WO2005015836A1

WO2005015836A1 - Switching system and switching method based on the switching of service grade

Info

Publication number: WO2005015836A1
Application number: PCT/CN2004/000464
Authority: WO
Inventors: Jie Yu; Kai Ma
Original assignee: Zte Corporation
Priority date: 2003-08-06
Filing date: 2004-05-10
Publication date: 2005-02-17
Also published as: RU2006106707A; CN1299469C; CN1581789A; RU2354058C2

Abstract

Switching system based on the switching of service grade, include multiple RPR equipment which compose one RPR ring, service classification processing unit, upper switching unit and dispatching unit; RPR frame processing unit dispose the RPR frame which come from loop circuit; service classification processing unit done the service grade classification for the Ethernet service which come from local port; upper switching unit select output ring in shortest route principle; dispatching unit 9 dispatch the non-local service from the RPR loop circuit and the classified service, and output from the loop. The present invention realize bridging of Ethernet service and RPR loop circuit by the classification of service and unified dispatching for all the service, provide a kind of switching system and switching method aim at RPR technique, in addition, the present invention can fusion many kind of service classification technique to classified service frame, make different dispose to different grade of service, thereby it take many kind of strategies for providing many kinds of service and price.

Description

Switching system and switching method based on service level switching

The present invention relates to data communication technology, and in particular, to a flexible packet ring (RPR) technology of a metropolitan area network, and in particular, it relates to adapting an Ethernet service to three types of service levels in the RPR technology to System and method for scheduling at different service levels.

Background technique

Resilient packet ring RPR technology is an emerging technology, the purpose of which is to build a bandwidth with reusable bandwidth, each site has a fair algorithm to ensure the bandwidth occupancy of each site, with ring protection and quality of service (QoS) ) Capable data transmission networks, which are mainly targeted at metropolitan backbone ring networks and city i or access ring networks. In December 2000, the IEEE specifically established the IEEE802.17 standard group, and formulated an RPR MAC (Media Access Control) layer standard based on RPR technology that can form RPR rings.

One of the most important features of RPR technology is to classify the transmitted services. The services are divided into three categories: people, B, and C, of which A is real-time services; B is divided into two categories: B-CIR (Committed Information Rate) For committed rate class services, B-EIR (Excess Information Rate) is a service that exceeds the committed rate class; Class C is a best effort service. The above three types of services are distinguished by the Service Class defined in the frame structure.

At present, many services are carried on Ethernet. If RPR technology is used to build a metropolitan area network, how to bridge Ethernet services to RPR loops and adapt Ethernet services to A / B / On the third level of service class C, it is an urgent problem to ensure that user services are transmitted according to the priority level. No related technical literature has been found.

Summary of the invention

The technical problem to be solved by the present invention is to provide a switching system based on service level switching and A switching method, including a service level-based switching and bridging system between an Ethernet system and an elastic packet ring network, and a service level-based scheduling system, including a service classification method for cooperating Ethernet services into an elastic packet ring network and coexistence The preferred method when multiple classification methods are used to bridge the Ethernet service to the elastic packet ring loop.

The technical scheme of the present invention is as follows:

A switching system based on service level switching includes multiple RPR devices. The RPR device includes two RPR ring-side ports and a group of user-side ports. The RPR device forms an RPR ring through the RPR ring-side ports. The user-side port sends and receives Ethernet service frames; characterized in that the RPR device further includes an RPR frame processing unit, a service classification processing unit, a ring switching unit, and a scheduling unit; the RPR frame processing unit is configured to The RPR frame received by the RPR loop-side port $ Γ is processed, and the RPR frame is distributed to the corresponding user-side port or sent to the primary transmission queue or secondary transmission queue according to whether the RPR frame is a downlink service of the site. In

The service classification processing unit is configured to classify an Ethernet service frame input from a user-side port into a service level, and send the service class to a corresponding service queue;

The ring switching unit is configured to select an output ring of a service frame, and send the service frame to a service queue at a corresponding level of the output ring to wait in a queue;

The scheduling unit is configured to uniformly schedule the service frames in the primary transmission queue and the secondary transmission queue, and the service frames in the service queues of different levels on the output ring, and output them through the RPR loop-side port.

