CN100413252C - Backup system and method for access servo interface - Google Patents
Backup system and method for access servo interface Download PDFInfo
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- CN100413252C CN100413252C CNB2004100972902A CN200410097290A CN100413252C CN 100413252 C CN100413252 C CN 100413252C CN B2004100972902 A CNB2004100972902 A CN B2004100972902A CN 200410097290 A CN200410097290 A CN 200410097290A CN 100413252 C CN100413252 C CN 100413252C
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Abstract
The present invention relates to the communication field, which discloses a backup system and a method for interfaces of an access server. The present invention can ensure that network visiting users are not influenced under the condition of no requirements for manual intervention when interfaces of a working access server fail. The present invention has the principle that the interfaces of the access server which are in the mutually main/standby relation are provided, and a main interface of the access server periodically transmits a first message to a standby interface of the access server. When the main interface of the access server fails, the standby interface of the access server decides the occurrence of a failure when the standby interface of the access server does not receive the first message from the main interface of the access server within a scheduled time, and the standby interface of the access server automatically sets the standby interface of the access server as a main interface of the access server so as to continue to offer an access service to users.
Description
Technical field
The present invention relates to the communications field, particularly the access servo interface redundancy technique in the data communication.
Background technology
Networks development is brought people into information-intensive society, along with popularizing of internet, internetworking agreement (Internet Protocol, be called for short " IP ") occupied the leading position of various terminal applies, the user is more and more higher to the demand of the network bandwidth, and broadband network becomes the trend of current network development.Because the backbone network bandwidth increases rapidly, traditional Access Network becomes the bottleneck of broadband network, and making up broadband access network becomes new focus.How more efficient, at a high speed, cheap transmit the emphasis that the IP data are communication network research from now on.
One of the internet that ethernet network provides as telco service provider (Internet) access way directly inserts the user towards Ethernet, is two layers of broadband access method of carrying IP data service the best, has obtained using widely.The user is a support platform with this network, can carry out multiple community intelligence services such as, shopping online interconnected such as safety management, estate management, user, video request program.Therefore, require ethernet network should be one and have high bandwidth, high reliability, the low construction and a low network safeguarding cost, be one and realize operation, the network of service is provided.
As shown in Figure 1, in the present ethernet network, generally at first be linked in two layers of access device 14 by user 15, user 16, those of ordinary skill in the art know, two layers of access device 14 normally only provide the Ethernet switch of two layers of function of exchange, but perhaps other can provide the two-layer equipment of ethernet data frame transparent transmission.Two layers of access device 14 generally work the effect of converging, and then be linked on the access server 13, the major function of access server 13 is that the user who inserts is controlled, comprise authentication, charging, control of authority, flow control, QOS etc., ethernet network is realized can runing and can managing, and distinguish with common computer network, key is on access server 13 roles.Legitimate traffic by access server 13, router one 2, router one 1 to the upper strata are transmitted, be connected to internet 10 at last, need to prove, because the network system of internet 10 is very huge,, then re-uses router one 1 and carry out the core routing forwarding so generally still need to use router one 2 to be used for the edge route assemblage earlier, so that network layer is clear, be convenient to maintenance and management.
This shows, access server 13 is at whole ethernet network, occupy important status, there has not been it just can't manage to user and network, if directly skip it, two layers of access device 14 are connected on the router one 1, in fact are exactly common computer network, those of ordinary skill in the art are clear, and common computer network can't provide carrier grade service.It is very reliable that the importance of access server 13 also requires it to be connected with interface between two layers of access device 14, but in the reality, always has various abnormal conditions and occur.Therefore, if situations such as server exception is restarted, hardware damage that the user side interface of access server 13 has occurred, user below it will be up to its recovery accesses network again, such situation is the carrier grade service that provides to the user not to be provided promise to undertake, is unfavorable for the popularization of ethernet network access way.
At present the solution that access server is broken down is to upgrade hardware or the access server that resets, the user that maybe will receive influence switch down on the standby access server by the network maintenance staff.
In actual applications, there is following problem in such scheme: though finally can make network recovery normal, take a long time.Even exceed the scope of user tolerance.This phenomenon is especially not serious at the scene the time the attendant.
Cause the main cause of this situation to be, such scheme is by safeguarding manually.Therefore not only man power and material's cost is higher, and time-consuming.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of backup method of access servo interface
And system, make when the access server of working breaks down, under the situation that does not need manual intervention, just also can guarantee not to be affected the user of accesses network.
