CN100388721C - Method for protecting coupling based on flow control transfer protocol - Google Patents
Method for protecting coupling based on flow control transfer protocol Download PDFInfo
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- CN100388721C CN100388721C CNB031159702A CN03115970A CN100388721C CN 100388721 C CN100388721 C CN 100388721C CN B031159702 A CNB031159702 A CN B031159702A CN 03115970 A CN03115970 A CN 03115970A CN 100388721 C CN100388721 C CN 100388721C
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Abstract
The present invention relates to a method for protecting SCTP couplings between a master processor and a standby processor in an IP network, which comprises the following steps: a local master processor and a standby processor establish an SCTP coupling with opposite end points; the coupling of the master processor enters a coupling establishing state, and the standby processor enters into a coupling backup establishing state. The coupling established on the master processor carries out a complete SCTP protocol process, and the standby processor enters into the backup establishing state. When the coupling on the master processor breaks off or closes, the master processor and the standby processor are switched, and roles are converted for operating normally. The present invention is conveniently and reliably realized, has no specific demand on the realization modes of a local IP network layer and an opposite layer. Moreover, the present invention has high efficiency, and the present invention can not obviously increase the processing load of a system.
Description
Technical field
The present invention relates to the communications field; specifically; relate to the method that the coupling based on SCTP in the IP network (hereinafter to be referred as the SCTP coupling, SCTP is the abbreviation of Stream Control Transmission Protocol) is protected between active and standby processor.
Background technology
Along with the fusion of traditional electrical road network and emerging IP network, the signaling in many application requirements circuit networks extends in the IP network.Will be in IP network the signaling of transmission circuit network, must consider that the circuit network signaling is based on the situation of message more, and, therefore find a suitable host-host protocol very crucial the requirement of aspects such as reliability, time delay.Transmission Control Protocol is the transport layer protocol of being used widely on IP network, it provides reliable data flow transmission service on insecure network layer (IP), yet the transmission service request application program based on byte stream that it shows many limitation: TCP in many application such as transmission circuit network signaling will be defined for the message of oneself and be distinguished, and application program must realize that a full message is in transmission within reasonable time by loaded down with trivial details modes such as PUSH operations; A plurality of addresses are not supported in single TCP connection, so increased application program in the complexity of using aspect multihomed host raising transmission reliability; It is under attack that TCP also has many weakness that it is easy to aspect fail safe, is difficult to adapt to the needs of signaling transmission.IETF has proposed Stream Control Transmission Protocol and has adapted to the needs that transmit the telecommunications network signaling on IP network for this reason, also can have simultaneously widely and use.
SCTP is a connection-oriented transport layer protocol, and it sets up the transmission service that coupling provides reliable user oriented message between the SCTP endpoint of equity.With respect to other host-host protocols such as TCP, it has many advantages to make it to be more suitable for to transmit to real-time and all exigent telecommunications network signaling of reliability, in a coupling, support a plurality of IP address such as SCTP, and to the management in path between the different addresses, this provides the wrong redundant ability of network level, make it to have better reliability, can conveniently be applied to the transfer of data under the multihomed host environment.
Because Stream Control Transmission Protocol is widely used in field of telecommunications; and in carrier-class is used, all require the 1+1 backup of physical equipment under a lot of situations; therefore realize that SCTP is coupled at the protection between the different processors, make processor when carrying out active and standby the switching, avoid the losing of the user message of closing, rebuliding and cause thus of SCTP coupling to be undoubtedly very useful and necessary with service disconnection.But in the protocol frame of existing IETF; just having proposed a SCTP is coupled on the multihomed host and utilizes multipath mechanism that the IP path is carried out backup protection; and by the coupled backup of SCTP client layer (as M3UA) different SCTP between nonidentical processor (this mode does not propose how to guarantee not the losing of user data, not out-of-sequence; and when using based on whole network topology, with the realization of opposite end and use relevant).For how realizing that a SCTP is coupled at the protection between the nonidentical processor, guarantee that not losing of number of users data when processor switches is not out-of-sequence, and also irrelevant with the network construction form and the way of realization of coupling the other side end points, IETF does not propose a solution.