The service level switching-based switching system further includes a set of service classification mode configuration registers corresponding to the user-side port of the RPR device; the service classification mode configuration register is used to store the service classification of the corresponding user-side port Mode, providing the service classification processing unit with a classification mode of a service frame input from a corresponding user-side port.

A switching method based on service level switching includes: Step 1: Determine whether the RPR frame is a loop-down service of the site according to the destination address of the RPR frame input from the RPR loop. If so, distribute the RPR frame to the corresponding user-side port; if not, then Send the RPR frame to the primary sending queue or the secondary sending queue according to the service level of the RPR frame; go to step four;

Step 2: Classify the service level of the Ethernet service frame input from the user-side port; Step 3: Select the output ring of the service frame and send the service frame to the service queue at the corresponding level of the output ring;

Step 4. The service frames in the primary transmission queue and the secondary transmission queue, and the service frames in the service queues of different levels of the output ring are uniformly scheduled, and output to the corresponding RPR ring.

The switching system and switching method based on service level switching of the present invention realizes bridging of Ethernet services and RPR loops by classifying services and uniformly scheduling all services, and provides an effective RPR technology Switching system and switching method, the present invention can integrate a variety of service classification technologies, classify end users and perform different processing on different levels of services, thereby providing different services and prices for different levels of users. Multiple strategies.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of an exchange system of the present invention;

FIG. 2 is a schematic flowchart of an exchange method according to the present invention.

detailed description

The technical solution of the present invention is described in further detail below with reference to the drawings and embodiments.

The switching system based on service level switching of the present invention, as shown in FIG. 1, includes an RPR ring composed of multiple RPR devices. The RPR device includes an RPR frame processing unit, a service classification processing unit, a ring switching unit, a scheduling unit, Two RPR loop-side ports and a set of user-side ports. The frames input and output from the RPR loop-side ports are RPR frames, and the RPR frames carry the service level classification identifier, indicating that The service level of the RPR frame is human, B, or C; and the user-side port is generally an Ethernet port. The frames input and output from this port are Ethernet frames, and the frame structure does not include A, B, and C service level classifications. Logo. Multiple RPR devices form an RPR ring through the RPR loop-side port. The main working modes of the RPR device are switching mode and routing mode. The following embodiments are classified for services in the switching mode, but they are also applicable to the routing mode. RPR equipment.

The RPR frame input from the RPR loop-side port is processed in the RPR frame processing unit, and the RPR frame processing unit judges whether the RPR frame is a loop-down service of the site according to the destination MAC address of the RPR frame. If yes, then According to the extended destination address in the RPR frame structure and the MAC address table of the correspondence between the destination MAC address and the user-side port, the RPR frame is distributed to the corresponding user-side port. If the RPR frame is not a downlink service of the site, the RPR frame is placed in the primary transmission queue PTQ or the secondary transmission queue STQ according to its service level classification identifier.

The Ethernet service frame input from the user-side port of the RPR device is classified by the service classification processing unit into A / B / C service levels. The service frame classified by the service level is output to the ring switching unit, and the ring switching unit selects the output ring of the service frame, and outputs the service frame to the corresponding level service queue of the corresponding output ring, waiting for scheduling. The services in the primary transmission queue PTQ and the secondary transmission queue STQ and the services in the output ring A, B, and C three-level service queues are uniformly scheduled by the scheduling unit and output from the RPR loop-side port.

The service classification processing unit performs classification processing on the Ethernet service frame in two ways. One is to classify the Ethernet service frames directly. Because the Ethernet frame structure does not carry the service level classification identifier of the RPR, it is necessary to classify according to the information of the Ethernet frame header, and put the corresponding service level identifier into the Ethernet. In the control field corresponding to the service frame, the Ethernet service frame is then converted into an RPR frame before scheduling. The other is to convert the Ethernet service frame into an RPR frame before classifying the service level. At this time, the service level identifier in the RPR frame is given a default service level, such as a class C service. Then, a service level classification process is performed, and a service level identifier in the RPR frame is re-assigned. In the switching system, a set of service classification mode configuration registers may also be included, corresponding to each user-side port, and used to store the service-level classification mode of each user-side port. After the Ethernet frame input from the user-side port enters the service classification processing unit, the service classification processing unit queries the service classification mode configuration register corresponding to the port, obtains the service classification mode of the service frame input from the port, and then the service classification processing unit Business classification is performed according to the corresponding business classification model.

