CN106470153B - method and device for preventing temporary loop - Google Patents
method and device for preventing temporary loop Download PDFInfo
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- CN106470153B CN106470153B CN201610807851.6A CN201610807851A CN106470153B CN 106470153 B CN106470153 B CN 106470153B CN 201610807851 A CN201610807851 A CN 201610807851A CN 106470153 B CN106470153 B CN 106470153B
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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
- H04L45/18—Loop-free operations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
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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
- H04L45/24—Multipath
- H04L45/245—Link aggregation, e.g. trunking
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Abstract
The application provides a method and a device for preventing a temporary loop, wherein the method is applied to a network device, the network device comprises at least one link aggregation group which enables a ring network protocol, and the method comprises the following steps: recording the member port to be deleted in the link aggregation group and the state of the member port; deleting the member port from the link aggregation group, and keeping the member port in a closed state before the member port successfully starts a ring network protocol based on the recorded state of the member port; and starting a ring network protocol on the member port, and executing state recovery on the member port according to the recorded state of the member port. In the embodiment of the application, the deleted member device in the aggregation group is always in a closed state within the time slot from the deletion of the aggregation group to the successful start of the ring network protocol, so that the generation of a temporary loop is avoided.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for preventing a temporary loop.
Background
In the switching network, the loop can cause the circulation and proliferation of messages in the loop, and a broadcast storm is generated, so that all effective bandwidth is occupied, and the network is unavailable. In this case, the ring network protocol can achieve the purpose of eliminating the network loop by selectively blocking the network redundant link. The ring network protocol supports link aggregation, and if the configuration of the link aggregation changes, the ring network protocol needs to respond and carry out state switching, so as to ensure that no loop is generated in a switching network.
in the prior art, when the configuration of the link aggregation group changes and a member port needs to be deleted, a ring network protocol is usually enabled on the deleted member port in the link aggregation group.
however, since there is a time gap between the deletion of the member port in the aggregation group and the successful activation of the ring network protocol, within the time gap, the member port does not belong to the aggregation group nor activate the ring network protocol, and thus a temporary loop may still be generated.
Disclosure of Invention
In view of the above, the present application provides a method and an apparatus for preventing a temporary loop, which are used to solve the problem that a temporary loop may be generated in the time slot from the deletion of the member port in the aggregation group to the successful activation of the ring network protocol.
specifically, the method is realized through the following technical scheme:
a method for preventing temporary loop, applied to a network device, the network device including at least one link aggregation group which enables ring network protocol, includes:
recording the member port to be deleted in the link aggregation group and the state of the member port;
Deleting the member port from the link aggregation group, and keeping the member port in a closed state before the member port successfully starts a ring network protocol based on the recorded state of the member port;
and starting a ring network protocol on the member port, and executing state recovery on the member port according to the recorded state of the member port.
In the method for preventing a temporary loop, the recording the member port to be deleted in the link aggregation group and the status of the member port includes:
Acquiring a member port to be deleted in the link aggregation group and the current state of the member to be deleted;
and generating the corresponding relation between the member port to be deleted and the state of the member port, and recording the corresponding relation into a preset linked list.
In the method for preventing the temporary loop, the recording the corresponding relationship into a preset linked list includes:
and emptying the preset linked list before recording the corresponding relation between the member ports and the states of the member ports.
In the method for preventing temporary loops, the maintaining the member port in a closed state based on the recorded state of the member port includes:
reading the recorded state of the member port before deleting the member port from the link aggregation group;
and if the state of the member port is the opening state, closing the member port.
The performing state recovery on the member port according to the recorded state of the member port includes:
Reading the recorded state of the member port;
And if the state of the member port is the opening state, opening the member port.
In the method for preventing a temporary loop, comprising:
the ring network protocol comprises a spanning tree protocol STP or a fast ring network recovery protocol FRRP.
An apparatus for preventing temporary loop, applied to a network device, the network device including at least one link aggregation group which enables ring network protocol, comprising:
A recording unit, configured to record a member port to be deleted in the link aggregation group and a state of the member port;
A deleting unit, configured to delete the member port from the link aggregation group, and keep the member port in a closed state before the member port successfully enables a ring network protocol based on the recorded state of the member port;
And the starting unit is used for starting a ring network protocol on the member port and executing state recovery on the member port according to the recorded state of the member port.
