CN1937568B - A method and device for implementing message priority mapping - Google Patents

Abstract

The invention discloses a method for realizing message priority mapping, which includes setting a DMAC address-to-COS value mapping table; obtaining the DMAC address of the currently received Ethernet message; matching in the DMAC address-to-COS value mapping table, and judging Whether there is a matching DMAC address-to-COS value mapping entry. If so, obtain the COS value recorded in the entry according to the successfully matched entry, and use the obtained COS value to replace the currently received Ethernet message. The COS value is matched according to the COS value, and the priority of the RPR data packet to which the current Ethernet packet is encapsulated is obtained through mapping. The invention also provides a device for realizing message priority mapping. The method and device provided by the present invention can flexibly map Ethernet packets to RPR data packets with appropriate priority, adapt to the needs of RPR ring network bearing services, ensure the service quality of users, and improve service stability sex.

Description

A method and device for implementing message priority mapping

technical field

The invention relates to data communication technology, in particular to a method and device for realizing message priority mapping.

Background technique

Resilient Packet Ring (RPR) is a Media Access Control (MAC) protocol defined by the IEEE802.17 working group. In a resilient packet ring (RPR) solution in the prior art, the RPR device usually encapsulates the received Ethernet message as a data payload into a data message in the RPR frame format. Here, the RPR frame format includes a basic frame format and an extended frame format.

In the prior art, the priority of the Ethernet message is usually obtained according to a Class of Service (COS, Class of Service) value mapping method. The RPR device implements the mapping from the priority of the Ethernet packet to the priority of the RPR data packet through the COS value carried in the Ethernet packet; for the Ethernet packet that does not carry the COS value, the RPR device Ethernet packets are mapped to fixed priorities. Usually, to prevent uncertain packets from occupying high-priority bandwidth, Ethernet packets without COS values are generally mapped to low-priority packets.

The priority of the RPR data message is carried in the service class (Service Class, SC) of the base control (BaseControl) field of the message. The priorities of RPR data packets are divided into four categories, including A0, A1, B, and C, among which the priority of A0 is the highest. Packets with different priorities have different occupied bandwidths and priorities. When the RPR ring network is congested, the Class C priority packets will be discarded by the RPR device due to the adjustment of the fairness algorithm.

Therefore, in practical applications, some important Ethernet packets are usually mapped to RPR data packets with Class C priority, such as multicast protocol packets such as OSPF, DHCP, and VRRP, in practical applications. arts. As a result, when the RPR ring network is congested, the RPR device discards the RPR data packets mapped to important multicast protocol packets such as OSPF, DHCP, and VRRP, which makes the RPR ring network unable to carry services normally and seriously affects the The quality of service for users and the stability of service.

It can be seen that, at the RPR device, the priorities of the RPR data packets are only mapped according to the COS value carried in the Ethernet packets, which cannot meet the application requirements of the RPR ring network. In the RPR ring network, a more flexible priority mapping method is needed, so that Ethernet packets can be mapped to RPR data packets with appropriate priorities according to the requirements of the actual operating environment of the network.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method and device for implementing packet priority mapping, which can flexibly map Ethernet packets to RPR data packets with appropriate priorities.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A method for implementing message priority mapping, applied to RPR network equipment, setting a mapping table from a DMAC address to a COS value; perform the following steps:

Step 601: When the RPR network device receives an Ethernet message, it needs to obtain the DMAC address of the currently received message before encapsulating the Ethernet message into a data message in the RPR extended frame format;

Step 602: According to the DMAC address obtained in step 601, perform a match in the DMAC address to COS value mapping table, and judge whether there is a matching DMAC address to COS value mapping entry, and if so, perform step 603; otherwise, perform step 603 604;

Step 603: Obtain the COS value recorded in the entry according to the successfully matched entry, replace the COS value carried in the currently received Ethernet message with the obtained COS value, and execute step 604;

Step 604: According to the COS value matching, the priority of the RPR data packet to which the current Ethernet packet is encapsulated is obtained through mapping;

Step 605: Add the priority obtained by the current mapping to the service level (SC) in the basic control field of the RPR data message that encapsulates the currently received Ethernet message, and encapsulate the RPR data of the Ethernet message The packet is mapped to the priority obtained by the current mapping.