FIG. 2 shows a flow chart of a switching method based on service level switching according to the present invention. First, it is determined whether a service frame is input from an RPR loop-side port or a user-side port. If it is input from an RPR loop-side port, then Perform RPR frame processing; if it is a service frame input from a user-side port, perform service classification processing and ring exchange processing; and finally, perform scheduling processing on the above service frame. Each step is described in detail below.

The step of processing the RPR service frame input from the RPR ring-side port includes: determining whether the RPR frame is a ring service of the site according to the destination MAC address of the RPR frame, and for the ring service of the site, Distribute the RPR frame to the corresponding user-side port. For non-loop services on the site, send the RPR frame to the primary transmission queue PTQ or secondary transmission queue STQ according to the service class classification identifier. If it is class A The service is sent to the primary transmission queue PTQ; for the type B and C services, it is placed in the secondary transmission queue STQ.

Classifying the Ethernet service frames input from the user-side port refers to classifying the A / B / C service levels of the Ethernet service frames corresponding to the RPR ring.

There are two types of processing methods for Ethernet service frames. One is to directly classify the Ethernet frames, and then convert the Ethernet frames into RPR frames before performing the scheduling operation. One is to convert the Ethernet frame into an RPR frame before classifying the service level. That is, a new RPR frame is created, and the content of the Ethernet frame is filled into the corresponding part of the RPR frame. At this time, the services carried in the RPR frame Wait The level identifier is assigned a default service level identifier value, such as a class C service, and then the service level classification process is performed, and the value is re-assigned.

There are several methods for classifying Ethernet service frames: port-based service classification methods; virtual LAN identification VLAN ID-based service classification methods; source / destination MAC address group-based service classification methods; and IEEE802. 17 A method for classifying the mapping of the IEEE 802.3 Class of Service (COS) bits and the IEEE 801.7 A, B, and C services formulated in the standard.

The classification of each service is explained below.

The port-based service classification method refers to classifying services according to the port number of the user-side port of the input service frame. Specifically, a default service category configuration item is set for each user-side port, as shown in Table 1. A service frame input from a user-side port is configured with a service level according to a default service category configuration item of the port. If the default service class of the port is 00, the service frame of the port is classified as a class C service; if the default service class of the port is 01, the service frame of the port is classified as a class B service; The provincial service category is 10, and the service frame of the port is classified as A1 service; if the default service category of the port is 11, the service frame of the port is classified as AO service. In the standard, Class A services are divided into two sub-categories, A1 and AO. Among them, the class of AO services is higher.

Table 1

Variable name definition

Port ID User-side port number

Service Class default service level

00: Class C

01: Class B 10: Al

11: AO class

The VLAN ID-based service classification method refers to classifying according to the virtual LAN identification VLAN ID number carried by the service frame input from the user-side port. Specifically, the mapping table of the VLAN ID number and the service level is set, as shown in Table 1. The service frame input from the user-side port is configured to the corresponding service level according to the mapping of the VLAN ID number and the service level carried by the user frame. If the service frame is marked with 802.1Q and the VLAN ID is valid, the VLAN ID number is used for service classification; if the VLAN ID is invalid, query Table 3 to obtain the default VLAN ID number of the user-side port. And use it as the VLAN ID number of the service frame, and then classify the service. If the VLAN ID is 00, the service frame of the port is classified as a class C service; if the VLAN ID is 01, the service frame of the port is classified as a class B service; if the VLAN ID is 10, the port The service frame of the port is classified as a type A1 service; if the VLAN ID number is 11, the service frame of the port is classified as a type of AO service.

