CN104038420A - Routing computation method and equipment - Google Patents
Routing computation method and equipment Download PDFInfo
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- CN104038420A CN104038420A CN201410248044.6A CN201410248044A CN104038420A CN 104038420 A CN104038420 A CN 104038420A CN 201410248044 A CN201410248044 A CN 201410248044A CN 104038420 A CN104038420 A CN 104038420A
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Abstract
The invention discloses a routing computation method and equipment. The method comprises the following steps: a controller transmits an LSR (Link State Request) message to network equipment, receives an LSU (Link State Update) message returned by the network equipment, and stores a received LSA (Link State Advertisement) in an LSDB (Link State Database); the controller computes a shortest path tree for the network equipment on the basis of the LSA recorded in the LSDB, computes a route corresponding to the network equipment by using the shortest path tree, and informs the network equipment of the route corresponding to the network equipment. By adopting the routing computation method, the storage space of the LSDB of the network equipment is saved, and CPU (Central Processing Unit) resources of the network equipment are saved.
Description
Technical field
The present invention relates to communication technical field, especially relate to a kind of route computing method and equipment.
Background technology
OSPF (Open Shortest Path First, Open Shortest Path First) agreement is a dynamic routing protocol based on Link State, its basic ideas are as follows: in autonomous system, the network equipment (as router) of each operation ospf protocol is collected Link State separately (as interface/adjacency information etc.), and to flood LSA (the Link State Advertisement of the link-state information that carries present networks equipment of other network equipment, LSA), and receive the LSA that other network equipment floods, the LSA receiving is stored into LSDB (the Link State Database of present networks equipment, LSD) in.
Based on above-mentioned processing, each network equipment, by safeguarding identical LSDB, records identical LSA in the LSDB safeguarding on each network equipment.Further, based on the LSDB of present networks plant maintenance, each network equipment can pass through SPF (Shortest Path First, SPF) algorithm calculates a shortest path tree taking present networks equipment as root, thereby utilize this shortest path tree to calculate present networks equipment to arrive the best route of internal system other network equipment, and according to this best route transmission flow.
In above-mentioned implementation, all-network equipment all can be safeguarded LSDB, and in LSDB, needs the LSA that comprises all-network equipment, thereby causes the waste of the memory space of LSDB.Further, in the time that the LSA of the network equipment is a lot, also can cause LSDB cannot store the LSA of all-network equipment, then cause the LSDB of each network equipment maintenance different, and finally cause route mistake in computation.
Summary of the invention
The embodiment of the present invention provides a kind of route computing method and equipment, to avoid all recording the LSA of all-network equipment in the LSDB of all-network equipment, thereby can save the memory space of LSDB.
In order to achieve the above object, the embodiment of the present invention provides a kind of route computing method, the method is applied to and comprises controller and the network equipment Open Shortest Path First in ospf network, said method comprising the steps of: described controller sends the Link State request link state request packet for request link state advertisement LSA to the described network equipment, and receive the link state update link state update packet of the LSA that has carried the described network equipment that the described network equipment returns, and the LSA receiving is stored in LSD LSDB; Based on the LSA recording in described LSDB, described controller is that described network device computes goes out the shortest path tree taking the described network equipment as root, and utilize described shortest path tree to calculate the route that the described network equipment is corresponding, and the route corresponding described network equipment is notified to the described network equipment.
Described controller sends for before asking the link state request packet of LSA to the described network equipment, described method also comprises: described controller receives the first database description Data Description (DD) packet from the described network equipment, has carried the summary info of the LSA in the local LSDB of the described network equipment in described the first Data Description (DD) packet; Described controller, receiving after described the first Data Description (DD) packet, returns to the second Data Description (DD) packet to the described network equipment, does not carry the summary info of the LSA in the local LSDB of described controller in described the second Data Description (DD) packet.
Before described controller receives the first database description Data Description (DD) packet from the described network equipment, described method also comprises: described controller receives the first hello packet from the described network equipment, the Route Distinguisher information of having carried the described network equipment in described the first hello packet; Described controller, receiving after described the first hello packet, returns to the second hello packet to the described network equipment, has carried the Route Distinguisher information of the described network equipment in described the second hello packet.
