CN102035722B - Flow control method and device - Google Patents
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- CN102035722B CN102035722B CN200910178831.7A CN200910178831A CN102035722B CN 102035722 B CN102035722 B CN 102035722B CN 200910178831 A CN200910178831 A CN 200910178831A CN 102035722 B CN102035722 B CN 102035722B
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Abstract
The invention discloses a flow control method and a flow control device. The flow control method comprises the following steps that: local terminal equipment receives a control type length value (TLV) field of first symmetric parameter passing from opposite terminal equipment, wherein the default priority of a corresponding port of the opposite terminal equipment is carried in the control TLV field of the first symmetric parameter passing; and the local terminal equipment acquires the default priority from the control TLV field of the first symmetric parameter passing and maps the priority of untagged messages to be sent as the default priority. By the flow control method, the untagged messages can be subjected to priority-based flow control (PFC) operation in data communication equipment (DCE), so that the PFC technology has higher practicability in a network.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of flow control methods and device.
Background technology
Along with data center's (Data Centers) expansion of scale and the increase of complexity of establishing network, the flow producing from multiple different business application makes administrative skill become more complicated, cost is higher, recently, the new development of Ethernet speed (, 10Gbps has been ripe standard and has been widely used, 40/100Gbps is still under development, official standard plan will be released in 2010), make Ethernet become the most attractive technology in data center of future generation storage and data transferring technique fusion.
Data center's Ethernet (Data Center Ethernet, referred to as DCE), is the enhancing to current ethernet technology standard high-performance aspect, simultaneously for data center of future generation provides the network architecture.Yet current Ethernet itself does not have because providing storage and high-performance calculation traffic service to be optimized, and, when appearance is congested, also may there is packet loss phenomenon.So Ethernet needs a kind of low time delay with congestion management and flow control function, " can't harm " transmission technology.Therefore, DCE aspect network configuration extensibility, operability and transmission flexibility to having done emphasis expansion with large net, target is to realize stable, harmless (Lossless) transportation level.
In order to meet above-mentioned requirements, the technical characterstic that some are new, for example, the mapping from optical-fibre channel to Ethernet, " can't harm " Ethernet, redundant path and failover etc., must improve and promote, to meet the needs of data center's technology such as FCoE.Institute of Electrical and Electric Engineers (Institute for Electrical and Electronic Engineers, referred to as IEEE) DCB working group defined 3 kinds of standard: 802.1Qau for congestion notification, 802.1Qaz is used for strengthening transmission and selects, and 802.1Qbb controls for priority class traffic.These standards are intended to merge unified network for data center provides.At present, 802.1Qbb standard is also in draft writing phase, and expectation will be issued the end of the year in 2010.This standard criterion be flow control (Priority-based Flow Control, referred to as the PFC) technology based on priority.The mode that PFC provides a kind of allows the flow of low priority suspend, the data of high priority are first passed through,, the similar mechanism of time-out (PAUSE) of utilizing 802.3X, operates according to single different priority, by PAUSE function in each priority service.Fig. 1 is according to the schematic diagram of the PFC of correlation technique, as shown in Figure 1, for each priority query, if surpassed the size of its flow setting, to transmit leg, sends out PAUSE instruction.Transmit leg, after receiving PAUSE instruction corresponding to certain priority, stops sending service traffics corresponding to this priority.By PFC technology, the business of each grade of service is had and be tending towards not packet loss performance.Here, the judgement of priority is according to a kind of method that message is divided into 8 grades in 802.1p standard, and according to 802.1Q standard, priority is placed on to VLAN (the Virtual Local AreaNetwork of message, referred to as VLAN) on priority code-point (Priority CodePoint, referred to as the PCP) position of label (tag).Therefore,, for the message with tag, can obtain from tag the priority of this message, and enter queue according to priority.If queue corresponding to this priority surpasses the size of setting, send the PAUSE instruction of this priority, inform that transmit leg stops sending the message of this priority.
