CN103731311A - Annular stacked link failure processing method and device - Google Patents
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Abstract
The invention provides an annular stacked link failure processing method and device. The method comprises the following steps: when a situation that a stacked link connected with a stacking port of a member device has a failure or the stacking port receives a stacked link failure notification message is detected, clearing away a local layer-2 forwarding table and a multicast-source filtering table and forbidding MAC address learning, and sending the stacked link failure notification message from another stacking port. According to the invention, the forwarding interruption time caused by an annular stacked link failure can be shortened.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for handling a failure of a ring stack link.
Background
The ethernet switch Stacking technology may interconnect a plurality of switching devices together to form a distributed switching architecture, and operate as a logical switching entity, which is called a Stacking (Stacking). Each device in the stack is called a member device, the stack member devices are interconnected through the stack port, and the interconnection link is called a stack link.
According to the physical connection relationship among the stacked member devices, the stacking can be divided into chain type stacking, ring type stacking, star type stacking, and the like. As shown in fig. 1, 6 switching devices: the Slot1, the Slot2, the Solt3, the Slot4, the Slot5 and the Slot6 are sequentially connected through a stacking opening, and are connected end to end through the stacking opening to form a ring-shaped stack.
Forwarding messages along the shortest path between member devices in the stack, for example, in fig. 1, the shortest forwarding path of the messages from Slot1 to Slot3 is: the shortest forwarding path of the messages from the Slot1- > Slot2- > Slot3 from the Slot1 to the Slot5 is as follows: slot1- > Slot6- > Slot 5. And each member device in the stack generates a unicast forwarding table and a multicast source filtering table for forwarding the message along the shortest path according to the stack topology.
When a single point of failure occurs in the stacking link, the stacking member device needs to perform topology collection again, and after the topology collection is completed, the unicast forwarding table and the multicast source filtering table are regenerated according to the collected stacking topology. In a time period from when a failure of a stacking link occurs to when a unicast forwarding table and a multicast source filtering table are regenerated, a packet cannot pass through the failed stacking link, which may cause a large amount of packet loss, and the following description is given by taking fig. 1 as an example and combining fig. 2:
assuming that the shortest forwarding path from Slot6 to Slot3 in fig. 1 is Slot6- > Slot5- > Slot4- > Slot3, the shortest forwarding path from Slot3 to Slot5 is: slot3- > Slot4- > Slot 5. When the stacking link between the Slot4 and the Slot5 fails, the messages from the Slot6 to the Slot3 and the messages from the Slot3 to the Slot5 are all discarded in the forwarding process.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for handling a ring stack link failure, which can shorten a forwarding interruption time caused by a ring stack link failure.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a ring stack link failure processing method is applied to any member device in a ring stack, and comprises the following steps:
when detecting a stack link failure Down connected to a stack port of the member device, or when receiving a stack link failure notification message at the stack port, clearing the local two-layer forwarding table and the multicast source filtering table, prohibiting Media Access Control (MAC) address learning, and sending the stack link failure notification message from another stack port.
A ring stack link failure processing device applied to any member device in a ring stack comprises: the device comprises a detection unit, a receiving unit, a processing unit and a sending unit;
the detection unit is used for detecting whether a stacking link connected with a stacking port of the member device fails Down;
the receiving unit is used for receiving a stacking link fault notification message at any stacking port of the member device;
the processing unit is configured to clear the local two-layer forwarding table and the multicast source filtering table and prohibit MAC address learning when the detection unit detects a stacking link Down connected to a stacking port of the member device, or the receiving unit receives a failure notification packet of the stacking link at the stacking port;
the sending unit is configured to detect a stacking link Down connected to a stacking port of the member device, or send a stacking link failure notification message from another stacking port when the receiving unit receives the stacking link failure notification message at the stacking port.
In summary, in the present invention, the member device directly connected to the failed stacking link senses the failure at the corresponding stacking port, clears the local two-layer forwarding table and multicast source filtering table, prohibits MAC address learning, and simultaneously sends a stacking link failure notification message from another stacking port; the member device receiving the stack link failure notification message clears the local two-layer forwarding table and the multicast source filtering table, prohibits the MAC address learning, and continues to forward the stack link failure notification message. Finally, all the stacking member devices broadcast and send the incoming messages, so that message forwarding can be realized without depending on the discovery of the stacking topology before the stacking topology is converged, and the message forwarding interruption time caused by the failure of the stacking link is greatly shortened.
