CN112073319A - Path switching method and system - Google Patents
Path switching method and system Download PDFInfo
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- CN112073319A CN112073319A CN201910497370.3A CN201910497370A CN112073319A CN 112073319 A CN112073319 A CN 112073319A CN 201910497370 A CN201910497370 A CN 201910497370A CN 112073319 A CN112073319 A CN 112073319A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
Abstract
The invention discloses a path switching method and a path switching system, which are applied to data forwarding equipment comprising a main control unit and a plurality of line transmission units and relate to the technical field of communication. The path switching method comprises the following steps: the main control unit respectively issues configuration information to two line transmission units positioned on different paths, wherein the different paths have a rerouting relationship or a main standby relationship; the main control unit generates a control signal for switching the path according to the configuration information and respectively sends the control signal to the two line transmission units according to the sequence of deleting the path and then establishing the path; the line transmission unit performs configuration processing of path deletion or path establishment according to the received configuration information, and validates the configuration processing in response to the control signal. The invention can effectively control the path to switch according to the sequence of deleting and establishing the path.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a path switching method and system.
Background
When a communication Network device forwards a service, Data may be transmitted through a switching system, for example, an Optical Transport Network (OTN) device of a core convergence layer, and a cell switching system is generally adopted in the industry to implement electrical crossing of Optical Channel Data Unit (ODUk) channels. The cell exchange system is a distributed multi-stage cross mode, which is different from the traditional time division cross connection and controls the cross board card, in the unified cell exchange system, the cell is mainly controlled and sent to a specific destination port at a source port, and the cross matrix of the exchange board is automatically forwarded to the destination board card, thereby completing the cross connection of a service channel in the cell exchange system.
For a service rerouting scenario, an original path is required to stop sending cells, and a new path starts sending cells, so a control plane in a cell switching system needs to issue configuration information to delete an ODUk channel of the original path and establish an ODUk channel of the new path. When the original path and the new path are located on the boards of different slot positions, since the responses of different service boards to the configuration information are processed asynchronously, at a certain time of the path switching, it may occur that cells of the ODUk channel of the original path and the ODUk channel of the new path point to the same host port, which causes the occupation of the backplane bandwidth and affects other normal services. Although the time delay control is performed in the process of issuing the configuration information, the out-of-order congestion can be avoided, the reliability of blind time delay is insufficient, the service damage time is easily prolonged, and the requirement of a large number of service configurations is difficult to meet.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a path switching method and a path switching system, which can effectively control paths to switch according to the sequence of deleting and then establishing.
The invention provides a path switching method, which is applied to data forwarding equipment comprising a main control unit and a plurality of line transmission units, and comprises the following steps:
the main control unit respectively issues configuration information to the two line transmission units on different paths, wherein the different paths have a rerouting relationship or a main standby relationship;
the main control unit generates a control signal for switching the path according to the configuration information and respectively sends the control signal to the two line transmission units according to the sequence of deleting the path and then establishing the path;
and the line transmission unit carries out configuration processing of path deletion or path establishment according to the received configuration information and responds to the control signal to carry out configuration processing.
On the basis of the above technical solution, before the main control unit issues the configuration information, the method further includes:
and the main control unit maintains the association relation for the service channels in the paths with the rerouting relation or the main standby relation.
On the basis of the technical scheme, the method further comprises the following steps:
and for the service channel without the incidence relation, the main control unit generates and directly sends a control signal corresponding to the service channel.
On the basis of the above technical solution, before the main control unit issues the configuration information, the method further includes:
and synchronous time sequence communication is established between the main control unit and the two line transmission units based on Field Programmable Gate Array (FPGA) logic control so as to transmit the control signals.
On the basis of the above technical solution, the control signals sent by the main control unit to the two line transmission units have a difference of n system clock cycles, where n is zero or a positive integer.
The invention also provides a path switching system, which is applied to data forwarding equipment comprising a main control unit and a plurality of line transmission units, wherein the system comprises a service configuration module and a synchronous control module which are arranged in the main control unit, and a configuration processing module and a switching control module which are arranged in two line transmission units, wherein the two line transmission units are positioned on different paths, and the different paths have a rerouting relation or a main standby relation;
the service configuration module is used for respectively issuing configuration information to the configuration processing module and the synchronous control module;
the synchronous control module is used for respectively generating control signals for path switching according to the configuration information and sending the control signals to the two switching control modules according to the sequence of path deletion and path establishment;
the configuration processing module is used for carrying out configuration processing of path deletion or path establishment according to the received configuration information;
the switching control module is used for responding to the control signal and informing the configuration processing module to take effect of configuration processing.