But, in Ethernet, also exist be not much with tag (that is, and message untag), for example, some BPDUs on network (Bridge Protocol Data Unit, referred to as BPDU), user's message etc.Due to this untag message in when transmission without VLAN tag, in Ethernet, can not carry precedence information, therefore, to this class flow, just cannot carry out flow control by PFC technology.At present, flow control in Ethernet can have two kinds of selections: a kind of port that is requirement has enabled PFC must send the message with tag, for the remote station that can not identify VLAN, this method requires to revise network protocol stack and makes these remote stations can identify VLAN tag; Another kind method is for the bridge and the website that send untag message, on untag message, add priority-tagging (vlan=0), with priority-tagging, carry the priority of this message, but, this method need to be revised 802.1Q standard, that is, revise untag message and carry priority-tagging.This two schemes all needs other technologies or standard beyond PFC technology to modify, and the scope that relates to modification is larger, is difficult to realize.
Summary of the invention
For DCE in correlation technique to untag message carry out scope that PFC relates to modification compared with large, be difficult to the problem realizing and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of flow control plan, one of to address the above problem at least.
To achieve these goals, according to an aspect of the present invention, provide a kind of flow control methods.
According to the method for flow control of the present invention, comprise: local device receives the control type lengths values TLV field that transmits Symmetric Parameter Passing from first symmetric parameter of opposite equip., wherein, in the control TLV field that first symmetric parameter transmits, carry the default priority of corresponding opposite equip. port; The control TLV field that local device transmits from first symmetric parameter, obtain default priority, and be default priority by the priority mapping of not tape label message to be sent.
Preferably, local device is that default priority comprises by the priority mapping of tape label message not: local device judges whether default priority is the priority that this locality enables the flow control PFC based on priority, and judgment result is that be in the situation that, by the priority mapping of tape label message not, be default priority.
Preferably, at local device judgement default priority, be that after this locality enables the priority of PFC, method also comprises: local device is default priority by take the message priority-level mapping of the message that form of tape label message sends.
Preferably, local device is that default priority comprises by the message priority-level mapping of message: local device judges whether the message priority of message is the priority that this locality enables PFC, and judgment result is that be in the situation that, by the message priority-level mapping of message, be default priority.
Preferably, after local device receives the control TLV field of first symmetric parameter transmission, whether not w position in the control TLV field that local device transmits according to first symmetric parameter judges opposite equip. support parameter negotiation, and judgment result is that be and local device support parameter consults in the situation that local PFC to be enabled to parameter and be arranged to the PFC of opposite equip. and enable parameter.
Preferably, after local device receives the control TLV field of first symmetric parameter transmission, opposite equip. receives the control TLV field from second symmetric parameter transmission of local device, w position in the control TLV field transmitting according to second symmetric parameter judges whether local device is that support parameter is not consulted, and judgment result is that be and opposite equip. support parameter consults in the situation that the PFC of opposite equip. to be enabled to parameter and be arranged to the PFC of local terminal equipment and enable parameter.
To achieve these goals, according to a further aspect in the invention, provide a kind of volume control device.
Volume control device according to the present invention comprises: receiver module, for receiving the control TLV field from first symmetric parameter transmission of opposite equip., wherein, in the control TLV field that first symmetric parameter transmits, carry the default priority of corresponding opposite equip. port; Acquisition module, obtains default priority for the control TLV field transmitting from first symmetric parameter; Mapping block, for being default priority by the priority mapping of not tape label message to be sent.
Preferably, mapping block comprises: judgement submodule, for judging whether default priority is the priority that this locality enables PFC; The first mapping submodule, in the situation that judgment result is that of submodule of judgement is to be default priority by the priority mapping of tape label message not.
Preferably, mapping block also comprises: the second mapping submodule, and in the situation that judgment result is that of submodule of judgement is to be default priority by take the message priority-level mapping of the message that the form of tape label message sends.