Since Stream Control Transmission Protocol be one by confirm-reply-retransmission mechanism guarantees the agreement of reliable transmission; the user data of any one transmission can not successfully be transferred to the opposite end by predetermined transmission sequence number and obtain replying and all will finally cause coupling to be interrupted; therefore want to keep the SCTP coupling not only to need antithesis joint control system information to protect, and need protect receiving and sending messages of user data.Data messages such as the transmission of user data, reception, affirmation, order recovery and burst reorganization are real-time change, and often data volume is very big in application, therefore directly between processor, carry out in real time above-mentioned information not only realize synchronously very complicated, and inefficiency.Another kind method is that the data-message of upper-layer user and network layer is sent on the different processors simultaneously, hope comes the operation of synchro system by the method for synchronous outside input, many to be difficult to synchronous fully factor relevant but because the operation of SCTP transfer of data is with the timer of processor self etc., even very little asynchronously also may accumulate expansion, be easy to cause the instability of system's operation.
Summary of the invention
The object of the present invention is to provide a kind of method of protecting based on the coupling of SCTP; or rather; provide a kind of method of between active and standby processor, one or more SCTP couplings being protected; coupling is not interrupted and is restarted when guaranteeing to greatest extent that active and standby machine switches, and user message is not lost not out-of-sequence.
Technical scheme of the present invention is the method for protecting based on the coupling of SCTP (SCTP); comprise master processor based on each end points in the IP network of SCTP communication and be equipped with processor; active and standby processor each has one or more IP address and can communicate by letter with the opposite end, may further comprise the steps:
1.1 the active and standby machine of local terminal is set up the SCTP coupling with the opposite end end points, the main frame coupling enters coupling and sets up state, and standby host enters coupling backup set-up state;
1.2 the coupling carrying user data transport service of setting up on the main frame, the data of reception opposite end are also confirmed, the Stream Control Transmission Protocol flow process of complete, standby host enter the coupling of setting up Status of Backups only receives opposite end detective path accessibility on an IP address heartbeat message (HeartBeat) and response;
1.3 when coupling on the main frame was ended or closed, the notice standby host was removed coupling backup set-up state; When standby host reception opposite end is closed or is ended connection request message, this message is sent to host process, standby host starts the back has been set up coupling to host request control information;
When 1.4 active and standby machine switches; the coupling of setting up on the original host stops to receive to end data; and the uncompleted transmission of local terminal; receive data content and be sent to standby host by intercommunication with the relevant information of data; enter coupling backup set-up state after transmission is finished and become new standby host; being in the coupling of setting up Status of Backups on the former standby host sets up timer to wait for reception original host protected data information; coupling enters and normally sets up state work and become new main frame after finishing; if former standby host can not successfully receive protected data from original host before timer expiry, should initiate coupling to the opposite end immediately and restart process.
In said method, the active and standby machine of the local terminal in the step 1.1 is set up coupling with the opposite end end points, may further comprise the steps:
2.1 all IP addresses of active and standby machine are sent to the opposite end, and making coupling set up the opposite end, back has different paths can arrive active and standby machine;
2.2 when local terminal initiates to set up coupling, initiate from main frame; Control information with coupling after the main frame coupling is set up is sent to standby host by the inner passage, and standby host enters coupling backup set-up state;
2.3 when the local terminal main frame is received the request of coupling of setting up of opposite end, carry out and set up flow process, coupling set up aft engine with the control information of coupling by the intercommunication channel transfer to standby host, standby host enters coupling backup set-up state; When the local terminal standby host receive the opposite end set up the coupling request time, this message is passed to host process, or standby host finish voluntarily coupling set up after the process control information with coupling by the intercommunication channel transfer to main frame, main frame enters coupling and sets up state, standby host enters coupling backup set-up state.
Control information in the such scheme comprises the IP address, port numbers, checking label at the state of setting up, the two ends of coupling etc.
