CN112543143A - Method, chip, equipment and storage medium for multicast service fast protection switching - Google Patents
Method, chip, equipment and storage medium for multicast service fast protection switching Download PDFInfo
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- CN112543143A CN112543143A CN202011372084.3A CN202011372084A CN112543143A CN 112543143 A CN112543143 A CN 112543143A CN 202011372084 A CN202011372084 A CN 202011372084A CN 112543143 A CN112543143 A CN 112543143A
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- H—ELECTRICITY
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- 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
- H04L45/16—Multipoint 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
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Abstract
The invention discloses a method, a chip, a device and a storage medium for fast protection switching of multicast services, wherein the method is applied to a switching chip of network equipment, the switching chip stores a multicast member table, the multicast member table comprises all main ports of a multicast group and a protection port corresponding to each main port, and the method comprises the following steps: performing polling detection on all main ports of the multicast group; when a fault of a main port is detected, the multicast service of the main port is switched to a corresponding backup port, and the flag bit of the working port in the multicast member table is updated. Compared with the prior art, the method for fast protection switching of the multicast service directly switches the multicast service to the backup port configured in advance by the user after detecting the failure of the main port through the automatic protection switching linkage technology of the switching chip, thereby greatly shortening the time of protection switching of the whole multicast service and simultaneously reducing the expenditure of a CPU module.
Description
Technical Field
The present invention relates to the field of network communications, and in particular, to a method, a chip, a device, and a storage medium for fast protection switching of multicast services.
Background
At present, broadband technology has been widely applied, and with the continuous expansion of the application range of broadband and the rapid increase of the number of broadband users, multicast service has become an important means for operators to attract users. Multicast is a service that can be reached as much as possible, there are no many detection protection mechanisms, and when a broadcast and television company uses a multicast technology in the face of the currently increasingly widely applied multicast service, such as IPTV (internet protocol TV, network television), if a fault or packet loss occurs on a multicast link, all user terminals may not receive data in a short time, which greatly affects the user terminals.
The protection switching technology is a main means for ensuring the reliability of a network, provides certain network redundancy, and transfers traffic to a standby path when the network fails, thereby ensuring that services can be quickly recovered. With the increasing requirements on network quality, the requirements on protection switching during failure are gradually increased.
Currently, the protection switching of multicast is executed by a CPU module of a network device, and specifically, the CPU module detects a port state of a multicast service and makes a decision on the protection switching of the multicast service. However, because there are many other processes to be processed in the CPU module, the protection switching of multicast cannot be processed in time, and the speed of multicast protection switching is affected, so that the requirement of a client on fast switching of multicast services cannot be met.
Disclosure of Invention
The invention aims to provide a method, a chip, equipment and a storage medium for fast protection switching of multicast services.
In order to achieve one of the above objects, an embodiment of the present invention provides a method for fast protection switching of multicast services, where the method is applied to a switch chip of a network device, the switch chip stores a multicast member table, and the multicast member table includes all main ports of a multicast group and a protection port corresponding to each main port, and the method includes:
performing polling detection on all main ports of the multicast group;
when a fault of a main port is detected, the multicast service of the main port is switched to a corresponding backup port, and the flag bit of the working port in the multicast member table is updated.
As a further improvement of an embodiment of the present invention, the method further comprises:
and informing the CPU module through interruption, and reporting the multicast protection switching event to the user by the CPU module.
As a further improvement of an embodiment of the present invention, the method further comprises:
and receiving the multicast port backup configuration transmitted by the CPU module, analyzing the multicast port backup configuration and storing the analyzed multicast port backup configuration into a multicast member table.
As a further improvement of an embodiment of the present invention, the method further comprises:
receiving a multicast service switching back mark sent by a CPU module, and storing the multicast service switching back mark into a multicast member table;
and after the multicast protection switching occurs and the failed main port is recovered to be normal, controlling whether the multicast service is switched back or not according to the multicast service switching back mark.
