CN101304346B - Method and apparatus for monitoring link - Google Patents
Method and apparatus for monitoring link Download PDFInfo
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- CN101304346B CN101304346B CN2008101157368A CN200810115736A CN101304346B CN 101304346 B CN101304346 B CN 101304346B CN 2008101157368 A CN2008101157368 A CN 2008101157368A CN 200810115736 A CN200810115736 A CN 200810115736A CN 101304346 B CN101304346 B CN 101304346B
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Abstract
The invention discloses a link monitoring method and a device thereof, which sends monitoring massage to a distal reliable device by a main line and receives response message of the distal reliable device. If the response message of the distal reliable device is not received during the preset time, the device is switched to a backup line. By the scheme provided by the invention embodiment, even though the intermediate link of the distal reliable device connected by the main line of a network device has problems which can not be perceived by the hardware of network devices, the device can perceive that the link has problems in minimum time by the software and can be automatically switched to the backup line in a shorter time without artificial intervention, thereby improving the link monitoring capacity of the network devices.
Description
Technical field
The present invention relates to the Computers and Communication technical field, relate in particular to a kind of link monitoring method and device.
Background technology
Between domain name on the Internet and IP address is one to one, though domain name is convenient to people's memory, can only be familiar with the IP address mutually between the machine, and the conversion work between them is called domain name mapping.Domain name mapping need be finished by special domain name resolution server, and name server (DNS, Domain NameServer) is exactly the server that carries out domain name mapping.Generally, a lot of well-known dns servers are arranged on the Internet network, these servers can not break down basically, can be reliable the domain name mapping service is provided.
Whether unobstructed ping be the order that is used for checking network or network connection speed.The principle that it utilized is such: the machine on the network all has well-determined IP address, we send a packet to target ip address, the other side will return an onesize packet, and we can determine whether destination host exists according to the packet that returns.Keep-alive monitoring be the network equipment by regular transmission request message, and receive back message using, confirm a kind of the method whether equipment of adjacency survives.
Ethernet switch (hereinafter to be referred as switch) is a kind of multiport network equipment based on bridge technology commonly used, and it provides the path of low time delay, low expense for the forwarding of Frame from a port to another arbitrary port.Should there be a switching matrix at switch internal core place, for the communication between any two ends mouth provides path, or a quick exchange bus, so that send from other ports by the Frame of arbitrary port reception.Do not move link layer protocol on the port on the switch, can't monitor whether operate as normal of interface by link layer protocol, can only come whether operate as normal of monitoring port by hardware signal as Wide Area Network interface.For example, if one the communication of circuit is that a port A from switch is forwarded to another port B communication, the hardware signal of port A is normal, the hardware of port B breaks down, in this case, this circuit can't normal communication, but port A hardware signal is normal, and the equipment that links to each other with port A thinks that still this circuit can operate as normal from hardware.
The Ethernet that with the switch is nucleus equipment adopts stelliform connection topology configuration mostly, stelliform connection topology configuration be with a node as Centroid, the network that other nodes directly link to each other with Centroid and constitute.The network of stelliform connection topology configuration belongs to centralized control type network, and whole network is carried out centralized access control management by Centroid, and each internodal communication all will be passed through Centroid.Each will send the data dispatching centre node that the node of data all will send, and is responsible for data are delivered to the order ground node by Centroid again.Therefore, Centroid is quite complicated, and the communication process of each node burden is all very little.Stelliform connection topology configuration is simple relatively, is convenient to management, and networking is easy, is a kind of topological structure that present local area network (LAN) generally adopts.
In the existing Ethernet environment, Internet bar's Ethernet for example, usually be connected with Internet by router, in order to ensure the security reliability of network, a main circuit and the spare line used is generally all arranged, main with circuit and the different IP address of spare line employing, the Internet bar is connected to the Internet outlet and indicates with default route usually, default route is pointed to main with circuit and spare line simultaneously, the main route priority height of using the route priority ratio spare line of circuit, the Internet bar is connected to the network of Internet and preferentially selects the main circuit of using as outlet, what be connected to the Internet network is main when can't be connected to the Internet network with circuit, just can switch to spare line.
