CN110113258B - Method and system for automatically protecting data surface link by using control surface link - Google Patents
Method and system for automatically protecting data surface link by using control surface link Download PDFInfo
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- H—ELECTRICITY
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- H04L45/00—Routing or path finding of packets in data switching networks
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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 relates to a method and a system for automatically protecting a data plane link by using a control plane link, wherein the method comprises the following steps: collecting topology information of the whole network through a controller; establishing a main path of service exchange between transmission nodes in a data plane link, and establishing a standby path of service exchange between transmission nodes; combining the standby path and the control plane link to construct a combined link; detecting the link fault condition of the main path and the standby path; and automatically performing the switching action of the main path and the standby path according to the link fault condition. The invention provides redundancy protection for the main path in the data plane link by designing the new structure of the transmission node equipment and then issuing the flow table entry by the controller to create the standby path for the main path in the original control plane link resource, thereby avoiding interruption of service communication due to link failure and further improving the reliability of SDN network communication.
Description
Technical Field
The invention belongs to the technical field of communication management facilities, and particularly relates to a method and a system for automatically protecting a data plane link by utilizing a control plane link.
Background
The software defined networking (Software Defined Network, SDN) technology is a new network innovation architecture, which is a way to implement network virtualization. The SDN mainly includes two types of devices: controller, transfer node. The key idea of the SDN architecture is to separate a control plane (control plane) and a data plane (data plane) of network equipment, the transmission nodes open programmable control interfaces, and the central controller centrally controls the transmission nodes of the whole network, so that rich network new functions are realized, network resources are flexibly controlled and scheduled, and the rapidly-developed network demands are met. Wherein the control plane refers to the network interconnection and related control behavior between the controller and the transmitting nodes, and the data plane refers to the network interconnection and related data transmission behavior between the transmitting nodes. The specific data transfer behavior of the data plane will depend on the specific control behavior of the control plane, and typically the controller controls the data forwarding flow table entry (flow table) by issuing it into the transfer node, and the issuing process may follow some issued protocol standards, such as Openflow protocol, netconf protocol, OVSDB protocol, etc. Fig. 1 is a schematic diagram of the overall structure of an SDN.
SDN has two control modes: in-band control and out-of-band control.
Out-of-band control means that the transmission node is connected with the controller by adopting an independent control surface port, and a plurality of transmission nodes and the controller are connected with each other to need an independent network to operate. Typically, the independent network is implemented using conventional techniques.
However, since the out-of-band control in the existing SDN technology needs to build an independent control plane network, as shown in the schematic structural diagram of the conventional SDN transmission node device shown in fig. 2, there are obvious disadvantages that more network device resources and network link resources need to be input, and the data plane and the control plane individually share related network resources, so that once the data plane link fails, network interconnection between transmission nodes and related data transmission capability are directly disabled.
Therefore, a new SDN control manner is needed to fully avoid the situation that the entire SDN architecture is paralyzed due to the failure of the data plane link.
Disclosure of Invention
In view of the foregoing, the present invention provides a method for automatically protecting a data plane link by using a control plane link, where the method includes:
collecting topology information of the whole network through a controller;
establishing a main path of service exchange between transmission nodes in a data plane link, and establishing a standby path of service exchange between transmission nodes;
combining the standby path and the control plane link to construct a combined link;
detecting the link fault condition of the main path and the standby path;
and automatically performing the switching action of the main path and the standby path according to the link fault condition.
Preferably, the full network topology information includes transmission node information, network port information, and link interconnection information.
Preferably, the transmission node information includes bypass port information corresponding to a network port.
Preferably, the controller establishes the primary path by transmitting a data forwarding flow table entry to each of the transmitting nodes through a control plane, and the controller transmits a link protection flow table entry to establish the backup path.
Preferably, the link protection flow table item is issued according to the network port corresponding information of the main path and the bypass port corresponding information of the standby path.
Preferably, the primary path performs single-hop behavior or multi-hop behavior, and the standby path performs hop-by-hop redundancy protection on the primary path.
Preferably, the standby path and the control plane link establish a combined link through a wavelength division multiplexing technology.
Preferably, the controller cooperates and binds the main path and the standby path with corresponding link failure detection sessions, and detects the link failure condition through the link failure detection sessions.