The route corresponding described network equipment is notified the process to the described network equipment by described controller, specifically comprise: described controller is after calculating the route that the described network equipment is corresponding, if know and need to carry out routing policy management to route corresponding to the described network equipment, described controller is determined the route after routing policy management, and the route after described routing policy management is notified to the described network equipment.
Between described controller and the network equipment, be connected by dedicated tunnel, and by message mutual between described dedicated tunnel transmission control unit (TCU) and the network equipment, and by route mutual between described dedicated tunnel transmission control unit (TCU) and the network equipment.
The embodiment of the present invention provides a kind of controller, be applied to and comprise described controller and the network equipment Open Shortest Path First in ospf network, described controller specifically comprises: message sending module, for sending the Link State request link state request packet for request link state advertisement LSA to the described network equipment; Message receiver module, for receiving the link state update link state update packet of the LSA that has carried the described network equipment that the described network equipment returns; LSA memory module, for storing the LSA receiving into LSD LSDB; Routing calculation module, for the LSA recording based on described LSDB, for described network device computes goes out the shortest path tree taking the described network equipment as root, and utilizes described shortest path tree to calculate the route that the described network equipment is corresponding; Route sending module, for notifying the route corresponding described network equipment to the described network equipment.
Described message receiver module, also for sending to the described network equipment for before asking the link state request packet of LSA, receive the first database description Data Description (DD) packet from the described network equipment, in described the first Data Description (DD) packet, carried the summary info of the LSA in the local LSDB of the described network equipment; Described message sending module, also for returning to the second Data Description (DD) packet to the described network equipment, does not carry the summary info of the LSA in the local LSDB of described controller in described the second Data Description (DD) packet.
Described message receiver module, also, for before receiving the first Data Description (DD) packet, receives the first hello packet from the described network equipment, the Route Distinguisher information of having carried the described network equipment in described the first hello packet; Described message sending module, also, for returning to the second hello packet to the described network equipment, has carried the Route Distinguisher information of the described network equipment in described the second hello packet.
Described route sending module, specifically for after calculating the route that the described network equipment is corresponding, if know and need to carry out routing policy management to route corresponding to the described network equipment, determine the route after routing policy management, and the route after described routing policy management is notified to the described network equipment.
Between controller and the network equipment, be connected by dedicated tunnel, and by message mutual between described dedicated tunnel transmission control unit (TCU) and the network equipment, and by route mutual between described dedicated tunnel transmission control unit (TCU) and the network equipment.
Compared with prior art, the embodiment of the present invention at least has the following advantages: in the embodiment of the present invention, by record the LSA of all-network equipment in the LSDB of controller, make need in the LSDB of each network equipment, all not record the LSA of all-network equipment, be the LSA that no longer safeguards the whole network in the LSDB of the network equipment, saved greatly the memory space of the LSDB of the network equipment.Further, be route corresponding to each network device computes by controller, and the route corresponding network equipment is notified to this network equipment, make each network equipment only need to receive route, no longer need to move SPF algorithm and calculate route, save CPU (Central Processing Unit, the central processing unit) resource of each network equipment.
Brief description of the drawings
Fig. 1 is the application scenarios schematic diagram of the embodiment of the present invention;
Fig. 2 is a kind of route computing method schematic flow sheet that the embodiment of the present invention provides;
Fig. 3 is the structural representation of a kind of controller of providing of the embodiment of the present invention.
Embodiment
For problems of the prior art, the embodiment of the present invention provides a kind of route computing method, application scenarios schematic diagram taking Fig. 1 as the embodiment of the present invention, the method can be applied in the ospf network that comprises controller (being OSPF controller) and multiple network equipments, this controller in ospf network as OSPF server, each network equipment in ospf network as OSPF client.