As a further improvement of an embodiment of the present invention, the "controlling whether or not the multicast service is switched back according to the multicast service switching back flag" includes:
when the multicast service switching-back mark is 1, after the main port which detects the fault is recovered to be normal, directly switching the multicast service from the backup port to the main port, and updating the working port mark bit of the multicast member table;
when the multicast service switching-back mark is 0, after the main port with the fault is recovered to be normal, the multicast service is switched back to the main port from the backup port only after the switching-back configuration sent by the CPU module is received, and the working port mark bit of the multicast member table is updated.
As a further improvement of an embodiment of the present invention, the working port flag bit is set to 0 by default, where 0 indicates that the primary port is working, and 1 indicates that the backup port is working.
As a further improvement of an embodiment of the present invention, the "detecting a failure of a certain main port" specifically includes:
it is detected that the link state of a certain main port is changed from UP to DOWN.
In order to achieve one of the above objects, an embodiment of the present invention provides a switch chip, where the switch chip is disposed on a network device, the switch chip stores a multicast member table, the multicast member table includes all main ports of a multicast group, a protection port corresponding to each main port, and a working port flag, and the switch chip is configured to:
performing polling detection on all main ports of the multicast service;
when a fault of a main port is detected, the multicast service of the main port is switched to a corresponding backup port, and the flag bit of the working port in the multicast member table is updated.
In order to achieve one of the above objects, an embodiment of the present invention provides an electronic device, which includes a memory and a processor, where the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the processor implements any one of the steps in the method for fast protection switching of multicast services.
To achieve one of the above objects, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in any one of the above methods for multicast service fast protection switching.
Compared with the prior art, the method for fast protection switching of the multicast service directly realizes the multicast protection switching which is discovered and processed by the CPU module originally by the switching chip, and directly switches the multicast service to the backup port which is configured in advance by the user after detecting the failure of the main port by the automatic protection switching linkage technology of the switching chip, thereby greatly shortening the time of the protection switching of the whole multicast service and simultaneously reducing the expense of the CPU module.
Drawings
Fig. 1 is an example of an anchor member table stored in the switch chip of the present invention.
Fig. 2 is a flow chart of the method for fast protection switching of multicast services according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
In the prior art, a CPU module of a network device reads a port link state by means of timed polling (usually 200ms or longer), interrupt or message sending, and detects whether the port link state of a multicast service changes. After detecting that the port link state of the multicast service changes, the CPU module finds the aggregation group to which the port belongs, the aggregation group decision module makes a switching decision whether to execute protection according to the current main port state, and sends the switching decision to the aggregation group service support module to execute switching.
The switching scheme of the multicast service has the following problems:
(1) because the detection of the port and the decision module of the aggregation group are realized by the CPU module, the CPU module can acquire the port state only by a polling or interrupt mode. Considering that the CPU module has many other processes to process serially, the normal polling period needs to be set to 200ms or more. If the interruption mode is used, when the port link of the multicast service vibrates, a large amount of interruption is generated, so that the occupancy rate of a CPU module is too high, and the normal processing of other processes is influenced;
(2) after the CPU module obtains the port fault, it needs to search for the corresponding aggregation group, and then makes a decision according to the situation, and refreshes the hardware forwarding table entry. This process also takes a certain amount of time.
Due to the above reasons, the overall time of the protection switching of the multicast service is long, and the requirement of the fast protection switching of the multicast service proposed by the client cannot be met.
Therefore, the present invention provides a switching chip, which is disposed on a network device, and can implement automatic protection switching of multicast services in addition to a normal packet switching function. By using the switching chip, the original multicast protection switching discovered and processed by the CPU module is directly processed by the switching chip, and the multicast service is directly switched to the backup port configured in advance by the user after the failure of the main port is detected by the automatic protection switching linkage technology of the switching chip, so that the time of the whole multicast service protection switching is greatly shortened, and the expense of the CPU module is also reduced.