At present main with all being that Ethernet switch by telecom operators is connected to the Internet network under a lot of situations of circuit.Whether ethernet line is star-like topological structure, is the topological structure of point-to-point unlike the wide area network circuit, can break down by the opposite end that link layer protocol is monitored point-to-point.Therefore on ethernet line, be to have no idea whether to break down, can only monitor self end points by physical signalling and whether break down by other end points that link layer protocol is monitored on the whole star topology.Owing to there is not link layer protocol to guarantee, so so a kind of situation can occur, the circuit of the Ethernet switch of router connection telecom operators is no problem, problem occurred but Ethernet switch connects the circuit of Internet gateway.As shown in Figure 1, the circuit between telecommunications switch and the gateway breaks down, and the telecommunications master who causes network router to link to each other can't be connected to Internet with circuit.
In this case, be no problem all the time because router connects the interface of telecommunications switch, even therefore the cochain of telecommunications switch goes wrong, Internet bar's router can't know that also the telecommunications master is unavailable with circuit, initiatively switches to spare line never.At this moment have only the webmaster personnel of Internet bar to find to connect the Internet network, just the master of router is cut off with circuit, be connected to other circuit (adsl line) of backup.
Therefore, in the prior art, because can't initiatively being checked through the master, Internet bar's router can not be connected to Internet with circuit, may cause to switch to spare line for a long time, and switch to this process need manual intervention of spare line, thereby cause the circuit of this Ethernet interface of long period can't normal communication.
Summary of the invention
The embodiment of the invention provides a kind of link monitoring method and device, breaks down in order to the cochain that solves the switch that links to each other with router ethernet interface in the prior art, and router can't monitor the problem of this fault from hardware.
A kind of link monitoring method, this method comprises:
Use circuit to far-end reliable apparatus transmitting supervisory message by the master, and receive the back message using of far-end reliable apparatus; Described monitoring message is PING request message and DNS message;
If in the predefined time, do not receive the back message using of described far-end reliable apparatus, switch to spare line;
Continue by the main circuit of using to described far-end reliable apparatus transmitting supervisory message;
If receive described back message using, switch to the main circuit of using.
A kind of link monitoring device, this device comprise keep-alive probe unit and interface switch unit, wherein,
Described keep-alive probe unit is used for using circuit to far-end reliable apparatus transmitting supervisory message by the master, and receives the back message using of far-end reliable apparatus; And after switching to spare line, continue by main with circuit to far-end reliable apparatus transmitting supervisory message, and when in the predefined time, receiving the back message using of described far-end reliable apparatus, notify described interface switch unit to switch to the main circuit of using; Described monitoring message is PING request message and DNS message;
Described interface switch unit is used for described keep-alive probe unit, in the predefined time, when not receiving the back message using of described far-end reliable apparatus, switches to spare line; And, switch to the main circuit of using according to the notice of keep-alive probe unit.
A kind of network equipment comprises aforesaid link monitoring device.
A kind of link monitoring system comprises the far-end reliable apparatus and the aforesaid network equipment, wherein,
The described network equipment is used for using circuit to far-end reliable apparatus transmitting supervisory message by the master, and receives the back message using of far-end reliable apparatus; If in the predefined time, do not receive the back message using of far-end reliable apparatus, switch to spare line; And after switching to spare line, continue by the main circuit of using to described far-end reliable apparatus transmitting supervisory message; And receiving the back message using that described far-end reliable apparatus sends, switch to the main circuit of using; Described monitoring message is PING request message and DNS message;
Described far-end reliable apparatus was used to receive the monitoring message of the network equipment, and sends back message using in the predefined time.
The embodiment of the invention uses circuit to far-end reliable apparatus transmitting supervisory message by the network equipment by the master, and receives the back message using of far-end reliable apparatus; If the described network equipment in the predefined time, does not receive the back message using of described far-end reliable apparatus, switch to spare line.The scheme that adopts the embodiment of the invention to provide, even the network equipment master fault occurred with the middle link of far-end reliable apparatus that circuit connects, the network equipment can't perception on hardware, also can be by the means of software, shortest time perceives this link and fault occurred, automatically switch to spare line in the short period, do not need artificial intervention, improved the ability of the network equipment link monitoring.
Description of drawings
Fig. 1 is a link monitoring schematic diagram in the prior art;
Fig. 2 is the main realization principle flow chart of the embodiment of the invention 1;
Fig. 3 is the main realization principle flow chart of the embodiment of the invention 2;
Fig. 4 is the structural representation of embodiment of the invention generator;
Fig. 5 provides the structural representation of system for the embodiment of the invention.