Table 2

Variable name definition

VLAN ID Virtual Office i or Network ID

Serv ice Clas s default service level

00: Class C

01: Class B

10: Class A1

11: AO class

table 3

Variable name definition Port ID User-side port number

PVID The default VLAN ID of the port

The service classification method based on the source / destination MAC address group is to classify the service frame according to the source MAC address and the destination MAC address carried in the service frame. Specifically, it sets the mapping table between the source / destination MAC address group and service class As shown in Table 4, the source / destination MAC address group can be a MAC-MAC (that is, the source MAC address and the destination MAC address are specific) type MAC address group or MAC-ANY (that is, the source MAC address is specific, However, the destination MAC address is arbitrary) type MAC address group or ANY-MAC (that is, the destination MAC address is specific, but the source MAC address is arbitrary) type MAC address group. The service frame input from the user-side port is according to Table 4. The mapping table shown below performs service classification. First, the destination MAC address and source MAC address are extracted from the service frame input by the user-side port, and then MAC flow matching is performed. First, MAC-MAC type MAC flow matching is performed. DesMAC + SrcMAC in 4 matches. If the match is successful, the configuration value of the ServiceClas s item corresponding to the entry is used as the service level of the service frame. If the match is not successful, MAC-ANY type MAC flow matching is performed, that is, matching. Whether the source MAC address is equal to SrcMAC and the destination MAC address is equal to DesMAC equal to full F. If the match is successful, the configuration value of the ServiceClass item corresponding to the entry is used as the service level of the service frame; if the match is not successful, ANY-MAC is performed Type MAC flow matching, that is, whether the source MAC address is equal to SrcMAC is equal to full F, and the destination MAC address is equal to DesMAC. If the match is successful, the configuration value of the ServiceClass item corresponding to the entry is used as the service level of the service frame, otherwise it is considered The service level of this service frame is Class C.

Table 4

Variable name definition

SrcMAC source MAC address. When the value is all F, the MAC address is arbitrary. DesMAC destination MAC address. When the value is full F, the MAC address is arbitrary.

Service Class

00: Class C

01: Class B

10: Class A1

11: AO class

A method for classifying according to the mapping of IEEE802.3 service level COS bits and IEEE802.17 A, B, and C services includes: determining whether a service frame is marked with 802.1Q, and if a service frame is marked with 802.1Q, then According to the value of the COS bit in the tag, the A / B / C service mapping table of 802.1P-802.17 is searched, and the specific service classification value is obtained as the service level of the service frame; if the service frame does not carry 802 1Q flag, the value of the COS bit is considered to be 0, and then the mapping table is looked up to obtain the service level of the service frame. The mapping table of the 802. IP- 802. 17 A / B / C service records the correspondence between the 802.3 COS bit and the 802. 17 A / B / C service.

There are multiple methods for classifying Ethernet frames for services, which can coexist in the same system. The present invention also provides a preferred method based on ports, because all services enter RPR through a certain user-side port. Ring, so you can control the service classification method at the user-side port. Specifically, a port-based service classification mode configuration register is set on each port. As shown in Table 5, when a service frame enters from a user-side port, the service classification mode configuration register of the user-side port is first queried, and then according to For the specific service classification mode, the corresponding method is used for service classification.

table 5

Variable name definition

Port ID User-side port number SCMode business classification mode configuration register

00: Differentiate the service level according to 802. IP, which is the default value

01: Differentiating service levels based on ports

10: Differentiate service levels based on Vlan ID

11: Differentiate service levels based on MAC address groups

After the service frame is processed by the service classification, the ring exchange processing is performed, including: selecting an output ring of the service frame according to the shortest path principle to the destination site, and sending the service frame to the corresponding output ring respectively.

A / B / C service queues are waiting in the queue.

The scheduling processing steps are for the non-local service frames entering from the RPR loop, that is, the service frames in the primary transmission queue PTQ and the secondary transmission queue STQ, and the A / B / C service queues entering from the user-side port. The service frames are uniformly scheduled, and the service frames are output from the corresponding output loop in the order of PTQ / STQ / A / B / C.

A preferred embodiment of the present invention is given below.