On the basis of the technical scheme, the service configuration module is further configured to receive and analyze service management information issued by a control plane or a management plane to obtain the configuration information and a service channel in the path;
the synchronous control module is also used for maintaining the association relation for the service channel in the path with the rerouting relation or the main standby relation.
On the basis of the above technical solution, the synchronization control module is further configured to generate and directly send a control signal corresponding to the service channel for the service channel that does not have the association relationship.
On the basis of the technical scheme, synchronous time sequence communication is established between the main control unit and each switching control module based on FPGA logic control so as to transmit the control signals.
On the basis of the above technical solution, the synchronous control module is further configured to send the control signal to the two switching control modules with a difference of n system clock cycles, where n is zero or a positive integer.
Compared with the prior art, the path switching method provided by the embodiment of the invention is applied to the data forwarding equipment comprising the main control unit and the plurality of line transmission units, and comprises the following steps: the main control unit respectively issues configuration information to two line transmission units positioned on different paths, wherein the different paths have a rerouting relationship or a main standby relationship; the main control unit generates a control signal for switching the path according to the configuration information and respectively sends the control signal to the two line transmission units according to the sequence of deleting the path and then establishing the path; the line transmission unit carries out configuration processing of path deletion or path establishment according to the received configuration information, and responds to the control signal to take effect of the configuration processing. Therefore, the path switching can be effectively controlled according to the sequence of deleting the path first and then establishing the path.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a path switching method according to an embodiment of the present invention;
FIG. 2 is a diagram of a path switching system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a distributed cell switching system;
fig. 4 is a flowchart of a path switching method of an OTN device;
fig. 5 is a flowchart of a path management method of an OTN device.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Referring to fig. 1, an embodiment of the present invention provides a path switching method, which is applied to a data forwarding device including a main control unit and a plurality of line transmission units, where the data forwarding device may be a router, a switch, or an OTN device in a core convergence layer.
Specifically, each of the circuit transmission units is used for forwarding data, which may be, but not limited to, a cell, a packet, or a designated data unit, wherein the designated data unit includes a code block having a designated number of bits, such as a 66B code block.
The main control unit is used for managing each line transmission unit and realizing data forwarding. For example, when an original path failure is detected, a rerouting procedure needs to be initiated. If the service is rerouted non-returnable, the deletion of the original path and the establishment of a new path need to be issued. If the service is a rerouting return type, the configuration of the original path needs to be reserved, and resource occupation of the original path, such as an ODUk channel mapping path of the original path and an occupied line timeslot, is ensured, so that the service can return to the original path after fault recovery. For the rerouting return process, a return command of the original path needs to be issued, and a delete command of the new route needs to be issued, so that resources are released.
The rerouting protection is based on the original path and the rerouting path, the 1+1 protection is based on the main and backup paths, each path passing through at least one line transfer unit of the data forwarding device.
The path switching method comprises the following steps:
s110, the main control unit respectively issues configuration information to two line transmission units on different paths, wherein the different paths have a rerouting relationship or a main standby relationship.
Specifically, the different paths may be an original path and a rerouting path, or may be a main path and a backup path.
S120, the line transmission unit carries out configuration processing of path deletion or path establishment according to the received configuration information. The main control unit respectively generates control signals for path switching according to the configuration information and sends the control signals to the two line transmission units according to the sequence of path deletion and path establishment.
S130 the line delivery unit effects configuration processing in response to the control signal.
Taking rerouting protection as an example, the first line transfer unit is located on the original path, and the second line transfer unit is located on the rerouting path.
In step S110, in the rerouting non-return scenario, the configuration information for deleting the original path is sent to the first line transfer unit, and the configuration information for establishing the rerouting path is sent to the second line transfer unit.
In step S120, the first line transfer unit performs configuration processing of deleting the original path according to the configuration information of deleting the original path, and the second line transfer unit performs configuration processing of establishing the rerouted path according to the configuration information of the rerouted path.
The main control unit generates a first control signal for path switching according to the configuration information for deleting the original path, and generates a second control signal for path switching according to the configuration information for establishing the rerouting path. The order of generating the first control signal and the second control signal is not limited, but the first control signal and the second control signal are transmitted in the order of deleting the path first and then establishing the path, that is, the first control signal is transmitted to the first line transfer unit first, and then the second control signal is transmitted to the second line transfer unit.