Drawings
FIG. 1 is a schematic view of a prior art annular stack;
FIG. 2 is a schematic diagram of a packet forwarding interruption caused by a failure of a stacking link in a prior art ring stack;
FIG. 3 is a diagram illustrating a method for handling a failure of a ring stack link according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a ring stack link failure processing apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware architecture of a ring stack link failure processing apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the embodiment of the invention, when a stacking link failure (Down) occurs in the ring stack, all stacking member devices execute the clearing operation of the local two-layer forwarding table and the multicast source filtering table, and simultaneously forbid MAC address learning, so that the stacking member devices broadcast and send the incoming messages. After all the stacking member devices sense the stacking link failure and before the stacking topology is converged, each stacking member device sends a message through broadcasting, so that the message packet loss can be avoided, and the forwarding interruption time caused by the annular stacking link failure can be shortened.
Referring to fig. 3, fig. 3 is a flowchart of a ring stack link failure processing method according to an embodiment of the present invention, where the method is applied to any member device in a ring stack, and mainly includes the following steps:
There are various methods for detecting the failure of the stacking link, and it can be determined whether the stacking link connected to the stacking port fails by detecting whether the stacking port fails. As a direct connection member device of a failed stacking link, the member device may detect a stacking port failure (Down) at a corresponding stacking port in at least two ways: sensing the stacking port Down through the interruption of the stacking port Up/Down; the stack port Down is detected by stack port status polling. The existing link failure detection method can also be used for determining whether the stacking link connected with the stacking port fails, such as BFD detection.
After detecting the failure of a stacking link connected with a stacking port, the member device clears the local two-layer forwarding table and the multicast source filtering table and forbids MAC address learning, so that the message entering the member device can be broadcast and sent. Meanwhile, the member device also sends a stacking link failure notification message from another stacking port to notify other member devices of the occurrence of stacking link failure in the annular stack. The stack link failure notification message sent by the member device from another stack port includes information such as a source ID, a stack link failure notification identifier, an ID of the member device, and/or an MAC of the member device. The source ID is used for filtering a multicast source in the process of forwarding the message in the annular stack, and in the embodiment of the invention, the source ID is a special ID which ensures that all members can be reached when the message is sent in a stack port broadcasting mode; a stacking link failure notification identifier for notifying a message receiver that a stacking link failure occurs in the ring stack; the member device identification ID and/or the member device MAC are used for identifying the position of the failure of the stacking link.
In practical application, the stacking member device receives the multicast message at its stacking port, and filters the multicast message by using the multicast source filtering table corresponding to the stacking port according to the source ID of the multicast message, so as to determine which interfaces the multicast message can be sent from and which interfaces the multicast message is prohibited from being sent from.
In the embodiment of the present invention, in order to make the notification message of the failure of the stacking link reach each member device in the ring stack, the member device that detects the failure of the stacking link connected to its own stacking port needs to allocate a special ID that cannot be filtered by the multicast source filter table corresponding to any stacking port in the ring stack before sending the notification message of the failure of the stacking link, and the special ID is used as the source ID of the notification message of the failure of the stacking link that is sent. Therefore, when other member devices in the ring stack receive the stack link failure notification message, the stack link failure notification message is sent from another stack port except the receiving stack port, and the multicast source filter table corresponding to the receiving stack port cannot be filtered.
After detecting the stack link Down connected to a stack port of the member device, before sending a stack link failure notification message from the stack port on the other side, the method further includes: and allocating a special ID, and using the special ID as a source ID of the sent stacking link failure notification message.
In this step, as the non-direct connection member device of the failed stacking link, after receiving the stacking link failure notification message at a stacking port of the member device, the member device determines that the stacking link failure occurs in the annular stacking, and therefore, the operation of clearing the local two-layer forwarding table and the multicast source filter table and prohibiting MAC address learning is also performed, so that the message entering the member device is broadcast and sent afterwards. Meanwhile, the member device continues to forward the stack link failure notification message from another stack port, so that the stack link failure notification message is finally transmitted to all member devices in the ring stack.
It can be seen from the above steps that, in the ring stack, no matter the member device directly senses the failure of the stacking link, or the member device senses the failure of the stacking link after receiving the notification message of the failure of the stacking link, the operations of clearing the local two-layer forwarding table and the multicast source filtering table and prohibiting the learning of the MAC address are performed, so that the broadcast transmission is performed on the message when the message is subsequently received, and the message is prevented from being discarded.