In the embodiment of the present invention, between the network equipment and the network equipment, need mutual hello packet, to set up neighborhood between the network equipment and the network equipment, but do not need mutual LSA between the network equipment and the network equipment.For example, between network equipment A and network equipment B, set up in the process of neighborhood, network equipment A sends hello packet to network equipment B, has carried the information such as Router-id (Route Distinguisher), regional number and priority level of network equipment A in this hello packet.Network equipment B is receiving after hello packet, responds a hello packet to network equipment A, has carried the Router-id of network equipment A in this hello packet.Network equipment A is receiving after the hello packet of the Router-id that has carried present networks device A, knows that the two-way communication between network equipment A and network equipment B is set up.So far, network equipment A and network equipment B complete the foundation of neighborhood.In subsequent process, between network equipment A and network equipment B, send hello packet by periodicity and carry out maintaining of neighbours.
In the embodiment of the present invention, for the relevant treatment flow process of message transmission between the network equipment and controller, as shown in Figure 2, corresponding handling process specifically can comprise the following steps:
Step 201, the network equipment sends hello packet to controller, receives the hello packet from the network equipment by controller.Wherein, in this hello packet, carry the Route Distinguisher information of this network equipment, but in this hello packet, can not carry regional number and the priority level of this network equipment.
Step 202, controller, after the hello packet of receiving from the network equipment, returns to hello packet to this network equipment, and in this hello packet, has carried the Route Distinguisher information of this network equipment.
Step 203, the network equipment, after receiving the hello packet of the Route Distinguisher information of having carried present networks equipment, knows that the two-way communication between present networks equipment and control device is set up, and neighbor state is become to UP.So far, the network equipment and controller complete the foundation of neighborhood.In subsequent process, between the network equipment and controller, send hello packet by periodicity and carry out maintaining of neighbours.
Step 204, the network equipment sends DD (Database Description, database description) message to controller, receives the Data Description (DD) packet from the network equipment afterwards by controller.
Wherein, in this Data Description (DD) packet, carried the summary info of the LSA in the LSDB of network equipment this locality.Because each network equipment only need to be safeguarded the LSA of present networks equipment in local LSDB, and no longer safeguard the LSA of other network equipment, therefore, the summary info carrying in this Data Description (DD) packet only comprises the summary info of the LSA of present networks equipment, and does not comprise the summary info of the LSA of other network equipment.
Wherein, in this Data Description (DD) packet, also comprise following field: (1) I field, I field is that the current Data Description (DD) packet of 1 expression is an empty message, in Data Description (DD) packet, does not carry the summary info of LSA; I field is that the current Data Description (DD) packet of 0 expression is not an empty message, in Data Description (DD) packet, carries the summary info of LSA; (2) M field, M field is that the current Data Description (DD) packet of 1 expression is not last Data Description (DD) packet, M field is that the current Data Description (DD) packet of 0 expression is last Data Description (DD) packet; (3) M/S field, M/S field be the current transmission Data Description (DD) packet of 1 expression be Master equipment, M/S field be the current transmission Data Description (DD) packet of 0 expression be Slave equipment; (4) Seq field, the i.e. sequence number information of current Data Description (DD) packet.
In prior art, between the network equipment and the network equipment, in the time of transmission Data Description (DD) packet, need to first negotiate taking which network equipment and carry out synchronizing process as main, between two network equipments, negotiate Master equipment and Slave equipment.Based on this, first Data Description (DD) packet that the network equipment sends to another network equipment is an empty message, and the I field of first Data Description (DD) packet is 1.In the embodiment of the present invention, between the network equipment and controller in transmission when Data Description (DD) packet, need between the network equipment and controller, not negotiate Master equipment and Slave equipment, the network equipment is directly as Master equipment, therefore first Data Description (DD) packet that the network equipment sends to controller is not an empty message, and the I field of first Data Description (DD) packet is 0.
Based on above-mentioned analysis, in the embodiment of the present invention, the I field of the Data Description (DD) packet that the network equipment sends to controller is 0.If the Data Description (DD) packet of current transmission is not last Data Description (DD) packet, the M field of the Data Description (DD) packet that network equipment sends to controller is 1; If the Data Description (DD) packet of current transmission is last Data Description (DD) packet, the M field of the Data Description (DD) packet that network equipment sends to controller is 0.Because the network equipment is as Master equipment, the M/S field of the Data Description (DD) packet that therefore network equipment sends to controller is 1.