In step S130, the first line transmitting unit deletes the original path after receiving the first control signal, and the second line transmitting unit performs data forwarding on the rerouting path after receiving the second control signal, thereby completing the path switching.
The embodiment of the invention controls the path switching by configuring information asynchronous processing and data forwarding synchronous processing. In the asynchronous processing of the configuration information, the two line transmission units directly respond to the issued configuration information to carry out the path configuration processing, but the path configuration processing is not effective for the moment. In the data forwarding synchronous processing, after a control signal arrives, data forwarding is triggered, so that the data forwarding sequence of different line transmission units is effectively controlled in a scene in which the path deletion and establishment sequence needs to be controlled, the service damage time caused by path switching is reduced, the bandwidth of other services is prevented from being occupied by double traffic crowding, and the safety of other services is ensured.
In an alternative embodiment, for example, in a distributed switching system, each line transfer unit is provided with a traffic channel for data forwarding, and in the case of supporting a control plane, the path switching method includes:
s210 the main control unit receives and analyzes the service management information sent by the control plane or the management plane, to obtain the configuration information and the service channel in the line transmission unit.
S220 the main control unit respectively issues configuration information to two line transmission units on different paths, wherein the different paths have a rerouting relationship or a main standby relationship.
Specifically, the configuration information sent by the main control unit includes data of deleting, establishing, and the like of the service channel.
S230, the line transmitting unit performs configuration processing of service channel deletion or service channel establishment according to the received configuration information. The main control unit respectively generates control signals of the service channels according to the configuration information and sends the control signals to the two line transmission units according to the sequence of deleting and then establishing the service channels.
The main control unit maintains the association relation for the service channels in the path with the rerouting relation or the main standby relation.
Specifically, for rerouting protection, an association relationship is established between the original path and the new path, and the original path and the new path are stored in an association channel group. For 1+1 protection, the association relationship between the primary path and the backup path is established and stored in another associated channel group.
S240 the line transfer unit effects configuration processing in response to the control signal.
In an optional implementation manner, before the path switching method according to the embodiment of the present invention, synchronous timing communication is established between the main control unit and the two line transmission units based on Field Programmable Gate Array (FPGA) logic control, so as to transmit the control signal.
Taking an OTN device as an example, the OTN device includes a main control board card serving as a main control unit and a plurality of service board cards serving as line transmission units, an electrical cross of ODUk channels is realized by using a cell switching system, and the main control board card and each service board card communicate through a backplane bus.
Independent of a Central Processing Unit (CPU) based on each service board card, a Central Processing Unit (CPU) issues an ODUk channel of configuration information, and then FPGA logic of a main control board card and each service board card is adopted, a switching control Unit based on a synchronous timing sequence is designed on each service board card, and whether an ODUk channel associated with the same service sends cells to the outside is synchronously controlled through a time division system bus.
Specifically, the FPGAs of the main control board and the service board use the same system framing signal as a reference, and use the system clock as a beat count to establish synchronous timing sequence communication. The main control board card writes a system backplane bus, sends a group of control signals of the associated ODUk channels to the service board card, and the service board card associated with the ODUk channels analyzes the control signals received from the backplane bus.
Because different service board cards adopt the same system framing signal and the same system clock, when the main control board card sends the same control signal to different service board cards, the time of receiving the control signal by different service board cards is synchronous.
Specifically, in step S230, the main control unit triggers the logic circuit of the synchronous timing sequence, and sends the control signal of the service channel to the backplane bus according to the sequence that the service channel is deleted first and then established. The logic control of the switching control units of the two line transmission units is carried out according to time sequence, and the service channels are ensured to be switched in order by different line transmission units.
Therefore, the configuration information asynchronous processing and the data forwarding synchronous processing are independent from each other, wherein the configuration information asynchronous processing issues the ODUk channel of the configuration information through the existing CPU based on each service board card, and the data forwarding synchronous processing not only achieves the preset cell sending sequence and avoids the situation that cells compete for the service channel, but also reduces the time spent on path switching through the synchronous time sequence based on the FPGA logic, thereby realizing ideal rerouting and 1+1 protection.
Specifically, in the OTN device, the main control unit obtains mapping data of the ODUk channels on the line transport unit based on the service management information, divides the ODUk channels having an association relationship into an association channel group according to a cross connection relationship between the ODUk channels and the client service, analyzes a relationship between different ODUk channels in the service scenario according to a requirement of the service scenario, controls a cell switching sequence of different ODUk channels according to a scenario requirement, and notifies the FPGA logic device to send a control signal of the ODUk channel to the line transport unit of the slot where the ODUk channel is located.
