CN100370778C - Resilient packet ring business transport method - Google Patents
Resilient packet ring business transport method Download PDFInfo
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- CN100370778C CN100370778C CNB2004100570779A CN200410057077A CN100370778C CN 100370778 C CN100370778 C CN 100370778C CN B2004100570779 A CNB2004100570779 A CN B2004100570779A CN 200410057077 A CN200410057077 A CN 200410057077A CN 100370778 C CN100370778 C CN 100370778C
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Abstract
The present invention discloses a method for transmitting services by a resilient packet ring network, which comprises the steps that an extension field of a payload frame header of a universal framing protocol is used for carrying the information of a frame header of a resilient packet ring; a management frame of the resilient packet ring network is set according to a frame format of a universal frame processing protocol; the resilient packet ring network is managed for transmitting the services by the management frame of the resilient packet ring network. The present invention can be used for increasing the user service data encapsulation efficiency and the bandwidth utilization rate of a physical layer, simplifying system design, and reducing the cost.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of method of RPR network transport service.
Background technology
At present, along with Internet development, data traffic is being explosive growth, for the development that plays the metropolitan area network of link effect between enterprise network and wide area network provides new demand.Stretch grouped data ring RPR technology is new network architecture and the technology that designs based on the requirement of grouping metropolitan area network in order to satisfy; Be a kind of loop network of forming by Packet Switch Node, its topological structure as shown in Figure 1, adjacent node connects by a pair of optical fiber; Its network topology is based on the ring of two rightabout transmission.
RPR (Resilient Packet Ring) technology is a kind of MAC (medium access control layer) layer protocol that data service transmits of optimizing on loop configuration, can adapt to multiple physical layer, as SDH (synchronous transmission system), Ethernet, DWDM (dense wave division multipurpose), can transmit the data of multiple business types such as speech, image effectively.It has merged the characteristics such as economy, flexibility, extensibility of ethernet technology; the 50ms that has absorbed the SDH looped network simultaneously is the advantage of protection fast, and have that network topology is found automatically, loop bandwidth is shared, fair allocat, strict COS functions such as (professional classification).
In SDH/SONET of new generation (SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network) product, RPR looped network technology is embedded in the SDH equipment, adopt the mode networking of RPR over SDH (SDH carries RPR), can make full use of the resource of existing transmission network, and strengthen the bearing capacity of transmission network the data business.RPR over SDH makes operator that at a high speed data service both can be provided, and has also kept the support to traditional speech business based on circuit.RPR over SDH adopts hierarchical structure shown in Figure 2, correspondingly, user's business packet handling process as shown in Figure 3:
Step1: client's packet;
Step2: the protocol processes that RPR Head is convenient to carry out the RPR layer is gone up in client's packet interpolation, regard payload as at RPR, form the frame format of RPR for user's data.
Step3: the bag that has encapsulated the RPR data head encapsulates GFP Head again, forms the frame of GFP, and is mapped in the SDH frame format;
Step4:SDH transmits in optical fiber or copper cable.
Gfp frame form after the encapsulation comprises: the core head in the gfp frame head, payload frame head, the GFP payload section comprises: PRP frame head, user's payload data, FCS (frame check Frame check sequence).
By this figure as can be seen, the user's data bag need add the RPR head and the GFP head encapsulates, and then, is transmitted by physical medium again.Can reduce transmission efficiency through two-layer encapsulation like this; Relate to the processing of multilayer simultaneously, comprise the encapsulation and the extraction of different agreement, cause complex structural designs, product development cost rises.
In order to guarantee the normal transmission of customer service on the RPR looped network, also need to transmit various signaling messages between each node.In the prior art, RPR protocol layer and GFP protocol layer are independent process separately, are to handle by different modules respectively in design, each other without any relation, make the system design complexity like this, transmit and treatment effeciency relatively low.
Summary of the invention
The method that the purpose of this invention is to provide a kind of Resilient Packet Ring network transmission, the RPR looped network transmits the problem that the signaling method processing is complicated, transmission efficiency is lower at operation layer in the prior art to solve, the design of simplification product in reliable transmission of assurance RPR signaling security.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method of RPR network transport service comprises:
A, utilize generic framing procedure, GFP payload frame head extended field to carry described Resilient Packet Ring frame head information;
B, utilize that to select a value defined arbitrarily in the territory reservation situation of generic framing procedure, GFP frame be described RPR network management frames;
C, manage described RPR network transport service by described RPR network management frames.
Described RPR network management frames comprises: management control frame, fairness frame, idle frame.
Described territory is PTI territory or UPI territory.
Described step C comprises:
C1, utilize described generic framing procedure, GFP to encapsulate described business datum;
C2, insert described RPR network management frames by predetermined way;
C3, transmit the information of the online different nodes of described Resilient Packet Ring by described RPR network management frames.