For achieving the above object, the invention provides a kind of backup method of access servo interface, comprise following steps:
The mutually redundant a plurality of access servo interfaces of A are determined its main and standby relation according to the interface priority of self and other access servo interfaces;
The described main access servo interface of B regularly sends multicast message to being equipped with access servo interface during being in active state;
C when being equipped with access servo interface and surpassing predetermined amount of time and do not receive multicast message from described main access servo interface yet, enters steps A when described.
Wherein, described steps A comprises following substep:
The mutually redundant a plurality of access servo interfaces of A1 send the multicast message that comprises himself interface priority mutually;
The described access servo interface of A2 judges whether the other side's interface priority in the described multicast message of receiving is higher than this interface priority, if then this interface is set to access servo interface fully, otherwise this interface is set to main access servo interface.
Among the described step B, described main access servo interface sends described multicast message with 1 time/second frequency to the described access servo interface that is equipped with.
Described mutually redundant a plurality of access servo interfaces can be distributed on the different servers.
Described mutually redundant a plurality of access servo interfaces can be distributed on the identical server.
Comprise following content in the described multicast message:
The transmission time interval of version number, type of message, backup group sign, interface priority, described multicast message and be used for the described multicast message legitimacy of verification verification and.
Described multicast message also comprises auth type and authenticates employed random number and authentication value.
The present invention also provides a kind of standby system of access servo interface, comprise mutually redundant a plurality of access servo interface, wherein, described a plurality of access servo interfaces are determined main and standby relation according to the interface priority of self and other access servo interfaces, and
Described main access servo interface is used for during being in active state, regularly sends multicast message to being equipped with access servo interface;
Described access servo interface fully is used to monitor the multicast message from described main access servo interface, and when not receiving described multicast message yet above the scheduled time, self be set to main access servo interface, redefine main and standby relation between described a plurality of access servo interface according to the interface priority of self and other access servo interfaces.
Wherein, described mutually redundant a plurality of access servo interfaces are distributed on the different servers.
Described mutually redundant a plurality of access servo interfaces are distributed on the identical server.
By relatively finding that technical scheme difference with the prior art of the present invention is, has been equipped with the access servo interface of main and standby relation each other, main access servo interface regularly sends first message to being equipped with access servo interface.When main access servo interface breaks down, be equipped with access servo interface and judge that by first message of not receiving autonomous access servo interface in the given time it breaks down, and self be set to main access servo interface automatically, continue as the user access service is provided.
Difference on this technical scheme has brought comparatively significantly beneficial effect, can check out comparatively in time that promptly main access servo interface breaks down, and carries out work by being equipped with alternative its of access servo interface immediately.Thereby when having avoided main access servo interface to break down, the user in accesses network is just produced tangible influence, improved user satisfaction.And this method is compared with prior art, saves man power and material's cost more.
Fig. 2 is an ASSP multicast message form schematic diagram according to an embodiment of the invention;
Fig. 3 is the standby system structural representation of access servo interface according to an embodiment of the invention;
Fig. 4 is an access servo interface masterslave switchover schematic flow sheet according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention has used the thought of redundancy backup, has adopted a kind of new access server backup protocol (Access Server Standby Protocol is called for short " ASSP "), and the access servo interface of ethernet network key has been carried out backup protection.Redundancy backup needs two same parts to realize at least, among the present invention, employing is such as two or more access servo interfaces, one as main access servo interface, all the other are as the backup access servo interface, the state that needs to obtain in real time the other side between the two to be safeguarding the state machine of self, thereby defined ASSP, and the active and standby access servo interface of backup communicates by the ASSP multicast message mutually.It needs to be noted, active and standby access servo interface can be on same access server, also can be on different access server, but in order to prevent that whole access server from going wrong, therefore, generally realize backup by the interface of two different access servers.
Because ASSP important function in the present invention at first describes the form of its multicast message below in conjunction with Fig. 2.Among Fig. 2, ASSP multicast message total length is 28 bytes, i.e. 224bit position, and for convenience of explanation, Fig. 2 is divided into 7 sections, overlapping discharging with it for one section by per 4 bytes.In the whole message, defined some special fields, be used for active and standby access servo interface and transmit information by different length, from the beginning as follows respectively from each field of tail and implication:
1, version number (Version): be 1 at present;
2, type of message (Type): have only at present a kind of, i.e. ADVERTISEMENT, value is 1;
3, backup group sign (Backup Group ID): the backup group at sign interface place;
4, the priority of interface (Priority);
5, auth type (Auth Type): do not authenticate at present and md5-challenge the 5th edition (Message-Digest algorithm 5, two kinds of abbreviation " MD5 " authentications;
6, the transmission time interval of ASSP message (Adver Interval);
7, keep position (Reserved): temporarily do not use, expansion is in the future used;
8, verification and (Check Sum): the legitimacy that is used for the whole ASSP message of verification;
9, random number (Random): useful during md5 authentication, of no use when not authenticating;
10, authentication value (Auth Value): useful during md5 authentication, of no use when not authenticating.
