WO2010012143A1

WO2010012143A1 - Method and system of virtual local area network data forwarding

Info

Publication number: WO2010012143A1
Application number: PCT/CN2008/073621
Authority: WO
Inventors: 俞杰
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-07-26
Filing date: 2008-12-19
Publication date: 2010-02-04
Also published as: CN101325531A; CN101325531B

Abstract

A method and a system of Virtual Local Area Network data forwarding are disclosed. The method includes: layer 2 accessing device constructing the first mapping relation table of the VLAN identifier at the network side and the service information of respective service to the VLAN identifier and the port at the user side; layer 2 accessing device looking up the VLAN identifier and the port at the user side in the first mapping relation table according to the VLAN identifier and service information of the data frame when sending the data frame from the network side to the user side, sending the data frame from the port found at the user side, after replacing the VLAN identifier in the data frame with the VLAN identifier found at the user side.

Description

Virtual local area network data forwarding method and system

Technical field

The present invention relates to the field of Layer 2 Ethernet switching in mobile communication, and in particular, to a method and system for forwarding data in a virtual local area network.

Background technique

With the rapid growth of the access network's demand for service bandwidth and the development of data communication technology and the reduction of cost, data communication includes Asymmetric Digital Subscriber Line (ADSL) / Very High Speed Digital Subscriber Loop ( Very High Bit) Rate Digital Subscriber Line (VDSL), Ethernet Switch, PASSIVE OPTICAL NETWORK BASED ON ETHERNET (EPON) / Gigabit-capable Passive Optical Network (GPON) technology for its business Transparent, long-lived, large bandwidth carrying capacity, able to adapt to the growing bandwidth and new business development needs, and become an important way to build the access layer network.

The following service model exists in the access network service access network: a Layer 2 access device, which can be a Layer 2 Ethernet switch, or an EPON/GPON/DSLAM (Digital Subscriber Line Access Multiplexer) A line access multiplexer is connected to the device, and a virtual local area network (Vlan) on the network side is used to represent the user, and each user has a Vlan; the Vlan on the user side is used to represent a certain service of the user. A user has several businesses.

In the service forwarding process, a multi-to-one conversion of the virtual local area network (Vlan) of the service frame needs to be performed in the uplink and the downlink. The Layer 2 access device has multiple user-side ports. Each user-side port is divided into several virtual local area networks (Vlans). Several user-side ports are divided into one user. Each virtual office i or network identifier under the user (Virtual Local Area Network Identification, Vlan ID) are different, representing different services; each service is configured with a Class of Service (COS) value, and the Quality of Service Level (COS) for each service is not The same is true; however, the VLAN IDs of different users may be the same, and the quality of service levels (COS) of the same type of services of different users may be the same; if the user-side port is divided into several virtual local area networks (Vlans), The Ethernet frame entering the user side port must be with the IEEE802.1Q protocol. Negotiate the tag (tag). The network side port is allowed to be multiple. Take one as an example. Each network side port belongs to several Vlans. Each Vlan represents one user. The Ethernet frame entering the network side port must be labeled with IEEE802.1 Q protocol. The COS value indicates different services.

When the Layer 2 access device converts the received data from the user side to the network side to perform a virtual local area network (Vlan) conversion, the user side respectively represents a virtual local area network (Vlan) of a plurality of different services of a certain user, to the network side. A single virtual local area network (Vlan) representing the service performs a many-to-one virtual local area network (Vlan) conversion, so that in the reverse one-to-many conversion, one virtual local area network (Vlan) cannot be converted into multiple virtual local area networks (Vlan). ), only the broadcast flooding method can be used, which reduces the processing efficiency, complicates the configuration, and wastes the virtual local area network (Vlan) resources on the network side, which is not conducive to network planning.

Therefore, the prior art still has drawbacks that need to be improved and developed. Summary of the invention

The technical problem to be solved by the present invention is to provide a virtual local area network data forwarding method and system, which can realize one-to-many conversion of a single virtual local area network (Vlan) on the network side to multiple different virtual local area networks (Vlans) on the user side, and avoid Broadcast flooding, improve processing efficiency.