Preferably, when the failure detection session reports that the primary path fails, the switch board automatically cuts the service data flow to a corresponding one-hop of the standby path according to the flow table entry for protection aiming at the one-hop with the link failure.
A system for automatically protecting data surface links by using control surface links comprises the data surface links connected between switching boards of adjacent transmission nodes as a main path for service exchange between the transmission nodes;
the switching board is connected to the combining module through the bypass channel, and a combined link is connected between the combining modules of adjacent transmission nodes and is used as a standby path for service exchange between the transmission nodes through the bypass channel and the combined link;
and the main control board in the transmission node is connected with the combining module, and the standby path and the control surface link are combined and connected to the combining link through the combining module.
Preferably, the switch boards comprise network ports and bypass ports, the switch boards of two adjacent groups of transmission nodes are connected with the data surface links through the network ports, the switch boards are connected with bypass channels through the bypass ports, and the bypass channels are connected to the combining module.
Preferably, the switch board includes at least two groups of network ports, and service data is exchanged through the network ports.
Preferably, the switch board includes at least two groups of bypass ports, and the bypass ports are in one-to-one correspondence with the network ports.
Preferably, the network port and the bypass port are ethernet ports.
Preferably, the combining module comprises a photoelectric conversion module, a wavelength division multiplexing module and a combining port, wherein the photoelectric conversion module is connected with the wavelength division multiplexing module, the wavelength division multiplexing module is connected with the combining port, and the combining modules of two adjacent groups of transmission nodes are connected with a combining link through the combining port;
the photoelectric conversion module has a bidirectional function and is used for carrying out mutual conversion of an optical signal line and an electric signal line with specific wavelengths;
the wavelength division multiplexing module has a bidirectional function and performs interconversion between a plurality of optical lines and one optical line.
Preferably, the bypass channel is provided on the back plate.
The invention has the beneficial effects that:
1. the invention creates a standby path for the data surface active path in the original control surface link resource by designing a new structure of the transmission node equipment and then issuing a flow table item by the controller, thereby providing redundancy protection for the active path in the data surface link, avoiding interruption of service communication due to link failure and further improving the reliability of SDN network communication;
2. in the new structure of the SDN transmission node, a bypass channel is added on the back plate, a bypass port is newly added on the exchange plate to be connected with the bypass channel on the back plate, and a control port of the main control plate is also changed into the bypass channel of which the bypass control port is connected with the back plate; secondly, a combining module is added, and a photoelectric conversion module and a wavelength division multiplexing module are contained, so that a bypass port and a bypass channel of a bypass control port can be combined and transmitted;
3. when the fault detection session reports the fault of the main path, the exchange board automatically cuts the service data stream to one hop of the corresponding standby path according to the stream list item for protection aiming at one hop of the link fault, and the protection cutting process does not need the participation of a controller.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic diagram of an overall structure of an SDN according to the prior art;
fig. 2 illustrates a conventional SDN transmitting node device structure schematic;
FIG. 3 illustrates a system for automatically protecting a data plane link with a control plane link;
FIG. 4 illustrates a flow chart of the present invention for automatically protecting a data plane link with a control plane link;
FIG. 5 is a schematic block diagram showing the output of the control external control software module of the present invention after processing according to various inputs, setting the user_failover type group table Flag bit Flag;
FIG. 6 shows a flow chart of the external control software module process of the present invention;
fig. 7 shows a schematic view of the path of the present invention in the event of a failsafe.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A method for automatically protecting a data plane link with a control plane link, comprising:
the method comprises the steps that full-network topology information is collected through a controller, wherein the full-network topology information comprises transmission node information, network port information and link interconnection information, and the controller collects the full-network topology information based on SDN basic principles and comprises information such as transmission nodes, network ports and link interconnection. In addition, the transmitting node also reports bypass port information corresponding to the network port.
Note that the bypass port and the network port of the switch board are both logically ethernet ports, with the difference that the network port is on the face plate and the bypass port is connected to the backplane bypass channel. Therefore, according to the SDN basic principle, both the bypass port and the network port can be reported to the controller by the transmission node in the topology collection stage. In the present invention, the transmitting node shall additionally report the corresponding information of the network port and the bypass port, for example, the network port 1 corresponds to the bypass port 1, and the network port 2 corresponds to the bypass port 2.
