CN101908986A - Method and equipment for detecting link fault - Google Patents
Method and equipment for detecting link fault Download PDFInfo
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- CN101908986A CN101908986A CN 201010250925 CN201010250925A CN101908986A CN 101908986 A CN101908986 A CN 101908986A CN 201010250925 CN201010250925 CN 201010250925 CN 201010250925 A CN201010250925 A CN 201010250925A CN 101908986 A CN101908986 A CN 101908986A
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Abstract
The invention discloses a method and equipment for detecting link fault. The method comprises the following steps that: opposite-terminal equipment receives first detection message from home-terminal equipment, and switches a second Ethernet port to an on state according to the first detection message; the opposite-terminal equipment sends second detection message to the home-terminal equipment, and judges whether the first detection message from the home-terminal equipment can be received in the preset time; if so, the opposite-terminal equipment determines that the link between a first Ethernet port and the second Ethernet port has no fault; otherwise, the opposite-terminal equipment determines that the link between the first Ethernet port and the second Ethernet port has fault. The method and the equipment can accurately detect whether the link has fault.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of detection method and equipment of link failure.
Background technology
Ethernet technology is from being born, and is simple and easy to the dominant technology that usefulness, lower-price characteristic progressively become local area network (LAN) with it.In recent years, along with the sequential use of gigabit Ethernet, ten thousand mbit ethernet technology, ethernet technology is expanded to metropolitan area network and wide area network direction.
Because ethernet technology is mainly used in local area network (LAN) at first, and local area network (LAN) is lower to the requirement of reliability and stability.Therefore, Ethernet OAM (Operation, Administration and Maintenance, Operations, Administration and Maintenance) can effectively improve the ability that administers and maintains of Ethernet, and ensures the stable operation of network.Wherein, the major function of OAM comprises:
(1) link performance monitoring function: the various performances to link are monitored (for example, can monitor packet drop, time delay situation, jitter conditions etc.), and all kinds of flows are added up.
(2) detecting fault and alarm function: by sending the connectedness that probe messages is come detecting link, and when link breaks down timely informing network keeper.
(3) go-and-return test function: the situation of returning by the monitoring message that sends detects link-quality and location link failure.
It should be noted that in actual networking, a kind of special phenomena one way link (being single-pass) can occur.Wherein, one way link is meant that local terminal equipment can receive the message that opposite equip. sends by link layer, but opposite equip. can not receive the message of local terminal equipment.In when, in the actual networking one way link taking place when, will cause a series of problem, for example, there are problems such as loop in the tree topology of generation.Therefore, in actual applications, need avoid the generation of one way link.
Be connected to example with optical fiber, one way link can be divided into two types: a kind of is that the optical fiber intersection links to each other, and another kind is that an optical fiber does not connect or an optical fiber opens circuit.Shown in Figure 1A-1C, be the optical fiber connection diagram.Wherein, Figure 1A is correct optical fiber connection diagram, and Figure 1B is that optical fiber intersects to link to each other and causes occurring the schematic diagram of one way link, and Fig. 1 C is that optical fiber does not connect or optical fiber opens circuit and causes occurring the schematic diagram of one way link.
Generation for fear of one way link, need the equipment of link both sides be detected, and detection mode is to keep and overtime testing mechanism by the health status of appointed interval, under normal circumstances promptly, the equipment of link both sides is sent out the health status probe messages mutually, connects and can reach if can receive response then think, behind the continuous else if several times interval, still can't receive response, then think the connection fault.
But, in actual applications, can not guarantee the equal open detection agreement of equipment of link both sides, suppose to have only a side open detection agreement and opposite side does not have the open detection agreement, then for the equipment of open detection agreement, still can't receive the situation of response behind the continuous several times of the meeting appearance interval, at this moment, the equipment of open detection agreement can be thought the connection fault, and being opposite side equipment, actual conditions do not have the open detection agreement, connect not fault, thereby cause detecting the generation of wrong report link failure.
Summary of the invention
The invention provides a kind of detection method and equipment of link failure, whether break down accurately to detect link, and avoid reporting by mistake the situation of link failure.