Preferably, the second mapping submodule comprises: judging unit, for judging whether the message priority of message is the priority that this locality enables PFC; Map unit, for judgment result is that be in the situation that, is default priority by the message priority-level mapping of message.
By the present invention, in the control type lengths values TLV field that employing transmits at symmetric parameter, carry the default priority of port, the mode of the default priority that is port by the priority mapping of untag message, solved in correlation technique to untag message carry out PFC relate to the scope of modification large, be difficult to the problem that realizes, and then reached in DCE the message of tape label is not carried out to PFC operation, make PFC technology in network, have the effect of better practicality.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the schematic diagram of the PFC of correlation technique;
Fig. 2 is according to the schematic diagram of the control TLV of the PFC of the embodiment of the present invention;
Fig. 3 is according to the flow chart of the flow control methods of the embodiment of the present invention;
Fig. 4 controls the schematic diagram of TLV according to the improved PFC of the embodiment of the present invention;
Fig. 5 is the schematic diagram connecting according to the port of the embodiment of the present invention;
Fig. 6 is according to the schematic diagram of the parameter negotiation of the embodiment of the present invention;
Fig. 7 is according to the flow chart of the transmission message of the embodiment of the present invention;
Fig. 8 is according to the structured flowchart of the volume control device of the embodiment of the present invention;
Fig. 9 is the concrete structured flowchart according to the volume control device of the embodiment of the present invention.
Embodiment
Functional overview
Consider DCE in correlation technique to untag message carry out PFC relate to the scope of modification large, be difficult to the problem that realizes, the invention provides a kind of scheme of flow control, the treatment principle of this scheme is as follows: local device receives control type lengths values (the TypeLength Value that transmits (Symmetric Parameter Passing) from first symmetric parameter of opposite equip., referred to as TLV) field, wherein, in the control TLV field of first Symmetric ParameterPassing, carry the default priority of corresponding opposite equip. port; Local device obtains default priority from the control TLV field of first Symmetric Parameter Passing, and is default priority by the priority mapping of untag message to be sent.By the present invention, without other technologies or standard are modified, in DCE, can carry out PFC operation to the message of tape label not, make PFC technology in network, there is better practicality.
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
In following examples, in the step shown in the flow chart of accompanying drawing, can in the computer system such as one group of computer executable instructions, carry out, and, although there is shown logical order in flow process, but in some cases, can carry out shown or described step with the order being different from herein.
Embodiment of the method
By Symmetric Parameter Passing, realize a port and pass a parameter to the port of opposite end, consistent to guarantee the parameter of two ports.Symmetric Parameter Passing utilizes a TLV to carry the state information of current this locality, Fig. 2 is according to the schematic diagram of the control TLV of the PFC of the embodiment of the present invention, as shown in Figure 2, control TLV with one " w " position, this position is 1 expression port " willing ".0 (one " willing " is if the TLV that port receives " w " position is, represent opposite end unwilling), the relevant parameter that the TLV that needs that it(?) self can operating parameter to be set to receive comprises, by the method for this parameter negotiation, can be so that two ends parameter have reached consistent.In this TLV, what PFC Enable field was carried is the state of the port, this field has a byte, totally 8, corresponding respectively 8 priority are in the situation that whether enables PFC of the port, for example, if PFCEnable=00110010, represent that priority 5,4,1 has enabled PFC at the port, the flow that is 5,4,1 to priority is controlled.
According to embodiments of the invention, provide a kind of flow control methods.
Fig. 3 is according to the flow chart of the flow control methods of the embodiment of the present invention, and as shown in Figure 3, the method comprises that following step S302 is to step S304:
Step S302, local device receives the control TLV field from first SymmetricParameter Passing of opposite equip., wherein, the default priority of the opposite equip. port carrying in the control TLV field of first SymmetricParameter Passing, thereby allow local device when carrying out parameter negotiation, obtain the default priority of Peer-Port, Fig. 4 controls the schematic diagram of TLV according to the improved PFC of the embodiment of the present invention, as shown in Figure 4, in Symmetric Parameter Passing, carry the default priority of port, TLV form after improvement utilizes 3 default port prioritys that carry the port in 4 of Reserved in former control TLV field,
Step S304, local device obtains default priority from the control TLV field of first Symmetric Parameter Passing, and is default priority by the priority mapping of untag message to be sent.
