CN101056223A - Link failure detection method and device - Google Patents
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- CN101056223A CN101056223A CNA2007100997941A CN200710099794A CN101056223A CN 101056223 A CN101056223 A CN 101056223A CN A2007100997941 A CNA2007100997941 A CN A2007100997941A CN 200710099794 A CN200710099794 A CN 200710099794A CN 101056223 A CN101056223 A CN 101056223A
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Abstract
The invention discloses a link fault detection method, including: create an MEP on each aggregation link in advance; then, any one port of each aggregation link receives the CFM message from the remote MEP or MIP, send this message to this aggregation link to create the MEP, the MEP may determine the link fault detection results between itself equipment and remote MEP or MIP equipment according to all the received all CFM message, the invention still discloses a link fault detection device, including: aggregation port receiving and sending module and MEP module. The invention may create a MEP on each aggregation link, ensure this MEP to detect all CFM message such as CCM or LBR or LTR message received by the whole aggregation link, thus improves the fault detection accuracy for end to end link of the aggregation link located.
Description
Technical field
The present invention relates to the fault detection technique field, be specifically related to a kind of link failure detection method and device.
Background technology
Ethernet technology is in the success in local area network (LAN) field, with and dispose simple, safeguard simple advantage, impel service provider, equipment manufacturers and standardization body that ethernet technology is advanced to metropolitan area network and wide area network field.But ethernet technology enters the major obstacle that the operator field faces lacks effective maintenance and management instrument exactly, so connected trouble management (CFM, Connectivity Fault Management) is arisen at the historic moment.
CFM provides detection of connectivity end to end, and mainly two layers of interconnect services that operator is provided are carried out the link monitoring and the fault detect of layering, mainly comprise three kinds of functions:
1, communication with detection (CC, Connectivity Check) function.Safeguard collection boundary point (MEP, Maintenance association End Point) periodically sends communication with detection message (CCM, Connectivity Check Message) message, all and this MEP belong to same maintenance field (MD, Maintenance Domain) and safeguard collection (MA, Maintenance Association) far-end MEP can receive this CCM message under the situation that link is communicated with, if far-end MEP does not receive the CCM message that certain MEP sends in continuous three cycles, then think and this MEP between link fault may appear.
2, loopback (LB, Loop Back) function promptly: the function of two layers of Ping.MEP is to far-end MEP or safeguard the intermediate point (MIP that collects, Maintenance domain Intermediate Point) sends loopback message (LBM, Loop Back Message) message, and wait for that the loopback that far-end MEP or MIP return responds (LBR, Loop Back Reply) message if receive the LBR message, thinks that then link is normal, otherwise, think link failure to have occurred.
3, link trace (LT, Link Trace) function.MEP sends link trace message (LTM to far-end MEP, Link Trace Message) message, and the link trace response (LTR that returns of the MIP on the wait intermediate path and far-end MEP, Link Trace Reply) message, according to the LTR message of being received, the definite position that MEP just can fault location takes place.
Also can detect various link defectives by CC function CF M, comprise: defectives such as CCM message dropping, CCM message mistake, CCM message intersection.By CFM rich functions and perfect link failure management, can satisfy the maintenance needs of ethernet technology in metropolitan area network and wan environment well.
Fig. 1 has provided the schematic diagram of using CFM under typical scene, as shown in Figure 1, this application scenarios is divided into three territories: user domain, service provider territory, operation domain, different levels are adhered in three territories separately, by territory scope under the positioning equipment, reasonable disposition MEP, MIP just can realize the connected trouble management of link.
Link aggregation is a plurality of physics ethernet ports to be condensed together form a link in logic, many the physical links that the upper layer entity of use link aggregation service will condense together are considered as a logical links, as long as there is a physical link to be communicated with, the logical links of this polymerization just is communicated with, and need not to be concerned about whether inner all physical links of aggregated links all are communicated with.Link aggregation can realize out/goes into load between each member port of polymerization, to share, to increase bandwidth, can also realize between each member port of polymerization dynamic backup each other, and improved connection reliability.