In order to achieve the above object, the present invention proposes a kind of detection method of link failure, be applied to comprise in the system of local terminal equipment and opposite equip., described local terminal equipment is connected with second ethernet port of described opposite equip. by first ethernet port, the described second ethernet port initial condition is the self adaptation state, and this method may further comprise the steps:
When first ethernet port of described local terminal equipment started link detecting, described opposite equip. received first probe messages from described local terminal equipment; And described second ethernet port is switched to opening from described self adaptation state according to described first probe messages;
Described opposite equip. sends second probe messages to described local terminal equipment, and judges first probe messages that whether can receive in the Preset Time from described local terminal equipment;
If described opposite equip. determines that the link between described first ethernet port and described second ethernet port does not break down; Otherwise described opposite equip. determines that the link between described first ethernet port and described second ethernet port breaks down.
Described opposite equip. determines that the link between described first ethernet port and described second ethernet port breaks down, and also comprises afterwards:
Described opposite equip. reports the information that link breaks down.
According to described first probe messages described second ethernet port is switched to opening from described self adaptation state, also comprises afterwards:
Described opposite equip. is kept described second ethernet port and is in opening, and when described second ethernet port is unusual, described second ethernet port is switched to the self adaptation state from opening.
Described second ethernet port is specially unusually: described second ethernet port is closed, deletes, extracts or described opposite equip. is restarted.
The ethernet port that is in the self adaptation state does not initiatively send probe messages, and when receiving probe messages, the ethernet port that is in the self adaptation state can automatically switch into opening.
A kind of opposite equip. of link failure, be applied to comprise in the system of opposite equip. and local terminal equipment, described local terminal equipment is connected with second ethernet port of described opposite equip. by first ethernet port, described checkout equipment is the self adaptation state as described opposite equip. and the described second ethernet port initial condition, and this equipment comprises:
Receiver module is used for receiving first probe messages from described local terminal equipment when first ethernet port of described local terminal equipment starts link detecting;
Handover module is connected with described receiver module, is used for according to described first probe messages described second ethernet port being switched to opening from described self adaptation state;
Sending module is connected with described handover module, is used for sending second probe messages to described local terminal equipment;
Judge module is connected with described receiver module, is used to judge first probe messages that whether can receive in the Preset Time from described local terminal equipment;
Determination module is connected with described judge module, be used for when the judged result of described judge module when being, determine that the link between described first ethernet port and described second ethernet port does not break down; Otherwise, determine that the link between described first ethernet port and described second ethernet port breaks down.
Also comprise:
Reporting module is connected with described determination module, is used for the information that link breaks down is reported.
Described handover module also is used to keep described second ethernet port and is in opening, and when described second ethernet port is unusual, described second ethernet port is switched to the self adaptation state from opening.
Described second ethernet port is specially unusually: described second ethernet port is closed, deletes, extracts or described opposite equip. is restarted.
The ethernet port that is in the self adaptation state does not initiatively send probe messages, and when receiving probe messages, the ethernet port that is in the self adaptation state can automatically switch into opening.
Compared with prior art, the present invention has the following advantages:
Can accurately detect link and whether break down, and avoid reporting by mistake the situation of link failure, thus the ease for use and the reliability of lifting detection protocol.
Description of drawings
Figure 1A-1C is an optical fiber connection diagram in the prior art;
Fig. 2 is the detection method flow chart of a kind of link failure of the present invention's proposition;
Fig. 3 switches schematic diagram for the state machine of the port of self adaptation state among the present invention;
Fig. 4 is application scenarios schematic diagram among the present invention;
Fig. 5 is the detection method flow chart of the following a kind of link failure that is proposed of a kind of application scenarios of the present invention;
Fig. 6 is the assay device structures figure of a kind of link failure of the present invention's proposition.
Embodiment
For fear of the generation of one way link, need the equipment of link both sides be detected, wherein, detection protocol includes but not limited to: OAM, DLDP (Device Link Detection Protocol, device link detection protocol).
Concrete, DLDP can monitor the Link State of optical fiber or copper twisted pair, exists if find one way link, and then DLDP can dispose according to the user, closes automatically or notifies the user to close related port by hand, to prevent the generation of network problem.
In addition, DLDP is a link layer protocol, can come the Link State of watch-dog with the physical layer protocol collaborative work.Wherein, the Automatic Negotiation Mechanism of physical layer can be carried out the detection of physical signalling and fault, DLDP can carry out opposite equip. identification, one way link identification and close work such as unreachable port.The two is by collaborative work, can detect and close physics and the unidirectional of logic is connected, if both link ends can both independent operate as normal in physical layer, then DLDP can detect whether these links correctly connect, whether two ends can be correct mutual message etc. at link layer.