Furthermore, the control signals sent by the main control unit according to the sequence established after the service channels are deleted firstly have a difference of n system clock cycles, wherein n is zero or a positive integer, so as to ensure the synchronous response time after the control signals are received by different line transmission units.
For the scenario of rerouting protection, in an embodiment, the main control unit first sends a first control signal for deleting a service channel on an original path, and then sends a second control signal for establishing a service channel on a newly-established path, where the first control signal and the second control signal are sent only in sequence, without performing delay, for example, without spacing a system clock cycle. In another embodiment, the first control signal and the second control signal may also differ by 1 or several system clock cycles.
Specifically, the value of n is determined according to the response time of the data forwarding of the two line transmission units, so as to ensure that the response time meets the order of deleting and then establishing the service channel.
In an optional implementation manner, for a service channel that does not have the above-mentioned association relationship, the main control unit generates and directly sends a control signal corresponding to the service channel, so as to adapt to path management in various scenarios.
Referring to fig. 2, an embodiment of the present invention further provides a path switching system, which is applied to a data forwarding device including a main control unit and a plurality of line transmission units, and is used to implement the path switching method according to the foregoing embodiment.
The path switching system comprises a service configuration module and a synchronous control module which are arranged in a main control unit, and a configuration processing module and a switching control module which are arranged in two line transmission units, wherein the two line transmission units are positioned on different paths, and the different paths have a rerouting relation or a main standby relation. The two line transmission units are a first line transmission unit and a second line transmission unit.
The service configuration module is used for respectively issuing configuration information to the configuration processing module and the synchronous control module.
The synchronous control module is used for respectively generating control signals for path switching according to the configuration information and sending the control signals to the two switching control modules according to the sequence of path deletion and path establishment.
The configuration processing module is used for carrying out configuration processing of path deletion or path establishment according to the received configuration information.
The switching control module is used for responding to the control signal and informing the configuration processing module to take effect of configuration processing.
In an optional implementation manner, the service configuration module is further configured to receive and analyze service management information sent by the control plane or the management plane, so as to obtain configuration information and a service channel in the path.
The synchronous control module is also used for maintaining the association relation for the service channels in the paths with the rerouting relation or the main and standby relation.
In an optional implementation manner, the synchronization control module is further configured to generate and directly send a control signal corresponding to a service channel that does not have an association relationship.
In an optional implementation manner, synchronous timing communication is established between the main control unit and each switching control module based on FPGA logic control so as to transmit control signals.
In an optional implementation manner, the synchronization control module is further configured to send a control signal to two switching control modules with a difference of n system clock cycles, where n is zero or a positive integer.
Fig. 3 is a schematic diagram of a distributed cell switching system, where the distributed cell switching system includes a main control unit, two line transmission units, a cell switching unit, and a service transceiving unit, where the main control unit is provided with a service configuration module and a synchronization control module, the two line transmission units are located on different paths, and the different paths have a rerouting relationship or a main standby relationship. The two line transfer units are a first line transfer unit and a second line transfer unit.
The two line transmission units are respectively provided with a configuration processing module and a switching control module, wherein the configuration processing module comprises a line interface unit, a channel processing unit, a cell processing unit and a configuration receiving unit.
Specifically, for the OTN device, the service configuration module is located on the main control unit of the OTN device, and is configured to distribute the configuration data to each line transmission unit according to the service requirement of the control plane. For the process of rerouting the control plane of the optical transport network, the service configuration module issues a newly-created ODUk channel route, and deletes or retains the original ODUk channel route according to the return attribute, at this time, since the processing of configuration information by different line transport units is on different CPUs, and the CPUs are in an asynchronous processing process, which is affected by the difference between busy and idle CPUs, it cannot be ensured that the order of creating and deleting the ODUk channel is consistent with the order of issuing configuration information by the control plane or the management plane.
The synchronous control module is configured to receive all service management information from the service configuration module, analyze complete service data, divide configuration data having a backup relationship or a switching relationship into the same ODUk channel group, and control logic sequence control of the FPGA according to a requirement of a service path switching scenario in combination with configuration processing validation instructions of ODUk channels of different current line transport units, and send a control signal to the switching control module of the line transport unit.
