuration information, and reserving the data with the address type being the network management address to obtain an ARP configuration information list.
In one possible implementation, before the extracting the ARP configuration information, the method further includes:
and compressing the ARP configuration information by using a compression algorithm based on an Apache Kafka framework.
In a possible implementation manner, the processing the OLT network management configuration information to obtain an OLT network management configuration information list includes:
and extracting the OLT network management configuration information to obtain an OLT network management configuration information list, wherein the OLT network management configuration information list at least comprises an equipment name, an equipment IP, a network management address, a virtual gateway address and a network management sub-interface.
In a possible implementation manner, before the extracting the OLT network management configuration information, the method further includes:
and based on an Apache Kafka framework, compressing the OLT network management configuration information by using a compression algorithm.
In a possible implementation manner, the method for obtaining the virtual gateway address in the OLT network management configuration information list includes:
and carrying out correlation analysis on the BNG device IP and the network management subinterface information in the first OLT-BNG/SR device link list and the BNG device IP and the network management subinterface in the OLT network management configuration information list to obtain a virtual gateway address in the OLT network management configuration information list.
In one possible embodiment, the filtering operation includes:
and removing the equipment with the equipment state of engineering state and offline state in the second OLT-BNG/SR equipment link table.
In one possible implementation, the compression algorithm is an LZ4 compression algorithm.
In a second aspect, an apparatus for automatically associating network logical links is provided, including:
the system comprises an ARP processing unit, a first network management unit and a second network management unit, wherein the ARP processing unit is configured to acquire ARP configuration information on a plurality of BNG/SR devices and process the ARP configuration information to obtain an ARP configuration information list, the ARP configuration information list at least comprises an identifier of each BNG/SR device and a corresponding MAC address, and the MAC address is an OLT network management IP address of an OLT device connected with the BNG/SR device; the association unit is configured to acquire a local OLT equipment information table, associate the MAC address of each BNG/SR equipment in the ARP configuration information table with the OLT network management IP address in the local OLT equipment information table, and obtain a first OLT-BNG/SR equipment link table; the OLT processing unit is configured to acquire OLT network management configuration information on a plurality of BNG/SR devices, process the OLT network management configuration information and acquire an OLT network management configuration information list, wherein the OLT network management configuration information list at least comprises an identifier of each BNG/SR device and a virtual gateway address corresponding to the identifier, and the virtual gateway address corresponds to the OLT device connected with the BNG/SR device one by one; a completion unit configured to query the OLT network management configuration information list according to the virtual gateway address in the OLT network management configuration information list to obtain a static OLT-BNG/SR device link, and complete the first OLT-BNG/SR device link table by using the static OLT-BNG/SR device link to obtain a second OLT-BNG/SR device link table; the BNG represents a broadband network gateway, the SR represents a full service router, the ARP represents an address resolution protocol, the OLT represents a fiber line terminal, and the OLT-BNG/SR device link table records BNG/SR devices connected to each OLT device.
The invention provides a method and a device for automatically associating a network logical link, which utilize the characteristic that an ARP routing table reflects the network service condition of a network in real time, realize the method and the device for automatically associating the ARP table with the metropolitan area network equipment configuration information to obtain an OLT-BNG/SR equipment link, replace the low-efficiency mode of manually identifying and maintaining the equipment link at present, greatly improve the efficiency and reduce the labor cost. And the ARP table reflects the service on-line condition of the network in real time, so the technical scheme of the invention can theoretically ensure that the link association of the OLT-BNG/SR equipment reaches 100 percent of accuracy.
Drawings
FIG. 1 is a schematic diagram of a conventional OLT-BNG/SR networking architecture of a metropolitan area network;
fig. 2 is a flowchart of a method for automatically associating network logical links according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating ARP configuration information processing according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a process of performing association operation on ARP configuration information and an OLT apparatus information table according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of processing configuration information of an OLT according to an embodiment of the present disclosure;
FIG. 6 is a schematic flow chart of analyzing and completing an OLT-BNG/SR device link according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an automatic association apparatus for network logical links according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Before describing the embodiments of the present application in detail, the terms and symbols used in the embodiments of the present application will be explained.
OLT: optical Line Terminal, refers to a Terminal device for connecting an Optical fiber trunk.
SR: service Router, full Service Router, used to terminate and manage PPPoE/IPoE session of user.
BNG: broadband Network Gateway, IP edge node are collectively called BNG, BRAS (Broadband Remote Access Server) and SR all belong to the representation form of BNG, which is mainly used for user and service control, including address assignment.
CR: core Router, the Core Router, is a Router that forwards packets to computer hosts in the network. In the internet, are routers located at the core of the network, primarily for routing and forwarding data packets, typically with greater throughput.