OAM detection mode and DLDP detection mode are Link State detection protocol commonly used in the Ethernet, be used to detect the accessibility of connection, in testing process, the equipment that requires the link both sides start the Link State detection protocol on the overall situation and/or the port simultaneously and connect after can detect.Suppose that a side starts the Link State detection protocol, opposite side is not activated the Link State detection protocol, then can cause detecting the generation of wrong report link failure.
At the problems referred to above, a kind of detection method and equipment of link failure are provided among the present invention, by the self adaptation state is set, start the Link State detection protocol in a side, opposite side is not activated under the situation of Link State detection protocol, also can accurately detect link and whether break down, and avoid reporting by mistake the situation of link failure.
As shown in Figure 2, a kind of detection method of link failure is provided among the present invention, be applied to comprise in the system of local terminal equipment and opposite equip., described local terminal equipment is connected with second ethernet port of described opposite equip. by first ethernet port, the described second ethernet port initial condition is the self adaptation state, and this method may further comprise the steps:
In order more clearly to set forth technical scheme provided by the invention, describe the present invention below in conjunction with a kind of concrete application scenarios.
Should be with under the scene, need the default switch state of the agreement of Equipment Inspection earlier to be set to: global default is opened, the default self adaptation of port; And the detection protocol default setting of port is set to: the self adaptation state.
Concrete, after the setting that global default is opened is to guarantee that all probe messages can arrive this equipment, is delivered to detection module (for example, CPU etc.) on correct and handled.When the detection protocol of port is the self adaptation state, this port does not initiatively send probe messages, but when receiving probe messages, this port can automatically switch into opening, connect with opposite equip. and carry out the transmission and the reception of probe messages, keep health status.
In addition, in setting up procedure, when the port of self adaptation state owing to receiving after probe messages switches to opening, the state of this port will maintain opening, until port is closed, deletes, extracts or equipment situation such as is restarted and taken place.
It should be noted that when the port of self adaptation state owing to receiving after probe messages switches to opening, the message of port transmission that the message that the port of this self adaptation state sends and user are configured to opening is identical.The port that is the self adaptation state is owing to receiving after probe messages switches to opening, and what the port of this self adaptation state will be with the port that is configured to opening is identical.For example, after the port of self adaptation state switches to opening, the port of self adaptation state also can send probe messages to opposite equip., if opposite equip. is in the self adaptation state, then can make opposite equip. according to this probe messages the self adaptation state be switched to opening.Again for example, after the port of self adaptation state switches to opening, if can't receive back message using after surpassing designated time intervals, then with the reporting links fault.
As shown in Figure 3, for the state machine of the port of self adaptation state switches schematic diagram, initialization (START) afterwards, port will be in self adaptation state (AUTO), by intercepting the information of (listen) opposite equip., when the probe messages that receives from opposite equip., port switches to opening (ON), under opening, if port is closed, deletes, extracts or equipment is restarted etc., then port switches to the self adaptation state.
Application scenarios schematic diagram of the present invention as shown in Figure 4, detecting with the Link State of switch A and switch b is that example describes, and is example (mode that detects by DLDP is similar, repeats no more among the present invention) to detect by OAM.Wherein, switch A is a local terminal equipment, and port (first ethernet port) is G1/0/1, and switch b is an opposite equip., and port (second ethernet port) is G2/0/1, and switch A and switch b are direct-connected by two Ethernet interfaces.
Should be with under the scene, the detection protocol default setting of the port G2/0/1 of switch b is the self adaptation state, the detection protocol default setting of the port G1/0/1 of switch A can be the self adaptation state, also can be closed condition, be that the self adaptation state is that example describes with the detection protocol default setting of the port G2/0/1 of the port G1/0/1 of switch A and switch b.Under initial condition, switch A and switch b are not opened the OAM agreement, are operated in the self adaptation state.
As shown in Figure 5, the detection method of link failure provided by the invention may further comprise the steps:
Step 501 is opened the OAM protocol function on the port G1/0/1 of switch A, make port G1/0/1 be in opening.
Concrete, need be concerned about the connection status of port G1/0/1 respective links when switch A, and when carrying out relevant treatment according to this connection status, then the webmaster personnel can open the OAM protocol function by configuration tool on the port G1/0/1 of switch A, make port G1/0/1 be in opening.
Concrete, switch A can outwards send OAM discovery message according to preset period or the port G1/0/1 that passes through regularly, whether there to be OAM equipment in the detection network, owing to should be corresponding OAM equipment with switch b under the scene, then switch b can return corresponding results to switch A, and switch A finds that switch b is an OAM equipment.