Embodiment
In the scheme of the embodiment of the invention, the network equipment starts the keepalive mechanism that a kind of software timing is surveyed, and regularly surveys with circuit main.If this moment, the master fault that network device hardware can't monitor occurred with circuit; for example; problem has appearred in the circuit that Ethernet switch connects the Internet gateway; owing to started the keepalive mechanism of regularly surveying; the network equipment can detect main unavailable with circuit in the shortest time, can't connect Internet.The network equipment can cut off the main circuit of using with the means of software, starts spare line.So just can be under the situation that does not need manual intervention, reconnect to Internet by the very short time.
The network equipment of embodiment of the invention indication is the network equipment that needs in the network by ethernet access Internet, generally can be router or possess the road switch of function etc. is arranged, for example, the router that uses in the Internet bar, at this moment router is connected with communication network, and by switch and gateway access Internet in the communication network.The remote equipment that need pass through when the far-end reliable apparatus of embodiment of the invention indication is network equipment visit Internet, remote equipment are if fault or break down with being connected of remote equipment, and the network equipment possibly can't monitor out by existing method.The far-end reliable apparatus can be gateway device or dns server etc.
Be explained in detail to the main realization principle of embodiment of the invention technical scheme, embodiment and to the beneficial effect that should be able to reach below in conjunction with each accompanying drawing.
As shown in Figure 2, the main realization principle process of the embodiment of the invention 1 is as follows:
Step 11 uses circuit to far-end reliable apparatus transmitting supervisory message by the master, and receives the back message using of far-end reliable apparatus.
For the fail safe that network connects, the network equipment all can be provided with active and standby two line access Internet usually.Generally, the network equipment is by the main line access Internet that uses.With the router in the Internet bar is example, leads the Ethernet switch that generally is connected to telecom operators with circuit, and switch connects the Internet resource by gateway.Usually the circuit of Internet bar's internal user visit Internet is in proper order: router--telecommunications switch--gateway.
Generally, the network equipment is to far-end reliable apparatus transmitting supervisory message.Here, the network equipment can be according to setting, regularly to far-end reliable apparatus transmitting supervisory message.The far-end reliable apparatus needs to send back message using after receiving the monitoring message.The network equipment can receive the back message using of far-end reliable apparatus.
Step 12 if in the predefined time, does not receive the back message using of far-end reliable apparatus, switches to spare line.
The network equipment can receive the back message using that the far-end reliable apparatus sends in the regular hour after having sent the monitoring message, if can receive the back message using of far-end reliable apparatus in the predefined time, then explanation is main does not have fault with circuit.
If in the predefined time, the network equipment does not receive the back message using of far-end reliable apparatus, illustrate that the link between the network equipment and the far-end reliable apparatus breaks down, that is to say, the master is broken down with circuit, and the network equipment of this moment can't be by main with line access Internet resource.Therefore, the network equipment need disconnect the master and use circuit, switches to spare line, from spare line visit Internet resource.
Preferably, after step 12, that is to say, after the network equipment switches to spare line, still to far-end reliable apparatus transmitting supervisory message, if can receive the back message using of far-end reliable apparatus in the predefined time, then explanation is main recovers with circuit, the network equipment need switch to the main circuit of using again, by the main line access Internet resource of using.
With Internet bar's router is example, as shown in Figure 3.The main realization principle process of the embodiment of the invention 2 is as follows:
(1), the keepalive mechanism surveyed by software timing of router, survey regularly whether this circuit can connect Internet.
(2) if, problem appearred in circuit that this moment, Ethernet switch connected the Internet gateway owing to started the keepalive mechanism of regularly surveying, router can detect main unavailable with circuit in the shortest time, can't connect Internet.The software timing of router detects this circuit can't connect Internet.
(3), router initiatively disconnects being connected with circuit with the telecommunications master.So just can be under the situation that does not need manual intervention, reconnect to Internet by the very short time.
(4), after the telecommunications master of router disconnects with circuit, will automatically switch to the spare line of ADSL, can connect the Internet network again.
The keepalive mechanism that router software is regularly surveyed still can the active probe master be used circuit when spare line is enabled, can connect Internet if find the master with circuit, then cuts off spare line by the means of software again, reconnects to the main circuit of using.
Preferably, among the foregoing description 1 and the embodiment 2, the method that the network equipment (router) is surveyed the software timing detection in the keepalive mechanism to the timing of far-end reliable apparatus (gateway) transmitting supervisory message can be that ping surveys and DNS surveys.