ARP table: the ARP is an Address Resolution Protocol, is a real-time on-network information cache table on the BNG/SR device, and records the IP Address information, the MAC Address information, the logic port information and the like of the OLT network management network which is normally interconnected on the current BNG/SR device in real time.
Apache Kafka: apache Kafka is a distributed data stream processing platform, and can publish, subscribe, store and process data streams in real time.
OLT-BNG/SR equipment link list: the BNG/SR device to which each OLT device is connected is recorded.
For the convenience of understanding of the embodiments of the present invention, the following description will be further explained with reference to specific embodiments, which are not to be construed as limiting the embodiments of the present invention.
The OLT-BNG/SR conventional networking structure of the metropolitan area network comprises the following steps: OLT-BNG/SR single-up networking and OLT-BNG/SR double-up networking. The structure of the device link networking is shown in fig. 1. In the OLT-BNG/SR single-uplink networking, one OLT device is connected with one BNG/SR device; in the OLT-BNG/SR dual-upstream networking, one OLT device is connected with two BNG/SR devices.
In order to solve the problems that the efficiency of manual correlation query of a special line service link of the metropolitan area network is low, the accuracy cannot be guaranteed and the like, the invention provides a characteristic that an ARP table is recorded in a network information cache table in real time, correlation analysis is carried out by combining OLT network management configuration information of BNG/SR equipment, a service logic algorithm for automatically correlating the metropolitan area network equipment link based on the ARP table is established, the automatic correlation of the metropolitan area network equipment link is realized, and accurate and complete link information is obtained.
Fig. 2 is a flowchart of a method for automatically associating network logical links according to an embodiment of the present invention. As shown in fig. 2, the method at least comprises the following steps:
First, in step 201, ARP configuration information on all BNG/SR devices is obtained, and the ARP configuration information is processed to obtain an ARP configuration information list. The ARP configuration information list at least comprises the identifier of each BNG/SR device and the MAC address corresponding to the identifier, wherein the MAC address is the OLT network management IP address of the OLT device connected with the BNG/SR device.
Specifically, the production end compresses and transmits the ARP configuration information by using a compression algorithm based on an Apache Kafka framework. Preferably, the compression algorithm uses an LZ4 compression algorithm.
After receiving the compressed ARP configuration information, the consumption end decompresses the compressed ARP configuration information by using a decompression algorithm corresponding to the compression algorithm. And then, extracting the ARP configuration information acquired by each BNG/SR to obtain ARP effective configuration information, wherein the ARP effective configuration information at least comprises an equipment name, an equipment IP, an MAC address, an address type and a network management sub-interface. And screening the ARP effective configuration information, and reserving the data with the address type being the network management address to obtain an ARP configuration information list. The flow chart of step 201 may be as shown in fig. 3.
Through the data processing in step 201, a list of ARP configuration information of all BNG/SR devices can be obtained.
Then, in step 202, a local OLT equipment information table is obtained, and the MAC address in the ARP configuration information list and the OLT network management IP address in the local OLT equipment information table are correlated to obtain a real-time online OLT-BNG/SR link table. Wherein the real-time online OLT-BNG/SR link table may be expressed as a first OLT-BNG/SR device link table.
And after the ARP configuration information is compressed, gathered and cleaned, wherein the MAC address is the OLT network management IP address connected with the BNG/SR equipment in a downstream mode, and is called OLT IP for short. And associating the MAC address with an OLT IP of an OLT equipment information table managed in a local resource database to obtain the current real-time online OLT-BNG/SR equipment link information of the managed OLT equipment. The flow chart of step 202 may be as shown in fig. 4.
Thereafter, in step 203, the OLT network management configuration information on all the BNG/SR devices is obtained, and the OLT network management configuration information is processed to obtain an OLT network management configuration information list. The OLT network management configuration information list at least comprises an identifier of each BNG/SR device and a virtual gateway address corresponding to the identifier, and the virtual gateway addresses correspond to the OLT devices connected with the BNG/SR devices one by one.
Specifically, the production end compresses the OLT network management configuration information by using a compression algorithm based on an Apache Kafka framework. Preferably, the compression algorithm uses an LZ4 compression algorithm.
After receiving the compressed OLT network management configuration information, the consumer firstly decompresses the compressed OLT network management configuration information by using a decompression algorithm corresponding to the compression algorithm. And then, extracting the OLT network management configuration information to obtain an OLT network management configuration information list, wherein the OLT network management configuration information list at least comprises an equipment name, an equipment IP, a network management address, a virtual gateway address and a network management sub-interface. The flow chart of step 203 may be as shown in fig. 5.