Specifically, the switch chip stores a multicast member table, as shown in fig. 1, where the multicast member table includes all main ports of a multicast group, a protection port corresponding to each main port, and a working port flag. The working port flag bit is used for representing that port is working, the default of the working port flag bit is 0, the working port flag bit is 0 to indicate that the main port is working, and the working port flag bit is 1 to indicate that the backup port is working. Under normal conditions, the exchange chip selects the main port to forward the multicast flow, and when the fault of the working port is detected, the exchange chip switches the multicast flow to the corresponding backup port.
In a preferred embodiment, the multicast member table further includes a multicast service switching-back flag, and after the multicast protection switching occurs and the failed main port returns to normal, whether the multicast service is switched back is controlled according to the multicast service switching-back flag. Specifically, when the multicast service switching-back flag is 1, after the main port detected to be faulty returns to normal, the multicast service is directly switched back to the main port from the backup port, and the working port flag bit of the multicast member table is updated. When the multicast service switching-back mark is 0, after the main port with the fault is recovered to be normal, the multicast service is switched back to the main port from the backup port only after the switching-back configuration sent by the CPU module is received, and the working port mark bit of the multicast member table is updated.
Based on the switching chip, the invention also provides a method for fast protection switching of multicast services, which is applied to the switching chip (the method is an automatic protection switching linkage technology of the switching chip), and the switching chip realizes port detection and protection switching of the multicast services, thereby greatly shortening the time of protection switching of the whole multicast services and simultaneously reducing the expenditure of a CPU module.
As shown in fig. 2, the method includes:
step S100: and performing polling detection on all the main ports of the multicast group.
The switching chip polls all the main ports of the multicast group at regular time and detects whether the link of the main port fails, namely the link state of the main port is changed from UP to DOWN.
Step S200: when a fault of a main port is detected, the multicast service of the main port is switched to a corresponding backup port, and the flag bit of the working port in the multicast member table is updated.
After a main port of a certain multicast group fails, the multicast service of the main port is switched to a corresponding backup port, that is, before the main port fails, the switching chip forwards the multicast service through the main port, and after the main port fails, the switching chip forwards the multicast service through the backup port.
After the anchor service is switched, the flag bit of the working port is set to 1 by updating the flag bit of the working port in the multicast member table.
In a specific embodiment, the method further comprises:
and informing the CPU module through interruption, and reporting the multicast protection switching event to the user by the CPU module.
When the multicast service is subjected to protection switching, the switching chip informs the CPU module in an interruption mode, and the CPU module reports multicast protection switching to the user, so that the user can conveniently locate and overhaul the fault of the main port.
It should be noted that, the information of the multicast member table in the switch chip is issued to the CPU module by the user, and then issued to the switch chip by the CPU module. In a specific embodiment, the method further comprises: and receiving the multicast port backup configuration transmitted by the CPU module, analyzing the multicast port backup configuration and storing the analyzed multicast port backup configuration into a multicast member table.
After the protection switching occurs to the multicast service, if the failed main port is recovered to normal, whether the multicast service needs to be switched back to the main port is determined by a user, and therefore, in a preferred embodiment, the method further includes:
receiving a multicast service switching back mark sent by a CPU module, and storing the multicast service switching back mark into a multicast member table;
and after the multicast protection switching occurs and the failed main port is recovered to be normal, controlling whether the multicast service is switched back or not according to the multicast service switching back mark. Specifically, the method comprises the following steps:
when the multicast service switching-back mark is 1, after the main port with the fault is recovered to be normal, the multicast service is directly switched back to the main port from the backup port, and the working port mark bit of the multicast member table is updated;
when the multicast service switching-back mark is 0, after the main port with the fault is recovered to be normal, the multicast service is switched back to the main port from the backup port only after the switching-back configuration sent by the CPU is received, and the working port mark bit of the multicast member table is updated.
