CN108173691B

CN108173691B - Cross-device aggregation method and device

Info

Publication number: CN108173691B
Application number: CN201711450359.9A
Authority: CN
Inventors: 张啸宇
Original assignee: Hangzhou DPTech Technologies Co Ltd
Current assignee: Hangzhou DPTech Technologies Co Ltd
Priority date: 2017-12-27
Filing date: 2017-12-27
Publication date: 2021-05-28
Anticipated expiration: 2037-12-27
Also published as: CN108173691A

Abstract

The application provides a method and a device for cross-device aggregation. A method for cross-device aggregation, the method being applied to any member device in a network group comprising a plurality of same network devices, the method comprising: establishing virtual stacking with other member equipment in the network based on a cascade interface configured by a user; adding the ports belonging to the aggregation port into the same aggregation group according to the aggregation port information configured by the user; synchronizing the learned forwarding table items to the other member devices; and searching the port of the equipment from the aggregation port, and modifying the local forwarding table entry according to the searched state of the port. According to the method and the device, the chips can not support stacked devices to realize cross-device aggregation, so that the reliability of the network can be improved.

Description

Cross-device aggregation method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for cross-device aggregation.

Background

With the continuous expansion of network scale, in order to meet the requirements of high reliability and increased link bandwidth of the network, a link aggregation method may be adopted to aggregate a plurality of ports of one device into one logical port for use.

Because the conventional aggregation technology can only realize the backup of the link failure, and has no backup mechanism for the single-point failure of the device, in practical application, a cross-device aggregation technology is mostly adopted, that is, a plurality of ports of different devices are aggregated into one logical port, so that after a certain device fails, the flow can be forwarded across the devices, and the high reliability of the network is ensured.

Since the cross-device aggregation technique generally relies on stacking of devices, devices are required to have stacking capability. For devices where the chip supports stacking, stacking typically requires proprietary protocols that rely on the chip vendor to implement; for devices whose chips do not support stacking, it is more difficult to implement link aggregation across devices.

Disclosure of Invention

In view of this, the present application provides a method and an apparatus for cross-device aggregation, so that a device whose chip does not support stacking can implement cross-device aggregation, thereby increasing the reliability of a network.

Specifically, the method is realized through the following technical scheme:

a method of cross device aggregation, the method comprising:

establishing virtual stacking with other member equipment in the network based on a cascade interface configured by a user;

adding the ports belonging to the aggregation port into the same aggregation group according to the aggregation port information configured by the user;

synchronizing the learned forwarding table items to the other member devices;

and searching the port of the equipment from the aggregation port, and modifying the forwarding table entry according to the searched state of the port.

An apparatus for cross-device aggregation, the apparatus comprising:

the stacking module is used for establishing virtual stacking with other member equipment in the networking based on the cascade interface configured by the user;

the aggregation module is used for adding the ports belonging to the aggregation port into the same aggregation group according to the aggregation port information configured by the user;

a synchronization module, configured to synchronize the learned forwarding entry to the other member devices;

and the first modification module is used for searching the port of the equipment from the aggregation port and modifying the forwarding table entry according to the searched state of the port.

In the method, a virtual stacking relation is established between a cascade port configured by a user and other member devices in a network, ports of the devices establishing the stacking are respectively added into the same aggregation group through aggregation port information configured by the user, and then learned forwarding entries can be synchronized to the other member devices, so that each member device can acquire the forwarding entries of all the member devices in the whole network to simulate cross-device aggregation. In addition, the local forwarding table entry can be further modified through the state of the aggregation port, so that the subsequent message can be normally forwarded after being matched with the forwarding table entry. Compared with the prior art, the method can enable the chips not to support the stacked devices to realize cross-device aggregation, thereby increasing the reliability of the network.