In the device for preventing a temporary loop, the recording unit is further configured to:
Acquiring a member port to be deleted in the link aggregation group and the current state of the member to be deleted;
and generating the corresponding relation between the member port to be deleted and the state of the member port, and recording the corresponding relation into a preset linked list.
In the device for preventing a temporary loop, the recording unit is further configured to:
and emptying the preset linked list before recording the corresponding relation between the member ports and the states of the member ports.
In the device for preventing a temporary loop, the recording unit is further configured to:
reading the recorded state of the member port before deleting the member port from the link aggregation group;
And if the state of the member port is the opening state, closing the member port.
the enabling unit is further configured to:
Reading the recorded state of the member port;
and if the state of the member port is the opening state, opening the member port.
in the device for preventing a temporary loop, comprising:
the ring network protocol comprises a spanning tree protocol STP or a fast ring network recovery protocol FRRP.
In the embodiment of the invention, when the link aggregation group changes, the member port to be deleted in the link aggregation group and the state of the member port are recorded. And then deleting the member port from the link aggregation group, and keeping the member port in a closed state before the ring network protocol is started based on the recorded state of the member port. And then starting a ring network protocol on the member port, and executing state recovery on the member port according to the recorded state of the member port. In this embodiment, because the member port deleted by the link aggregation group is always in the closed state before the ring network protocol is started; therefore, the temporary loop generated by the member port before the ring network protocol is started can be effectively avoided.
drawings
FIG. 1 is a schematic diagram of a link aggregation group;
FIG. 2 is a flow chart illustrating a method of preventing temporary loops;
FIG. 3 is a logic block diagram of an apparatus for preventing temporary loops shown herein;
Fig. 4 is a hardware configuration diagram of an apparatus for preventing a temporary loop according to the present application.
Detailed Description
in order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the following description of the prior art and the technical solutions in the embodiments of the present invention with reference to the accompanying drawings is provided.
referring to fig. 1, fig. 1 is a schematic diagram of a link aggregation group.
as shown in fig. 1, ports 1 and 2 are configured as aggregation group a and ports 3 and 4 are configured as aggregation group B. A data link is formed between aggregation group a and aggregation group B. The aggregation group A and the aggregation group B both use a ring network protocol, wherein the ring network protocol can be any one of a spanning tree protocol or a fast ring network recovery protocol.
the link aggregation group changes, and there are two forms:
First, the entire aggregation group is cancelled: the aggregation group a and the aggregation group B are deleted, and at this time, the ring network protocols on the aggregation group a and the aggregation group B fail because the aggregation group a and the aggregation group B do not exist. The ring network protocol is started on the member port. Port 1, port 2, port 3 and port 4 are enabled with the ring protocol after the aggregation group a and the aggregation group B are deleted to prevent the temporary loop from being generated.
Second, some of the member ports of the aggregation group are deleted in the aggregation group: port 1 is removed from aggregation group a, at which point the ring protocol on port 1 fails because port 1 is not within aggregation group a. To prevent port 1 from creating a temporary loop, the ring protocol is enabled on port 1.
Therefore, when the link aggregation group changes, after the member port of the aggregation group is deleted by the aggregation group, the ring network protocol is started on the member port, so that the data message is prevented from continuously circulating and proliferating in the loop due to the generation of a temporary loop, and a broadcast storm is prevented.
However, there is a time gap between the deletion of the aggregation group and the successful ring network protocol activation, and within this time gap, the member port does not belong to the aggregation group nor activate the ring network protocol, so a temporary loop may be generated.
in order to solve the above problem, in the technical solution of the embodiment of the present invention, the member port is kept in the closed state within the time interval from the deletion of the member port from the aggregation group to the start of the ring network protocol on the member port, thereby preventing a temporary loop from being generated on the member port.
Referring to fig. 2, a flowchart of a method for preventing a temporary loop is shown, where an execution main body of the embodiment is a network device, the network device includes at least one link aggregation group that enables a ring network protocol, and the method includes the following steps:
Step 201: and recording the member port to be deleted in the link aggregation group and the state of the member port.
step 202: and deleting the member port from the link aggregation group, and keeping the member port in a closed state before the member port successfully enables the ring network protocol based on the recorded state of the member port.