Step 205, controller is after the Data Description (DD) packet of receiving from the network equipment, from this Data Description (DD) packet, obtain the summary info of the LSA in the LSDB of network equipment this locality, and return to Data Description (DD) packet to the network equipment, and in this Data Description (DD) packet, do not carry the summary info of the LSA in the local LSDB of controller.
In the embodiment of the present invention, the Data Description (DD) packet that controller sends to the network equipment, only as the back message using of the Data Description (DD) packet from the network equipment, can not carry the summary info of the LSA in the local LSDB of controller in this Data Description (DD) packet.The I field of the Data Description (DD) packet that further, controller sends to the network equipment is 0.In addition,, if the Data Description (DD) packet of current transmission is not last Data Description (DD) packet, the M field of the Data Description (DD) packet that controller sends to the network equipment is 1; If the Data Description (DD) packet of current transmission is last Data Description (DD) packet, the M field of the Data Description (DD) packet that controller sends to the network equipment is 0.In addition,, because controller is as Slave equipment, the M/S field of the Data Description (DD) packet that therefore controller sends to the network equipment is 0.
Step 206, controller sends LSR (Link State Request, Link State request) message to the network equipment, and this link state request packet is for asking the LSA of this network equipment.
Wherein, controller and the network equipment are after mutual complete Data Description (DD) packet, controller can utilize the summary info of the LSA in the LSDB of the network equipment this locality of carrying in Data Description (DD) packet, know which LSA in the LSDB of network equipment this locality is unexistent in the LSDB of controller this locality, for these LSA, controller sends link state request packet to the network equipment, to ask the network equipment that these LSA are sent to controller.
Step 207, the network equipment is being received after the link state request packet of self-controller, sends LSU (Link State Update, the link state update) message of the LSA that has carried the network equipment to controller.
In the embodiment of the present invention, the network equipment is after receiving the link state request packet of self-controller, for the LSA of the controller request of carrying in link state request packet, the network equipment is inquired about the LSA of controller request from local LSDB, and the LSA inquiring is sent to controller by link state update packet.
In the embodiment of the present invention, owing to there being multiple network equipments in OPSF network, therefore, controller can send the link state request packet for asking LSA to multiple network equipments respectively, receiving after the link state request packet of self-controller, by link state update packet, the LSA of controller request is sent to controller by each network equipment.
Step 208, the link state update packet of the LSA that has carried the network equipment that the controller reception network equipment returns, and the LSA carrying in the link state update packet of receiving is stored in local LSDB.
In the embodiment of the present invention, in above-mentioned processing procedure, each network equipment can send the LSA in local LSDB to controller, and controller can not send the LSA in local LSDB to each network equipment.
Based on above-mentioned processing, the network equipment can send to controller by the LSA in local LSDB, and controller can be safeguarded the LSA in the LSDB of all-network equipment in local LSDB.Afterwards, if there is the LSA in the local LSDB of the network equipment to change, this network equipment can be notified the LSA after changing to controller, is upgraded the LSA after this variation by controller in local LSDB.
Step 209, based on the LSA recording in the local LSDB of controller, controller is that network device computes goes out the shortest path tree taking this network equipment as root, and utilizes this shortest path tree to calculate the route that this network equipment is corresponding, and route corresponding this network equipment is notified to this network equipment.
Concrete, owing to having recorded the LSA of all-network equipment in the local LSDB of controller, therefore the LSA based on recording in local LSDB, controller can pass through SPF algorithm, for every network device computes goes out the shortest path tree taking this network equipment as root, thereby utilize this shortest path tree to calculate this network equipment and arrive the best route of other network equipment of internal system, and this route is notified to the network equipment.
In the embodiment of the present invention, the route that controller allows keeper to generate this controller is carried out tactical management, makes the management of route more intuitively, facilitates network management.Wherein, when the route that keeper generates this controller is carried out tactical management, keeper can carry out tactical management to the route of the separate unit network equipment, also can carry out tactical management to the route of all-network equipment.Based on this, controller is after calculating the route that the network equipment is corresponding, if know and need to carry out routing policy management to route corresponding to the network equipment, controller is determined the route (route this controller being generated is carried out the route obtaining after tactical management) after routing policy management, and the route after routing policy management is notified to the network equipment.