Wherein, this probe messages is the probe messages based on the OAM agreement.For convenience of description, this probe messages is an example with first probe messages.
Concrete, after finding switch b, because port G1/0/1 has started OAM link detecting function, if whether switch A needs the link between detection port G1/0/1 and the port G2/0/1 normal, then switch A need send first probe messages to the port G2/0/1 of switch b by port G1/0/1.
Because when port is the self adaptation state, this port does not initiatively send probe messages, but when receiving probe messages, this port can automatically switch into opening, and connect with opposite equip. and carry out the transmission and the reception of probe messages, keep health status.
Therefore, after receiving first probe messages, switch b need switch to opening from the self adaptation state with the OAM(Operation Administration Maintenance) setting of port G2/0/1.In addition, after receiving first probe messages, switch b can also send response message to switch A by port G2/0/1.
Concrete, switch b need send second probe messages to the port G1/0/1 of switch A by port G2/0/1.
Concrete, after switch b and switch A are all opened the OAM protocol function, switch b and switch A all need to send probe messages according to preset period to the opposite end, be that switch A sends first probe messages according to preset period (cycle 1) to switch b, switch b sends second probe messages according to preset period (cycle 2) to switch A, wherein, the cycle 1 can be identical with the cycle 2, also can be different.
In this step, this Preset Time can be selected according to actual needs, for example, switch A according to the cycle 1 when switch b sends first probe messages, this Preset Time can be cycle 1 time corresponding of preset times.
It should be noted that switch A also can judge second probe messages that whether receives switch b in the Preset Time, and handle accordingly that the processing procedure of this processing procedure and switch b is similar, should repeat no more with under the scene according to judged result.
In addition, switch b can also be judged the response message that whether receives switch A in the Preset Time, if forward step 508 to; Otherwise, forward step 509 to.Wherein, in actual applications, after second probe messages that receives from switch b, this switch A can also if receive this response message in the switch b Preset Time, forward step 508 to the response message of switch b transmission at second probe messages, otherwise, forward step 509 to.
When the link between port G2/0/1 and the port G1/0/1 did not break down, switch b was kept port G2/0/1 and is in opening, connected with opposite equip. and carried out the transmission and the reception of probe messages, kept health status etc.
Concrete, if the link between port G2/0/1 and the port G1/0/1 breaks down, then switch b need report OAM link failure incident to port G2/0/1, the OAM protocol status of keeping port G2/0/1 simultaneously is an opening, and waits for that Link State recovers.
It should be noted that, switch A is after switch b sends first probe messages, switch A also needs to judge second probe messages that whether receives in the Preset Time from switch b, and determine according to judged result whether the link between port G2/0/1 and the port G1/0/1 breaks down, the processing procedure type of this process and switch b should repeat no more with under the scene.
Concrete, after Link State recovers, no matter the OAM protocol status of the port G1/0/1 of switch A is opening or self adaptation state, switch b all can send second probe messages to switch A by port G2/0/1, with the Link State between detection port G1/0/1 and the port G2/0/1, if port G1/0/1 is in opening, then direct and port G2/0/1 connects and enters testing process; If port G1/0/1 is in the self adaptation state, then switch A need switch to opening from the self adaptation state with port G1/0/1, and the subsequent treatment mode of this switch A and the processing mode of switch b are similar, should be with giving unnecessary details no longer in detail under the scene.
It should be noted that after port G2/0/1 is in opening switch b need be kept port G2/0/1 and be in opening, and occur port G2/0/1 being switched to the self adaptation state from opening when unusual at port G2/0/1.Wherein, the unusual situation of port G2/0/1 appearance includes but not limited to: port G2/0/1 is closed, port G2/0/1 is deleted, port G2/0/1 is pulled out or the switch b of port G2/0/1 correspondence is restarted.
Further, when the OAM of port G2/0/1 protocol status reverts to the self adaptation state, if the OAM protocol status of port G1/0/1 still is in opening, then switch A can send probe messages (first probe messages) to switch b by port G1/0/1, by switch b port G2/0/1 is switched to opening from the self adaptation state.If the OAM protocol status of port G1/0/1 is in closed condition or self adaptation state, then switch b need be kept port G2/0/1 at the self adaptation state.