Here need to prove, the MD5 algorithm uses does not need to pay any copyright fee, so be a large amount of a kind of security algorithms that adopt under the authentication scenario of non-top-secret application, its effect is to allow big capacity information be ' compressed ' into a kind of secret form before signing private secret key with digital signature software, promptly the byte serial of a random length is transformed into the big integer of a fixed length, is reached for the purpose of the information encryption that needs authentication in this way.Also will replenish a bit at last, the message format of Fig. 2 only is a kind of form, as required can also local modification.
Below promptly be the detailed description of ASSP multicast message among the present invention, in addition, next the present invention also needs active and standby access server is beforehand with following simple setting.
At first, the active and standby part of access server that needs is backed up mutually is provided with a backup group.Only the interface in same backup group could send the ASSP message mutually.Reduce the scope of ASSP message multicast as far as possible, avoid tying up the customer traffic bandwidth.
Secondly, the priority of each interface in the sign backup group is used at the main access servo interface of backup group election.
Next, make main access servo interface be in active state, can normally receive and dispatch the interface of the message of upstream or downstream, the message here mainly refers to an access lot of data between server and the two layers of access device, comprise control flows data such as authentification of user, charging, control of authority, flow control, QOS, also comprise the data flow that exchanges between user and the external the Internet, also comprise the ASSP multi-cast message data certainly.
At last, setting is equipped with access servo interface and is in inactive state, can only receive the ASSP message, does not does not receive and dispatch the interface of other any message.Be equipped with the variation that access server monitors the ASSP message constantly, after main access servo interface occurs unusually, be equipped with access servo interface and be upgraded to main access servo interface automatically, limited by electronic device, be less than the manual switching time far away, satisfy the carrier class requirement fully.
Below in conjunction with Fig. 3, Fig. 4, the standby system of the access servo interface that proposes according to principle of the present invention and the backup method of access servo interface are described respectively.
As shown in Figure 3, the standby system of the access servo interface of this enforcement mainly comprises mutually redundant 2 access servo interfaces 330 and 340, and they determine main and standby relation according to both sides' interface priority.Specifically, they send the ASSP message that comprises himself interface priority mutually, and judge whether the other side's interface priority is higher than this interface priority in the message of receiving, if, then this interface is set to access servo interface fully, otherwise this interface is set to main access servo interface.Need to prove that herein according to principle of the present invention, mutually redundant access servo interface quantity is not limit and 2, can be a plurality of arbitrarily, one of them is main access servo interface, and all the other all are to be equipped with access servo interface.
Main access servo interface is used for during being in active state, regularly send first message to being equipped with access servo interface, access servo interface is used to monitor first message from described main access servo interface fully, and, self be set to main access servo interface surpassing the scheduled time when not receiving described first message yet.
Further describe the working condition of said system below.The user 36, user 37 at first is linked in two layers of access device 35, through converging of two layers of access device 35, and then be linked on certain interface 330 of access server 33, simultaneously, interface 340 with interface 330 mutually redundant another access servers 34, also receive on two layers of access device 35, and they are all drawn at same VLAN (Virtual Local Area Network, be called for short " VLAN ") in, need to prove, the scope of influence when dividing broadcast storm that same VLAN can reduce the two into and taking place can avoid tying up user's bandwidth equally.Two access servers up is connected on the same router on 32, is connected to internet 30 step by step at last by router three 1 again.
The network topology transformation has more than been described.Next further specify the flow process that realizes the backup of ASSP access servo interface on the software, as shown in Figure 4:
At first, step 410 is processes of default setting.Under the default situations, the interface of all access servers is main access servo interface in initial state entirely, and promptly mutually redundant interface 330, interface do not have active and standby differentiation 340 this moments, can both receive and dispatch any message normally.
Next, after mutually redundant interface 330, interface 340 are configured in same backup group and enable the ASSP agreement, they just send the ASSP multicast message mutually, carried its own interfaces priority in the message, because in same VLAN, therefore, interface 330 can be received the ASSP message that interface 340 sends for the two, equally, interface 340 also can be received the ASSP message that interface 330 sends.