Step 203: and starting a ring network protocol on the member port, and executing state recovery on the member port according to the recorded state of the member port.
As described above, in the prior art, the deleted member port in the link aggregation group of the network device does not belong to the aggregation group nor does it enable the ring network protocol within the time slot from the deletion of the aggregation group to the successful enabling of the ring network protocol, and therefore a loop may still be generated.
In this example, in an initial state, after the network device is started, a link aggregation protocol may be enabled on a plurality of locally specified ports, and then the plurality of ports are configured as a link aggregation group based on the link aggregation protocol, where the plurality of ports are all member ports in the link aggregation group.
in practical application, a plurality of link aggregation groups can be configured for network equipment based on service requirements, in addition, in order to prevent the link aggregation groups from generating temporary loops, a ring network protocol can be started on a logic port of each link aggregation group; such as a spanning tree protocol.
in this example, when a user needs to delete a certain member port of the aggregation group from the aggregation group, or any member port in the aggregation group fails, which results in that the member port needs to be deleted from the aggregation group, the member port to be deleted and the state of the member port before being deleted from the aggregation group may be recorded.
In an embodiment shown, a linked list may be set, and the state of the member port to be deleted is recorded on the linked list.
In implementation, each link aggregation group has a structure for storing information related to the aggregation group. In this example, a linked list may be set in the structure, and the member port to be deleted and the state of the member port when the aggregation group changes are recorded in the linked list.
each storage node in the linked list may be used to record a member port to be deleted and the state of the member port.
On one hand, when recording the member port to be deleted, the port number of the member port can be written into the corresponding node in the linked list.
On the other hand, when recording the state of the deleted member port, a corresponding flag bit may be added to each node of the linked list, and the added flag bit is used to record the current state of the member port to be deleted. The state of the member port may generally include: an on state and an off state.
When the configuration of the link aggregation group changes, the linked list may be emptied before recording the deleted member port and the state of the member port. Through the measure, the misoperation of the port of the network equipment caused by the fact that the prior member port information is stored in the linked list can be avoided. For example, the following steps: the member port which has been deleted last time and successfully started the ring network protocol is currently in a closed state. However, if the member port is recorded as being opened in the linked list, the member port may be opened in this operation with the member port as an operation object.
In this embodiment, when a link aggregation group changes, a member port to be deleted in the link aggregation group and a state of the member port may be recorded.
there are two cases in which the link aggregation group changes:
The first method is as follows: the entire aggregation group is deleted, i.e., all member ports in the aggregation group are deleted. At this time, the port numbers of all the member ports of the aggregation group and the states of the member ports before being deleted by the aggregation group may be sequentially obtained.
and generating a corresponding relation between the acquired port number of the member port and the state of the member port, and recording the corresponding relation into a preset linked list.
The second method is as follows: part of member ports in the aggregation group are deleted, and at this time, the port number of the member port to be deleted and the current state of the member port can be acquired.
and generating a corresponding relation between the acquired port number of the member port and the state of the member port, and recording the corresponding relation into a preset linked list.
The above-mentioned linked list is only a feasible way shown in this embodiment, and the above-mentioned recording function may also be implemented in other ways in the present application, which is not described herein again.
In this embodiment, in order to prevent the member port from generating a temporary loop before the ring network protocol is successfully enabled after the member port is deleted from the aggregation group, when the member port is deleted from the link aggregation group, the member port may be kept in a closed state before the member port successfully enables the ring network protocol based on the recorded state of the member port.
in implementation, before deleting the member port from the aggregation group, a node where the member port recorded in a preset linked list is located is searched, then a flag bit corresponding to the searched node is read, and then the state of the member port recorded in the flag bit is read.
on one hand, if the mark shows that the member port is in an open state, the member port is closed until the member port is recovered after the ring network protocol is successfully started.
On the other hand, if the flag indicates that the member port is in the closed state, the member port is not processed, in which case the member port will always be in the closed state.