Can see from technique scheme, adopt method of the present invention after, the control information in the time of only need setting up or close coupling when processor does not switch is carried out synchronously.When normal operation, do not need the mass data information of dynamic change is carried out synchronously, and when processor switches, only need the data message of current fixed time be carried out synchronously.It is convenient, reliable and stable so not only to realize, and very low to the bandwidth requirement of active and standby processor intercommunication, also the normal operation increase of system is not loaded.The present invention simultaneously is ingenious to have utilized the multipath characteristic of Stream Control Transmission Protocol and expansion to be applied on two processors, utilizes the repeating transmission of opposite end Stream Control Transmission Protocol itself and main path handover mechanism to realize that the coupling opposite end sends to the protection of Local Data when the local terminal processor switches.Another advantage of the present invention is irrelevant with network topology structure and opposite end specific implementation form, and is also irrelevant with the specific implementation of local terminal IP network layer, highly versatile.In addition, at abnormal conditions such as master processor sudden power, the present invention proposes and carry out coupling fast and rebuild the mechanism that at utmost reduces user data loss.
Method of the present invention realizes convenient and reliable, and the implementation of local terminal IP network layer and the implementation of opposite end are not had specific (special) requirements, highly versatile; And the efficient height, can obviously not increase the weight of the processing of system and load.
Description of drawings
Fig. 1 is the basic flow sheet of the inventive method;
Fig. 2 is that SCTP is coupled at the schematic diagram of working between active and standby machine;
Fig. 3 is the flow chart of main frame coupling protection when switching to standby host;
Fig. 4 is the flow chart of standby host coupling protection when switching to main frame;
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are described in detail.
Fig. 1 is the basic flow sheet of method of the present invention.At first, the active and standby machine of local terminal is set up the SCTP coupling with the opposite end end points, and the main frame coupling enters coupling and sets up state, and standby host enters coupling backup set-up state; Then, the coupling carrying user data transport service of setting up on the main frame, the data of reception opposite end are also confirmed, the Stream Control Transmission Protocol flow process of complete, standby host enter the coupling of setting up Status of Backups only receives opposite end detective path accessibility on an IP address heartbeat message (HeartBeat) and response; When coupling on the main frame was ended or closed, the notice standby host was removed coupling backup set-up state; When standby host reception opposite end is closed or is ended connection request message, this message is sent to host process, standby host starts the back has been set up coupling to host request control information; When active and standby machine switches; the coupling of setting up on the original host stops to receive to end data; and the uncompleted transmission of local terminal; receive data content and be sent to standby host by intercommunication with the relevant information of data; enter coupling backup set-up state after transmission is finished and become new standby host; being in the coupling of setting up Status of Backups on the former standby host sets up timer to wait for reception original host protected data information; coupling enters and normally sets up state work and become new main frame after finishing; if former standby host can not successfully receive protected data from original host before timer expiry, should initiate coupling to the opposite end immediately and restart process.
Fig. 2 is that SCTP is coupled at the schematic diagram of working between active and standby machine.As shown in the figure, the local terminal main frame can be communicated by letter the opposite end with the IP address that standby host each has oneself, sets up in the process control informations such as the state of setting up by intercommunication coupling synchronously between active and standby machine, address, two ends, port numbers, checking label in coupling.Standby host should have been set up the control information of coupling to host request after startup.
After coupling was set up, complete Stream Control Transmission Protocol function was finished in the coupling that is in the state of foundation on the main frame, and the IP address of main frame is available fully, according to the transmitting-receiving of agreement carrying user data with to the affirmation of end data.Corresponding coupling is in and sets up Status of Backups on the standby host, on standby host IP address, be in the DATA message that the coupling of setting up Status of Backups does not receive the opposite end, also not to its affirmation, the data that make the opposite end send to standby host IP address like this can be retransmitted to main frame, and the opposite end finally can select the IP address of main frame to carry out transfer of data as main path.(Chinese is " heartbeat message " but standby host receives the HeartBeat of opposite end on the IP address of oneself, promptly periodically send, responding the message of detective path accessibility according to the heartbeat of whether receiving the opposite end) (Chinese is " heartbeat response message " to information and sending HeartbeatAck message, the i.e. message that the heartbeat message of receiving the opposite end is responded and confirms) confirm, make that like this this address is an available path for the opposite end, the opposite end can be data re-transmitting to this address when masterslave switchover.Main frame and standby host can each have a plurality of IP address, and in this case, all IP addresses of main frame can be used; Standby host has only an IP address can receive the other side's HeartBeat message and confirms, having only an IP address like this on the standby host is available path for the opposite end, and the data that the opposite end is retransmitted can not taken turns commentaries on classics between the IP address of standby host.