Then, step 430 is processes of a judgement, also is the watershed that interface 330 and interface 340 are distinguished activestandby state.After two interfaces are received the ASSP message that the other side sends, take out the priority in the message and the priority of its own interfaces and compare, if find the other side's priority height, then this interface enters step 440, is not higher than self priority if find the other side's priority, then carry out step 431.
In step 431, because in front step 430, the priority that interface is judged the other side is not higher than self priority, so in this step self is remained main access server state.In the present embodiment, set interface 330 and occupy this state, the priority that is interface 330 is higher than interface 340, and have only two interfaces in the backup group, like this, behind the ASSP message interaction, it just becomes main access service interface, when working properly, undertake the data flow transmission tasks of 35 of access server 33 in the whole network and two layers of access devices, and can normally receive and dispatch any message.After being set to main access servo interface, during being in active state, will regularly send the ASSP message to being equipped with access servo interface, this will describe in follow-up step 470.
In step 440, because in the step 430 of front, the priority that interface is judged the other side is higher than self priority, so in this step, need be with the access servo interface fully that is set as of self.In the present embodiment, set interface 340 and occupy this state, promptly the priority of interface 330 is lower than interface 340, like this, behind the ASSP message interaction, it just becomes access service interface fully, before becoming new main access service interface subsequently future, can only receive the ASSP message.
Enter step 450 subsequently, be equipped with access servo interface and judge whether to surpass the ASSP message that predetermined amount of time does not receive autonomous access servo interface yet.This step is a deterministic process to access servo interface 340, and this judgement is made according to the ASSP message interval situation that supervision constantly receives.Set limit value if surpass, then continue to remain access servo interface state fully.If surpass limit value, then forward step 460 to.
In step 460, after main interface was unusual, all interfaces fully can not received first message that main interface sends, and like this, surpass the scheduled time, and all interfaces fully all will be upgraded to main interface.At this moment, be equivalent to get back to the default setting state, all interfaces can send the ASSP message that comprises self priority again, finally can elect a main interface, other become interface fully.
At last, in step 470,, during it is in active state, regularly send the ASSP message to being equipped with access servo interface for main access servo interface.
Sum up above step, when interface 330 and interface 340 operate as normal, after the two elected active and standby interface, all users of two layers of access device 35 just can only be by interface 330 visit Internet.Interface 330 can regularly outwards send the ASSP message as 1 second 1 time when being in active state.Like this, as long as interface 330 is normal, interface 340 just can be received the ASSP message always, thereby knows that interface 330 is in active state, keeps being equipped with the access servo interface state always.Those of ordinary skill in the art can understand, and the frequency that regularly outwards sends the ASSP message can be configured and revise as required.
When interface 330 generations are unusual, interface 340 just can't be received the ASSP message, if the limit value of surpass setting, as would not received the ASSP message that interface 330 sends in continuous 3 seconds, interface 340 knows that just interface 330 has taken place to become main access servo interface automatically unusually.At this moment, all users under two layers of access device 35 just can be by interface 340 visit Internet.To switch to time of main access servo interface very short because interface 340 is by being equipped with access servo interface, normally several seconds are concerning the user, because the processing of IP network upper-layer protocol, be not feel relevant variation, obviously reached the requirement of carrier grade service.
More than be two embodiment that belong to the interface realization backup of different access servers, if two interfaces belong to same access server, flow process is similar with it, but only has the redundancy backup of interface level, and has lacked the redundancy backup of access server level.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (10)
1. the backup method of an access servo interface is characterized in that, comprises following steps:
The mutually redundant a plurality of access servo interfaces of A are set to a backup group, and a plurality of access servo interfaces in the described backup group are determined its main and standby relation according to the interface priority of self and other access servo interfaces;
The described main access servo interface of B regularly sends multicast message to being equipped with access servo interface during being in active state;
C when being equipped with access servo interface and surpassing predetermined amount of time and do not receive multicast message from described main access servo interface yet, enters steps A when described.
2. the backup method of access servo interface according to claim 1 is characterized in that, described steps A comprises following substep:
The mutually redundant a plurality of access servo interfaces of A1 send the multicast message that comprises himself interface priority mutually;
The described access servo interface of A2 judges whether the other side's interface priority in the described multicast message of receiving is higher than this interface priority, if then this interface is set to access servo interface fully, otherwise this interface is set to main access servo interface.