Therefore, by the measures, the deleted member ports in the aggregation group can be ensured to be always in the closed state before the ring network protocol is successfully started. In the case that the entire aggregation group is deleted, after all member ports of the aggregation group are deleted, the ring network protocol of the logical port of the aggregation group may also be disabled because the aggregation group does not actually exist.
in this embodiment, when the member port has been deleted from the aggregation group, a ring network protocol is enabled on the member port, and according to the recorded state of the member port, state recovery is performed on the member port.
and when the member port is deleted by the aggregation group, starting a ring network protocol on the member port, wherein the ring network protocol can be a spanning tree protocol or a fast ring network recovery protocol. When the member port is enabled by the ring network protocol, no temporary loop is generated. At this time, the member port which is originally in the open state can be restored to the state so as to enable the member port to work normally.
in this embodiment, when the state of the member port is restored, the state of the member port may be read from the preset linked list, that is, the node where the member port is located is searched in the linked list, then the flag bit corresponding to the searched node is read, and the state of the member port before being deleted from the aggregation group is determined according to the read flag bit.
And if the state recorded by the member port in the linked list is an open state, opening the member port to enable the member port to work normally. And if the member port is in the closed state of the state recorded in the linked list, not operating the member port.
in summary, when a member port of an aggregation group is to be deleted, the state of the member port is recorded first, and the corresponding relationship between the member port and the state of the member port is stored; based on the recorded member port status, maintaining the member port in a closed state when the member port is deleted from the aggregation group; and after the member port successfully starts the ring network protocol, executing state recovery on the member port according to the saved state of the member port. In this embodiment, the member port from which the aggregation group is deleted is always in the closed state within the time slot from the deletion of the aggregation group to the successful activation of the ring network protocol, thereby effectively avoiding the possibility of generating a temporary loop.
corresponding to the embodiments of the method for preventing a temporary loop, the present application also provides embodiments of an apparatus for preventing a temporary loop.
Referring to fig. 3, a block diagram of an embodiment of the apparatus for preventing a temporary loop according to the present invention is shown:
As shown in fig. 3, the device 30 for preventing a temporary loop includes:
and the recording unit is used for recording the member port to be deleted in the link aggregation group and the state of the member port.
And the deleting unit is used for deleting the member port from the link aggregation group and keeping the member port in a closed state before the member port successfully starts the ring network protocol based on the recorded state of the member port.
And the starting unit is used for starting a ring network protocol on the member port and executing state recovery on the member port according to the recorded state of the member port.
In this example, the recording unit is further configured to:
And acquiring the member port to be deleted in the link aggregation group and the current state of the member to be deleted.
And generating the corresponding relation between the member port to be deleted and the state of the member port, and recording the corresponding relation into a preset linked list.
in this example, the recording unit is further configured to:
And emptying the preset linked list before recording the corresponding relation between the member ports and the states of the member ports.
In this example, the recording unit is further configured to:
Reading the recorded status of the member port before deleting the member port from the link aggregation group.
And if the state of the member port is the opening state, closing the member port.
The enabling unit is further configured to:
And reading the recorded state of the member port.
And if the state of the member port is the opening state, opening the member port.
In this example, the apparatus comprises:
The ring network protocol comprises a spanning tree protocol STP or a fast ring network recovery protocol FRRP.
the embodiment of the device for preventing the temporary loop can be applied to network equipment. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. The software implementation is taken as an example, and is formed by reading corresponding computer program instructions in the nonvolatile memory into the memory for operation through the processor of the network device where the software implementation is located as a logical means. In terms of hardware, as shown in fig. 4, a hardware structure diagram of a network device where the apparatus for preventing a temporary loop is located according to the present application is shown, except for the processor, the memory, the network interface, and the nonvolatile memory shown in fig. 4, the network device where the apparatus is located in the embodiment may also include other hardware according to an actual function of the apparatus for preventing a temporary loop, which is not described again.
The implementation process of the functions and actions of each unit in the above device is specifically described in the implementation process of the corresponding step in the above method, and is not described herein again.
for the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the application. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (10)
1. a method for preventing temporary loops, applied to a network device, the network device including at least one ring network protocol-enabled link aggregation group, comprising:
Recording the member port to be deleted in the link aggregation group and the state of the member port;
deleting the member port from the link aggregation group, and keeping the member port in a closed state before the member port successfully starts a ring network protocol based on the recorded state of the member port;
And starting a ring network protocol on the member port, and executing state recovery on the member port according to the recorded state of the member port.
