CN100433693C - Method for dynmaic establishing virtual local network table and Ethernet equipment - Google Patents

Abstract

A method for dynamically setting up table of virtual local area network includes configuring VLAN information being able to be supported by Ethernet device port, setting up relevant VLAN table when VLAN being able to use said port to support message identification is confirmed and relevant VLAN table being not existed is confirmed according to said information after message is received by port.

Description

A method for dynamically creating a virtual local area network table and an Ethernet device

technical field

The invention relates to the technical field of Ethernet, in particular to a method for dynamically creating a virtual local area network table and an Ethernet device.

Background technique

With the promotion of the market, the development of Ethernet is getting faster and faster, and the application is more and more extensive. VLAN (Virtual Local Area Network, virtual local area network), is to logically divide a group of workstations and servers located on the same physical network segment into different logical network segments. ) are basically the same, and can provide interconnection and transmission of terminal systems within a certain range. The emergence of VLAN technology has provided great help in limiting broadcast storms in the network and improving the security of LANs. Therefore, the application of VLAN technology in Ethernet is becoming more and more common.

As stipulated in the 802.1Q protocol, the maximum value of VLAN ID (identification) is 4095. When more and more switches are cascaded in the network, the VLAN ID resources in the network become extremely scarce. The emergence of QinQ (802.1Qin 802.1Q (stacked VLANs), double-layer VLAN) technology effectively solves the problem of shortage of VLAN ID resources in the network, and provides a relatively simple two-layer VPN (Virtual Private Network, virtual private network) )plan. QinQ is a visual name for the tunneling protocol based on 802.1Q encapsulation. Its core idea is to encapsulate the VLAN of the user's private network into the VLAN of the public network. The user provides a relatively simple Layer 2 VPN tunnel.

Since an Ethernet device needs to support a corresponding VLAN if it wants to process packets, at present, if an Ethernet device needs to support a certain VLAN, it needs to create a corresponding VLAN table locally and add the VLAN The table is bound to the corresponding port, and the attribute information of the VLAN is saved in the VLAN table. When the port has a message to be processed, the Ethernet device obtains the corresponding VLAN ID from the message, searches the locally saved VLAN table of the port according to the VLAN ID, and after finding the VLAN table corresponding to the VLAN ID, according to The attribute information of the VLAN stored therein is processed accordingly.

It can be seen that the current Ethernet equipment must first create a VLAN table of a certain VLAN and bind the VLAN table to a certain port before the port can support the VLAN. Since the VLAN division of the lower network of the Ethernet device as a network node may change, for the sake of convenience, the network administrator hopes that the Ethernet device can support a large number of VLANs, so that the network administrator can configure the VLANs that need to be supported at one time. All VLANs are configured well, so even if the VLAN of the lower layer network changes, there is no need to modify the configuration of the network node. However, when an Ethernet device needs to support a large number of VLANs, a large number of VLAN tables need to be created. After an Ethernet device supports QinQ technology, a maximum of 4096×4096 VLAN tables need to be created on a port. If a device has 32 ports, then in extreme cases, 4096×4096×32 VLAN tables need to be created. Based on the fact that each VLAN table occupies 2 bytes, these VLAN tables take up 1G of memory, which is unbearable for Ethernet devices. Therefore, many current Ethernet devices limit the number of VLANs they can support, and the number of VLANs that an Ethernet device can support has also become an important indicator for measuring the performance of Ethernet devices. Especially for BRAS (Broadband Remote Access Server, Broadband Access Server), Layer 3 Switch (Layer3Switch) and other devices, since these devices are generally at the aggregation layer of the MAN, the lower-layer network they connect to is generally divided into many VLANs. , which requires them to have strong VLAN support capabilities.

Contents of the invention

Embodiments of the present invention provide a method for dynamically creating a virtual local area network table and an Ethernet device to solve the problem in the prior art that the number of VLANs that the Ethernet device can support is limited.

In order to solve the above technical problems, an embodiment of the present invention provides a method for dynamically creating a virtual local area netlist, comprising the following steps:

Configure the information of the virtual local area network (VLAN) that the Ethernet device port can support; and

After the port receives the message, according to the information, it is determined that the port can support the VLAN identified by the message and when it is determined that there is no corresponding VLAN table, create a corresponding VLAN table for the port;

When the number of concurrently existing VLAN tables of the Ethernet device is greater than a set threshold, aging the currently unused VLAN tables is performed.