In order to solve the above technical problem, the present invention provides a virtual local area network data forwarding method, including: a layer 2 access device constructs a virtual local area network identifier of each service network side, a service information to a user side virtual local area network identifier, and a first mapping of a user side port a relationship table; when the second layer access device forwards the data frame from the network side to the user side, the user side virtual local area network identifier and the user side are found in the first mapping relationship table according to the virtual local area network identifier and the service information of the data frame. After the virtual local area network identifier in the data frame is replaced with the found user-side virtual local area network identifier, the port is sent from the found user-side port.

Further, the service information refers to a service quality level value.

Further, the method further includes: the second layer access device constructs a second mapping relationship table of the virtual local area network identifier of the service user side, the user side port to the network side virtual local area network identifier, and the service information; When the device forwards the data frame from the user side to the network side, according to the data frame The virtual local area network identifier and the user side port find the network side virtual local area network identifier and the network side port in the second mapping relationship table, and replace the virtual local area network identifier in the data frame with the found network side virtual local area network identifier. , issued from the discovered network side port.

In order to solve the above problems, the present invention further provides a virtual local area network data forwarding system, including a Layer 2 Ethernet switching device, where the Layer 2 Ethernet switching device includes a network side port for connecting users, and is used for connecting users. Side port,

The Layer 2 Ethernet switching device further includes a network side port processing module, a first relationship table storage module, and a first configuration module, which are sequentially connected to each other; the network side port processing module is respectively connected to the network side port and the user side port;

The first configuration module is configured to construct a first mapping relationship table between the service network side virtual local area network identifier, the service information to the user side virtual local area network identifier, and the user side port;

The first relationship table storage module is configured to store the first mapping relationship table;

The network side port processing module is configured to receive a data frame from the network side port, and find the user side virtual local area network identifier and the user side port in the first mapping relationship table according to the virtual local area network identifier and the service information of the data frame, After the virtual local area network identifier in the data frame is replaced with the found user side virtual local area network identifier, it is sent from the found user side port.

Further, the service information refers to a service quality level value.

Further, the network side port processing module includes: an extracting unit, a searching unit, and a converting unit; an extracting unit, configured to extract a virtual local area network identifier and a quality of service level value in the data frame; and a searching unit, configured to use the data frame The virtual local area network identifier is used as the virtual local area network identifier on the network side, and the user side virtual local area network identifier and the user side port are searched in the first relationship table by using the virtual local area network identifier and the quality of service level value on the network side; And replacing the virtual local area network identifier of the data frame with the found virtual local area network identifier of the user side, and outputting the data frame from the found user side port.

Further, the Layer 2 Ethernet switching device further includes a user side port processing module, a second relationship table storage module, and a second configuration module that are sequentially connected; the user side port processing module is respectively connected to the network side port and the user side port. Connected; the second configuration module is used to build each service user a second mapping relationship between the user-side port, the user-side port to the network-side virtual local area network identifier, and the service information; the second relationship table storage module, configured to store the second mapping relationship table; a module, configured to: when the data frame is forwarded from the user side to the network side, find the network side virtual local area network identifier and the network side port in the second mapping relationship table according to the virtual local area network identifier of the data frame and the user side port, After the virtual local area network identifier in the data frame is replaced with the found network side virtual local area network identifier, it is sent from the found network side port.

Further, the Layer 2 Ethernet switching device refers to a switching device located at the second layer of the network model as a forwarding basis.

Compared with the prior art, the virtual local area network data forwarding method and system provided by the present invention realizes one-to-many conversion of a single virtual local area network (Vlan) on the network side to multiple different virtual local area networks (Vlans) on the user side. Moreover, the present invention has no broadcast flooding problem, is simpler to implement, improves processing efficiency, simplifies configuration, saves virtual local area network (Vlan) resources on the network side, and is more conducive to network planning. BRIEF abstract

1 is a schematic diagram of a service mode of a networking mode according to the present invention;

Figure 2 is a block diagram showing the structure of the system of the present invention;

3 is a flowchart of processing of a user side interface of the present invention;

4 is a flow chart of the network side interface processing of the present invention.

Preferred embodiment of the invention

The present invention will be further described in detail below in conjunction with the specific embodiments and drawings.