In step S304, whether the default priority that local device judgement is obtained is the priority that this locality enables the flow control PFC based on priority, if judgment result is that, be, for untag message to be sent, the default priority that was Peer-Port by the priority mapping of the frame of untag message before entering queue, and then by entering normally queue flow process, untag message is entered to queue.
Wherein, local device and opposite equip. are same equipment.At local device judgement default priority, be after this locality enables the priority of PFC, local device judge that message, whether with the form transmission of untag message, if so, is default priority by this message priority-level mapping with message.
In the situation that local device sends message with the form of untag message, local device judges whether the priority of this message is the priority that this locality enables PFC, and judgment result is that be in the situation that, by the message priority-level mapping of this message, is default priority.
After step S302, local device and opposite equip. carry out parameter negotiation, and parameter negotiation carries out in the following manner.
Mode one, local device judges according to the w position in the control TLV field of first Symmetric Parameter Passing whether opposite equip. is that support parameter is not consulted, and judgment result is that be and local device support parameter consults in the situation that local PFC to be enabled to parameter and be arranged to the PFC of opposite equip. and enable parameter.
Mode two, opposite equip. receives the control TLV field from second SymmetricParameter Passing of local device, according to the w position in the control TLV field of second Symmetric ParameterPassing, judge whether local device is that support parameter is not consulted, and judgment result is that be and opposite equip. support parameter consults in the situation that the PFC of opposite equip. to be enabled to parameter and be arranged to the PFC of local terminal equipment and enable parameter.
Below in conjunction with example, the implementation procedure of the embodiment of the present invention is described in detail.
Fig. 5 is the schematic diagram connecting according to the port of the embodiment of the present invention, as shown in Figure 5, and two connected bridge A and bridge B in DCE: the port 2/1 of port one/1 of bridge A and bridge B is connected.The default priority of the port 2/1 of bridge B is 3, and on this port, priority 3 has enabled PFC.After establishing network, between bridge A and bridge B, can initiate to carry out parameter negotiation with the Symmetric Parameter Passing of PFC control TLV field, Fig. 6 is according to the schematic diagram of the parameter negotiation of the embodiment of the present invention, as shown in Figure 5, bridge B issues in the message of bridge A with information: bridge B is willing, that is, bridge B can consultation parameter; The default port priority of the port 2/1 that bridge B is connected with bridge A is 3, and the priority situation of enabling of this port is 00011111, that is, priority 0,1,2,3,4 enables PFC.Bridge A is unwilling, that is, bridge A is consultation parameter not, and the default port priority of port one/1 that bridge A is connected with bridge B is 2, and the priority situation of enabling of this port is 00101111, that is, priority 0,1,2,3,5 has enabled PFC.Bridge A has obtained the be connected default port priority of port of opposite end with bridge B, because bridge B receives from w=0 in the Symmetric Parameter Passing parameter of bridge A, and w=1 in the Symmetric Parameter Passing parameter of bridge B self, so bridge B is revised as consistent with bridge A by the PFC situation of enabling of self, thereby, adjacent two bridges reach the consistent of PFC parameter, for realizing flow control, prepare.
Fig. 7 is according to the flow chart of the transmission message of the embodiment of the present invention, as shown in Figure 7, when bridge A has message need to mail to bridge B, need to carry out following steps S701 to step S705:
Step S701, bridge A judges whether the default priority of the port of opposite end bridge B is the priority that local terminal has enabled PFC.If judgment result is that to be, enter step S702; Otherwise, enter step S704.For example, port 2/1 default port priority of bridge B is 3, and priority 3 is the priority that has enabled PFC on bridge A, therefore, need to enter step S702 and do further judgement.