In the embodiment of the present invention, between controller and the network equipment, be connected by dedicated tunnel, and by message mutual between dedicated tunnel transmission control unit (TCU) and the network equipment (being hello packet, Data Description (DD) packet etc.), and by route mutual between dedicated tunnel transmission control unit (TCU) and the network equipment.Wherein, this dedicated tunnel includes but not limited to GRE (Generic Routing Encapsulation; generic route encapsulation) tunnel, IPSec (Internet Protocol Security; procotol fail safe) tunnel etc.; in the embodiment of the present invention, this dedicated tunnel is repeated no more, all tunnels that can transmission information are all within protection range of the present invention.
In sum, in the embodiment of the present invention, by record the LSA of all-network equipment in the LSDB of controller, make need in the LSDB of each network equipment, all not record the LSA of all-network equipment, be the LSA that no longer safeguards the whole network in the LSDB of the network equipment, saved greatly the memory space of the LSDB of the network equipment.Further, be route corresponding to each network device computes by controller, and the route corresponding network equipment is notified to this network equipment, make each network equipment only need to receive route, no longer need to move SPF algorithm and calculate route, saved the cpu resource of each network equipment.
Based on the inventive concept same with said method, a kind of controller is also provided in the embodiment of the present invention, be applied in the ospf network that comprises controller and the network equipment, as shown in Figure 3, described controller specifically comprises: message sending module 11, for sending the Link State request link state request packet for request link state advertisement LSA to the described network equipment; Message receiver module 12, for receiving the link state update link state update packet of the LSA that has carried the described network equipment that the described network equipment returns; LSA memory module 13, for storing the LSA receiving into LSD LSDB; Routing calculation module 14, for the LSA recording based on described LSDB, for described network device computes goes out the shortest path tree taking the described network equipment as root, and utilizes described shortest path tree to calculate the route that the described network equipment is corresponding; Route sending module 15, for notifying the route corresponding described network equipment to the described network equipment.
Described message receiver module 12, also for sending to the described network equipment for before asking the link state request packet of LSA, receive the first database description Data Description (DD) packet from the described network equipment, in described the first Data Description (DD) packet, carried the summary info of the LSA in the local LSDB of the described network equipment;
Described message sending module 11, also for returning to the second Data Description (DD) packet to the described network equipment, does not carry the summary info of the LSA in the local LSDB of described controller in described the second Data Description (DD) packet.
Described message receiver module 12, also, for before receiving the first Data Description (DD) packet, receives the first hello packet from the described network equipment, the Route Distinguisher information of having carried the described network equipment in described the first hello packet; Described message sending module 11, also, for returning to the second hello packet to the described network equipment, has carried the Route Distinguisher information of the described network equipment in described the second hello packet.
Described route sending module 15, specifically for after calculating the route that the described network equipment is corresponding, if know and need to carry out routing policy management to route corresponding to the described network equipment, determine the route after routing policy management, and the route after described routing policy management is notified to the described network equipment.
In the embodiment of the present invention, between controller and the network equipment, be connected by dedicated tunnel, and by message mutual between described dedicated tunnel transmission control unit (TCU) and the network equipment, and by route mutual between described dedicated tunnel transmission control unit (TCU) and the network equipment.
Wherein, the modules of apparatus of the present invention can be integrated in one, and also can separate deployment.Above-mentioned module can be merged into a module, also can further split into multiple submodules.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential general hardware platform by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions (can be personal computers in order to make a computer equipment, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into multiple submodules.The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.Disclosed is above only several specific embodiment of the present invention, and still, the present invention is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (10)
1. a route computing method, the method is applied to and comprises controller and the network equipment Open Shortest Path First in ospf network, it is characterized in that, said method comprising the steps of:
Described controller sends the Link State request link state request packet for request link state advertisement LSA to the described network equipment, and receive the link state update link state update packet of the LSA that has carried the described network equipment that the described network equipment returns, and the LSA receiving is stored in LSD LSDB;
Based on the LSA recording in described LSDB, described controller is that described network device computes goes out the shortest path tree taking the described network equipment as root, and utilize described shortest path tree to calculate the route that the described network equipment is corresponding, and the route corresponding described network equipment is notified to the described network equipment.