Drawings

FIG. 1 is a flow chart of a method for cross device aggregation as shown in an exemplary embodiment of the present application;

FIG. 2 is a diagram illustrating a virtual stack networking according to an exemplary embodiment of the present application;

FIG. 3 is a diagram illustrating a hardware configuration of a network device in accordance with an exemplary embodiment of the present application;

fig. 4 is a schematic structural diagram of an apparatus for cross-device aggregation according to an exemplary embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

Therefore, in order to solve the above problems, the present application provides a method for cross-device aggregation, which establishes a virtual stacking relationship with other member devices in a network through a cascade port configured by a user, and adds ports of the stacked devices to the same aggregation group through aggregation port information configured by the user, and then synchronizes learned forwarding entries to the other member devices, so that each member device obtains forwarding entries of all member devices in the entire network to simulate cross-device aggregation. In addition, the local forwarding table entry can be modified according to the port state, so that subsequent messages can be normally forwarded after being matched with the forwarding table entry. Compared with the prior art, the method can ensure that the chips do not support the stacked equipment to realize cross-equipment aggregation, thereby ensuring the reliability of the network.

The following describes an implementation process of the present application with reference to specific embodiments.

Referring to fig. 1, fig. 1 is a flowchart illustrating a method for cross-device aggregation according to an embodiment of the present application, where the method is applied to any member device in a network including multiple identical network devices, where the network devices may be switches or the like. Wherein the method may comprise the steps of:

s101, establishing virtual stacking with other member devices in the networking based on the cascade interface configured by the user.

In this embodiment of the present application, a user needs to configure a device to be configured with a virtual stack, and assuming that two devices shown in fig. 2 are configured with a stack, the user needs to configure cascade ports on the two devices respectively, and usually a Fast Ethernet port or a Giga Ethernet port on the device can be configured as the cascade port. In addition, the devices may also be configured with stack IDs and the like, such as configuring the stack IDs of the two devices as 0 and 1, respectively.

It can be assumed that there are four ports 1-4 on device 0, four ports 7-10 on device 1, and port 4 on device 0 and port 7 on device 1 are configured as cascaded ports.

After the configuration is completed, the cascade ports 4 and 7 of the device 0 and the device 1 may be connected through a network cable or a cable, and then the device 0 and the device 1 may send a negotiation message, such as a topology collection message, an election message, and the like, to each other through the cascade ports, so that the device 0 and the device 1 establish a virtual stacking relationship.

And S102, adding the ports belonging to the aggregation port into the same aggregation group according to the aggregation port information configured by the user.

In this embodiment of the present application, after the device 0 and the device 1 establish stacking, a user may further configure aggregation port information, respectively aggregate ports on the device 0 and the device 1, and configure the aggregated ports as the same aggregation port. For example, port 1 and port 2 on device 0 may be aggregated, and the aggregated port is a, while port 8 and port 9 on device 1 may be aggregated, and the aggregated port is also a.

After the aggregation of the ports of each device is completed, the information of the port 1 and the port 2 belonging to the aggregation port may also be issued to the chip of the device 0, and similarly, the information of the port 8 and the port 9 belonging to the aggregation port may be issued to the chip of the device 1, that is, the device may only know which ports in the device belong to the aggregation port a.

S103, synchronizing the learned forwarding table items to the other member devices.

In this embodiment of the present application, after completing cross-device aggregation, device 0 may synchronize the MAC address table entry learned by it to device 1, and similarly, device 1 may synchronize the MAC address table entry learned by it to device 0, so as to complete establishment of MAC address table entries of device 0 and device 1.

For example, when the aggregation port a of the device 0 receives a message sent by a lower device, a mapping relationship between an MAC address and the aggregation port a may be established through learning of a source MAC address of the message and a port receiving the message, and the mapping relationship may be stored in an MAC address table.

Device 0 may also send the mapping relationship between the MAC address and aggregation port a learned to device 1, and device 1 stores the mapping relationship in the local MAC address table. The source MAC addresses of other ports on the device learn the same, and are not described herein again. It can be assumed that after device 0 and device 1 perform source MAC address learning, the MAC address table entries established are as shown in table 1.