The OLT network management configuration information is static configuration on the BNG/SR equipment, although the OLT network management address information under the BNG/SR is recorded, the real OLT-BNG/SR equipment link condition cannot be reflected in real time due to the static characteristic of the OLT network management configuration information. The ARP configuration information list is equipment information fed back on the network in real time, can truly and accurately feed back the normal operation condition of the current OLT-BNG/SR equipment link, but has the problem brought by real-time online. For example, if the device is disconnected, the real-time online OLT-BNG/SR device link obtained by the association analysis may be missed. Therefore, a further correlation analysis is performed on the OLT-BNG/SR device link in combination with the static OLT gateway configuration information on the BNG/SR device, as described in step 204.
In step 204, according to the virtual gateway address in the OLT network management configuration information list, querying in the OLT network management configuration information list to obtain a static OLT-BNG/SR device link, and completing the first OLT-BNG/SR device link table by using the static OLT-BNG/SR device link to obtain a second OLT-BNG/SR device link table. Wherein the completed OLT-BNG/SR device link table may be expressed as a second OLT-BNG/SR device link table.
Specifically, the BNG device IP and the network management subinterface information in the first OLT-BNG/SR device link table and the BNG device IP and the network management subinterface in the OLT network management configuration information list are subjected to association analysis to obtain the virtual gateway address in the OLT network management configuration information list.
Since the virtual gateway address is unique and in the OLT-BNG/SR device link, the virtual gateway address is in a one-to-one relationship with the OLT. Then, according to the virtual gateway address, querying in the OLT network management configuration information list to obtain a static OLT-BNG/SR device link, and completing the first OLT-BNG/SR device link table by using the static OLT-BNG/SR device link to obtain a second OLT-BNG/SR device link table. A schematic flow chart of step 204 may be shown in fig. 6.
Due to factors such as service expansion, equipment version upgrading, equipment fault migration and the like, engineering operations such as new network access, cut-over migration and the like of BNG/SR equipment exist, so that the condition that 3 or 4 BNG/SRs are connected to one OLT in the OLT-BNG/SR equipment link occurs.
Thus, in some possible embodiments, after step 204, the method further includes step 205 of performing a filtering operation on the second OLT-BNG/SR device link table to obtain a filtered OLT-BNG/SR device link table. Wherein the filtered OLT-BNG/SR device link table may be expressed as a third OLT-BNG/SR device link table. In some embodiments, the device with the device status of engineering status and offline status in the second OLT-BNG/SR device link table is removed.
Fig. 7 is a schematic structural diagram of an automatic association apparatus for network logical links according to an embodiment of the present invention. The apparatus 700 comprises:
an ARP processing unit 701 configured to obtain ARP configuration information on a plurality of BNG/SR devices, process the ARP configuration information to obtain an ARP configuration information list, where the ARP configuration information list at least includes an identifier of each BNG/SR device and a MAC address corresponding to the identifier, and the MAC address is a network management IP address of an OLT device connected to the BNG/SR device;
an association unit 702 configured to acquire a local OLT equipment information table, associate the MAC address of each BNG/SR equipment in the ARP configuration information list with the OLT network management IP address in the local OLT equipment information table, and obtain a first OLT-BNG/SR equipment link table;
an OLT processing unit 703 configured to obtain OLT network management configuration information on a plurality of BNG/SR devices, process the OLT network management configuration information to obtain an OLT network management configuration information list, where the OLT network management configuration information list at least includes an identifier of each BNG/SR device and a virtual gateway address corresponding to the identifier, and the virtual gateway addresses are in one-to-one correspondence with the OLT devices connected to the BNG/SR devices;
a completion unit 704 configured to query the OLT network management configuration information list according to the virtual gateway address in the OLT network management configuration information list to obtain a static OLT-BNG/SR device link, and complete the first OLT-BNG/SR device link table by using the static OLT-BNG/SR device link to obtain a second OLT-BNG/SR device link table;
the BNG represents a broadband network gateway, the SR represents a full service router, the ARP represents an address resolution protocol, the OLT represents a fiber line terminal, and the OLT-BNG/SR device link table records BNG/SR devices connected to each OLT device.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for automatically associating network logical links is characterized by comprising the following steps:
acquiring ARP configuration information on a plurality of BNG/SR devices, and processing the ARP configuration information to obtain an ARP configuration information list, wherein the ARP configuration information list at least comprises an identifier of each BNG/SR device and a corresponding MAC address thereof, and the MAC address is an OLT network management IP address of an OLT device connected with the BNG/SR device;
acquiring a local OLT device information table, and associating the MAC address of each BNG/SR device in the ARP configuration information list with the OLT network management IP address in the local OLT device information table to obtain a first OLT-BNG/SR device link table;
acquiring OLT network management configuration information on a plurality of BNG/SR devices, and processing the OLT network management configuration information to obtain an OLT network management configuration information list, wherein the OLT network management configuration information list at least comprises an identifier of each BNG/SR device and a virtual gateway address corresponding to the identifier, and the virtual gateway addresses correspond to the OLT devices connected with the BNG/SR devices one to one;
inquiring in the OLT network management configuration information list according to the virtual gateway address in the OLT network management configuration information list to obtain a static OLT-BNG/SR equipment link, and completing the first OLT-BNG/SR equipment link list by using the static OLT-BNG/SR equipment link to obtain a second OLT-BNG/SR equipment link list;
the BNG represents a broadband network gateway, the SR represents a full service router, the ARP represents an address resolution protocol, the OLT represents a fiber line terminal, and the OLT-BNG/SR device link table records BNG/SR devices connected to each OLT device.