Step S702: whether bridge A judgement prepares can to send with the form of untag message into the tag message of queue, and the priority that judges this tag message priority of PFC that whether has been this devices enable.If above-mentioned judgement is, be to enter step S703; Otherwise, enter step S704.
Step S703: bridge A carries out priority mapping to the message of the row of preparing to join the team is Peer-Port default priority by all priority mapping of take the message that untag message form sends.For example, the untag message that bridge A need to send from port one/1 is mapped as priority 3, then, according to this priority, this message is put into the corresponding queue of priority 3, enters step S705.
Step S704: for the message with tag, obtain the priority of message from VLAN tag, then, this message enters in corresponding queue according to this priority, enters step S705.
Step S705: send the message in different queue according to certain selection transmission mechanism.
By above-mentioned steps, when untag message is dealt into bridge B from bridge A, because the default port priority of the port 2/1 of bridge B is 3, so this untag message also can enter in the corresponding queue of priority 3 at bridge B.Once the corresponding queue of the priority 3 of bridge B reaches certain limit, bridge B will send PFC PAUSE instruction, and the data that notice bridge A suspends in the corresponding queue of priority 3 send, thereby reach the control to untag message flow.
Device embodiment
According to embodiments of the invention, provide a kind of volume control device.
Fig. 8 is according to the structured flowchart of the volume control device of the embodiment of the present invention, and as shown in Figure 8, this device comprises: receiver module 82, acquisition module 84, mapping block 86, be described in detail this device below.
Receiver module 82, for first SymmetricParameter Passing receiving from opposite equip., control TLV field, wherein, first Symmetric ParameterPassing controls the default priority that carries corresponding opposite equip. port in TLV field; Acquisition module 84 is connected to receiver module 82, for controlling TLV field from first Symmetric ParameterPassing, obtains default priority; Mapping block 86 is connected to acquisition module 84, for being default priority by the priority mapping of untag message to be sent.
Fig. 9 is the concrete structured flowchart according to the volume control device of the embodiment of the present invention, and as shown in Figure 9, mapping block 86 comprises: judgement submodule 90, the first mapping submodule 92, be elaborated to this structure below.
Judgement submodule 90, for judging whether default priority is the priority that this locality enables PFC; The first mapping submodule 92 be connected to judgement submodule 90, in the situation that judgement judgment result is that of submodule 90 be to be default priority by the priority mapping of this untag message.
Mapping block 86 also comprises: the second mapping submodule 94, the second mapping submodule 94 is connected to judgement submodule 90, for in the situation that judgment result is that of submodule 90 of judgement is to be default priority by take the message priority-level mapping of the message that the form of untag message sends.
The second mapping submodule 94 specifically comprises: judging unit 96, map unit 98, be elaborated to this structure below.
Judging unit 96, for judging whether the message priority of this message is the priority that this locality enables PFC; Map unit 98 is connected to judging unit 96, for judgment result is that be in the situation that, by the message priority-level mapping of this message, is default priority.
In sum, by the present invention, in DCE, can carry out PFC operation to untag message, make PFC technology in network, have the effect of better practicality.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a flow control methods, is characterized in that, comprising:
Local device receives the control type lengths values TLV field that transmits Symmetric Parameter Passing from first symmetric parameter of opposite equip., wherein, in the control TLV field that described first symmetric parameter transmits, carry the default priority of corresponding opposite equip. port;
The control TLV field that described local device transmits from described first symmetric parameter, obtain described default priority, and be described default priority by the priority mapping of not tape label message to be sent.
2. method according to claim 1, is characterized in that, described local device is that described default priority comprises by the priority mapping of described not tape label message:
Described local device judges whether described default priority is the priority that this locality enables the flow control PFC based on priority, and judgment result is that be in the situation that, by the priority mapping of described not tape label message, is described default priority.
3. method according to claim 2, is characterized in that, at described local device, judges that described default priority is that after this locality enables the priority of PFC, described method also comprises:
Described local device is described default priority by take the message priority-level mapping of the message that the form of tape label message sends.