The present invention relates to an effective method for implementing virtual local area network (WLAN) data forwarding for a Layer 2 Ethernet switching device, which uses a network side virtual local area network identifier (Vlan ID) and a service quality of service level value (COS) in the data downlink direction. For the conversion of the virtual local area network (Vlan)-to-many, the virtual local area network identifier (Vlan ID) of the network side carried in the service frame is converted into a virtual local area network identifier (Vlan ID) of the corresponding user side. The method is virtualized on the user side in the data uplink direction. The local area network (Vlan ID) and the user-side port are used to convert the virtual local area network (Vlan) into a multi-to-one relationship, and the virtual local area network identifier (Vlan lD) carried in the service frame is converted into a virtual local area network identifier (Vlan) on the network side. lD).

Take the networking mode shown in Figure 1 as an example. The user-side port of the Layer 2 Ethernet switching device: the first interface, the second interface, and the third interface are connected to two users, namely user 曱 and user B. There are two services: the first service, vlan is a, cos is 1, the first interface of the user-side port; the second service, vlan is b, cos is 2, and the second interface of the user-side port; Convert Vlan to Vlan X on the network side, representing the user. User B has three services, vlan is c d, e; cos is 2, 5, 7 respectively; the third interface of the user-side port, and the service of B needs to convert Vlan to Vlan y on behalf of user B.

In the method of the present invention, the virtual local area network (Vlan)-to-many conversion is performed based on the network side virtual local area network identifier (Vlan ID) and the service quality level value (COS) in the data downlink direction, and the steps are as follows:

100. Associate the service information with the at least one user-side port to generate a first mapping relationship table. The service information includes: a virtual local area network identifier (Vlan ID) and a quality of service level value (COS) of the data frame; the user-side port includes: The virtual local area network identifier (Vlan lD) and the user side port number on the user side. For the first mapping relationship table, see Table 1, the first behavior table header. The specific contents in the table are determined according to the specific settings, which are not shown in Table 1.

Table 1 First mapping relationship table

200. Receive a data frame from the network side port, use the service information in the data frame to search for the corresponding user side port in the first mapping relationship table, and output the data frame from the user side port. This step includes the following sub-steps, as shown in Figure 3;

210. Receive a data frame from a network side port; the data frame is an Ethernet frame;

220. Extract a virtual local area network identifier (Vlan ID) and a quality of service level in the data frame. Value ( COS ) ;

230. The virtual local area network identifier (Vlan ID) in the data frame is used as a virtual local area network identifier (Vlan ID) on the network side, and the virtual local area network identifier (Vlan ID) and the quality of service level value (COS) of the network side are used. Searching the user-side virtual local area network identifier (Vlan ID) and the user-side port number in the first mapping relationship table (ie, the Vlan-to-multiple conversion table);

240. Replace the virtual local area network identifier (Vlan ID) of the data frame with the found virtual local area network identifier (Vlan ID) of the user side;

250. Output the data frame from the detected user side port.

The uplink in the method of the present invention converts the virtual local area network (Vlan) into a many-to-one relationship based on the user-side virtual local area network identifier (Vlan ID) and the user-side port, and converts the virtual local area network (Vlan) of the user side in the service frame into Virtual LAN (Vlan) on the network side. This is achieved by the following steps:

300. Generate a second mapping relationship table, and associate a virtual local area network identifier (Vlan ID) and a network side port on the network side with at least one user side port; the association relationship is shown in Table 2, the first behavior table header, and the specific content in the table is determined according to specific The setting is not shown in Table 2.

Table 2 Second mapping relationship table

400. Receive a data frame from the user side port, and use a virtual local area network identifier (Vlan ID) in the data frame as a virtual local area network identifier (VlanID) on the user side, and use the virtual local area network identifier of the user side and the port number of the user side port. Finding a corresponding network side port and a network side virtual local area network identifier (VlanID) in the second mapping relationship table; and outputting the data frame from the network side port.