The system comprises a line interface unit, a channel processing unit, a cell processing unit and a unified cell switching unit, wherein the line interface unit is used for recovering a frame structure from a standard OTUk electric signal, the channel processing unit is used for demapping and recovering a service ODUk channel, the cell processing unit is used for carrying out cell segmentation on the ODUk channel, marking a service number on a cell head, editing a target slot position and a target port address of a cell, and then sending the target slot position and the target port address to the unified cell switching unit of the system; a configuration receiving unit receives configuration information of establishment and deletion of an ODUk channel, and configures each functional module of an OTN framing chip to complete configuration processing of the ODUk channel; the switching control unit controls a transmission switch of the segmented ODUk cell, and controls whether the cell is transmitted to the service transceiving unit through the cell switching unit.
The cell exchange unit checks the address table according to the destination address of the cell for automatic forwarding, and performs automatic table look-up forwarding according to the destination port address carried by the cell header, and sends the cell to the specific slot position service transceiving unit.
The service transceiving unit does not identify which line transmission unit the received ODUk cell comes from, only matches according to the destination address, and after uniformly receiving the cells which conform to the address of the service transceiving unit into a specific channel for buffering, original ODUk channel data is restored and demapped into a client service.
Referring to fig. 4, the method for switching paths in an OTN device includes:
and S310, the service configuration module receives the service management information sent by the control plane, and analyzes the service management information to obtain configuration information. Besides being sent to the configuration receiving unit on the service board card, the data are also sent to the synchronous control module for cell control processing. The following steps S320 and S330 are performed simultaneously.
S320, the synchronization control module analyzes the configuration information, and when determining to perform an ODUk channel rerouting or an ODUk1+1 protected primary switching, the process goes to step S340; if it is determined that rerouting return or ODUk1+1 protection return is performed, the process proceeds to step S350.
S330 configures the receiving unit to receive the configuration information of the service channel and performs configuration processing, and then the process proceeds to step S360.
S340 synchronous control module sequentially sends a control signal for stopping an original/primary ODUk channel cell and a control signal for starting a new/standby ODUk channel cell. The control unit of the synchronous control module triggers the FPGA logic circuit and sends a control signal of the service channel to the backboard control bus, so that the logic control of the cell control unit is carried out according to a time sequence.
For example, for a scenario in which rerouting protection needs to be switched to a new ODUk service path, the synchronous control logic circuit sets a channel ID corresponding to an original ODUk member in an ODUk channel group to a closed state (OFF), instructs a first sequence to transmit (a first control signal), sets a channel ID corresponding to the new ODUk service path to an open state (ON), and instructs a second sequence to transmit (a second control signal). For the first control signal and the second control signal, a fixed delay of n system clock cycles is adopted, for example, n is 1, to ensure the synchronous response time after the line transmission unit receives the command, and the value of n is based on ensuring that the response time of the cell processing unit satisfies the sequence.
S350 the synchronous control module sequentially sends a control signal for stopping the new/standby ODUk channel cell and a control signal for starting the original/primary ODUk channel cell.
The synchronous cell module firstly sets the switch states of the ODUk channel cell switches of the line transmission units corresponding to the rerouting service path or the standby channel to command the first sequence to be sent out, and then sets the switch states of the channel cell switches of the line transmission units corresponding to the original service path or the main channel to be switched on to command the second sequence to be sent out. And similarly, the response time of the line transmission unit after receiving the synchronous command is ensured by adopting a mode of delaying the first command and the second command by n system clock cycles fixedly.
S360, the switching control module obtains the cell switch indication information according to the control signal. After a control signal sent by the synchronous control unit arrives, the switching control module is implemented by using an FPGA logic circuit, and first, data of the control signal is analyzed according to a predefined backplane data format, a data instruction code is converted into cell switch indication information of an ODUk channel, and the cell switch indication information is input to the cell processing unit.
S370 cell process unit responds the cell switch indication information to open or close the switch to complete the cell on/off control.
Fig. 5 shows that when the OTN device initializes and processes a service channel without an association relationship, the path management method includes:
s410 the service configuration module receives the service management information sent by the control panel, analyzes the service configuration, identifies the service type and the service change requirement according to the service management information, which channel path needs to be newly added, and sends the channel configuration information to the configuration receiving unit of the service board card for the newly added channel path. For original path channels that are temporarily unused for return rerouting, the channel data is maintained unchanged. Besides being sent to the service board card, the data are also sent to the synchronous control module for cell control processing.
Specifically, the service management information may be service creation of control plane-triggered rerouting, or service creation with ODUk1+1 protection.
The following steps S420 and S430 are performed simultaneously.