Described predetermined way is specially:
Insert described RPR network management frames when regularly inserting described RPR network management frames or needing to detect described different node state.
Described step C3 comprises:
Transmit the state and the control information of described different nodes by described management control frame;
Transmit the internodal flow information of described difference by described fairness frame;
Adjust the internodal transmission rate of described difference by described idle frame.
By above technical scheme provided by the invention as can be seen, the present invention realizes the transmission of signaling protocol by the GFP encapsulated layer in the RPR looped network, the PRR head is encapsulated in the net load frame head extended field zone of GFP, made full use of the expansion area of GFP, improved packaging efficiency, simplified the multilayer complex process that encapsulation process and signaling transmit, reduced, made the transmission of signaling simple, reliable the taking of physical layer bandwidth; Because the minimizing of encapsulation level has reduced the system design complexity, and then can reduce equipment cost.The present invention also utilizes the GFP transmission channels of formation to realize the RPR looped network protection.
Description of drawings
Fig. 1 is a RPR ring network structure schematic diagram;
Fig. 2 is the network layer figure of prior art SDH/SONET carrying RPR;
Fig. 3 is a prior art RPR over SDH/SONET customer service bag process chart;
Fig. 4 is the frame structure schematic diagram of GFP;
Fig. 5 is a GFP net load header structure schematic diagram;
Fig. 6 is the encapsulation format when utilizing the GFP extension header to transmit the signaling of upper-layer service or agreement in the inventive method;
Fig. 7 is to the gfp frame form after user service data encapsulation process and the encapsulation in the inventive method;
Fig. 8 is GFP client's frame format;
Fig. 9 is the encapsulation format when utilizing GFP customer account management frame to transmit the signaling of upper-layer service or agreement in the inventive method;
Figure 10 is the encapsulation format when utilizing the new type frame of definition to transmit the signaling of upper-layer service or agreement in the inventive method;
Figure 11 is the flow chart of the inventive method;
Figure 12 realizes 1:1 protection schematic diagram by inserting the management control frame in the inventive method.
Embodiment
Core of the present invention is to utilize GPF (generic framing procedure, GFP) layer carrier signaling agreement in the RPR looped network, and the PRR head is encapsulated in the payload frame head extended area of GFP, realize the transmission of each internodal signaling and business datum by the passage of GFP encapsulated layer formation.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
At first the gfp frame structure of using among the present invention is done a simple declaration:
The gfp frame form is specific definition in standard G.7041, and the frame structure of GFP comprises gfp frame head (Core Header) and GFP net load district (GFP Payload Area) two parts as shown in Figure 4.Wherein, the gfp frame head comprises: (PLI) and the frame head error checking (Core HEC) of frame length sign.PLI is 2 bytes, indicates the length of the net load of frame, and the frame head error checking also is 2 bytes, and it adopts the error-detecting method of CRC-16 to provide protection to frame head; GFP net load district comprises: frame check sequence (Payload FCS) three parts of net load head (Payload Header), net load information field (Payload Information) and net load.
The present invention utilizes the GFP layer to realize the encapsulation of upper-layer user's signaling and agreement promptly according to above GFP protocol definition, specifically comprises:
(1) utilize the expansion section of gfp frame to carry the RPR encapsulation header
GFP net load head (Payload Header) structure comprises as shown in Figure 5: the type field verification (Type HEC) of the type field of 2 bytes (Payload Type), 2 bytes, the extension header information field of 0～60 byte (the extension header verification territory that comprises 2 bytes).
As seen, can utilize the extension header in the net load head to carry the RPR head, RPR frame head information is directly inserted the encapsulation that the RPR layer is realized in this zone, and this head includes but not limited to following information: information such as source node address, destination node address, RPR inner and outer ring sign, TTL (Time to live), control information, protocol type.Certainly, also can utilize extension header in the net load head to transmit the signaling or the agreement of upper-layer service, user's information is directly inserted the transmission that information protocol is finished in this zone, the signaling encapsulation format as shown in Figure 6.
For the user service data encapsulation, RPR encapsulation of the prior art and GFP encapsulation process are merged, compared with prior art, simplified encapsulation process, improved protocol encapsulation efficient.Gfp frame form after the encapsulation process of user service data and the encapsulation as shown in Figure 7.
Step1: client's packet;
Step2: client's data envelope is installed to the GFP head, in the gfp frame head, carried the RPR agreement, form gfp frame, and be mapped in the SDH frame format;
Step3:SDH transmits in optical fiber or copper cable.