When a service frame enters from a port on the user side, service classification processing is performed first.

1. Business classification process

1) Check from which port the service frame enters, assuming that it enters from port i;

2) Find the service classification mode configuration register of port i to obtain the service classification mode value of port i, as shown in the SCMode value in Table 5. If the value is 00, it means to classify the service frame according to 802.1P, then go to step 3. ); If the value is 01, it means to classify the service frame according to the port, then go to step 4); If the value is 10, it means to classify the service frame according to the Vlan ID, then go to step 5); If the value is 11, indicating that the service frame is classified according to the MAC address group, and then go to step 6).

3) If the service frame is marked with 802.1Q, then according to the value of the COS bit in the mark, look up the mapping table of 802.1P-802.17 A / B / C service, and obtain the specific service classification value as the Business frame If the service frame is not marked with 802.1Q, the value of the COS bit is considered to be 0, and then a search is performed to obtain the service level of the service frame; go to step 7).

4) Find the default service class configuration of port i. As shown in Table 1, the specific service classification value obtained is used as the service level of the service. Then go to step 7).

5) If the service frame is marked with 802.1Q, determine whether the VLAN ID in the tag is valid, and if it is valid, search for a VLAN ID-based service category configuration according to the VLAN ID value, and obtain a corresponding service category value as the service The service level of the frame; if it is invalid, the default VLAN ID value of the port is taken as the VLAN ID of the service frame, and a search is performed to obtain the service level of the service frame; then, go to step 7).

6) The service type configuration is searched according to the source MAC address and the destination MAC address of the service frame. If a matching item is found, the service class value corresponding to the item is used as the service level of the service. Otherwise, the default service is used. Category value-category C. Then go to step 7).

7) Perform ring exchange processing.

2. Shelf exchange processing

1) Find the ring selection table according to the destination MAC address carried in the service frame. The ring selection table provides the correspondence between the destination MAC address and the RPR ring selection obtained based on the shortest path principle for the MAC address of the current RPR site of the user. Get the output RPR loop j of the service frame by looking up the table.

2) The service level obtained by the service classification process is sent to the A / B / C service queue of the RPR loop j.

3) Convert the Ethernet service frame into an RPR frame and wait for scheduling processing.

3. RPR frame processing

Processes RPR frames coming from the RPR loop.

1) Check which loop of the RPR the service frame enters, assuming loop k; 2) Determine whether the destination MAC address of the RPR frame of the service belongs to this site, and if yes, go to step 3), otherwise go to step 5).

3) Extract the destination MAC address of the 802.3 frame that is encapsulated in the RPR frame, and search the lower ring MAC address table. The lower ring MAC address table contains the correspondence between the MAC address and the local port, and obtain the local port number that the service frame needs to output. m.

4) 802.3 frames are stripped from the RPR frame and output from the local port m. The process ends.

5) The RPR frame is placed in the primary transmission queue PTQ and the secondary transmission queue STQ according to the service level in the RPR frame, of which the Class A service is placed in the PTQ, and the other services are placed in the STQ. Then the scheduling process is performed.

4. Scheduling

Service frames of 5 queues of PTQ / STQ / A / B / C are scheduled in turn, and output from the corresponding output loop. This scheduling process follows the definition of IEEE802.17.

The system and method of the present invention is an effective switching system for RPR technology. The method can integrate multiple service classification technologies, classify services to end users, and perform different processing for different levels of services, thereby different levels of services. Of users provide different services and prices bring multiple strategies.

Although the business category classification method of the present invention has been illustrated and described in the specific embodiments of the present invention, it is obvious that the present invention is not limited by this classification method, and does not deviate from the technical solution of the present invention determined by the appended claims Under the conditions of the concept and scope, those skilled in the art will consider many amendments, replacements, changes, substitutions and equivalent contents, and these contents should all belong to the protection scope of the present invention.