1), ping surveys:
Set the IP of far-end reliable apparatus (gateway) on the network equipment (router), on the circuit (the main circuit of using) that needs are surveyed, regular sends the ping request to far-end reliable apparatus (gateway).Generally, be that the ping that can receive far-end reliable apparatus (gateway) very soon responds.
If in the time of anticipation, the network equipment (router) is not received what the ping of far-end reliable apparatus (gateway) responded, just illustrates that the circuit (the main circuit of using) that needs to survey breaks down, and can cut off the circuit that needs detection, switches to spare line.
The circuit that the network equipment (router) continuation is simultaneously surveyed at needs (the main circuit of using) upward sends ping asks, and responds if receive the ping of far-end reliable apparatus (gateway) again, then cuts off spare line, switches to the circuit (the main circuit of using) that needs detection.
2), DNS surveys:
In some cases, gateway is attacked in order to prevent, can not respond the ping request, at this moment we just can be by being provided with well-known dns server as the far-end reliable apparatus, then, the network equipment (router) regularly sends the DNS request to well-known dns server on the circuit (the main circuit of using) that needs are surveyed.Generally, the network equipment (router) is to receive what DNS responded very soon on the circuit that needs are surveyed.
Respond if receive the DNS of dns server in the predefined time, just illustrate that the circuit (the main circuit of using) that needs to survey breaks down, the network equipment (router) can cut off the circuit (the main circuit of using) that needs detection, switches to spare line.
Simultaneously, the network equipment (router) continues to send the DNS request on the circuit of needs detection, responds if receive the DNS of dns server again, then cuts off spare line, switches to the circuit (the main circuit of using) that needs detection.
Preferably, above-mentioned ping surveys with DNS and surveys mechanism, can use simultaneously, that is to say, we can both enable regularly detecting function of ping, enabled the timing detecting function that DNS surveys the well-known server of DNS again.
Correspondingly, the embodiment of the invention also provides a kind of link monitoring device, and as shown in Figure 4, this device comprises keep-alive probe unit 21 and interface switch unit 22, and is specific as follows:
Keep-alive probe unit 21 is used for using circuit to far-end reliable apparatus transmitting supervisory message by the master, and receives the back message using of far-end reliable apparatus;
Preferably, above-mentioned interface switch unit 22 also is used for when keep-alive probe unit 21 receives the back message using of described far-end reliable apparatus in the predefined time after switching to spare line, then switches to the main circuit of using.
Preferably, the link monitoring device in the foregoing description can be arranged in the network equipment.Far-end reliable apparatus in the foregoing description can be gateway or dns server.
Preferably, as shown in Figure 5, the embodiment of the invention also provides a kind of link monitoring system, comprises the aforesaid network equipment and far-end reliable apparatus, wherein,
The network equipment is used for to far-end reliable apparatus transmitting supervisory message, and receives the back message using of far-end reliable apparatus; If in the predefined time, do not receive the back message using of far-end reliable apparatus, switch to spare line.
The far-end reliable apparatus was used to receive the monitoring message of the network equipment, and sends back message using in the predefined time.
Preferably, the described network equipment continues to described far-end reliable apparatus transmitting supervisory message after switching to spare line, and when receiving the back message using of described far-end reliable apparatus, switches to the main circuit of using.
To sum up, the scheme that adopts the embodiment of the invention to provide, even the network equipment master fault occurred with the middle link of far-end reliable apparatus that circuit connects, the network equipment can't perception on hardware, also can be by the means of software, the shortest time perceives this link and fault occurred, automatically switches to spare line in the short period, do not need artificial intervention, improved the ability of the network equipment link monitoring.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. a link monitoring method is characterized in that, this method comprises:
Use circuit to far-end reliable apparatus transmitting supervisory message by the master, and receive the back message using of far-end reliable apparatus; Described monitoring message is PING request message and DNS message;
If in the predefined time, do not receive the back message using of described far-end reliable apparatus, switch to spare line;
After switching to spare line, continue to send described monitoring message with circuit to described far-end reliable apparatus by main;
If receive described back message using, switch to the main circuit of using.
2. the method for claim 1 is characterized in that, the described master of passing through uses circuit to far-end reliable apparatus transmitting supervisory message, and the back message using of reception far-end reliable apparatus comprises:
By leading with circuit regularly to described far-end reliable apparatus transmitting supervisory message;
Described far-end reliable apparatus sends back message using after receiving described monitoring message in the predefined time.
3. the method for claim 1 is characterized in that, described far-end reliable apparatus is gateway or dns server.