It should be noted that, the above steps 301 and 302 are not in sequence, and are different processing manners determined by two specific situations, that is, whether the member device and the failed stacking link are directly connected or not directly connected.
In practical applications, after a failure of a stacking link occurs, each member device in a ring stack needs to re-collect a stacking topology, so as to generate a unicast forwarding table (the unicast forwarding table is used for forwarding messages between the stacking member devices) and a multicast source filtering table according to the new stacking topology.
In the embodiment of the present invention shown in fig. 3, a stack link Down connected to a stack port of the member device is detected, or after the stack port receives a stack link failure notification message, a topology of the ring stack is also collected again, after the topology collection is completed, a unicast forwarding table and a multicast source filter table may be regenerated according to the collected complete topology information, because the unicast forwarding table is generated based on a new stack topology, when a packet is forwarded according to the unicast forwarding table, a packet forwarding path does not pass through the failed stack link, so that MAC address learning may be recovered at this time, and then, a broadcast transmission is not performed on a packet having a corresponding two-layer forwarding table entry, but a packet transmission is performed according to the two-layer forwarding table and the unicast forwarding table.
In the embodiment of the present invention shown in fig. 3, after the ring stacking link fails, each member device may set a stacking link failure fast forwarding state flag to indicate that the device enters a stacking link failure fast forwarding state, and broadcast and send an incoming message. After each member device completes topology collection, the set fast forwarding state flag of the stacking link fault can be cleared to indicate topology convergence and each member device starts to forward the incoming message based on the new topology.
Therefore, after detecting a stack link Down connected to a stack port of the member device, or after receiving a stack link failure notification message at the stack port, a stack link failure fast forwarding status flag may be further set. After the topology collection is completed, the unicast forwarding table and the multicast source filtering table are regenerated according to the collected complete topology information, and the MAC address learning is recovered, the member equipment can also clear the fast forwarding state mark of the stacking link fault.
And the member equipment entering the stacking link fault fast forwarding state directly discards the notification message of the stacking link fault if the notification message of the stacking link fault is received, and does not need to be processed again.
Therefore, in step 302, after receiving the notification packet of the stacking link failure at a stacking port of the member device, the member device may determine whether a fast forwarding state flag of the stacking link failure is set in the member device before clearing the local second-layer forwarding table and the multicast source filter table and prohibiting MAC address learning, and if so, determine that the member device is already in the fast forwarding state of the stacking link failure and does not need to process again, so the notification packet of the stacking link failure is discarded, otherwise, determine that the member device is not already in the fast forwarding state of the stacking link failure, so the member device needs to perform an operation of clearing the local second-layer forwarding table and the multicast source filter table and prohibiting MAC address learning, so as to broadcast and send the incoming packet.
The method for handling a stacking link failure according to the embodiment of the present invention shown in fig. 3 is described below by taking fig. 2 as an example.
Stack link failure between the Slot4 and the Slot5, which can be sensed by the Slot4 and the Slot5 and informed by the Slot4, and the principle is the same, and the description is only given by taking the Slot4 as an example;
the Slot4 detects a stacking link Down between the Slot5, so that a local two-layer forwarding table and a multicast source filtering table are cleared, MAC address learning is forbidden, and a stacking link fault notification message is sent from a stacking port connected with the Slot 3;
the stack link failure notification message sequentially passes through the Slot3, the Slot2, the Slot1 and the Slot6, and finally reaches the Slot5 (here, the situation that the stack link failure notification message is discarded due to the fact that the stack link failure fast forwarding state is already achieved is ignored), and each member device through which the stack link failure notification message passes clears the local two-layer forwarding table and the multicast source filtering table and prohibits MAC address learning.
And at this moment, all member devices in the annular stack sense the failure of the stacking link, enter a rapid forwarding state of the failure of the stacking link and broadcast and forward the entered message.
And then, the Solt1-Slot6 starts topology collection, when topology information of all member devices is collected, the topology collection can be determined to be completed, at the moment, the unicast forwarding table and the multicast source filtering table can be recalculated, MAC address learning is recovered, the rapid forwarding state of the fault of the stacking link is relieved, and the message is forwarded according to the two-layer forwarding table and the unicast forwarding table.