The embodiment of the present invention also provides an Ethernet device, including a port for receiving and sending messages and a first storage module for saving a VLAN table, the Ethernet device includes a second storage module, a processing module and an aging module, in:

The second storage module saves the information of the virtual local area network (VLAN) supported by the port of the Ethernet device;

After the port receives the message, the processing module determines according to the information that the port can support the VLAN identified by the message and determines that there is no corresponding VLAN table, creating a corresponding VLAN table for the port;

The aging module ages the currently unused VLAN tables when the number of concurrently existing VLAN tables in the Ethernet device is greater than a set threshold.

In the embodiment of the present invention, configure the information of the VLAN that the Ethernet device port can support; and after the port receives the message, determine that the port can support the VLAN identified by the message and determine that there is no corresponding VLAN according to the information table, create a corresponding VLAN table for the port, and when the number of VLAN tables existing on the Ethernet device at the same time is greater than the set threshold, the currently unused VLAN table will be aged. By adopting the technical scheme of the embodiment of the present invention, it is possible to break through the limitation on the number of VLANs that Ethernet devices can support in the prior art, and only need a small amount of storage space to save the information of the VLANs that it can support, thereby reducing the number of VLANs that Ethernet devices can support. The load to support the VLAN under it protects the resources of the Ethernet device.

Description of drawings

Fig. 1 is the flowchart of dynamically creating VLAN table in the embodiment of the present invention;

Fig. 2 is the flow chart of determining whether to start the aging mechanism of VLAN table in the embodiment of the present invention;

Fig. 3 is the flowchart of method two in the aging mechanism of VLAN table in the embodiment of the present invention;

Fig. 4 is a system block diagram of Ethernet equipment in the embodiment of the present invention;

Fig. 5 is another system block diagram of the Ethernet device in the embodiment of the present invention.

Detailed ways

Because the number of VLANs corresponding to the messages passing through the Ethernet equipment will not be many in a period of time, the number of VLANs that the Ethernet equipment needs to support at the same time will not be many, and the present invention can utilize this feature of the Ethernet equipment to dynamically create VLANs , enabling Ethernet devices to support a large number of VLANs.

In this embodiment, configure the information of the VLAN that the port of the Ethernet device can support; and after the port receives the message, determine that the port can support the VLAN identified by the message and determine that there is no corresponding VLAN table according to the information , create a corresponding VLAN table for the port.

The present embodiment will be further described below in conjunction with the accompanying drawings.

In this embodiment, a VLAN configuration table is added to the Ethernet device to store information about the VLANs that each port of the Ethernet device can support. The VLAN configuration table can be generated when the network administrator configures it for the first time. For example, the network administrator first configures a port of the Ethernet device to support VLANs with VLAN IDs from 1 to 1024. At this time, a VLAN configuration table will be generated on the Ethernet device, and there is only one node in the table. The VLAN information of this configuration is recorded. Since the configuration is a VLAN with continuous VLAN IDs, it is only necessary to record the start VLAN ID '1' and the end VLAN ID '1024' to indicate that VLANs with VLAN IDs from 1 to 1024 can be supported. OK, it takes up very little space. When the network administrator configures the port to support VLANs with VLAN IDs from 2048 to 4094, the Ethernet device will create another node in the configuration table to record the configuration information.

Since the VLAN configuration table is added in the present embodiment to preserve the information of the VLANs that each port of the Ethernet device can support respectively, the process of dynamically creating the VLAN table in the present embodiment is as shown in Figure 1, including the following steps:

When the port receives a message, judge whether the port can support the VLAN identified by the message but does not have a corresponding VLAN table, and when it is determined that it can support the VLAN identified by the message but does not have a corresponding VLAN table, it is The port creates the corresponding VLAN table.

Step S101, the Ethernet device receives a message;

Step S102, query the VLAN table corresponding to the port that receives the message stored locally, if there is a VLAN table corresponding to the VLAN ID carried by the message, then directly end; otherwise, proceed to step S103;

Step S103, inquire the VLAN configuration table of local preservation, judge whether Ethernet device can support the corresponding VLAN of this VLAN ID, if yes, carry out step S104, otherwise end directly;

Step S104, creating the VLAN table for the port.

It can be seen that, adopting the technical solution of this embodiment, in extreme cases, the network administrator can configure all VLANs under a port, such as configuring VLAN 1-4094 QinQ 1-4094, only one node is needed in the VLAN configuration table You can record the configuration. It can be seen that in this case, after the port receives the message, as long as it judges that there is no VLAN table corresponding to the VLAN ID carried by the message, it will create a new VLAN table. If the port is changed, 4094×4094 VLAN tables corresponding to the port may be created in the end. If the N ports of the Ethernet can support all the VLANs under it, the Ethernet device may finally create 4094×4094×N VLAN tables. The system resources occupied by so many VLAN tables are unbearable for Ethernet devices. As mentioned above, the number of VLANs corresponding to the packets passing through the device will not be many in a period of time, that is, in a period of time, some VLAN tables are not in use. In order to reduce the load of the Ethernet device, you can Aging is performed on VLAN tables that are not in use.