Gfp frame form after the encapsulation comprises: gfp frame head, payload frame head, and the payload that comprises the RPR frame head is expanded frame head, and the GFP payload section comprises: user's payload data also comprises Frame Check Sequence FCS in addition.
(2) utilize GFP customer account management frame definition RPR looped network management frames
Frame according to the GFP formal definition is divided into two classes:
A, GFP client's frame: finish the encapsulation of client's side information, comprise client data frame (encapsulation customer data information) and customer account management frame (encapsulating some clients' management information);
B, GFP control frame: definition GFP connection management, present Idle (free time) frame that only defines GFP.
According to the GFP protocol definition, in the PLI domain representation payload length indication of GFP core frame head.When PLI=0～3, be expressed as the GFP control frame, definition GFP connection management.When only defining PLI=0 according to present agreement control frame is GFP Idle frame, is used for the rate adapted of data map process.PLI=1～3 are the reservation situation, and are undefined at present.When PLI=4～65535, be expressed as GFP client's frame, as shown in Figure 8, finish the encapsulation of client's side information, comprise client data frame (encapsulation customer data information) and customer account management frame (encapsulating some clients' management information frame).
PTI (Payload type Identifier, payload type indication) is used to refer to the user data type that transmits in the GFP encapsulation, is defined as follows shown in the table 1 in G.7041 at ITU-t at present:
Table 1:
| Payload type indication PTI type bit position＜15:13 〉 | |
| 000 | Client Data (customer data) |
| 100 | ClientManagement (customer account management frame) |
| Others | Reserved (reservation) |
As frame type sign PTI=100, expression customer account management frame, be used for client-side management information and transmit, only defining two kinds of UPI=00000001 in UPI (User payload Identifier, user's payload sign) territory at present is that client signal is lost (Loss of Client Signal); UPI=00000010 is character synchronization loss (Loss of Character Synchronization); UPI=00000000,00000011～11111111 undefined.
As seen, can utilize UPI=00000000,00000011～11111111 o'clock undefined customer account management frame to transmit the signaling or the agreement of upper-layer service, user's information is directly inserted the transmission that information protocol is finished in this zone, and the signaling encapsulation format as shown in Figure 9.
For example, distinguishing by the value of definition UPI is management control frame, fairness frame, the idle frame of RPR agreement:
During UPI=00000011, be defined as RPR management control frame;
During UPI=00000100, be defined as the RPR fairness frame;
Like this, can extract management frames apace by hardware logic and carry out follow-up respective handling, thereby can improve treatment effeciency.
(3) utilize new type frame definition RPR looped network management frames
By table 1 as seen, PTI=000, PTI=100 is used for defining client data frame and customer account management frame respectively, and pti field contains 3 bit, can represent 8 types frame at most, therefore current untapped type PTI=001～011 and PTI=101～111 can be used to definition and transmit signaling, and the signaling encapsulation format as shown in figure 10.
For example, distinguish traffic frame or management control frame by defining different PTI values:
During PTI=001, be defined as the management control frame;
During UPI=101, be defined as fairness frame;
Like this, can rapid extraction go out management frames by hardware logic and carry out follow-up respective handling,, thus treatment effeciency can be improved.
Define by above three kinds of modes and to make the GPF frame transmit user's different signalings, specifically can select for use respectively according to actual conditions.
Figure 11 is the flow chart of the inventive method, may further comprise the steps:
Step S1: utilize GFP agreement net load frame header fields carrying RPR frame head information;
Step S2:, comprising: management control frame, fairness frame, idle frame according to gfp frame format setting RPR management frames.Concrete definition mode is as follows:
Utilizing and selecting a value defined arbitrarily in the reservation situation of user's payload sign UPI of generic framing procedure, GFP customer account management frame is described RPR network management frames; Perhaps
Utilizing and selecting a value defined arbitrarily in the reservation situation of payload type indication PTI of generic framing procedure, GFP frame is described RPR network management frames.
Above-mentioned two kinds of definition mode fronts are elaborated, do not repeat them here.
Step S3: utilize GFP protocol encapsulation business datum.In this protocol encapsulation process, the RPR agreement is inserted in the GFP agreement net load frame header fields, once finish the encapsulation of GFP agreement and RPR agreement.
Step S4: press predetermined way and insert the RPR management frames.Can be according to actual needs, insert the RPR management frames when regularly inserting the RPR management frames or needing to detect on the RPR looped network different node state.By the management of these management frames realizations to the RPR looped network.
Step S5: the information by different nodes on the RPR management frames transmission RPR looped network, realize the management to customer service and RPR looped network.
For example:
Transmit the state and the control information of described different nodes by described management control frame;
Transmit the internodal flow information of described difference by described fairness frame;
Adjust the internodal transmission rate of described difference by described idle frame.