4. method according to claim 3, is characterized in that, described local device is that described default priority comprises by the message priority-level mapping of described message:
Local device judges whether the message priority of described message is the priority that this locality enables PFC, and judgment result is that be in the situation that, by the message priority-level mapping of described message, is described default priority.
5. according to the method described in any one in claim 1 to 4, it is characterized in that, after described local device receives the control TLV field of described first symmetric parameter transmission, described method also comprises:
Whether not w position in the control TLV field that described local device transmits according to described first symmetric parameter judges the support parameter negotiation of described opposite equip., and judgment result is that be and described local device support parameter consults in the situation that local PFC to be enabled to parameter and be arranged to the PFC of described opposite equip. and enable parameter.
6. according to the method described in any one in claim 1 to 4, it is characterized in that, after described local device receives the control TLV field of described first symmetric parameter transmission, described method also comprises:
Described opposite equip. receives the control TLV field from second symmetric parameter transmission of described local device, w position in the control TLV field transmitting according to described second symmetric parameter judges whether described local device is that support parameter is not consulted, and judgment result is that be and opposite equip. support parameter consults in the situation that the PFC of opposite equip. to be enabled to parameter and be arranged to the PFC of described local device and enable parameter.
7. a volume control device, is characterized in that, comprising:
Receiver module, for receiving the control TLV field from first symmetric parameter transmission of opposite equip., wherein, carries the default priority of corresponding opposite equip. port in the control TLV field that described first symmetric parameter transmits;
Acquisition module, obtains described default priority for the control TLV field transmitting from described first symmetric parameter;
Mapping block, for being described default priority by the priority mapping of not tape label message to be sent.
8. device according to claim 7, is characterized in that, described mapping block comprises:
Judgement submodule, for judging whether described default priority is the priority that this locality enables PFC;
The first mapping submodule, in the situation that judgment result is that of described judgement submodule is to be described default priority by the priority mapping of described not tape label message.
9. device according to claim 8, is characterized in that, described mapping block also comprises:
The second mapping submodule, in the situation that judgment result is that of described judgement submodule is to be described default priority by take the message priority-level mapping of the message that the form of tape label message sends.
10. device according to claim 9, is characterized in that, described the second mapping submodule comprises:
Judging unit, for judging whether the message priority of described message is the priority that this locality enables PFC;
Map unit, for judgment result is that be in the situation that, is described default priority by the message priority-level mapping of described message.
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| CN102315970B (en) * | 2011-09-23 | 2013-09-18 | 北京星网锐捷网络技术有限公司 | Data center bridging parameter configuration method, system and network equipment |
| CN103746927B (en) * | 2013-12-27 | 2017-02-15 | 杭州华为数字技术有限公司 | Priority-based fluid control PFC (Power Factor Correction) method, transmitting device and receiving device |
| CN104917694A (en) * | 2015-06-15 | 2015-09-16 | 上海斐讯数据通信技术有限公司 | Flow control method based on priority |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101083652A (en) * | 2006-05-30 | 2007-12-05 | 大唐移动通信设备有限公司 | Iub port flow control method |
| CN101252526A (en) * | 2008-04-03 | 2008-08-27 | 中兴通讯股份有限公司 | Flow control method as well as VPWS network system |
| CN101510846A (en) * | 2009-03-30 | 2009-08-19 | 北京邮电大学 | System and method for implementing self-governing QoS based on service network differentiation and IPv6 spreading head |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101083652A (en) * | 2006-05-30 | 2007-12-05 | 大唐移动通信设备有限公司 | Iub port flow control method |
| CN101252526A (en) * | 2008-04-03 | 2008-08-27 | 中兴通讯股份有限公司 | Flow control method as well as VPWS network system |
| CN101510846A (en) * | 2009-03-30 | 2009-08-19 | 北京邮电大学 | System and method for implementing self-governing QoS based on service network differentiation and IPv6 spreading head |
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