In order to age the VLAN table not in use, in this embodiment, after each VLAN table is successfully created, the Ethernet device performs the process shown in Figure 2, including the following steps:

Step S201, adding 1 to the number of currently existing VLAN tables;

The Ethernet device may locally save the number of currently existing VLAN tables.

Step S202, detecting whether the number of VLAN tables existing at the same time is greater than a set threshold, if yes, proceed to step S203, otherwise directly end;

Step S203, start the aging mechanism of the VLAN table.

In specific implementation, the above detection may not be performed after each VLAN table is successfully created, but may periodically detect whether the number of existing VLAN tables is greater than a set threshold, and perform corresponding processing according to the detection result.

In this embodiment, various aging mechanisms of VLAN tables are provided, for example:

method one

When an Ethernet device has an online user in the VLAN under each port, it records the user information of the online user in the corresponding VLAN table, then after the aging mechanism of the VLAN table is started, it queries When it is determined that there is no user information, the corresponding VLAN table is deleted.

Taking the BRAS device as an example, the number of online users it can support is limited, and each user can only belong to one VLAN, that is to say, the number of VLAN tables being used is limited. For example, if a BRAS device can only support 10,000 users, only 10,000 VLAN tables are useful during this period of time, and other useless VLAN tables can be aged out. Therefore, the set threshold of VLAN tables that exist simultaneously on the BRAS device can be 10,000. However, in order to prevent repeated creation and deletion of VLAN tables, it is recommended to restart when the number of VLAN tables created exceeds twice the number of users allowed to access the device. aging mechanism.

In actual implementation, after the aging mechanism of the VLAN table is started, the local VLAN table of the Ethernet device can be traversed, and part of the VLAN table can also be queried according to the settings. For example, only the VLAN table of a certain port of the Ethernet device is queried and the Delete the VLAN table corresponding to the VLAN with no online user on the port. In the specific processing, it is possible to delete only the VLAN table corresponding to the VLAN with no online user on a certain port, so that the number of VLAN tables existing on the Ethernet device at the same time is not greater than the set value. Threshold, in this way, the number of VLAN tables deleted at one time is relatively small, which can avoid repeatedly creating and deleting a large number of VLAN tables.

Method Two

If the Ethernet device receives or sends packets on each port, a mark is made in the corresponding VLAN table to indicate that the VLAN table is in use. After the aging mechanism of the VLAN table is started, the Ethernet device performs the process as shown in Figure 3. process, including the following steps:

Step S301, inquire whether there is a tag in the currently existing VLAN table, if yes, proceed to step S302, otherwise, proceed to step S303;

In this step, the local VLAN table saved by the Ethernet device can be traversed, and part of the VLAN table can also be queried according to the settings.

Step S302, clear the corresponding flag, end;

Step S303, delete the corresponding VLAN table.

Visible, through above-mentioned process, after the mark of a VLAN table is cleared, if still do not have mark when inquiring whether it exists mark next time, promptly corresponding VLAN does not process message during this period, then this VLAN table can be deleted.

In concrete implementation, can not just delete this VLAN table after inquiring in a VLAN table at every turn and do not have this label, but can delete this VLAN table after inquiring into a VLAN table and do not have this label to reach setting number of times .

In addition, different from the above method of marking in the VLAN table, if the Ethernet device receives or sends packets on each port, it can also record a time stamp information in the corresponding VLAN table to mark the time of receiving or sending packets. Time, and after the aging mechanism of the VLAN table starts, the Ethernet device can age the VLAN according to the time stamp information.

It should be noted that the above-mentioned methods corresponding to the embodiments of the present invention may be stored in a computer-readable storage medium.

The Ethernet device in this embodiment, as shown in Figure 4, includes a port 100 and a first storage module 200, in order to realize dynamic creation of a VLAN table, the Ethernet device in this embodiment also includes a second storage module 300 and a processing module 400, of which:

Port 100 receives and sends messages;

The first storage module 200 saves the VLAN table;

The second storage module 300 saves the VLAN information that the Ethernet device port 100 can support;

After the port receives the message, the processing module 400 determines according to the information that the port can support the VLAN identified by the message and determines that there is no corresponding VLAN table, and creates a corresponding VLAN table for the port.