A device for implementing message priority mapping, which includes a DMAC address acquisition unit 21, a priority mapping unit 72, and an encapsulated RPR data message unit 33; wherein the priority mapping unit 72 includes: a DMAC address matching unit 721 and a COS value matching unit 722;

Wherein, the DMAC address obtaining unit 21 is used to obtain the DMAC address in the Ethernet message.

The DMAC address matching unit 721 is used to match the DMAC address mapping table of the mapping relationship between the recorded DMAC address and the COS value according to the DMAC address obtained by the DMAC address obtaining unit 21, and when successfully matched, replace it with the COS value obtained by mapping For the COS value in the Ethernet message, the Ethernet message after replacing the COS value is sent to the COS value matching unit; when there is no successful match, the Ethernet message is directly sent to the COS value matching unit;

The COS value matching unit 722 is configured to map the priority of the RPR data message according to the COS value carried in the Ethernet message received from the DMAC address matching unit 721;

The encapsulation RPR data message unit 33 is used to add the priority of the RPR data message obtained by mapping the COS value matching unit 722 to the encapsulation of the Ethernet message by interacting with the COS value matching unit 722. In the service level of the basic control field of the RPR data packet.

A method for implementing message priority mapping provided by the present invention, by setting the DMAC address mapping table according to the DMAC address of the Ethernet message that needs to adjust the mapping relationship, when performing the priority mapping from the Ethernet message to the RPR data message During the mapping process, the DMAC address mapping table is matched according to its own DMAC address. When the matching is successful, it indicates that the mapping relationship between the current Ethernet message and the RPR data message needs to be adjusted. At this time, the DMAC address mapping table obtains the Ethernet The priority of the RPR data packet corresponding to the network. The invention also provides a device for realizing message priority mapping. Due to the method and device provided by the present invention, by matching the set DMAC address mapping table, the Ethernet message can be flexibly mapped to the RPR data message of appropriate priority, which adapts to the needs of the RPR ring network to carry services and ensures Improve the quality of service for users and improve service stability.

Description of drawings

Fig. 1 is the flowchart of an embodiment of the method of the present invention;

Fig. 2 is a structural diagram of an embodiment of the device of the present invention;

Fig. 3 is the flowchart of another embodiment of the device of the present invention;

Fig. 4 is the flowchart of another embodiment of the method of the present invention;

Fig. 5 is the flowchart of another embodiment of the device of the present invention;

Fig. 6 is the flowchart of another embodiment of the method of the present invention;

Fig. 7 is a flowchart of another embodiment of the device of the present invention.

Detailed ways

In the present invention, the DMAC address mapping table is set, and the network side records the DMAC address of the Ethernet message in the priority mapping relationship between the Ethernet message and the RPR data message to be adjusted in the DMAC address mapping table. Here, the adjustment of the priority mapping relationship between the Ethernet message and the RPR data message referred to is relative to the mapping relationship in the prior art. When the mapping relationship in the prior art can no longer meet the needs of the RPR ring network, then it is necessary to adjust the priority mapping relationship between the Ethernet message and the RPR data message encapsulated by itself, so as to meet the application requirements of the RPR ring network.

When an Ethernet packet is encapsulated into an RPR data packet, the DMAC address mapping table is matched according to the DMAC address of the Ethernet packet. When the match is successful, the priority mapping relationship between the current Ethernet packet and the RPR data packet needs to be At this time, the priority of the RPR data message is obtained according to the DMAC mapping table mapping; when there is no successful match, the priority mapping relationship between the current Ethernet message and the RPR data The COS value carried by the network packet itself is mapped to obtain the corresponding priority; then, the RPR data packet encapsulating the Ethernet packet is mapped to the obtained priority.