2. The method according to claim 1, wherein after said obtaining the second OLT-BNG/SR device link table, the method further comprises:
and filtering the second OLT-BNG/SR equipment link list to obtain a third OLT-BNG/SR equipment link list.
3. The method of claim 1, wherein the processing the ARP configuration information to obtain an ARP configuration information list comprises:
extracting the ARP configuration information to obtain ARP effective configuration information, wherein the ARP effective configuration information at least comprises an equipment name, an equipment IP, an MAC address, an address type and a network management subinterface;
and screening the ARP effective configuration information, and reserving the data with the address type being the network management address to obtain an ARP configuration information list.
4. The method of claim 3, wherein prior to said extracting the ARP configuration information, the method further comprises:
and compressing the ARP configuration information by using a compression algorithm based on an Apache Kafka framework.
5. The method of claim 1, wherein the processing the OLT network management configuration information to obtain an OLT network management configuration information list comprises:
and extracting the OLT network management configuration information to obtain an OLT network management configuration information list, wherein the OLT network management configuration information list at least comprises an equipment name, an equipment IP, a network management address, a virtual gateway address and a network management sub-interface.
6. The method according to claim 5, wherein before said extracting said OLT network management configuration information, said method further comprises:
and based on an Apache Kafka framework, compressing the OLT network management configuration information by using a compression algorithm.
7. The method according to claim 1, wherein the method for obtaining the virtual gateway address in the OLT network management configuration information list comprises:
and carrying out correlation analysis on the BNG device IP and the network management subinterface information in the first OLT-BNG/SR device link list and the BNG device IP and the network management subinterface in the OLT network management configuration information list to obtain a virtual gateway address in the OLT network management configuration information list.
8. The method of claim 2, wherein the filtering operation comprises:
and removing the equipment with the equipment state of engineering state and offline state in the second OLT-BNG/SR equipment link table.
9. Method according to claim 4 or 6, characterized in that the compression algorithm is an LZ4 compression algorithm.
10. An apparatus for automatically associating network logical links, comprising:
the system comprises an ARP processing unit, a network management unit and a management unit, wherein the ARP processing unit is configured to acquire ARP configuration information on a plurality of BNG/SR devices, process the ARP configuration information and acquire an ARP configuration information list, the ARP configuration information list at least comprises an identifier of each BNG/SR device and a corresponding MAC address, and the MAC address is an OLT network management IP address of an OLT device connected with the BNG/SR device;
the association unit is configured to acquire a local OLT equipment information table, associate the MAC address of each BNG/SR equipment in the ARP configuration information table with the OLT network management IP address in the local OLT equipment information table, and obtain a first OLT-BNG/SR equipment link table;
the OLT processing unit is configured to acquire OLT network management configuration information on a plurality of BNG/SR devices, process the OLT network management configuration information and acquire an OLT network management configuration information list, wherein the OLT network management configuration information list at least comprises an identifier of each BNG/SR device and a virtual gateway address corresponding to the identifier, and the virtual gateway address corresponds to the OLT device connected with the BNG/SR device one by one;
a completion unit, configured to query in the OLT network management configuration information list according to the virtual gateway address in the OLT network management configuration information list to obtain a static OLT-BNG/SR device link, and complete the first OLT-BNG/SR device link table by using the static OLT-BNG/SR device link to obtain a second OLT-BNG/SR device link table;
the BNG represents a broadband network gateway, the SR represents a full service router, the ARP represents an address resolution protocol, the OLT represents a fiber line terminal, and the OLT-BNG/SR device link table records BNG/SR devices connected to each OLT device.
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