2. the method for claim 1, is characterized in that, described controller sends for before asking the link state request packet of LSA to the described network equipment, and described method also comprises:
Described controller receives the first database description Data Description (DD) packet from the described network equipment, has carried the summary info of the LSA in the local LSDB of the described network equipment in described the first Data Description (DD) packet;
Described controller, receiving after described the first Data Description (DD) packet, returns to the second Data Description (DD) packet to the described network equipment, does not carry the summary info of the LSA in the local LSDB of described controller in described the second Data Description (DD) packet.
3. method as claimed in claim 2, is characterized in that, before described controller receives the first database description Data Description (DD) packet from the described network equipment, described method also comprises:
Described controller receives the first hello packet from the described network equipment, the Route Distinguisher information of having carried the described network equipment in described the first hello packet;
Described controller, receiving after described the first hello packet, returns to the second hello packet to the described network equipment, has carried the Route Distinguisher information of the described network equipment in described the second hello packet.
4. the method for claim 1, is characterized in that, the route corresponding described network equipment is notified the process to the described network equipment by described controller, specifically comprises:
Described controller is after calculating the route that the described network equipment is corresponding, if know and need to carry out routing policy management to route corresponding to the described network equipment, described controller is determined the route after routing policy management, and the route after described routing policy management is notified to the described network equipment.
5. the method as described in claim 1-4 any one, it is characterized in that, between described controller and the network equipment, be connected by dedicated tunnel, and by message mutual between described dedicated tunnel transmission control unit (TCU) and the network equipment, and by route mutual between described dedicated tunnel transmission control unit (TCU) and the network equipment.
6. a controller, is applied to and comprises described controller and the network equipment Open Shortest Path First in ospf network, and it is characterized in that, described controller specifically comprises:
Message sending module, for sending the Link State request link state request packet for request link state advertisement LSA to the described network equipment;
Message receiver module, for receiving the link state update link state update packet of the LSA that has carried the described network equipment that the described network equipment returns;
LSA memory module, for storing the LSA receiving into LSD LSDB;
Routing calculation module, for the LSA recording based on described LSDB, for described network device computes goes out the shortest path tree taking the described network equipment as root, and utilizes described shortest path tree to calculate the route that the described network equipment is corresponding;
Route sending module, for notifying the route corresponding described network equipment to the described network equipment.
7. controller as claimed in claim 6, is characterized in that,
Described message receiver module, also for sending to the described network equipment for before asking the link state request packet of LSA, receive the first database description Data Description (DD) packet from the described network equipment, in described the first Data Description (DD) packet, carried the summary info of the LSA in the local LSDB of the described network equipment;
Described message sending module, also for returning to the second Data Description (DD) packet to the described network equipment, does not carry the summary info of the LSA in the local LSDB of described controller in described the second Data Description (DD) packet.
8. controller as claimed in claim 7, is characterized in that,
Described message receiver module, also, for before the first Data Description (DD) packet receiving from the described network equipment, receives the first hello packet from the described network equipment, the Route Distinguisher information of having carried the described network equipment in described the first hello packet;
Described message sending module, also, for returning to the second hello packet to the described network equipment, has carried the Route Distinguisher information of the described network equipment in described the second hello packet.
9. controller as claimed in claim 6, is characterized in that,
Described route sending module, specifically for after calculating the route that the described network equipment is corresponding, if know and need to carry out routing policy management to route corresponding to the described network equipment, determine the route after routing policy management, and the route after described routing policy management is notified to the described network equipment.
10. the controller as described in claim 6-9 any one, it is characterized in that, between controller and the network equipment, be connected by dedicated tunnel, and by message mutual between described dedicated tunnel transmission control unit (TCU) and the network equipment, and by route mutual between described dedicated tunnel transmission control unit (TCU) and the network equipment.
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