The concrete process of the inventive method is as shown in Figure 1, when Ethernet message is encapsulated to RPR data message, carry out the following steps:

Step 101: Obtain the DMAC address of the Ethernet packet, match the obtained DMAC address with the DMAC address mapping table, and judge whether the match is successful, if yes, execute step 102; otherwise, execute step 103.

Step 102: Match the DMAC address mapping table according to the obtained DMAC address to obtain the priority of the RPR data packet encapsulated into the Ethernet packet. End the current processing flow.

Step 103: Obtain the priority of the RPR data packet according to the COS value carried in the Ethernet packet.

Here, in step 103, the priority of the RPR data packet to which the Ethernet packet is encapsulated can also be obtained through mapping according to the mapping relationship between other Ethernet packets and RPR data packets in the prior art.

After the priority of the RPR data packet is obtained, the obtained priority may be further written into the service level of the basic control field of the RPR data packet encapsulating the Ethernet packet.

In the present invention, the set DMAC address mapping table may be a mapping relationship between DMAC addresses and priorities, or a mapping relationship between DMAC addresses and COS values.

When the DMAC address mapping table of the mapping relationship between the DMAC address and the priority is set, when the DMAC address mapping table is successfully matched according to the DMAC address, that is, when step 102 is performed, then the DMAC address of the Ethernet message is matched The DMAC address mapping table is mapped to obtain the priority corresponding to the DMAC address, and the currently obtained priority is the priority of the RPR data message encapsulated into the Ethernet message. Here, the DMAC address mapping table of the set mapping relationship between the DMAC address and the priority is referred to as: DMAC address to priority mapping table.

When the DMAC address mapping table of the mapping relationship between the DMAC address and the COS value is set, when the DMAC address mapping table is successfully matched according to the DMAC address, that is, when step 102 is performed, then the DMAC address of the Ethernet message is matched The DMAC address mapping table obtains the COS value corresponding to the DMAC address, replaces the COS value in the Ethernet message with the obtained COS value, and obtains the corresponding priority according to the replaced COS value mapping, then the currently obtained The priority is the priority of the RPR data packet to which the Ethernet packet is encapsulated. Here, the DMAC address mapping table for the mapping relationship between the set DMAC address and the COS value is called: DMAC address to COS value mapping table.

In the case of using a DMAC address-to-COS value mapping table, for Ethernet packets that do not carry a COS value, a fixed mapping method can be used to map to obtain a corresponding priority, or a method of adding a COS value can also be used. The way to add the COS value is to match the result of the DMAC address to COS value mapping table according to the DMAC address of the Ethernet message, add the matched COS value to the Ethernet message, and then add the COS value according to the added COS value in the Ethernet message. The value gets the corresponding priority.

FIG. 2 is a schematic structural diagram of a device for realizing packet priority mapping corresponding to the method of the present invention. As shown in FIG. 2 , the device of the present invention includes: a DMAC address obtaining unit 21 and a priority mapping unit 22 .

Wherein, the DMAC address acquiring unit 21 is configured to acquire the DMAC address in the Ethernet message.

The priority mapping unit 22 is used to match the DMAC address mapping table according to the DMAC address obtained by the DMAC address obtaining unit 21 through interaction with the DMAC address obtaining unit 21. When the match is successful, the RPR to which the Ethernet message is encapsulated is mapped. The priority of the datagram.

The interaction between the priority mapping unit 22 and the DMAC address obtaining unit 21 referred to here refers to: the priority mapping unit 22 actively obtains the DMAC address of the Ethernet message from the DMAC address obtaining unit 21, or the priority mapping unit 22 passively receives the DMAC The DMAC address of the Ethernet packet sent by the address acquisition unit 21.