MAC address	Port(s)
		Address 1	Aggregation port A
Address 2	Aggregation port A
		Address 3	Port 3
Address 4	Port 10

TABLE 1

It should be noted that, when the device 0 and the device 1 perform MAC address learning, the cascade ports 4 and 7 need to be closed to the MAC address learning.

In this embodiment, in addition to synchronizing the MAC address tables, the device may synchronize the local ARP tables to other member devices.

In addition, after synchronously forwarding the table entry, the device may further query whether the port of each table entry in table 1 is a remote port, that is, a port that does not belong to the device. For device 0, the port corresponding to address 4 in table 1 belongs to the remote port; for device 1, port 3 corresponding to address 3 in table 1 is the remote port.

Taking device 0 as an example for explanation, it can be known from table 1 that the port corresponding to address 4 in table 1 is port 10, and does not belong to the port of device 0, at this time, device 0 may modify the port in the entry into cascade port 4, and may record the real port of the entry before modification, that is, port 10, and the modified entry may be as shown in table 2.

MAC address	Port(s)
		Address 1	Aggregation port A
Address 2	Aggregation port A
		Address 3	Port 3
Address 4	Cascade port 4

TABLE 2

S104, searching the port of the device from the aggregation port, and modifying the local forwarding table entry according to the searched state of the port.

In this embodiment of the present application, after the forwarding table entry is established, the device may further modify the locally established forwarding table entry according to the state of the aggregation port, so that the subsequent message may match the forwarding table entry, and the message may be forwarded normally.

Still taking device 0 as an example, assume that device 0 has currently established a MAC address table as shown in table 2 above. If the device 0 detects the port 1 and the port 2Down at this time, which indicates that the port 1 and the port 2 cannot normally forward the packet, therefore, the device 0 needs to query whether an entry whose port is an aggregation port a exists in the table 2, and the lookup table 2 knows that the port corresponding to the address 1 and the address 2 is the aggregation port a, and at this time, the aggregation port a may be modified to be the cascade port 4, as shown in table 3, so that the packet whose subsequent destination MAC matches the address 1 or the address 2 can be forwarded to the device 1 through the cascade port 4, and after the device 1 matches the local forwarding entry shown in the table 1, the packet can be forwarded normally through the member port 8 or 9 of the aggregation port a.

MAC address	Port(s)
		Address 1	Cascade port 4
Address 2	Cascade port 4
		Address 3	Port 3
Address 4	Cascade port 4

TABLE 3

In addition, after modifying the aggregation port in the entry into the cascade port, the device 0 needs to record the real port before modifying the entry, that is, the aggregation port a. When the subsequent device 0 detects that the port 1 and/or the port 2UP is/are detected, the table entry of which the port is the cascade port in the table 3 may be searched, and according to the recorded real port of the table entry, it may be determined whether the real port of the table entry is the aggregation port a, and if so, the port in the corresponding table entry in the table 3 may be modified from the cascade port 4 to the aggregation port a. Here, the port corresponding to address 1 and address 2 in table 3 can be modified from the tandem port 4 to the aggregation port a.

In the method, a plurality of devices are virtually stacked through a cascade interface configured by a user, ports of the stacked devices are respectively aggregated through aggregation port information configured by the user, and then learned MAC address table entries and ARP table entries can be synchronized to other member devices, so that each member device can obtain forwarding table entries of all member devices in the whole networking. In addition, the local MAC address table entry and ARP table entry can be further modified through the state of the aggregation port, so that the normal forwarding of subsequent messages can be ensured. Compared with the prior art, the technical scheme of the application can realize cross-device aggregation by using the devices which do not support stacking, so that the reliability of the network can be improved.

Corresponding to the foregoing embodiment of a method for cross-device aggregation, the present application further provides an embodiment of an apparatus for cross-device aggregation.