This step can be subdivided into the following steps, as shown in Figure 4;

410. Receive a data frame from a user side port, where the data frame may be an Ethernet frame.

420. Extract a virtual local area network identifier (VlanID) in the data frame.

430. The virtual local area network identifier (Vlan ID) in the data frame is used as a virtual office on the user side. The Vlan ID identifies the corresponding network side port and network side in the second mapping relationship table (that is, the Vlan multi-to-one conversion table) by using the virtual local area network identifier of the user side and the port number of the user side port. Virtual local area network identifier (Vlan ID);

440. Replace the virtual local area network identifier (Vlan ID) of the data frame with the discovered virtual local area network identifier (Vlan ID) on the network side;

450. Output the data frame from the found network side port.

The method of the present invention is an effective method for implementing a one-to-many and many-to-one conversion of a virtual local area network (Vlan) for a Layer 2 Ethernet switching device. The method uplinks with a user-side virtual local area network identifier (Vlan ID) and a user-side port. In order to perform a multi-to-one conversion of the virtual local area network (Vlan), the downlink performs a virtual local area network (Vlan)-to-many conversion based on the network side virtual local area network identifier (Vlan ID) and the quality of service level value (COS).

The present invention also provides a virtual local area network forwarding system. As shown in FIG. 2, the Layer 2 Ethernet switching device includes a network side port for connecting to a user, and a user side port for connecting services; the Layer 2 Ethernet switching device further includes a network side port processing module, a first relationship table storage module, and a first configuration module connected in sequence; the network side port processing module is respectively connected to the network side port and the user side port; and further includes a user side port processing module and a second connected in sequence The relationship table storage module and the second configuration module; the user side port processing module is respectively connected to the network side port and the user side port.

Each user-side port is divided into one or several virtual local area networks (Vlans), which represent different services. The COS values of different services on the same user-side port cannot be the same. If the user-side port is divided into several virtual local area networks ( Vlan), the Ethernet frame entering the user side port must be IEEE802.1Qtag. There are multiple network side ports. Each network side port belongs to several virtual local area networks (Vlans). Each virtual local area network (Vlan) represents one user. The Ethernet frame entering the network side port must be IEEE802.1Qtag. The Quality of Service Level value (COS) represents a different service.

a first configuration module, configured to construct a virtual local area network identifier of each service network side, a service information to a user-side virtual local area network identifier, and a first mapping relationship table of the user-side port;

a first relationship table storage module, configured to store the first mapping relationship table; The associated service information and the at least one user-side port; that is, the relationship between the network-side virtual local area network identifier (Vlan ID) and the one-to-many converted user-side virtual local area network identifier (Vlan ID) and the output port is saved, and the network side is virtualized. The LAN ID (Vlan ID) and Quality of Service Level (COS) are indexed.

a network side port processing module, configured to receive a data frame from the network side port, and find a user side virtual local area network identifier and a user side port in the first mapping relationship table according to the virtual local area network identifier and the service information of the data frame, After the virtual local area network identifier in the data frame is replaced with the found user side virtual local area network identifier, it is sent from the found user side port. The network side port processing module includes: an extracting unit, a searching unit, and a converting unit;

An extracting unit, configured to extract a virtual local area network identifier (Vlan ID) and a quality of service level value (COS) in the data frame;

a searching unit, configured to use a virtual local area network identifier (Vlan ID) of the data frame as a virtual local area network identifier (Vlan ID) on the network side, using a virtual local area network identifier (Vlan ID) of the network side, and the quality of service level value (COS) Searching for the user side virtual local area network identifier (Vlan ID) and the user side port in the first relationship table;

And a converting unit, configured to replace the virtual local area network identifier (Vlan ID) of the data frame with the discovered virtual local area network identifier (Vlan ID) of the user side, and output the data frame from the found user side port.

a second configuration module, configured to construct a second mapping relationship table between the user-side virtual local area network identifier, the user-side port to the network-side virtual local area network identifier, and the service information;

a second relation table storage module, configured to store the second mapping relationship table; the second relationship table is configured to associate a virtual local area network identifier (Vlan ID) and a network side port on the network side with at least one user side port; The relationship between the user-side virtual local area network identifier (Vlan ID) and the multi-to-one converted network-side virtual local area network identifier (Vlan ID) and the output port is saved.