Claims

Claim

1. A switching system based on service level switching, including multiple RPR devices, the RPR device including two RPR loop-side ports and a group of user-side ports, and the RPR device forming an RPR ring through the RPR loop-side ports Sending and receiving Ethernet service frames through a user-side port; characterized in that the RPR device further includes an RPR frame processing unit, a service classification processing unit, a ring switching unit, and a scheduling unit;

The RPR frame processing unit is configured to process an RPR frame input from an RPR loop-side port, and distribute the RPR frame to a corresponding user-side port, or send the RPR frame according to whether the RPR frame is a downlink service of the site. To the primary or secondary transmission queue;

The ring switching unit is configured to select an output ring of the service ring, and send the service frame to a service queue at a corresponding level of the output ring to wait for scheduling;

2. The switching system based on service level switching according to claim 1, further comprising a set of service classification mode configuration registers corresponding to the user-side port of the RPR device; the service classification mode configuration register is used for Storing the service classification mode of the corresponding user-side port, and providing the service classification processing unit with the classification mode of the service frame input from the corresponding user-side port.

3. The switching system based on service level switching according to claim 1 or 2, characterized in that the service classification processing unit further comprises converting the input Ethernet frame into an RPR frame, and further Line business level classification.

4. The switching system based on service level switching according to claim 3, wherein the service level classification method of the service classification processing unit is a port-based service classification method, that is, based on the user-side port of the input service frame The port number is used for service classification. Specifically, a default service category configuration item is set for each user-side port; a service frame input from the user-side port is configured with a service level according to the port's default service category configuration item.

5. The switching system based on service level switching according to claim 3, wherein the service level classification method of the service classification processing unit is a service classification method based on a virtual local area network identifier, that is, based on an input from a user-side port The classification of the virtual local area network identifiers carried in the service frames is as follows: setting a mapping table of the virtual local area network identifiers and service levels; if the service frame input from the user-side port is marked with 802.1Q, and the virtual local area network identifiers therein are valid Using the virtual local area network identifier to search the above mapping table to obtain the service level of the service frame; if the virtual local area network identifier is invalid, using the port's default virtual local area network identifier as the virtual local area network identifier of the service frame, and searching the mapping table, Obtain the service level of the service frame.

6. The switching system based on service level switching according to claim 3, wherein the service level classification method of the service classification processing unit is a service classification method based on a source / destination MAC address group, that is, according to a service The source MAC address and the destination MAC address carried in the frame are used to classify the service level of the service frame. Specifically, a mapping table between the source / destination MAC address group and the service class is set, and the destination MAC address and The source MAC address is matched with the source / destination MAC address in the mapping table for MAC flow matching. If the match is successful, the corresponding service level item is the service frame of the service frame. Service level; if the match is unsuccessful, the default service level value is used as the service level of the service frame.

7. The switching system based on service level exchange according to claim 6, characterized in that the source / destination MAC address group can be a specific source MAC address and a destination MAC address, or the source MAC address is specific and the purpose is The MAC address is arbitrary, or the destination MAC address is specific and the source MAC address is arbitrary.

8. The switching system based on service level switching according to claim 3, wherein the service level classification method of the service classification processing unit is A, B, C according to IEEE802.3 service level bits and IEEE802.17 A method for classifying a service mapping is specifically: determining whether a service frame is marked with 802.1Q, and if it is marked with 802.1Q, searching for 802.1P-802.17A according to the value of the service level bit in the tag / B / C service mapping table, to obtain the specific service classification value as the service level of the service frame; if the service frame does not carry the 802.1Q mark, consider that the value of the service level bit is 0, and then look up the above mapping table, Obtain the service level of the service frame.

9. A switching method based on service level switching, which comprises the following steps: Step 1: judging whether the RPR frame is a ring service of the site according to the destination address of the RPR frame input from the RPR loop, If it is, then distribute the RPR frame to the corresponding user-side port; if not, send it to the primary or secondary transmission queue according to the service level of the RPR frame; go to step four;

Step 4. For the service frames in the primary transmission queue and the secondary transmission queue, and the Service frames in different levels of service queues are uniformly scheduled and output to the corresponding RPR ring.