The method comprises the steps that a main path of service exchange between transmission nodes is established in a data surface link, a controller issues data forwarding flow table entries to each transmission node through a control surface in a combining link according to the planning of a user on the service, the data forwarding flow table entries are issued to a main control board of each transmission node, and the main control board determines the main path of the service exchange between the exchange boards according to the data forwarding flow table entries; the method comprises the steps that a standby path of service switching is established between transmission nodes, a controller checks a network port used by a main path, and issues a link protection flow table item according to corresponding information of the network port and a bypass port, the link protection flow table item is issued to a main control board of each transmission node, the main control board controls a switching board of the network node where the main control board is located according to the link protection flow table item, a bypass channel of the switching board and a combined link are adopted to establish the standby path of the service switching, and hop-by-hop redundancy protection is carried out on the main path of the service switching through the standby path.
And combining the standby path with the control surface link to construct a combined link, wherein the standby path and the control surface link construct the combined link through a wavelength division multiplexing technology. Specifically, the bypass channel of the standby path and the main control board perform photoelectric conversion through the photoelectric conversion module, the electric signal is converted into an optical signal with a specific wavelength to be independently transmitted, and then the independently transmitted optical signal with the specific wavelength is combined and transmitted in an optical line through the wavelength division multiplexing module and is transmitted to the wavelength division multiplexing module of the adjacent transmission node; the wavelength division multiplexing module of the adjacent station divides a single optical line, divides the single optical line into a plurality of lines according to the wavelength of an optical signal in the single optical line, outputs the optical signal to a corresponding photoelectric conversion module, converts the optical signal into an electric signal again through the photoelectric conversion module, and sends the electric signal to a main control board and a switching board respectively.
And detecting the link fault condition of the main path and the standby path. The controller cooperates and binds the main path and the standby path with corresponding link fault detection session, and detects the link fault condition through the link fault detection session. When the fault detection session reports the fault of the primary path, the exchange board automatically cuts the service data stream to a corresponding one-hop of the standby path according to the stream list item for protection aiming at the one-hop of the link fault.
In view of the above-mentioned control method, a system for automatically protecting a data plane link by using a control plane link is provided, as shown in fig. 3, compared with a traditional SDN network, first, a bypass channel is added on a back plane, a new bypass port of a switch board is connected to the bypass channel on the back plane, and a control port of a main control board is also changed into a bypass channel connected to the bypass control port on the back plane; and secondly, a combining module is added, and a photoelectric conversion module and a wavelength division multiplexing module are included, so that the bypass channel of the bypass port and the bypass control port can be combined and then transmitted to be demultiplexed again at the receiving end. The photoelectric conversion module can convert the multipath Ethernet electric signals of the bypass channel into multipath Ethernet optical signals, the wavelength division multiplexing module can modulate the multipath Ethernet optical signals to different optical wavelengths, the multipath Ethernet optical signals are then uniformly transmitted in the same optical fiber link, the Ethernet optical signals with different wavelengths are not interfered with each other, the Ethernet optical signals share sufficient transmission bandwidth, and the receiving end can also de-multiplex the Ethernet optical signals from the same optical fiber link. After the addition of the channel-dividing module, the channel-dividing module provides a channel-dividing port for network interconnection, wherein the network interconnection comprises a control surface.
The communication mode between two groups of transmission nodes (transmission node X and transmission node X+1) is used for illustration, each group of transmission nodes comprises a group of main control boards and n groups of exchange boards (n is any positive integer), a bypass control port 1 and a bypass control port 2 are arranged on the main control boards, each group of exchange boards is provided with a bypass port and a network port, the bypass ports comprise a bypass port 1 and a bypass port 2, and the network ports comprise a network port 1 and a network port 2. The switch boards of two adjacent groups of transmission nodes are connected in one-to-one correspondence through a data plane link, and illustratively, the network port 2 of the switch board 1 of the transmission node X is connected with the network port 1 of the switch board 1 of the transmission node x+1 through the data plane link, and the network port 2 of the switch board n of the transmission node X is connected with the network port 1 of the switch board n of the transmission node x+1 through the data plane link.
The bypass port of the exchange board is connected to a bypass channel arranged on the back board, the bypass control port of the main control board and the bypass channel of the exchange board are connected to a combining module, and a combining link is established between two groups of adjacent transmission nodes through the combining module. The combining module comprises a photoelectric conversion module, two groups of wavelength division multiplexing modules (WDM, wavelength DivisionMultiplexing) and two groups of combining ports, the bypass channel and the bypass control port are both connected to the photoelectric conversion module, the photoelectric conversion module is connected with the wavelength division multiplexing module, and the wavelength division multiplexing module is connected with the combining link through the combining ports.