The device provided by the present invention further includes: a unit 33 for encapsulating RPR data packets, the specific structure of which is shown in FIG. 3 .

Here, the encapsulating RPR data packet unit 33 is used to add the priority obtained by mapping the priority mapping unit 22 to the RPR data packet encapsulating the Ethernet packet by interacting with the priority mapping unit 22. In the service level of the basic control field.

Here, the interaction between the priority mapping unit 22 and the encapsulating RPR data message unit 33 refers to: the encapsulating RPR data message unit 33 actively obtains the priority of the current Ethernet message or the RPR data from the priority mapping unit 22 The message unit 33 passively receives the priority of the current Ethernet message sent by the priority mapping unit 22 .

Simultaneously, encapsulation RPR data message unit 33, the priority of acquisition is added to the Ethernet message in the RPR data message that encapsulates described Ethernet message, according to the different data processing procedure of RPR equipment, can be from DMAC Directly obtain in the address obtaining unit 21; It can also be that the DMAC address obtaining unit 21 transmits the Ethernet message to the priority mapping unit 22, and then the priority mapping unit 22 transmits it to the encapsulation RPR data message unit 33; it can also be It is the encapsulating RPR data message unit 33, which first receives the current Ethernet message to be encapsulated, and then sends it to the DAMC address acquisition unit 21, while encapsulating the Ethernet message can be performed according to the Ethernet message received by itself. encapsulation.

In the present invention, according to the difference of the set DMAC address mapping table, two embodiments are listed and the present invention is further described in detail with reference to the accompanying drawings.

Wherein, what embodiment one describes is: what is recorded in the DMAC address mapping table is the mapping relationship between the DMAC address and the priority; what embodiment two describes is: what is recorded in the DMAC address mapping table is the relationship between the DMAC address and the COS value mapping relationship. The two embodiments described in the present invention are both applied to RPR devices on the RPR ring network.

Embodiment one

Before performing the method described in this embodiment, it is necessary to pre-set the DMAC address of the Ethernet message to the priority mapping table, which is used to realize the priority of the Ethernet message to the priority of the RPR data message according to the DMAC address of the Ethernet message level mapping.

In the DMAC address-to-priority mapping table, each DMAC address-to-priority mapping entry includes the following three items: DMAC address, mask (MASK) and priority, as shown in Table 1. In this embodiment, the DMAC address-to-priority mapping entry may be referred to as an entry for short.

content meaning DMAC address mask priority Length (unit bit) 48 0～48 2

Table 1

Wherein, the length of the DMAC address is 48 bits; the length of the mask can be configured with any value from 0 to 48 bits according to specific needs; the length of the priority is 2 bits. Here, the length of the mask can be any value from 0 to 48 bits, but since the upper 24 bits of the DMAC address are usually fixed, a better length of the mask should be selected between 0 and 24 bits. When the length of the mask is less than 48 bits, the mask is masked from the low bit of the DMAC address. At the same time, the reason why the priority is 2 bits is that the RPR data message is only divided into four levels of priority. Of course, the length of the priority in the table entry can be extended correspondingly according to the priority level of the RPR data message in the future.

The DMAC address and mask in the DMAC address-to-priority mapping table entry are used to jointly match the DMAC address in the Ethernet packet. When the match is successful, the priority corresponding to the DMAC address of the Ethernet packet is obtained, that is, The priority of the RPR data packet to which the Ethernet packet is mapped. The specific matching method is described in detail in the execution flow of the method in this embodiment.

The process flow of the method of this embodiment is shown in Figure 4, including the following steps:

Step 401: When the RPR device receives an Ethernet packet, it needs to obtain the DMAC address carried in the currently received Ethernet packet before encapsulating the Ethernet packet with a data packet in the RPR extended frame format.

Step 402: According to the DMAC address obtained in step 401, match in the DMAC address to the priority mapping table, judge whether there is a matching DMAC address to the priority mapping table entry, if there is, then perform step 403; otherwise, perform step 404.