The user side port processing module is configured to: when the data frame is forwarded from the user side to the network side, find the network side virtual local area network identifier and the network in the second mapping relationship table according to the virtual local area network identifier of the data frame and the user side port. The side port is sent from the found network side port after replacing the virtual local area network identifier in the data frame with the found network side virtual local area network identifier. The Layer 2 Ethernet switching device for the present invention includes a Layer 2 Ethernet switch, a DSLAM, an EPON, a GPON, and the like, all of which are based on the MAC address of the second layer of the network model.

It should be understood that the specific embodiments described above are only illustrative of the invention and are not to be construed as limiting the invention, and those skilled in the art can Both the principles and the features disclosed in the present invention are intended to be within the scope of the present invention.

INDUSTRIAL APPLICABILITY A virtual local area network forwarding method and system provided by the present invention realizes a single virtual local area network (Vlan) on the network side to the user by using the first relationship table to record service information and at least one user-side port association relationship. One-to-many conversion of multiple different virtual local area networks (Vlans) on the side; Moreover, the present invention has no broadcast flooding problem, is simpler to implement, improves processing efficiency, simplifies configuration, and saves virtual local area network on the network side ( Vlan ) Resources are more conducive to network planning.

Claims

Claim

A virtual local area network data forwarding method, characterized in that

The Layer 2 access device constructs a first mapping relationship table between the service network side virtual local area network identifier and the service information to the user side virtual local area network identifier and the user side port; when the second layer access device forwards the data frame from the network side to the user side, Locating the user-side virtual local area network identifier and the user-side port in the first mapping relationship table according to the virtual local area network identifier and the service information of the data frame, and replacing the virtual local area network identifier in the data frame with the found user-side virtual After the LAN ID is identified, it is sent from the discovered user-side port.

2. The method of claim 1 wherein

The service information refers to a service quality level value.

The method according to claim 1 or 2, wherein the method further comprises: the layer 2 access device constructs a virtual local area network identifier of each service user side, a user side port to a network side virtual local area network identifier, and a service a second mapping relationship table of the information; when the layer 2 access device forwards the data frame from the user side to the network side, the virtual local area network identifier of the data frame and the user side port are found in the second mapping relationship table. The network side virtual local area network identifier and the network side port are sent out from the found network side port after replacing the virtual local area network identifier in the data frame with the found network side virtual local area network identifier.

A virtual local area network data forwarding system, comprising a Layer 2 Ethernet switching device, where the Layer 2 Ethernet switching device includes a network side port for connecting to a user, and a user side port for connecting to the service, wherein

The network side port processing module is configured to receive a data frame from the network side port, and find the user side virtual in the first mapping relationship table according to the virtual local area network identifier and the service information of the data frame. The local area network identifier and the user side port are sent from the found user side port after the virtual local area network identifier in the data frame is replaced with the found user side virtual local area network identifier.

5. The system of claim 4 wherein:

The service information refers to a service quality level value.

6. The system of claim 5 wherein:

The network side port processing module includes: an extracting unit, a searching unit, and a converting unit; an extracting unit, configured to extract a virtual local area network identifier and a quality of service level value in the data frame; and a searching unit, configured to use the virtual local area network of the data frame Identifying, as the network side, a virtual local area network identifier, using the virtual local area network identifier and the quality of service level value of the network side, searching for the user side virtual local area network identifier and the user side port in the first relationship table;

And a converting unit, configured to replace the virtual local area network identifier of the data frame with the found virtual local area network identifier of the user side, and output the data frame from the found user side port.

7. The system of claim 4 or 5, wherein

The Layer 2 Ethernet switching device further includes a user side port processing module, a second relationship table storage module, and a second configuration module, which are sequentially connected to each other; the user side port processing module is respectively connected to the network side port and the user side port;

The second configuration module is configured to construct a second mapping relationship table of each user side virtual local area network identifier, a user side port to a network side virtual local area network identifier, and service information;

The second relationship table storage module is configured to store the second mapping relationship table;

The user side port processing module is configured to: when the data frame is forwarded from the user side to the network side, find the network side virtual local area network identifier in the second mapping relationship table according to the virtual local area network identifier of the data frame and the user side port. And the network side port, after the virtual local area network identifier in the data frame is replaced with the found network side virtual local area network identifier, is sent from the found network side port.

8. The system of claim 7 wherein:

The Layer 2 Ethernet switching device refers to a switching device located at the second layer of the network model as the forwarding basis.