Illustratively, the bypass port 2 of the switch board 1 of the transmission node X is sequentially connected to the transmission node x+1 through the bypass channel of the transmission node X, the photoelectric conversion module, the wavelength division multiplexing module 2 and the combining port 2, and the combining port 2 of the transmission node X sequentially passes through the combining port 1 of the transmission node x+1, the wavelength division multiplexing module 1 and the photoelectric conversion module and is connected to the bypass port 1 of the switch board 1 of the transmission node x+1, so as to construct a standby path of the active path between the switch board 1 of the transmission node X and the switch board 1 of the transmission node x+1, and redundant protection is performed on the active path. The standby path between the exchange board 1 of the transmission node X and the exchange board 1 of the transmission node x+1 performs mutual conversion of the ethernet electrical signal and the optical signal with the wavelength of λ1 through the photoelectric conversion module, the optical signal with the wavelength of λ1 is combined at the combining link through the wavelength division multiplexing module and transmitted, and the combined optical signal is separated through the wavelength division multiplexing module and transmitted to the corresponding port of the photoelectric conversion module. Similarly, the bypass port 2 of the switch board n of the transmission node X is connected to the transmission node x+1 sequentially through the bypass channel of the transmission node X, the photoelectric conversion module, the wavelength division multiplexing module 2 and the combining port 2, and the combining port 2 of the transmission node X sequentially passes through the combining port 1 of the transmission node x+1, the wavelength division multiplexing module 1 and the photoelectric conversion module and is connected to the bypass port 1 of the switch board 1 of the transmission node x+1, so as to construct a standby path of the main path between the switch board 1 and the switch board 2, and redundant protection is performed on the main path. The standby path between the exchange board n of the transmission node X and the exchange board n of the transmission node x+1 carries out mutual conversion of the ethernet electrical signal and the optical signal with the wavelength of λn through the photoelectric conversion module, the optical signal with the wavelength of λn is combined in the combining link for transmission through the wavelength division multiplexing module, and the combined optical signal is separated through the wavelength division multiplexing module and transmitted to the corresponding port of the photoelectric conversion module.
Two groups of bypass control ports of the main control board are connected to the combining module and are connected to the combining links of the adjacent transmission nodes through the combining module. Illustratively, the bypass control port 2 of the main control board of the transmission node X is connected to the combining port 1 of the transmission node x+1 through the photoelectric conversion module, the wavelength division multiplexing module 2, and the combining port 2, and sequentially connected to the bypass control port 1 of the main control board of the transmission node x+1 through the wavelength division multiplexing module 1 and the photoelectric conversion module of the transmission node x+1. The main control board of the transmission node X and the main control board of the transmission node X+1 are mutually converted by the photoelectric conversion module, the optical signals with the wavelength of lambda 0 are combined at a combining link for transmission by the wavelength division multiplexing module, and the combined optical signals are separated by the wavelength division multiplexing module and transmitted to the corresponding ports of the photoelectric conversion module.
The present invention proposes a control method of a system for automatically protecting a data plane link by using a control plane link, as shown in a flowchart of fig. 4.
Step 1: the controller collects topology information of the whole network based on SDN basic principles, including information such as transmission nodes, network ports, link interconnection and the like. In addition, the transmitting node also reports bypass port information corresponding to the network port.
Note that the bypass port and the network port of the switch board are both logically ethernet ports, with the difference that the network port is on the face plate and the bypass port is connected to the backplane bypass channel. They can thus both be reported to the controller by the transmitting node in the topology collection phase according to the SDN philosophy, with the difference that the transmitting node shall additionally report the corresponding information of the network port and the bypass port, e.g. network port 1 corresponds to bypass port 1 and network port 2 corresponds to bypass port 2.
Step 2: the controller issues data forwarding flow list items to each transmission node through a control plane in the combining link according to the planning of the user on the service, and establishes a main path in the data plane for the service.