Here, judge whether there is an entry matching the obtained DMAC address, that is, use the obtained DMAC address to match each entry in the DMAC address to priority mapping table, and judge whether there is a table matching the DMAC address If one of the entries is successfully matched, there is a matching entry for the DMAC address; if no entry in the DMAC address-to-priority mapping table is successfully matched, then there is no matching entry for the DMAC address.

Among them, judging whether an entry can successfully match the obtained DMAC address is: using the mask in the entry to shield the DMAC address in the entry and the obtained DMAC, and judging the DMAC address in the masked entry and the obtained DMAC Whether they are the same, if they are the same, the match is successful; otherwise, there is no match. Specifically: According to the bit where the mask data 0 is located, the bit corresponding to the DMAC address in the shielded entry, and the bit corresponding to the obtained DMAC address, determine the unmasked bit of the DMAC address in the entry and the obtained DMAC Whether the data on the unmasked bits of the address are the same, if they are the same, the entry successfully matches the DMAC address; otherwise, the entry cannot successfully match the DMAC address.

Taking the mask length as 12 bits and table entry values as shown in Table 2 as an example, the method for judging whether a certain entry can successfully match the obtained DMAC address is further described below.

content meaning MAC address mask priority configuration value 0x0100.5E11.3388 0xF00 1

Table 2

0x in Table 2 represents hexadecimal, the DMAC address configured in the entry is 0x0100.5E11.3388, the mask is 0xF00, and the priority is 1. Here, the binary representation of the mask is 1111.0000.0000, which means that the acquired DMAC address and the last 8 bits of the DMAC address in the entry corresponding to the mask are shielded, and the obtained DMAC is compared with the DMAC address in the entry The upper 32 bits. When the DMAC address of the received Ethernet message is 0x0100.5E11.3344, compare whether the upper 32 bits of the DMAC address of the Ethernet message and the DMAC address in the entry are the same, because 0x0100.5E11.3344 and The upper 32 bits of 0x0100.5E11.3388 are the same, so the received Ethernet packet successfully matches the current entry, and the corresponding priority of the Ethernet packet is 1.

When the DMAC address of the received Ethernet message is 0x0100.5D11.3344, the DMAC of the Ethernet message is different from the data in the upper 32 bits of the configured MAC address, and the currently received Ethernet The network packet cannot match the current entry.

Of course, in this embodiment, the DMAC address of the received Ethernet message can also be matched without the combination of DMAC and mask, and only the DMAC address configured in the entry can be judged according to the DMAC address of the received Ethernet message. Whether the same DMAC exists in the DMAC address-to-priority mapping table, and if it exists, the match is successful; otherwise, the match is unsuccessful.

Step 403: According to the successfully matched entry, the priority of the record in the entry is obtained through mapping, and step 405 is executed.

Step 404: According to the COS value matching method in the prior art, the priority of the RPR data packet to which the currently received Ethernet packet is encapsulated is obtained through mapping.

Step 405: Add the priority obtained by the current mapping to the service level (SC) in the basic control (basecontrol) field of the RPR data message that encapsulates the currently received Ethernet message, and encapsulate the Ethernet message The RPR data packets are mapped to the priority obtained by the current mapping.

FIG. 5 is a structural diagram of a device corresponding to the method in this embodiment. As shown in FIG. 5 , it includes a DMAC address obtaining unit 21 , a priority mapping unit 52 and a unit 33 for encapsulating RPR data packets. The priority mapping unit 22 includes: a DMAC address matching unit 521 and a COS value matching unit 522 .

Wherein, the DMAC address obtaining unit 21 is used to obtain the DMAC address in the Ethernet message.

The DMAC address matching unit 521 is used to interact with the DMAC address obtaining unit 21, according to the DMAC address obtained by the DMAC address obtaining unit 21, match the DMAC address mapping table that has recorded the mapping relationship between the DMAC address and the priority, when successfully matched , then map to obtain the priority of the RPR data packet; when there is no successful match, instruct the COS value matching unit 522 to map to obtain the priority of the RPR data packet.