3. the backup method of access servo interface according to claim 1 is characterized in that, among the described step B, described main access servo interface can send described multicast message to the described access servo interface that is equipped with 1 time/second frequency.
4. according to the backup method of any described access servo interface of claim 1 to 3, it is characterized in that described mutually redundant a plurality of access servo interfaces can be distributed on the different servers.
5. according to the backup method of any described access servo interface of claim 1 to 3, it is characterized in that described mutually redundant a plurality of access servo interfaces can be distributed on the identical server.
6. the backup method of access servo interface according to claim 4 is characterized in that, comprises following content in the described multicast message:
The transmission time interval of version number, type of message, backup group sign, interface priority, described multicast message and be used for the described multicast message legitimacy of verification verification and.
7. the backup method of access servo interface according to claim 6 is characterized in that, described multicast message also comprises auth type and authenticates employed random number and authentication value.
8. the standby system of an access servo interface, it is characterized in that, comprise mutually redundant a plurality of access servo interface, described mutually redundant a plurality of access servo interfaces are set to a backup group, a plurality of access servo interfaces in the described backup group are determined main and standby relation according to the interface priority of self and other access servo interfaces, and
Described main access servo interface is used for during being in active state, regularly sends multicast message to being equipped with access servo interface;
Described access servo interface fully is used to monitor the multicast message from described main access servo interface, and when not receiving described multicast message yet above the scheduled time, self be set to main access servo interface, redefine main and standby relation between described a plurality of access servo interface according to the interface priority of self and other access servo interfaces.
9. the standby system of access servo interface according to claim 8 is characterized in that, described mutually redundant a plurality of access servo interfaces are distributed on the different servers.
10. the standby system of access servo interface according to claim 8 is characterized in that, described mutually redundant a plurality of access servo interfaces are distributed on the identical server.
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| CNB2004100972902A CN100413252C (en) | 2004-11-25 | 2004-11-25 | Backup system and method for access servo interface |
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| CNB2004100972902A CN100413252C (en) | 2004-11-25 | 2004-11-25 | Backup system and method for access servo interface |
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| CN100413252C true CN100413252C (en) | 2008-08-20 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1964249B (en) | 2006-10-20 | 2010-08-25 | 华为技术有限公司 | A method and device to realize punch-through of point-to-multipoint network link status |
| CN101394264B (en) * | 2007-09-21 | 2012-01-25 | 华为技术有限公司 | Monitoring method and device for periodically packet transmission |
| CN101299764B (en) * | 2008-06-19 | 2014-09-10 | 中兴通讯股份有限公司 | Method for backupping broadband access server for PPPOE access service |
| US8094569B2 (en) * | 2008-12-05 | 2012-01-10 | Cisco Technology, Inc. | Failover and failback of communication between a router and a network switch |
| CN102025476B (en) * | 2009-09-23 | 2014-02-26 | 中兴通讯股份有限公司 | Method for realizing user port positioning in BRAS (Broadband Remote Access Server) multicomputer backup scene and network system |
| CN101815315B (en) * | 2010-03-12 | 2015-05-13 | 中兴通讯股份有限公司 | Redundancy backup swap method, device and system |
| JP2013545151A (en) * | 2010-12-10 | 2013-12-19 | 日本電気株式会社 | Server management apparatus, server management method, and program |
| CN102891868B (en) * | 2011-07-19 | 2016-09-28 | 上海可鲁***软件有限公司 | The load-balancing method of a kind of distributed system and device |
| CN104243241B (en) * | 2014-09-26 | 2018-01-12 | 广州华多网络科技有限公司 | The method and device of operational trials |
| CN106506364A (en) * | 2016-12-08 | 2017-03-15 | 努比亚技术有限公司 | A kind of cut-in method, client and routing server |
| CN107104830B (en) * | 2017-04-18 | 2020-09-04 | 广东浪潮大数据研究有限公司 | Multi-server switching method and system |
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| CN1302022A (en) * | 1999-12-29 | 2001-07-04 | 上海龙林通讯技术开发有限公司 | Thermal backup method of IP network equipment |
| JP2003052074A (en) * | 2001-08-06 | 2003-02-21 | Sony Corp | Communication system and method therefor, communication enterpriser server, processing method thereof, computer program and storage medium |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1302022A (en) * | 1999-12-29 | 2001-07-04 | 上海龙林通讯技术开发有限公司 | Thermal backup method of IP network equipment |
| JP2003052074A (en) * | 2001-08-06 | 2003-02-21 | Sony Corp | Communication system and method therefor, communication enterpriser server, processing method thereof, computer program and storage medium |
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