The above describes in detail the method for processing a failure of a ring stack link according to an embodiment of the present invention, and the present invention further provides a device for processing a failure of a ring stack link, which is described below with reference to fig. 4.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a ring stack link failure processing apparatus according to an embodiment of the present invention, which is applied to any member device in a ring stack, and as shown in fig. 4, the apparatus includes: detection section 401, reception section 402, processing section 403, and transmission section 404; wherein,
a detecting unit 401, configured to detect whether a stacking link connected to a stacking port of the member device is Down;
a receiving unit 402, configured to receive a notification message of a failure of a stacking link at any stacking port of the member device;
a processing unit 403, configured to, when the detecting unit 401 detects a stack link Down connected to a stack port of the member device, or the receiving unit 402 receives a stack link failure notification message at the stack port, clear the local two-layer forwarding table and multicast source filtering table, and prohibit MAC address learning;
a sending unit 404, configured to detect a stack link Down connected to a stack port of the member device by the detection unit 401, or send a stack link failure notification message from another stack port when the receiving unit 402 receives the stack link failure notification message at the stack port.
In the device as described in figure 4,
the processing unit 403, after the detecting unit 401 detects a stack link Down connected to a stack port of the member device, or the receiving unit 402 receives a stack link failure notification message at the stack port, is further configured to: and re-collecting the ring stack topology, after the topology collection is completed, re-generating a unicast forwarding table and a multicast source filtering table according to the collected complete topology information, and recovering MAC address learning.
In the device as described in figure 4,
the processing unit 403, after the detecting unit 401 detects a stack link Down connected to a stack port of the member device, or the receiving unit 402 receives a stack link failure notification message at the stack port, is further configured to: setting a rapid forwarding state flag of a stacking link fault;
the processing unit 403, after the topology collection is completed, is further configured to: clearing the stack link failure fast forwarding state flag.
In the device as described in figure 4,
the processing unit 403, after the receiving unit 402 receives the stack link failure notification packet at the stack port, before clearing the local two-layer forwarding table and the multicast source filtering table and prohibiting MAC address learning, is further configured to: if the fast forwarding state flag of the stacking link fault is set in the member device, the notification message of the stacking link fault is discarded, and if the notification message of the stacking link fault is not set, the local two-layer forwarding table and the multicast source filtering table are cleared, and MAC address learning is forbidden.
In the device as described in figure 4,
the processing unit 403, after the detecting unit 401 detects a stack link Down connected to a stack port of the member device, is further configured to: assigning a unique identification ID that cannot be filtered by any of the stack ports in the ring stack;
the sending unit 404 is configured to use the dedicated ID assigned by the processing unit 403 as a source ID of the sent stack link failure notification packet.
The above description is made on the ring-shaped stacked link failure processing apparatus according to the embodiment of the present invention, which is a programmable device capable of combining software and hardware, and the hardware architecture composition of the ring-shaped stacked link failure processing apparatus according to the embodiment of the present invention is given below, specifically referring to fig. 5, where fig. 5 is a schematic diagram of the hardware architecture composition of the ring-shaped stacked link failure processing apparatus according to the embodiment of the present invention, and includes hardware such as a forwarding chip, a CPU (central processing unit), a memory, and a storage medium; the CPU reads a computer program for realizing the method from a storage medium such as a disk and the like into the memory, functional modules for completing the method are formed in the memory, and the CPU runs machine readable instructions in the memory to complete the program steps corresponding to the divided functional modules in the method, so that the functions completed by the method are realized.
It should be noted that the apparatus shown in fig. 5 is only a specific example, and may be implemented by other structures different from those described in the present embodiment, for example, operations performed when the above instruction codes are executed may also be implemented by an Application Specific Integrated Circuit (ASIC). In addition, the above-mentioned CPU may be one or more, and if there are a plurality of CPUs, the plurality of CPUs are responsible for reading and executing the instruction codes from a storage medium such as a magnetic disk. Therefore, the present application does not specifically limit the specific structure of the device.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A ring stack link failure processing method is applied to any member device in a ring stack, and is characterized by comprising the following steps:
when detecting a stack link failure Down connected to a stack port of the member device, or when receiving a stack link failure notification message at the stack port, clearing the local two-layer forwarding table and the multicast source filtering table, prohibiting Media Access Control (MAC) address learning, and sending the stack link failure notification message from another stack port.
2. The method of claim 1,
detecting a stacking link Down connected to a stacking port of the member device, or after receiving a stacking link failure notification message at the stacking port, further comprising: and re-collecting the ring stack topology, and after the topology collection is finished, re-generating a unicast forwarding table and a multicast source filtering table according to the collected complete topology information and recovering MAC address learning.