2. the method of claim 1, wherein the recording the member port to be deleted in the link aggregation group and the status of the member port comprises:
Acquiring a member port to be deleted in the link aggregation group and the current state of the member to be deleted;
and generating the corresponding relation between the member port to be deleted and the state of the member port, and recording the corresponding relation into a preset linked list.
3. The method according to claim 2, wherein the recording the corresponding relationship into a preset linked list comprises:
And emptying the preset linked list before recording the corresponding relation between the member ports and the states of the member ports.
4. The method of claim 2, wherein maintaining the member port in a closed state based on the recorded state of the member port comprises:
Reading the recorded state of the member port before deleting the member port from the link aggregation group;
if the state of the member port is an open state, closing the member port;
The performing state recovery on the member port according to the recorded state of the member port includes:
Reading the recorded state of the member port;
And if the state of the member port is the opening state, opening the member port.
5. the method of claim 1, comprising:
The ring network protocol comprises a spanning tree protocol STP or a fast ring network recovery protocol FRRP.
6. An apparatus for preventing temporary loop, applied to a network device, the network device including at least one ring network protocol-enabled link aggregation group, comprising:
A recording unit, configured to record a member port to be deleted in the link aggregation group and a state of the member port;
A deleting unit, configured to delete the member port from the link aggregation group, and keep the member port in a closed state before the member port successfully enables a ring network protocol based on the recorded state of the member port;
and the starting unit is used for starting a ring network protocol on the member port and executing state recovery on the member port according to the recorded state of the member port.
7. The apparatus of claim 6, wherein the recording unit is further configured to:
acquiring a member port to be deleted in the link aggregation group and the current state of the member to be deleted;
and generating the corresponding relation between the member port to be deleted and the state of the member port, and recording the corresponding relation into a preset linked list.
8. The apparatus of claim 7, wherein the recording unit is further configured to:
and emptying the preset linked list before recording the corresponding relation between the member ports and the states of the member ports.
9. The apparatus of claim 7, wherein the recording unit is further configured to:
reading the recorded state of the member port before deleting the member port from the link aggregation group;
if the state of the member port is an open state, closing the member port;
the enabling unit is further configured to:
reading the recorded state of the member port;
And if the state of the member port is the opening state, opening the member port.
10. The apparatus of claim 6, comprising:
The ring network protocol comprises a spanning tree protocol STP or a fast ring network recovery protocol FRRP.
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| CN107547412B (en) * | 2017-05-24 | 2020-05-12 | 新华三技术有限公司 | STP calculation method and device |
| CN111555916B (en) * | 2020-04-26 | 2022-12-23 | 杭州迪普科技股份有限公司 | Method, device, storage medium and equipment for deploying looped network |
| CN114826872B (en) * | 2022-04-02 | 2023-05-26 | 烽火通信科技股份有限公司 | Node protection alarm linkage optimization method and device |
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| US8750122B1 (en) * | 2012-03-22 | 2014-06-10 | Avaya, Inc. | Method and apparatus for layer 2 loop prevention in a multi-node switch cluster |
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| CN101483570B (en) * | 2009-02-17 | 2012-07-11 | 杭州华三通信技术有限公司 | Method, system and device for preventing looped network temporary loop circuit of relaying link |
| CN101557313B (en) * | 2009-04-21 | 2012-09-26 | 烽火通信科技股份有限公司 | Method for protecting uplink plate card of carrier-grade broadband access equipment |
| CN102291261B (en) * | 2011-08-16 | 2013-08-21 | 神州数码网络(北京)有限公司 | Method for accelerating convergence speed of two-layer ring network protocol when high-capacity MAC (Media Access Control) address exists |
| CN103905326B (en) * | 2012-12-28 | 2017-11-24 | 迈普通信技术股份有限公司 | The message transmission control method and the network equipment of Ethernet link clustering |
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| US8213296B2 (en) * | 2009-05-14 | 2012-07-03 | Verizon Patent And Licensing Inc. | Link aggregation protection |
| US8750122B1 (en) * | 2012-03-22 | 2014-06-10 | Avaya, Inc. | Method and apparatus for layer 2 loop prevention in a multi-node switch cluster |
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