That is, the controller issues the data forwarding flow table item to the main control board through the combined link, and sends control to the corresponding exchange board through the main control board, so as to control the exchange boards between adjacent transmission nodes to establish a main path for service transmission. Illustratively, the controller issues data forwarding flow entries through control planes in the combined link facing the master control board of the transmitting node X and the master control board of the transmitting node x+1. The master control board of the transmission node X controls the network port 2 of the switch board 1 of the transmission node X as a communication port of the switch board 1 of the transmission node X and the switch board 1 of the transmission node x+1, and the master control board of the transmission node x+1 controls the network port 1 of the switch board 1 of the transmission node x+1 as a corresponding communication port for communication with the switch board 1 of the transmission node X, thereby establishing a main path of the switch board 1 of the transmission node X and the switch board 1 of the transmission node x+1. Similarly, the master board of the transmission node X controls the network port 2 of the switch board n of the transmission node X as a communication port of the switch board n of the transmission node X and the switch board n of the transmission node x+1, and the master board of the transmission node x+1 controls the network port 1 of the switch board n of the transmission node x+1 as a corresponding communication port for communication with the switch board n of the transmission node X, thereby establishing a main path of the switch board n of the transmission node X and the switch board n of the transmission node x+1.
Step 3: the controller checks each network port used by the main path, issues a link protection flow table item according to the corresponding information of the network port and the bypass port, establishes a standby path by using the bypass channel and the combined link, and performs hop-by-hop redundancy protection on the main path.
The active path may include single-hop behavior or multi-hop behavior, with the standby path being standby protected hop-by-hop. For example, in fig. 3, for a hop in the active path from the network port 2 of the switch board 1 of the transmission node x to the network port 1 of the switch board 1 of the transmission node x+1, the corresponding hop in the standby path is: the bypass port 2 of the exchange board 1 of the transmission node x passes through the bypass channel and the combining port 2 of the combining module, and the combining port 1 of the combining module transmitted to the transmission node x+1 passes through the bypass channel and the bypass port 1 of the exchange board 1. As shown in fig. 7.
Step 4: the controller configures and binds corresponding link failure detection sessions for the active path and the standby path of the service, and the link failure detection can be based on an OAM (operation and maintenance management, operation Administration andMaintenance) protocol monitoring mechanism.
Step 5: when the fault detection session reports the fault of the primary path, the exchange board automatically cuts the service data stream to a corresponding one-hop of the standby path according to the stream list item for protection aiming at the one-hop of the link fault. The protection back-cut process does not require the participation of a controller.
A schematic diagram of the path when the fault undercut protection occurs is shown in fig. 7, for example. Assuming that a link failure occurs in a hop of the primary path, which is sent from the network port 2 of the switch board 1 of the transmission node x to the network port 1 of the switch board 1 of the transmission node x+1, the failure detection session reports failure information to the switch board, and the switch board automatically switches the hop of the service data flow to a corresponding hop in the following standby path according to the configuration of the data forwarding flow table entry and the link protection flow table entry: the bypass port 2 of the exchange board 1 of the transmission node x passes through the bypass channel and the combining port 2 of the combining module, and the combining port 1 of the combining module transmitted to the transmission node x+1 passes through the bypass channel and the bypass port 1 of the exchange board 1.
The controller creates a standby path by issuing a link protection flow table entry as a main path, and the exchange board automatically cuts the service data flow to a corresponding standby path one-hop according to the flow table entry for one-hop of the link failure to protect, and one embodiment of the specific implementation technology is as follows: referring to a fast_fault type group table (group table) in an SDN OpenFlow standard flow table protocol (version 1.1 and above), a new type group table is added to the OpenFlow protocol, and the embodiment is called a user_fault type group table. Similar to the fast_failover type group table is: the fast_failure type group table and the user_failure type group table both support carrying a plurality of action buckets (action buckets), and can determine which action bucket should be selected to execute currently according to a certain criterion. Unlike the fast_failover type group table is: the fast_failover type group table mainly supports the selective execution of the action bucket according to the port fault condition, and the user_failover type group table extends the fast_failover type group table to the selective execution of the action bucket according to the fault type customized by external software.