When the main frame coupling is closed, ended or restarts, should be synchronized to standby host to state variation.If the standby host coupling receives that the coupling of opposite end other control messages such as closed, ends, restarts, then the main frame that should transmit carries out respective handling.
Fig. 3 is the flow chart of main frame coupling protection when switching to standby host.When the master-＞when switching fully, the SCTP coupling of having set up on the original host stops to receive the data-message that the IP layer reports, the data of simultaneously having given local terminal the upper-layer user but not sent as yet, send but the data that do not obtain as yet confirming, receive but do not finish the data of order recovery as yet, receive but do not finish the data of burst reorganization as yet, the transmission information such as sequence number that send reception are synchronized to new main frame (former standby host) by intercommunication, the coupling of setting up on the original host enters coupling backup set-up state work then.Because coupling this moment no longer receives data-message and confirms from its IP address, will cause the opposite end, and finish the conversion of main path to new main frame with the available path of data re-transmission to new main frame.
Fig. 4 is the flow chart of standby host coupling protection when switching to main frame.When be equipped with-＞during main the switching, be in the SCTP coupling of setting up Status of Backups on the former standby host and start timer and wait for the protected data that receives original host.After the protected data of having received original host before the timer expiry, stop waiting timer, and recover the transmission state of coupling, coupling this moment then enter and normally set up state and carry out work with the data that receive.If waiting timer is overtime; then explanation is because abnormal conditions original host data can't be protected standby host; in order to reduce the break period of user data transmission as far as possible; being in the coupling of setting up Status of Backups on this stylish main frame should utilize the control informations such as address, opposite end of this preamble to initiate the coupling reconstruction to the opposite end; perhaps ending coupling causes the other side to carry out the coupling reconstruction; the variation of coupling state should be notified client layer, and attempts being synchronized to standby host.
In sum, adopt the present invention, can realize easily that SCTP is coupled at the protection between the nonidentical processor, realize at utmost that when active and standby machine switches coupling do not interrupt and not the losing of user data transmission, not out-of-sequence.Even host data can't be synchronized under the abominable situation of standby host when switching, also can reduce the break period of user data transmission by Fast Reconstruction.
Claims (3)
1. method to protecting based on the coupling of SCTP SCTP; comprising main frame and standby host based on each end points in the IP network of SCTP communication; active and standby machine each has one or more IP address and can communicate by letter with the opposite end, it is characterized in that, may further comprise the steps:
1.1 the active and standby machine of local terminal is set up the SCTP coupling with the opposite end end points, the main frame coupling enters coupling and sets up state, and standby host enters coupling backup set-up state;
1.2 the coupling carrying user data transport service of setting up on the main frame, the data of reception opposite end are also confirmed, the Stream Control Transmission Protocol flow process of complete, standby host enter the coupling of setting up Status of Backups only receives opposite end detective path accessibility on an IP address heartbeat message HeartBeat and response;
1.3 when coupling on the main frame was ended or closed, the notice standby host was removed coupling backup set-up state; When standby host reception opposite end is closed or ended connection request message, this message is sent to host process, the control information of the coupling of having set up before standby host starts to the host request main frame after standby host starts; 1.4 it is main; when standby host switches; the coupling of setting up on the original host stops to receive to end data; and the uncompleted transmission of local terminal; receive protected data information by the intercommunication channel transfer to standby host; original host entered coupling backup set-up state after transmission was finished becomes new standby host; being in the coupling of setting up Status of Backups on the former standby host sets up timer to wait for reception original host protected data information; former standby host enters coupling and sets up state work and become new main frame after finishing; if former standby host can not successfully receive protected data information from original host before timer expiry, should initiate coupling to the opposite end immediately and restart process.