As shown in FIG. 5, the processing module 400 may include a first judging unit 401 and a second judging unit 402, wherein:

When the first judging unit 401 receives a message at the port, it judges whether there is a VLAN table corresponding to the message in the first storage module 200, and notifies the second judging unit 402 when it is determined that it does not exist;

The second judging unit 402 judges whether the port can support the VLAN identified by the message according to the information stored in the second storage module 300 and outputs the judging result.

The Ethernet device in this embodiment may include an aging module 500, wherein:

The aging module 500 ages the currently unused VLAN tables when the number of concurrently existing VLAN tables on the Ethernet device is greater than a set threshold.

Since the aging module 500 can judge after creating the VLAN table each time, the processing module 400 notifies the aging module 500 after creating the VLAN table in the first storage module 200;

The aging module 500 performs processing according to the notification.

For the first method of aging the VLAN table that is not in use, the Ethernet device may include a control module for recording the user information of the online user of the corresponding VLAN in the VLAN table in the first storage module 200;

The aging module 500 queries whether there is user information in the VLAN table in the first storage module 200, and deletes the corresponding VLAN table when it is determined that there is no user information.

For the second method of aging the VLAN table that is not in use, the Ethernet device may include a marking module, which is used to mark the corresponding VLAN table in use in the first storage module 200 when the port receives or sends a message;

The aging module 500 inquires whether there is a tag in the VLAN table in the first storage module 200, and if so, clears the tag; otherwise, deletes the corresponding VLAN table.

Adopting the technical solution of this embodiment, in extreme cases, the network administrator configures the Ethernet device to support all VLANs under it, no matter how the VLAN division of the underlying network changes, manual intervention is no longer required, greatly reducing the network administrator's workload.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1, a kind of method of dynmaic establishing virtual local network table is characterized in that, may further comprise the steps:

The information of the virtual LAN VLAN that the configuration ethernet device port can be supported; And

After described port receives message, when determining that according to described information described port can be supported the VLAN of described message identification and determine not have corresponding vlan table, for described port is created corresponding vlan table;

When the quantity of the simultaneous vlan table of described ethernet device during, the current vlan table that does not have to use is worn out greater than setting threshold.

2, the method for claim 1, it is characterized in that, after described port receives message, judge whether described port exists the vlan table of described message correspondence earlier, when determining not exist, judge again whether described port can support the VLAN of described message identification.

3, the method for claim 1 is characterized in that, when creating vlan table, whether the quantity of judging the simultaneous vlan table of described ethernet device is greater than setting threshold periodically or each.

4, method as claimed in claim 3 is characterized in that, the online user's of record corresponding VLAN user profile in vlan table;

The concrete grammar that the current vlan table that does not have to use is worn out is: whether have user profile in the inquiry vlan table, and delete corresponding vlan table when determining not have user profile.

5, method as claimed in claim 3 is characterized in that, when described port received or send message, the corresponding vlan table of mark used;

The concrete grammar that the current vlan table that does not have to use is worn out is: whether the inquiry vlan table exists mark, if remove described mark; Otherwise, delete corresponding vlan table.

6, a kind of ethernet device comprises being used to receive and send the port of message and first memory module of preserving vlan table, it is characterized in that described ethernet device comprises second memory module, processing module and aging module, wherein:

The information of the virtual LAN VLAN that described second memory module preservation ethernet device port can be supported;

Described processing module is after described port receives message, when determining that according to described information this port can be supported the VLAN of described message identification and determine not have corresponding vlan table, for described port is created corresponding vlan table;

Described aging module wears out to the current vlan table that does not have to use when the quantity of the simultaneous vlan table of described ethernet device during greater than setting threshold.

7, ethernet device as claimed in claim 6 is characterized in that, described processing module comprises first judging unit and second judging unit, wherein:

Described first judging unit is judged the vlan table that whether has described message correspondence in described first memory module when described port receives message, and is determining to notify when not existing described second judging unit;

The information that described second judging unit is preserved according to described second memory module judges whether described port can be supported the VLAN of described message identification and export judged result.

8, ethernet device as claimed in claim 6 is characterized in that, described processing module is notified described aging module create vlan table in described first memory module after;

Described aging module is handled according to described notice.

9, ethernet device as claimed in claim 8 is characterized in that, described ethernet device comprises control module, is used for the user profile of the online user of record corresponding VLAN in the vlan table of described first memory module;

Described aging module inquires about in the vlan table in described first memory module whether have user profile, and deletes corresponding vlan table when determining not have user profile.

10, ethernet device as claimed in claim 8 is characterized in that, described ethernet device comprises mark module, is used for when described port receives or send message, and the corresponding vlan table of mark uses in described first memory module;

Whether the vlan table that described aging module is inquired about in described first memory module exists mark, if remove described mark; Otherwise, delete corresponding vlan table.

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