As shown in Table 1, the group entries of the user_failure Type group table are of Type extended user_failure, and each action bucket contains a watch_failure entry for specifying the detected failure location and event. In this example, action bucket 1 corresponds to the active path (from network port 2 of switch board 1 of transfer node x) and action bucket 2 corresponds to the standby path (from bypass port 2 of switch board 1 of transfer node x). The watch_failure content of the action bucket 1 is that the data plane link is detected to be normal, and when the data plane link is not failed, the group table selects to execute the action bucket 1, namely, forwards the data flow to the network port 2 of the switch board 1 with the out_port being the transmission node x, and enters the main path. The watch_failure content of the action bucket 2 is that a data plane link failure is detected, and when the failure is detected, the group table selects to execute the action bucket 2, that is, forward the data stream to the bypass port 2 of the switch board 1 with out_port being the transmission node x, and enter the standby path.
Table 1user_failover type group table entry (extension type one)
Since the Openflow group table sequentially checks whether the watch_failure content is satisfied according to the action bucket order, the action bucket 1 (active path) is always preferentially used in the above group table extension mode. When the primary path fails, the data stream is automatically switched back to the active barrel 2 (standby path) according to the group table, and when the primary path is restored, the data stream is automatically switched back to the primary path according to the sequence of the active barrel.
In some application scenarios, there may be more diversified demands on the main-standby path switching mode, for example:
1. when the main path is in fault, firstly checking a user parameter of 'automatic switching switch', if the switch is opened, switching the data stream to the standby path, otherwise, not automatically switching;
2. when the main path is recovered after failure, the data flow is firstly waited for a certain time and then is switched back to the main path, and the time is called as a delayed switching time (wait_to_reverse time);
3. when the main path is recovered after failure, the data flow is not necessarily switched back to the main path, but the data flow is determined to be switched back to the main path or to stay on the standby path according to a user parameter switch 'reversible' (reverse);
4. the user may be required to manually issue an instruction to manually specify that the data stream be forced to be reversed onto the active Path or onto the standby Path, referred to as a "manual reversed onto active/standby Path" (Manual Revert toWork/protection Path) instruction.
At this time, another example may be taken as follows: as shown in table 2, the group entry of the user_failure type group table in the second extension manner is replaced by the watch_failure, that is, whether the action bucket is executed is not determined according to the failure any more, but the Flag bit Flag corresponding to the action bucket is checked, if Flag is 1, the action bucket is executed, and if Flag is 0, the action bucket is not executed. The Flag can be set by an external control software module, the diversified requirements can be realized by adding more logic in external software, and the flexibility of functions is greatly improved.
Table 2user_failover type group table entry (extension mode two)
After the external control software module processes according to various inputs, a schematic block diagram of the output set user_failover type group table Flag bit Flag is shown in fig. 5: the input event of the external control software comprises the detection of the data link fault and the detection of the recovery of the data link, the input parameters of the external control software module comprise an automatic switching switch, a delayed switching time and reversibility, the instruction input of the external control software comprises the manual switching to a main path and the manual switching to a standby path, the external control software module determines to output and sets a user_fault type group table through the input, and the user_fault type group table comprises Flag1 and Flag2.
The process flow diagram of the external control software module for diversification is shown in fig. 6, wherein Flag1 is set to 1 and Flag2 is set to 0 to select the primary path, and Flag1 is set to 0 and Flag2 is set to 1 to select the backup path.
Judging whether to manually switch to the standby path when Flag1 is set to 1 and Flag2 is set to 0, and if so, performing Flag1 set to 0 and Flag2 set to 1; if Flag1 is set to 1 and Flag2 is set to 0, judging that the switching to the standby path is not performed manually, and detecting whether a data link fails or not; when the failure of the data link is detected, whether the automatic reverse switch is opened is detected, and when the automatic reverse switch is detected to be opened, operations of setting 0 to Flag1 and setting 1 to Flag2 are performed.
After performing Flag1 to be set to 0 and Flag2 to be set to 1, judging whether to perform manual back cutting to a main path or not; when judging that the main path is manually reversed, performing operations of setting 1 Flag1 and setting 0 Flag2, and when judging that the main path is not manually reversed, detecting whether the data link is recovered to be normal; when the data link is detected not to be recovered to be normal, the operations of setting 0 to Flag1 and setting 1 to Flag2 are executed again, and when the data link is detected to be recovered to be normal, whether an automatic back-cut switch is opened or not is detected; after detecting that the automatic back-cut switch is not opened, performing operations of setting Flag1 to 0 and setting Flag2 to 1 again, and after detecting that the automatic back-cut switch is opened, detecting whether the reversibility is 1; when the reversibility is not 1, performing operations of setting Flag1 to 0 and setting Flag2 to 1 again, and when the reversibility is 1, detecting whether the delayed back-cutting time is 0; when the postponed switching time is detected to be 0, performing operations of Flag1 setting 1 and Flag2 setting 0, and when the postponed switching time is detected to be not 0, waiting for corresponding time, and performing operations of Flag1 setting 1 and Flag2 setting 0.