4. a link monitoring device is characterized in that, this device comprises keep-alive probe unit and interface switch unit, wherein,
Described keep-alive probe unit is used for using circuit to far-end reliable apparatus transmitting supervisory message by the master, and receives the back message using of far-end reliable apparatus; And after switching to spare line, continue by main with circuit to far-end reliable apparatus transmitting supervisory message, and when in the predefined time, receiving the back message using of described far-end reliable apparatus, notify described interface switch unit to switch to the main circuit of using; Described monitoring message is PING request message and DNS message;
Described interface switch unit is used for described keep-alive probe unit, in the predefined time, when not receiving the back message using of described far-end reliable apparatus, switches to spare line; And, switch to the main circuit of using according to the notice of keep-alive probe unit.
5. a network equipment is characterized in that, comprises link monitoring device as claimed in claim 4.
6. a link monitoring system is characterized in that, comprises the far-end reliable apparatus and the network equipment as claimed in claim 5, wherein,
The described network equipment is used for using circuit to far-end reliable apparatus transmitting supervisory message by the master, and receives the back message using of far-end reliable apparatus; If in the predefined time, do not receive the back message using of far-end reliable apparatus, switch to spare line; And after switching to spare line, continue by the main circuit of using to described far-end reliable apparatus transmitting supervisory message; And receiving the back message using that described far-end reliable apparatus sends, switch to the main circuit of using; Described monitoring message is PING request message and DNS message;
Described far-end reliable apparatus was used to receive the monitoring message of the network equipment, and sends back message using in the predefined time.
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| CN2008101157368A CN101304346B (en) | 2008-06-27 | 2008-06-27 | Method and apparatus for monitoring link |
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| CN2008101157368A CN101304346B (en) | 2008-06-27 | 2008-06-27 | Method and apparatus for monitoring link |
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| CN101304346A CN101304346A (en) | 2008-11-12 |
| CN101304346B true CN101304346B (en) | 2010-12-15 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101763113B (en) * | 2008-12-25 | 2012-07-25 | 中广核工程有限公司 | Life monitoring system |
| CN101483549B (en) * | 2009-02-13 | 2012-05-23 | 华为技术有限公司 | Protection switching method, apparatus and system |
| CN102026242A (en) * | 2009-09-22 | 2011-04-20 | 中兴通讯股份有限公司 | Multimedia session method and device |
| EP2702748A4 (en) * | 2011-04-29 | 2015-05-20 | Ericsson Telefon Ab L M | Automatic connection selection |
| CN102237929B (en) * | 2011-07-15 | 2015-02-25 | 北京星网锐捷网络技术有限公司 | Equipment switching method, device and system based on fiber communication network |
| CN102833167B (en) * | 2012-08-28 | 2016-01-20 | 瑞斯康达科技发展股份有限公司 | Data transmission method and system between local area network (LAN) |
| CN105871667B (en) * | 2016-03-24 | 2019-07-16 | 上海泓亚通信技术有限公司 | A kind of method for switching network of gateway |
| CN106209619A (en) * | 2016-08-31 | 2016-12-07 | 上海地面通信息网络有限公司 | A kind of real-time automatic switching control equipment being applied to route interruption and method |
| CN108737586B (en) * | 2017-04-20 | 2021-09-28 | 互联网域名系统北京市工程研究中心有限公司 | Disaster recovery switching method and device for domain name query service |
| CN108234219A (en) * | 2018-01-28 | 2018-06-29 | 厦门四信通信科技有限公司 | It is a kind of to realize that three links automatically switch the method for online in router gateway |
| CN109039825B (en) * | 2018-08-30 | 2021-12-21 | 湖北微源卓越科技有限公司 | Network data protection device and method |
| CN113225251A (en) * | 2021-05-31 | 2021-08-06 | 上海寰创通信科技股份有限公司 | Method and system for rapidly switching LTE (Long term evolution) main router and LTE main router |
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| CN1681254A (en) * | 2004-04-08 | 2005-10-12 | 华为技术有限公司 | Maintaining method of Ethernet link state |
| CN1780454A (en) * | 2004-11-17 | 2006-05-31 | 华为技术有限公司 | Method for maintaining and restoring link inspection |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1681254A (en) * | 2004-04-08 | 2005-10-12 | 华为技术有限公司 | Maintaining method of Ethernet link state |
| CN1780454A (en) * | 2004-11-17 | 2006-05-31 | 华为技术有限公司 | Method for maintaining and restoring link inspection |
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