The embodiment of the cross-device aggregation device can be applied to network devices. 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. From a hardware aspect, as shown in fig. 3, the present application is a hardware structure diagram of a network device in which a cross-device aggregation apparatus is located, where except for the processor, the memory, the network output interface, and the nonvolatile memory shown in fig. 3, the network device in which the apparatus is located in the embodiment may also include other hardware according to an actual function of the network device, and details of this are not described again.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an apparatus for cross-device aggregation according to an embodiment of the present application, where the apparatus includes: a stacking module 410, an aggregation module 420, a synchronization module 430, and a modification module 440.

The stacking module 410 is configured to establish a virtual stack with other member devices in the network based on a cascade interface configured by a user;

the aggregation module 420 is configured to add ports belonging to an aggregation port to the same aggregation group according to aggregation port information configured by a user;

a synchronization module 430, configured to synchronize the local forwarding entry to the other member devices;

a first modifying module 440, configured to search a port of the device from the aggregation port, and modify the local forwarding entry according to the searched port state.

In this embodiment of the application, the first modification module 440 is further configured to:

judging the state of the searched port;

when the state of the port is DOWN disconnection, traversing the local forwarding table entry, and determining whether an exit interface is a table entry of the aggregation port;

if yes, modifying the output interface in the table entry into the cascade interface, and recording the output interface in the table entry before modification.

In this embodiment of the present application, the first modifying module 440 is further configured to:

when the state of the port is connection UP, traversing the local forwarding table entry, determining whether an exit interface is the table entry of the cascade port, and recording that the exit interface in the table entry is the aggregation port before modification;

and if the aggregation port exists, modifying the output interface in the table entry into the aggregation port.

In the embodiment of the present application, the apparatus further includes a second modification module 450, configured to:

and when the output interface in the table entry is the port of the other member equipment, modifying the output interface of the table entry into the cascade interface, and recording the output interface in the table entry before modification.

In this embodiment of the present application, the forwarding table entry includes a MAC address table entry and an ARP table entry.

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

1. A method for cross-device aggregation, wherein the method is applied to any member device in a network including a plurality of same network devices, and the method comprises:

synchronizing the learned forwarding table items to the other member devices, wherein the synchronized forwarding table items comprise the mapping relation between the ports of the device and the MAC addresses and the mapping relation between the ports of the other member devices and the MAC addresses, and the ports comprise aggregation ports and non-aggregation ports;

searching a port of the equipment from the aggregation port, and modifying the forwarding table item according to the searched state of the port;

after synchronizing the local forwarding table entry to the other member devices, the method further comprises:

and when the output interface in the table entry is the non-aggregation port of the other member equipment, modifying the output interface of the table entry into the cascade interface, and recording the output interface in the table entry before modification.

2. The method according to claim 1, wherein the modifying the forwarding entry according to the found port status comprises:

judging the state of the searched port;

3. The method of claim 2, further comprising:

when the state of the port is connection UP, traversing the local forwarding table entry, determining whether an exit interface is the table entry of the cascade interface or not, and recording that the exit interface before the table entry is modified is the aggregation port;

4. The method of claim 1, wherein the forwarding entry comprises a MAC address entry and an ARP entry.

5. An apparatus for cross-device aggregation, wherein the apparatus is applied to any member device in a network including a plurality of same network devices, and the apparatus comprises:

a synchronization module, configured to synchronize the learned forwarding table to the other member devices, where the synchronized forwarding table includes a mapping relationship between a port of the device and an MAC address and a mapping relationship between ports of the other member devices and MAC addresses, and the ports include an aggregation port and a non-aggregation port;

a first modification module, configured to search a port of the device from the aggregation port, and modify the forwarding table entry according to the searched port state;

the apparatus further comprises a second modification module to:

6. The apparatus of claim 5, wherein the first modification module is further configured to:

judging the state of the searched port;

7. The apparatus of claim 5, wherein the first modification module is further configured to:

8. The apparatus of claim 5, wherein the forwarding entry comprises a MAC address entry and an ARP entry.