In a conventional SDN, a controller issues a data forwarding flow table entry to a main control board of a transmitting node through a control plane, and the main control board configures the data forwarding flow table entry into a switch board to control a data transmission behavior of the switch board on the data plane, for example, a single-hop behavior of a certain service is specified: the service data stream is sent out from the network port 2 of the switch board 1 of the transmission node x and transmitted to the network port 1 of the switch board 1 of the transmission node x+1; when multiple single-hop behaviors of the service are specified to form a multi-hop behavior, one transmission path (path) of the service in the SDN is specified.
In the invention, the controller establishes a transmission path for the service transmitting data forwarding flow table item, and also transmits a corresponding link protection flow table item, a standby path is established in the original control plane link resource (the current combined link), and the control plane link resource is utilized to provide redundant protection for the main path in the data plane link.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (16)
1. A method for automatically protecting a data plane link using a control plane link, the method comprising:
collecting topology information of the whole network through a controller;
establishing a main path of service exchange between transmission nodes in a data plane link, and establishing a standby path of service exchange between transmission nodes;
combining the standby path with the control surface link to construct a combined link, wherein a bypass channel of the standby path and the main control board perform photoelectric conversion work through a photoelectric conversion module, an electric signal is converted into an optical signal with a specific wavelength to be independently transmitted, and then the independently transmitted optical signal with the specific wavelength is combined through a wavelength division multiplexing module to be transmitted in an optical line; and transmitting to a wavelength division multiplexing module of an adjacent transmission node; the wavelength division multiplexing module of the adjacent station divides a single optical line, divides the single optical line into a plurality of lines according to the wavelength of an optical signal in the single optical line, outputs the optical signal to a corresponding photoelectric conversion module, converts the optical signal into an electric signal again through the photoelectric conversion module, and sends the electric signal to a main control board and a switching board respectively;
detecting the link fault condition of the main path and the standby path;
and automatically performing the switching action of the main path and the standby path according to the link fault condition.
2. The method for automatically protecting a data plane link with a control plane link according to claim 1, wherein the full network topology information includes transport node information, network port information, and link interconnect information.
3. The method for automatically protecting a data plane link with a control plane link according to claim 2, wherein the transfer node information includes bypass port information corresponding to a network port.
4. A method for automatically protecting a data plane link using a control plane link according to any one of claims 1 to 3, wherein said controller establishes said active path by a control plane issuing a data forwarding flow table entry to each of said transmitting nodes, said controller issuing a link protection flow table entry to establish said standby path.
5. The method for automatically protecting a data plane link using a control plane link according to claim 4, wherein the link protection flow entry is issued according to network port correspondence information of the primary path and bypass port correspondence information of the backup path.
6. The method for automatically protecting a data plane link using a control plane link according to claim 1, wherein the active path performs a single-hop or multi-hop operation, and the standby path performs a hop-by-hop redundancy protection for the active path.
7. The method for automatically protecting a data plane link with a control plane link according to claim 1, wherein the backup path and the control plane link establish a combined link by a wavelength division multiplexing technique.
8. The method of claim 1, wherein the controller coordinates and binds corresponding link failure detection sessions for the primary path and the backup path, and detects a link failure condition through a link failure detection session.
9. The method for automatically protecting a data plane link using a control plane link according to claim 8, wherein when the failure detection session reports a failure of a primary path, for a hop where a link failure occurs, the switch board automatically switches the traffic data flow to a corresponding hop of a backup path according to the flow entry for protection.