In a specific embodiment, after receiving the multicast port backup configuration and the multicast service switching back flag about the multicast group 1 issued by the CPU module, the switch chip parses the multicast port backup configuration and the multicast service switching back flag and stores the parsed multicast port backup configuration and multicast service switching back flag into the multicast member table of the multicast group 1 (refer to fig. 1). Then the switching chip polls and detects all main ports (main ports A-I) of the multicast group 1 regularly, after finding that the link state of the main port A is changed from UP to DOWN, the main service is switched to the corresponding backup port A1, the flag position of the working port corresponding to the port is set to 1, then the CPU module is informed in an interruption mode, the main service protection switching event is reported to the user by the CPU module, and the user can conveniently and timely troubleshoot and recover the fault of the port. After the link state of the main port A is changed from DOWN to UP, the value of the multicast service switching-back mark is obtained from the multicast member list of the multicast group 1, when the value of the multicast service switching-back mark is found to be 1, the multicast service is directly switched back to the main port A from the backup port A1, and the value of the working port mark position corresponding to the main port is set to be 0.
The present invention further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program that can run on the processor, and the processor implements any one step in the method for fast protection switching of multicast services when executing the program, that is, implements a step in any one technical scheme in the method for fast protection switching of multicast services.
The present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements any one of the steps in the method for multicast service fast protection switching, that is, implements the steps in any one of the technical solutions in the method for multicast service fast protection switching.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for fast protection switching of multicast service is applied to a switch chip of a network device, the switch chip stores a multicast member table, the multicast member table includes all main ports of a multicast group and a protection port corresponding to each main port, the method includes:
performing polling detection on all main ports of the multicast group;
when a fault of a main port is detected, the multicast service of the main port is switched to a corresponding backup port, and the flag bit of the working port in the multicast member table is updated.
2. The method for multicast service fast protection switching according to claim 1, wherein the method further comprises:
and informing the CPU module through interruption, and reporting the multicast protection switching event to the user by the CPU module.
3. The method for multicast service fast protection switching according to claim 1, wherein the method further comprises:
and receiving the multicast port backup configuration transmitted by the CPU module, analyzing the multicast port backup configuration and storing the analyzed multicast port backup configuration into a multicast member table.
4. The method for multicast service fast protection switching according to claim 1, wherein the method further comprises:
receiving a multicast service switching back mark sent by a CPU module, and storing the multicast service switching back mark into a multicast member table;
and after the multicast protection switching occurs and the failed main port is recovered to be normal, controlling whether the multicast service is switched back or not according to the multicast service switching back mark.
5. The method of claim 4, wherein the step of controlling whether the multicast service is switched back according to the multicast service switching back flag comprises:
when the multicast service switching-back mark is 1, after the main port which detects the fault is recovered to be normal, directly switching the multicast service from the backup port to the main port, and updating the working port mark bit of the multicast member table;
when the multicast service switching-back mark is 0, after the main port with the fault is recovered to be normal, the multicast service is switched back to the main port from the backup port only after the switching-back configuration sent by the CPU module is received, and the working port mark bit of the multicast member table is updated.
6. The method for multicast service fast protection switching according to claim 1, wherein:
the default of the working port flag bit is 0, wherein 0 indicates that the main port is working, and 1 indicates that the backup port is working.
7. The method of claim 1, wherein the "detecting a failure of a main port" specifically comprises:
it is detected that the link state of a certain main port is changed from UP to DOWN.
8. An exchange chip, the exchange chip is set on a network device, characterized in that, the exchange chip stores a multicast member table, the multicast member table includes all main ports of a multicast group, a protection port corresponding to each main port, and a working port flag bit, the exchange chip is configured to:
performing polling detection on all main ports of the multicast service;
when a fault of a main port is detected, the multicast service of the main port is switched to a corresponding backup port, and the flag bit of the working port in the multicast member table is updated.
9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor executes the program to implement the steps in the method for multicast service fast protection switching according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the steps in the method for multicast service fast protection switching according to any one of claims 1 to 7.
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| CN114465878A (en) * | 2022-02-28 | 2022-05-10 | 中国工商银行股份有限公司 | Service port switching method and device |
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