And S420, the synchronous control module analyzes the configuration data, groups the configuration data and initializes the switch control. And the synchronous control module searches the associated service channel according to the received configuration information and the protection group information, for the protection of the reroute, the newly established route and the original route are divided into an associated channel group, and for the protection of the ODUk1+1, the primary route and the standby route are divided into an associated channel group. The synchronization control unit sends the initial state of the synchronization control signal to the line transport unit where each service channel is located according to the packet information of the service channels, and for rerouting protection and ODUk1+1 protection, the currently activated route is on, and the inactive route is off. The cell switch state corresponding to the service channel is sent to the line transmission unit through the communication bus of the backplane by carrying information through the FPGA logic, and the step S440 is entered.
S430 configures the receiving unit to receive configuration information of the service channel and perform configuration processing, configures each functional module into a chip, where the chip includes line interface adaptation and service channel mapping, establishes the ODUk channel, and creates a service, where the service creation only completes writing configuration data of the ODUk channel into the OTN chip, but a substantial cell sending switch is closed, and then the process proceeds to step S440.
S440, the switching control module obtains the cell switch indication information according to the control signal. After a control signal sent by the synchronous control unit arrives, the switching control module is implemented by using an FPGA (field programmable gate array) logic circuit, firstly, control data is analyzed according to a defined backplane data format, a data instruction code is converted into cell switch indication information of an ODUk channel, and the cell switch indication information is input to a cell processing unit.
S450 cell process unit responds the cell switch indication information to open or close the switch to complete the cell on/off control.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A path switching method is applied to a data forwarding device comprising a main control unit and a plurality of line transmission units, and is characterized in that the method comprises the following steps:
the main control unit respectively issues configuration information to the two line transmission units on different paths, wherein the different paths have a rerouting relationship or a main standby relationship;
the main control unit generates a control signal for switching the path according to the configuration information and respectively sends the control signal to the two line transmission units according to the sequence of deleting the path and then establishing the path;
and the line transmission unit carries out configuration processing of path deletion or path establishment according to the received configuration information and responds to the control signal to carry out configuration processing.
2. The path switching method according to claim 1, wherein before the main control unit issues the configuration information, the method further comprises:
and the main control unit maintains the association relation for the service channels in the paths with the rerouting relation or the main standby relation.
3. The path switching method according to claim 2, wherein the method further comprises:
and for the service channel without the incidence relation, the main control unit generates and directly sends a control signal corresponding to the service channel.
4. The path switching method according to claim 1, wherein before the main control unit issues the configuration information, the method further comprises:
and synchronous time sequence communication is established between the main control unit and the two line transmission units based on Field Programmable Gate Array (FPGA) logic control so as to transmit the control signals.
5. The path switching method according to claim 4, wherein:
the control signals sent by the main control unit to the two line transmission units have a difference of n system clock cycles, wherein n is zero or a positive integer.
6. A path switching system is applied to a data forwarding device comprising a main control unit and a plurality of line transmission units, and is characterized in that:
the system comprises a service configuration module and a synchronous control module which are arranged in the main control unit, and a configuration processing module and a switching control module which are arranged in the two line transmission units, wherein the two line transmission units are positioned on different paths, and the different paths have a rerouting relation or a main standby relation;
the service configuration module is used for respectively issuing configuration information to the configuration processing module and the synchronous control module;
the synchronous control module is used for respectively generating control signals for path switching according to the configuration information and sending the control signals to the two switching control modules according to the sequence of path deletion and path establishment;
the configuration processing module is used for carrying out configuration processing of path deletion or path establishment according to the received configuration information;
the switching control module is used for responding to the control signal and informing the configuration processing module to take effect of configuration processing.
7. The path switching system according to claim 6, wherein:
the service configuration module is further configured to receive and analyze service management information issued by a control plane or a management plane, so as to obtain the configuration information and a service channel in the path;
the synchronous control module is also used for maintaining the association relation for the service channel in the path with the rerouting relation or the main standby relation.
8. The path switching system according to claim 7, wherein:
the synchronous control module is also used for generating and directly sending a control signal corresponding to the service channel for the service channel without the incidence relation.
9. The path switching system according to claim 6, wherein:
and synchronous time sequence communication is established between the main control unit and each switching control module based on FPGA logic control so as to transmit the control signals.
10. The path switching system according to claim 9, wherein:
the synchronous control module is further configured to send the control signal to the two switching control modules with a difference of n system clock cycles, where n is zero or a positive integer.
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| CN201910497370.3A CN112073319B (en) | 2019-06-10 | 2019-06-10 | Path switching method and system |
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