As long as two protocol channels between network element can be provided, make the blockage information that to utilize between different network elements between this channel service flow information, network topological information, each website etc., each node is handled to upper layer software (applications) by the hardware extraction message like this, so just can realize the management to the RPR looped network.
Figure 12 shows in the inventive method and by management frames the RPR looped network is realized the flow process that 1:1 protects, and promptly the signalling path by GFP transmits two links between network elements states between two network elements, realizes professional selection.Implementation procedure is as follows:
1, node A carries out two sending out with business, transmits identical services simultaneously at operating path and protection path;
2, destination node B carries out professional choosing receipts, selects the good end of signal;
3, for making things convenient for B point to carry out the judgement of business, at the regular transmit status confirmation message of A point.
For example, during PTI=010, be defined as 1:1 management control frame;
Between the A of Figure 12, B two nodes, can carry out the transmission of link-state information between two nodes like this by the management control frame of PTI=010; hardware logic can be by the frame of identification PTI=010; rapid extraction goes out to manage control frame and offers the migration that software carries out protocol state machine, thereby has realized the 1:1 protection based on package level.
Concrete business realizing process is as follows:
1, the A node only sends to the B node by operating path with business datum;
2, in order to guarantee that the B node can monitor the operating path quality in real time, the A node regularly sends the management control frame of PTI=010 to the B node from operating path;
3, in order to guarantee B node monitoring and protection path quality in real time, the A node regularly sends the management control frame of PTI=010 to the B node from the protection path;
4, the B node is monitored the management control frame of operating path and the protection PTI=010 that receives of path respectively, if can regularly receive then illustrate that Link State is normal.
If 5 A break down (as fiber failure) to the operating path of B, the B node can't receive regular management control frame at operating path, can trigger the service path that upper layer software (applications) is consulted A and B node again like this;
6, the A node sent to B with business from the protection path after A and B node were consulted to finish, and the B node can normally receive business on the protection path, thereby has realized service protection.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (6)
1. the method for a RPR network transport service is characterized in that, comprising:
A, utilize generic framing procedure, GFP payload frame head extended field to carry described Resilient Packet Ring frame head information;
B, utilize that to select a value defined arbitrarily in the territory reservation situation of generic framing procedure, GFP frame be described RPR network management frames;
C, manage described RPR network transport service by described RPR network management frames.
2. the method for RPR network transport service according to claim 1 is characterized in that, described RPR network management frames comprises: management control frame, fairness frame, idle frame.
3. the method for RPR network transport service according to claim 1 and 2 is characterized in that, described territory is PTI territory or UPI territory.
4. the method for RPR network transport service according to claim 2 is characterized in that, described step C comprises:
C1, utilize described generic framing procedure, GFP to encapsulate described business datum;
C2, insert described RPR network management frames by predetermined way;
C3, transmit the information of the online different nodes of described Resilient Packet Ring by described RPR network management frames.
5. the method for RPR network transport service according to claim 4 is characterized in that, described predetermined way is specially:
Insert described RPR network management frames when regularly inserting described RPR network management frames or needing to detect described different node state.
6. the method for RPR network transport service according to claim 4 is characterized in that, described step C3 comprises:
Transmit the state and the control information of described different nodes by described management control frame;
Transmit the internodal flow information of described difference by described fairness frame;
Adjust the internodal transmission rate of described difference by described idle frame.
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| CNB2004100570779A CN100370778C (en) | 2004-08-30 | 2004-08-30 | Resilient packet ring business transport method |
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| CNB2004100570779A CN100370778C (en) | 2004-08-30 | 2004-08-30 | Resilient packet ring business transport method |
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| CN100370778C true CN100370778C (en) | 2008-02-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102546104B (en) * | 2011-12-28 | 2015-05-27 | 武汉烽火网络有限责任公司 | Method utilizing generic framing procedure to transmit network management information |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030118022A1 (en) * | 2001-12-21 | 2003-06-26 | Chip Engines | Reconfigurable data packet header processor |
| CN1490987A (en) * | 2002-10-18 | 2004-04-21 | ��Ϊ��������˾ | Method for transmitting digital business on synchronous digital network |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030118022A1 (en) * | 2001-12-21 | 2003-06-26 | Chip Engines | Reconfigurable data packet header processor |
| CN1490987A (en) * | 2002-10-18 | 2004-04-21 | ��Ϊ��������˾ | Method for transmitting digital business on synchronous digital network |
Non-Patent Citations (2)
| Title |
|---|
| 通用成帧协议(GFP)的结构及特点. 沈瑞琴.江苏通信技术，第19卷第6期. 2003 * |
| 通用成帧规程GFP协议结构特点及其关键技术. 孙嵘.光通信技术，第3期. 2003 * |
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