Based on the inventive concept same with said method, the invention allows for a kind of checkout equipment of link failure, be applied to comprise in the system of described opposite equip. and local terminal equipment, described local terminal equipment is connected with second ethernet port of described opposite equip. by first ethernet port, described checkout equipment is the self adaptation state as described opposite equip. and the described second ethernet port initial condition, wherein, the ethernet port that is in the self adaptation state does not initiatively send probe messages, when receiving probe messages, the ethernet port that is in the self adaptation state can automatically switch into opening.As shown in Figure 6, this equipment comprises:
Described handover module 62 also is used to keep described second ethernet port and is in opening, and when described second ethernet port is unusual, described second ethernet port is switched to the self adaptation state from opening; Wherein, described second ethernet port is specially unusually: described second ethernet port is closed, deletes, extracts or described opposite equip. is restarted.
Sending module 63 is connected with described handover module 62, is used for sending second probe messages to described local terminal equipment.
Wherein, each module of apparatus of the present invention can be integrated in one, and also can separate deployment.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above sequence number is not represented the quality of embodiment just to description.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1. the detection method of a link failure, be applied to comprise in the system of local terminal equipment and opposite equip., described local terminal equipment is connected with second ethernet port of described opposite equip. by first ethernet port, it is characterized in that, the described second ethernet port initial condition is the self adaptation state, and this method may further comprise the steps:
When first ethernet port of described local terminal equipment started link detecting, described opposite equip. received first probe messages from described local terminal equipment; And described second ethernet port is switched to opening from described self adaptation state according to described first probe messages;
Described opposite equip. sends second probe messages to described local terminal equipment, and judges first probe messages that whether can receive in the Preset Time from described local terminal equipment;
If described opposite equip. determines that the link between described first ethernet port and described second ethernet port does not break down; Otherwise described opposite equip. determines that the link between described first ethernet port and described second ethernet port breaks down.
2. the method for claim 1 is characterized in that, described opposite equip. determines that the link between described first ethernet port and described second ethernet port breaks down, and also comprises afterwards:
Described opposite equip. reports the information that link breaks down.
3. the method for claim 1 is characterized in that, according to described first probe messages described second ethernet port is switched to opening from described self adaptation state, also comprises afterwards:
Described opposite equip. is kept described second ethernet port and is in opening, and when described second ethernet port is unusual, described second ethernet port is switched to the self adaptation state from opening.
4. method as claimed in claim 3 is characterized in that, described second ethernet port is specially unusually: described second ethernet port is closed, deletes, extracts or described opposite equip. is restarted.
5. as each described method of claim 1-4, it is characterized in that the ethernet port that is in the self adaptation state does not initiatively send probe messages, when receiving probe messages, the ethernet port that is in the self adaptation state can automatically switch into opening.
6. the checkout equipment of a link failure, be applied to comprise in the system of opposite equip. and local terminal equipment, described local terminal equipment is connected with second ethernet port of described opposite equip. by first ethernet port, it is characterized in that, described checkout equipment is the self adaptation state as described opposite equip. and the described second ethernet port initial condition, and this equipment comprises:
Receiver module is used for receiving first probe messages from described local terminal equipment when first ethernet port of described local terminal equipment starts link detecting;
Handover module is connected with described receiver module, is used for according to described first probe messages described second ethernet port being switched to opening from described self adaptation state;
Sending module is connected with described handover module, is used for sending second probe messages to described local terminal equipment;
Judge module is connected with described receiver module, is used to judge first probe messages that whether can receive in the Preset Time from described local terminal equipment;
Determination module is connected with described judge module, be used for when the judged result of described judge module when being, determine that the link between described first ethernet port and described second ethernet port does not break down; Otherwise, determine that the link between described first ethernet port and described second ethernet port breaks down.
7. equipment as claimed in claim 6 is characterized in that, also comprises:
Reporting module is connected with described determination module, is used for the information that link breaks down is reported.
8. equipment as claimed in claim 6 is characterized in that,
Described handover module also is used to keep described second ethernet port and is in opening, and when described second ethernet port is unusual, described second ethernet port is switched to the self adaptation state from opening.
9. equipment as claimed in claim 8 is characterized in that, described second ethernet port is specially unusually: described second ethernet port is closed, deletes, extracts or described opposite equip. is restarted.
10. as each described equipment of claim 6-9, it is characterized in that the ethernet port that is in the self adaptation state does not initiatively send probe messages, when receiving probe messages, the ethernet port that is in the self adaptation state can automatically switch into opening.
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