3. The method of claim 2,
detecting a stacking link Down connected to a stacking port of the member device, or after receiving a stacking link failure notification message at the stacking port, further comprising: setting a rapid forwarding state flag of a stacking link fault;
after regenerating the unicast forwarding table and the multicast source filtering table according to the collected complete topology information and recovering the MAC address learning, the method further comprises the following steps: clearing the stack link failure fast forwarding state flag.
4. The method of claim 3,
after the stack port receives the stack link failure notification message, before clearing the local two-layer forwarding table and the multicast source filtering table and prohibiting MAC address learning, the method further includes: if the fast forwarding state flag of the stacking link fault is set in the member device, discarding the notification message of the stacking link fault, and if the notification message of the stacking link fault is not set, executing the steps of clearing the local two-layer forwarding table and the multicast source filtering table and forbidding the MAC address learning.
5. The method according to any one of claims 1 to 4,
after detecting the stack link Down connected to a stack port of the member device, before sending a stack link failure notification message from the stack port on the other side, the method further includes: a special ID which cannot be filtered by any stack port in the ring stack is allocated and used as a source ID of a transmitted stack link failure notification message.
6. A ring stack link failure handling apparatus applied to any member device in a ring stack, the apparatus comprising: the device comprises a detection unit, a receiving unit, a processing unit and a sending unit;
the detection unit is used for detecting whether a stacking link connected with a stacking port of the member device fails Down;
the receiving unit is used for receiving a stacking link fault notification message at any stacking port of the member device;
the processing unit is configured to clear the local two-layer forwarding table and the multicast source filtering table and prohibit MAC address learning when the detection unit detects a stacking link Down connected to a stacking port of the member device, or the receiving unit receives a failure notification packet of the stacking link at the stacking port;
the sending unit is configured to detect a stacking link Down connected to a stacking port of the member device, or send a stacking link failure notification message from another stacking port when the receiving unit receives the stacking link failure notification message at the stacking port.
7. The apparatus of claim 6,
the processing unit, after the detecting unit detects a stacking link Down connected to a stacking port of the member device, or the receiving unit receives a failure notification message of the stacking link at the stacking port, is further configured to: and re-collecting the ring stack topology, and after the topology collection is finished, re-generating a unicast forwarding table and a multicast source filtering table according to the collected complete topology information and recovering MAC address learning.
8. The apparatus of claim 7,
the processing unit, after the detecting unit detects a stacking link Down connected to a stacking port of the member device, or the receiving unit receives a failure notification message of the stacking link at the stacking port, is further configured to: setting a rapid forwarding state flag of a stacking link fault;
after the processing unit regenerates the unicast forwarding table and the multicast source filtering table according to the collected complete topology information and recovers the MAC address learning, the processing unit is further configured to: clearing the stack link failure fast forwarding state flag.
9. The apparatus of claim 8,
the processing unit, after the receiving unit receives the stack link failure notification packet at the stack port, is further configured to, before clearing the local two-layer forwarding table and the multicast source filtering table and prohibiting MAC address learning: if the fast forwarding state flag of the stacking link fault is set in the member device, the notification message of the stacking link fault is discarded, and if the notification message of the stacking link fault is not set, the local two-layer forwarding table and the multicast source filtering table are cleared, and MAC address learning is forbidden.
10. The apparatus of any one of claims 6-9,
the processing unit, after the detection unit detects a stacking link Down connected to a stacking port of the member device, is further configured to: allocating a special identification ID which cannot be filtered by a multicast source filtering table corresponding to any stacking port in the annular stack;
and the sending unit is used for taking the special ID allocated by the processing unit as the source ID of the sent stacking link failure notification message.
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| CN108933720B (en) * | 2017-05-25 | 2021-11-02 | 中兴通讯股份有限公司 | Information processing method, device and system for ring system and storage medium |
| CN109639573A (en) * | 2019-01-28 | 2019-04-16 | 新华三技术有限公司 | One provenance filters detection method and device |
| CN113472643A (en) * | 2021-06-15 | 2021-10-01 | 新华三信息安全技术有限公司 | Fault processing method and device |
| CN113472643B (en) * | 2021-06-15 | 2023-08-18 | 新华三信息安全技术有限公司 | Fault processing method and device |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Applicant after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Applicant before: Huasan Communication Technology Co., Ltd. |
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Application publication date: 20140416 |