The COS value matching unit 522 is configured to obtain the priority of the RPR data message according to the instruction of the DMAC address matching unit 521 and according to the COS value carried in the Ethernet message.

Encapsulating the RPR data message unit 33, used for interacting with the DMAC address matching unit 521, adding the priority obtained by mapping the DMAC address matching unit 521 to the basic control of the RPR data message that encapsulates the Ethernet message field; and by interacting with the COS value matching unit 522, the priority obtained by mapping the COS value matching unit 522 is added to the service of the basic control field of the RPR data message that encapsulates the Ethernet message level.

Embodiment two

Before executing the method described in this embodiment, it is necessary to set the DMAC address of the mapping relationship between the DMAC address of the Ethernet message and the corresponding COS value according to the priority mapping relationship between the adjusted Ethernet message and the RPR data message mapping table. The specific method is: according to the priority of the RPR data message encapsulated into each Ethernet message that needs to be adjusted, obtain the COS value corresponding to the priority, and record the difference between the DMAC address of each Ethernet message and the corresponding COS value The DMAC address mapping table of the mapping relationship.

In the DMAC address-to-COS value mapping table, each DMAC address-to-COS value mapping entry includes the following three items, DMAC address, mask (MASK) and corresponding COS value, as shown in Table 3. In this embodiment, the DMAC address-to-COS value mapping entry may be referred to as an entry for short.

content meaning DMAC address mask COS value Length (unit bit) 48 0～48 3

table 3

Wherein, the length of the DMAC address is 48 bits; the length of the mask can be configured with any value from 0 to 48 bits according to specific needs; the length of the COS value is 3 bits. Here, the length of the mask can be any value from 0 to 48 bits, but since the upper 24 bits of the DMAC address are usually fixed, it is better to choose the length of the mask between 0 and 24 bits . When the length of the mask is less than 48 bits, the mask can be set to mask from the low bit of the DMAC address. At the same time, the length of the COS value is determined according to the length of the COS value carried in the Ethernet message. Of course, the length of the COS value in the entry can be extended correspondingly according to the COS value carried in the Ethernet message in the future.

The DMAC address and the mask in the DMAC address-to-COS value mapping table entry are used to jointly match the COS value, and when the match is successful, the COS value corresponding to the DMAC address of the Ethernet packet is obtained. The specific matching method is the same as the method for obtaining the priority according to the joint matching of the DMAC address and the mask in the first embodiment, except that the COS value is obtained according to the joint matching of the DMAC address and the mask in this embodiment.

The process flow of the method of this embodiment is shown in Figure 6, including the following steps:

Step 601: When an RPR network device receives an Ethernet packet, it needs to obtain the DMAC address of the currently received packet before encapsulating the Ethernet packet in a data packet in the RPR extended frame format.

Step 602: According to the DMAC address obtained in step 601, perform a match in the DMAC address to COS value mapping table, and judge whether there is a matching DMAC address to COS value mapping entry, and if so, perform step 603; otherwise, perform step 603 604.

Here, the specific method for judging whether there is a DMAC address-to-COS value mapping entry that matches the obtained DMAC address is the same as the method for judging whether there is a DMAC address-to-priority mapping entry that matches the obtained DMAC address in Embodiment 1 , which will not be described in detail here.

Step 603: Obtain the COS value recorded in the entry according to the successfully matched entry, replace the COS value carried in the currently received Ethernet message with the obtained COS value, and execute step 604.

Step 604: According to the matching of COS values in the prior art, the priority of the RPR data packet to which the current Ethernet packet is encapsulated is obtained through mapping.

Step 605: Add the priority obtained by the current mapping to the service level (SC) in the basic control (basecontrol) field of the RPR data message that encapsulates the currently received Ethernet message, and encapsulate the Ethernet message The RPR data packets are mapped to the priority obtained by the current mapping.