10. The exchange method based on service level exchange according to claim 9, characterized in that, in the first step, if the RPR frame is a loop-down service of this site, extracting the extended encapsulation 802 in the RPR frame. The destination MAC address of the 3 frames; look up the MAC address table of the loop to obtain the user-side port number that the service frame needs to output; strip the 802.3 frame from the RPR frame and output from the user-side port.

11. The exchange method based on service level exchange according to claim 9, characterized in that, in the first step, if the RPR frame is a type A service, it is sent to the primary transmission queue; if the RPR frame is a type B service Or Class C services, put them in the secondary transmission queue.

12. The switching method based on service level switching according to claim 9, wherein the second step further comprises: before classifying the service level, converting the input Ethernet frame into an RPR frame, that is, creating a new RPR Frame, the content of the Ethernet frame is filled in the corresponding part of the RPR frame, and the service level identifier in the RPR frame is given a default service level identifier value.

13. The exchange method based on service level exchange according to claim 12, wherein the service level classification method in step 2 is a port-based service classification method, that is, according to a port number of a user-side port of an input service frame To classify the service, specifically: set a default service category configuration item for each user-side port; configure the service level of the service frame input from the user-side port according to the port's default service category configuration item. The exchange method based on service level exchange according to claim 12, characterized in that: The service level classification method of step 2 is a service classification method based on a virtual local area network identifier, that is, classifying according to a virtual local area network identifier carried by a service frame input from a user-side port, specifically: setting a mapping between a virtual local area network identifier and a service level Table; if the service frame input from the user-side port has

802.1Q mark, and the virtual local area network identifier is valid, then use the virtual local area network identifier to search the above mapping table to obtain the service level of the service frame; if the virtual local area network identifier is invalid, the port's default virtual local area network identifier As the virtual local area network identifier of the service frame, look up the mapping table to obtain the service level of the service frame.

15. The exchange method based on service level exchange according to claim 12, wherein the service level classification method in step 2 is a service classification method based on a source / destination MAC address group, that is, according to a service frame carried The source MAC address and the destination MAC address classify the service level of the service frame, specifically: setting a mapping table of the source / destination MAC address group and the service class, and extracting the destination MAC address and source MAC address from the service frame input by the user-side port, Perform MAC flow matching with the source / destination MAC address in the mapping table. If the match is successful, the corresponding service level item is the service level of the service frame. If the match is unsuccessful, the default service level value is used as the service frame. Business level.

16. The exchange method based on service level exchange according to claim 15, wherein the group or the source MAC address is specific, but the destination MAC address is an arbitrary MAC address group, or the destination MAC address is specific Yes, but the source MAC address is an arbitrary MAC address group.

17. The exchange method based on service level exchange according to claim 12, wherein the service level classification method of step two is based on IEEE802.3 service level bit and IEEE802.17 The method for classifying the mapping of people, B, and C services is specifically: determining whether the service frame is marked with 802.1Q, and if it is marked with 802.1Q, the value of the service level bit in the mark is searched for 802.1P -802. 17 A / B / C service mapping table to obtain the specific service classification value as the service level of the service frame; if the service frame does not carry the 802.1Q mark, the value of the service level bit is considered to be 0, Then look up the above mapping table to obtain the service level of the service frame.

18. The switching method based on service level switching according to any one of claims 12 to 17, wherein the step 2 further comprises: setting a port-based service classification mode configuration register on each port; When the user-side port enters, query the service classification mode configuration register of the user-side port, and then perform service classification according to the specifically configured service classification mode.

19. The exchange method based on service level exchange according to claim 9, characterized in that said step three further comprises: searching the upper ring selection table according to the destination MAC address carried in the service frame, and the upper ring selection table provides the destination MAC Correspondence between the address and the RPR loop selection obtained from the principle that the MAC address of the RPR site where the user is located is the shortest path; get the output RPR loop of the service frame; send the service frame according to the service level obtained through the service classification process To the corresponding service queue of the output RPR loop.

20. The exchange method based on service level exchange according to claim 9, characterized in that the principle of scheduling in step 4 is: according to the primary transmission queue / secondary transmission queue / type A service queue / type B service The order of the queue / type C service queue, the service frames in the above service queue are sequentially scheduled, and output from the corresponding output RPR loop.