2. the method to protecting based on the coupling of SCTP SCTP as claimed in claim 1 is characterized in that, the active and standby machine of the local terminal in the described step 1.1 is set up coupling with the opposite end end points, may further comprise the steps:
2.1 all IP addresses of active and standby machine are sent to the opposite end, and making coupling set up the opposite end, back has different paths can arrive active and standby machine;
2.2 when local terminal initiates to set up coupling, initiate from main frame; After the main frame coupling is set up with the control information of coupling by the intercommunication channel transfer to standby host, standby host enters coupling backup set-up state;
2.3 when the local terminal main frame is received the request of coupling of setting up of opposite end, carry out and set up flow process, coupling set up aft engine with the control information of coupling by the intercommunication channel transfer to standby host, standby host enters coupling backup set-up state; When the local terminal standby host receive the opposite end set up the coupling request time, this message is passed to host process, or standby host finish voluntarily coupling set up after the process control information with coupling by the intercommunication channel transfer to main frame, main frame enters coupling and sets up state, standby host enters coupling backup set-up state.
3. the method to protecting based on the coupling of SCTP SCTP as claimed in claim 1 or 2 is characterized in that, described control information comprises the state of setting up, the IP address at two ends, port numbers, the checking label of coupling.
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| CNB031159702A CN100388721C (en) | 2003-03-18 | 2003-03-18 | Method for protecting coupling based on flow control transfer protocol |
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| CNB031159702A CN100388721C (en) | 2003-03-18 | 2003-03-18 | Method for protecting coupling based on flow control transfer protocol |
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Families Citing this family (18)
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| CN101183969B (en) * | 2006-11-13 | 2010-05-12 | 中兴通讯股份有限公司 | Method of inhibiting IP link jitter in user adaptive layer of signaling network layer |
| CN101094240B (en) * | 2007-08-07 | 2013-01-16 | 中兴通讯股份有限公司 | Method for implementing function of multiple attributions in stream control and transmission protocol |
| CN101459530B (en) * | 2007-12-14 | 2012-10-17 | 华为技术有限公司 | Method, system and equipment for wireless network management and maintenance |
| CN101197772B (en) * | 2007-12-26 | 2012-10-03 | 华为技术有限公司 | Method, device and system for implementing multiple paths on media face |
| CN101527707B (en) * | 2008-03-07 | 2012-02-29 | 上海贝尔阿尔卡特股份有限公司 | Real-time consistency check method and correlative device for warm backup of SCTP protocol stack |
| CN101262437B (en) * | 2008-04-17 | 2011-07-13 | 中兴通讯股份有限公司 | A method for state migration of stream control transmission protocol |
| CN101415006B (en) * | 2008-11-25 | 2012-04-04 | 华为技术有限公司 | Method, apparatus and system for signaling migration |
| CN101515840B (en) * | 2009-03-09 | 2011-08-03 | 北京交通大学 | Route selecting method of multipath parallel transmission and delivery |
| CN101547474B (en) * | 2009-04-22 | 2014-03-12 | 中兴通讯股份有限公司 | Method and device for realizing IP signaling coupling bandwidth control |
| CN101674665B (en) * | 2009-10-22 | 2012-01-25 | 华为技术有限公司 | Wireless transmission interface building method and wireless transmission network element |
| CN101841463B (en) * | 2010-03-05 | 2012-05-16 | 清华大学 | Multipath cocurrent transmission method based on SCTP (Stream Control Transmission Protocol) |
| US8737210B2 (en) * | 2011-03-09 | 2014-05-27 | Telefonaktiebolaget L M Ericsson (Publ) | Load balancing SCTP associations using VTAG mediation |
| CN102891850A (en) * | 2012-09-25 | 2013-01-23 | 汉柏科技有限公司 | Method for preventing parameter resetting in IPSec (IP Security) channel updating |
| CN104243396A (en) * | 2013-06-07 | 2014-12-24 | 阿尔卡特朗讯公司 | Method of establishing relation between first endpoint and second endpoint, and related endpoint |
| CN103888283B (en) * | 2013-09-09 | 2018-05-18 | 京信通信系统（中国）有限公司 | A kind of SCTP communication means and device |
| CN105897486B (en) * | 2016-06-07 | 2019-05-10 | 武汉邮电科学研究院有限公司 | A kind of method of Stream Control Transmission Protocol Service hot backup |
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