FIG. 7 is a structural diagram of a device corresponding to the method in this embodiment. As shown in FIG. 7 , it includes a DMAC address obtaining unit 21 , a priority mapping unit 72 and a unit 33 for encapsulating RPR data packets. The priority mapping unit 72 includes: a DMAC address matching unit 721 and a COS value matching unit 722 .

Wherein, the DMAC address obtaining unit 21 is used to obtain the DMAC address in the Ethernet message.

The DMAC address matching unit 721 is used to match the DMAC address mapping table of the mapping relationship between the recorded DMAC address and the COS value according to the DMAC address obtained by the DMAC address obtaining unit 21, and when successfully matched, replace it with the COS value obtained by mapping For the COS value in the Ethernet message, the Ethernet message after replacing the COS value is sent to the COS value matching unit; when there is no successful match, the Ethernet message is directly sent to the COS value matching unit;

The COS value matching unit 722 is configured to map the COS value carried in the Ethernet message received from the DMAC address matching unit 721 to obtain the priority of the RPR data message.

The encapsulation RPR data message unit 33 is used to add the priority of the RPR data message obtained by mapping the COS value matching unit 722 to the encapsulation of the Ethernet message by interacting with the COS value matching unit 722. In the service level of the basic control field of the RPR data packet.

The method provided by the present invention can be realized in different hardware such as FPGA, NP and CPU; the device provided by the present invention can be located in different hardware chips such as FPGA, NP and CPU.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (2)

1. a method that realizes the message priority mapping is applied to the RPR network equipment, it is characterized in that, the mapping table of purpose medium access control dmac address to the COS value is set; Carry out following steps:

Step 601: when the RPR network equipment is received the Ethernet message, need carry out obtaining the current dmac address of receiving message before the data message encapsulation of RPR Extended Superframe Format to this Ethernet message;

Step 602: according to the dmac address that obtains in the step 601, mate to COS value mapping table at dmac address, the dmac address that judges whether to have coupling is to COS value mapping item, if exist, then execution in step 603; Otherwise, execution in step 604;

Step 603: according to the list item that the match is successful, the COS value that writes down in the acquisition list item is with the COS value of carrying in the current Ethernet message of receiving of COS value replacement that obtains, execution in step 604;

Step 604: according to COS value coupling, mapping obtains the priority of the RPR data message that current Ethernet message is packaged into;

Step 605: the priority that current mapping is obtained is added in the basic controlling field that has encapsulated the current RPR data message of receiving the Ethernet message in the service class (SC), and the RPR data message that has encapsulated described Ethernet message is mapped to the priority that current mapping obtains.

2. a device of realizing the message priority mapping is characterized in that, this device comprises dmac address acquiring unit (21), priority mapping unit (72) and encapsulation RPR data message unit (33); Wherein priority mapping unit (72) comprising: dmac address matching unit (721) and COS value matching unit (722);

Wherein, dmac address acquiring unit (21) is used for obtaining the dmac address of Ethernet message;

Dmac address matching unit (721), be used for the dmac address matched record obtained according to dmac address acquiring unit (21) dmac address and the COS value between the dmac address mapping table of mapping relations, when successfully mating, then the COS value that obtains with mapping is replaced the COS value in the Ethernet message, and the Ethernet message after the replacement COS value is sent to COS value matching unit; When successfully not mating, then directly the Ethernet message is sent to COS value matching unit;

COS value matching unit (722), the COS value mapping that is used for carrying according to the Ethernet message of receiving from dmac address matching unit (721) obtains the priority of described RPR data message;

Encapsulation RPR data message unit (33), be used for mutual by with COS value matching unit (722), the priority of the described RPR data message that COS value matching unit (722) mapping is obtained is added in the service class of basic controlling field of the RPR data message that has encapsulated described Ethernet message.

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