10. A system for automatically protecting data-plane links using control-plane links, comprising data-plane links connected between switching boards of adjacent transport nodes as the primary paths for traffic exchange between transport nodes;
the switching board is connected to the combining module through the bypass channel, and a combined link is connected between the combining modules of adjacent transmission nodes and is used as a standby path for service exchange between the transmission nodes through the bypass channel and the combined link;
the main control board in the transmission node is connected with the combining module, and the standby path and the control surface link are connected to the combining link in a combining way through the combining module;
the bypass channel of the standby path and the main control board perform photoelectric conversion through the photoelectric conversion module, the electric signals are converted into optical signals with specific wavelengths to be independently transmitted, and then the independently transmitted optical signals with specific wavelengths are combined and transmitted in an optical line through the wavelength division multiplexing module; and transmitting to a wavelength division multiplexing module of an adjacent transmission node; the wavelength division multiplexing module of the adjacent station divides a single optical line, divides the single optical line into a plurality of lines according to the wavelength of an optical signal in the single optical line, outputs the optical signal to a corresponding photoelectric conversion module, converts the optical signal into an electric signal again through the photoelectric conversion module, and sends the electric signal to a main control board and a switching board respectively.
11. The system for automatically protecting a data plane link using a control plane link according to claim 10, wherein the switch boards include a network port through which the data plane link is connected between switch boards of two adjacent sets of transport nodes and a bypass port through which the switch boards are connected to a bypass path, the bypass path being connected to a combiner module.
12. The system for automatically protecting a data plane link with a control plane link according to claim 11, wherein said switch board includes at least two sets of network ports through which traffic data is exchanged.
13. The system for automatically protecting a data plane link with a control plane link according to claim 12, wherein said switch board includes at least two sets of bypass ports, said bypass ports being in one-to-one correspondence with said network ports.
14. The system for automatically protecting a data plane link using a control plane link according to claim 11, wherein the network port and the bypass port each employ an ethernet port.
15. The system for automatically protecting a data plane link by using a control plane link according to any one of claims 10 to 14, wherein the combining module comprises a photoelectric conversion module, a wavelength division multiplexing module and a combining port, the photoelectric conversion module is connected with the wavelength division multiplexing module, the wavelength division multiplexing module is connected with the combining port, and the combining modules of two adjacent groups of transmission nodes are connected with the combining link through the combining port;
the photoelectric conversion module has a bidirectional function and is used for carrying out mutual conversion of an optical signal line and an electric signal line with specific wavelengths;
the wavelength division multiplexing module has a bidirectional function and performs interconversion between a plurality of optical lines and one optical line.
16. The system for automatically protecting a data plane link using a control plane link according to any one of claims 10 to 14, wherein the bypass channel is provided on a backplane.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106789630A (en) * | 2016-12-30 | 2017-05-31 | 瑞斯康达科技发展股份有限公司 | A kind of network protection method and system, controller, equipment |
| CN107302496A (en) * | 2017-05-26 | 2017-10-27 | 重庆邮电大学 | A kind of software defined network link failure recovery method based on band control |
| CN107637027A (en) * | 2015-05-29 | 2018-01-26 | 瑞典爱立信有限公司 | The communication between base station in radio access network |
| CN108270669A (en) * | 2016-12-30 | 2018-07-10 | 中兴通讯股份有限公司 | Business recovery device, master controller, the system and method for SDN network |
| CN209930282U (en) * | 2019-04-23 | 2020-01-10 | 北京全路通信信号研究设计院集团有限公司 | System for automatically protecting data plane link by using control plane link |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101318156B1 (en) * | 2012-03-26 | 2013-10-15 | 주식회사 다산네트웍스 | Method for protection switching in ethernet ring network |
| US9712899B2 (en) * | 2014-12-11 | 2017-07-18 | Alcatel Lucent | Hybrid optical switch for software-defined networking |
-
2019
- 2019-04-23 CN CN201910330550.2A patent/CN110113258B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107637027A (en) * | 2015-05-29 | 2018-01-26 | 瑞典爱立信有限公司 | The communication between base station in radio access network |
| CN106789630A (en) * | 2016-12-30 | 2017-05-31 | 瑞斯康达科技发展股份有限公司 | A kind of network protection method and system, controller, equipment |
| CN108270669A (en) * | 2016-12-30 | 2018-07-10 | 中兴通讯股份有限公司 | Business recovery device, master controller, the system and method for SDN network |
| CN107302496A (en) * | 2017-05-26 | 2017-10-27 | 重庆邮电大学 | A kind of software defined network link failure recovery method based on band control |
| CN209930282U (en) * | 2019-04-23 | 2020-01-10 | 北京全路通信信号研究设计院集团有限公司 | System for automatically protecting data plane link by using control plane link |
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