Link aggregation often is applied on the capital equipment of convergence-level, core layer in general networking, perhaps is applied on core layer and the equipment that convergence-level is connected, realizing the redundancy backup of link, and increases bandwidth.In networking, can use CFM carries out layering to two layers of interconnect services of Ethernet link monitoring and fault detect with link aggregation.Can realize that by the CC function connectivity of link detects and the link failure management end to end, carry out fault recognition and fault location by LB and LT function.But, at present in the networking of application link polymerization, can only on each member port of aggregated links, create the MEP of a CFM respectively, whether the end-to-end link that the MEP on each member port can only detect the physical link that comprises this MEP place is communicated with, and can't detect the connection situation of the end-to-end link of other physical link that comprises this aggregated links, thereby can't make accurate judgement to the connection of the link end to end situation that is deployed with aggregated links.
Fig. 2 has provided the existing schematic diagram of using CFM on aggregated links, as shown in Figure 2, suppose to want the connection situation of the link between checkout equipment A and the B, wherein, equipment C and D are between device A and B, and the link between equipment D and the equipment B is: a logical links that is polymerized by physical link link1, link2, link3, and disposed MEP2, MEP3 respectively on the polymerization member port 2,3 of the equipment B at link2, link3 place.Then, MEP2 can according to MEP1 between the CCM message that exchanges determine whether the device A and the link between the B that comprise link2 are communicated with, MEP3 then can according to MEP1 between the CCM message that exchanges determine whether the device A and the link between the B that comprise link3 are communicated with, whether be communicated with but MEP2 and MEP3 can't learn the device A and the link between the B that comprise link1.For example: if the CCM message that the MEP1 of slave unit A sends is always delivered to equipment B from the link1 of aggregated links, MEP2 and MEP3 will think always and do not receive CCM message from MEP1 so, thereby may think link2, link3 link failure.Therefore, if a fault detect result according to MEP2, MEP3 judges whether the end-to-end link at aggregated links place is communicated with, and then may do the judgement that makes mistake, and has reduced the accuracy to the fault detect of aggregated links place end-to-end link.
Summary of the invention
The invention provides a kind of link failure detection method and device, with the accuracy of raising to the fault detect of the end-to-end link at aggregated links place.
Technical scheme of the present invention is achieved in that
A kind of link failure detection method is created a MEP in advance on each aggregated links, this method comprises:
Any one port of each aggregated links is received the link-state information that far-end MEP or MIP send, this link-state information is sent to the MEP that on this aggregated links, creates, described MEP is according to all link-state informations that receive, and determines the testing result of the link failure between self place equipment and far-end MEP or the MIP place equipment.
Describedly creating a MEP on each aggregated links be: create a MEP on the polymerization logic interface in each aggregated links.
Describedly creating a MEP on each aggregated links be: create a MEP on the master port in each aggregated links.
Described link-state information is: the CCM message,
Described MEP determines that the testing result of the link failure between self place equipment and the far-end MEP place equipment comprises: described MEP determines in continuous three cycles the CCM message that any port of self place aggregated links does not all report far-end MEP to send, and determines that then the link between self place equipment and this far-end MEP place equipment breaks down.
Described link-state information is: the LBR message,
Describedly on each aggregated links, create after the MEP, any one port of each aggregated links further comprises before receiving the link-state information that far-end MEP or MIP send: the described MEP that creates on aggregated links selects any one port of self place aggregated links that the LBM message is sent to MIP or far-end MEP
Described MEP determines that the testing result of the link failure between self place equipment and far-end MEP or the MIP place equipment comprises: described MEP does not receive the LBR message that described MIP that any port of self place aggregated links reports or far-end MEP return in scheduled duration, then determine the link occurs fault with this MIP or far-end MEP place equipment room.
Described link-state information is: the LTR message,
Describedly on each aggregated links, create after the MEP, any one port of each aggregated links further comprises before receiving the link-state information that far-end MEP or MIP send: the described MEP that creates on aggregated links selects any one port of self place aggregated links that the LTM message is sent to far-end MEP
Described MEP determines that the testing result of the link failure between self place equipment and far-end MEP or the MIP place equipment comprises: described MEP is according to the link trace response LTR message that all of the port of self place aggregated links reports, and locatees the position of the link failure generation between self place equipment and far-end MEP or the MIP place equipment.
A kind of link failure detection device comprises:
The aggregation port transceiver module receives the link-state information that any one port of self place aggregated links or far-end MEP or MIP send, and this message is sent to the MEP module of creating on self place aggregated links;
The MEP module receives the link-state information that the aggregation port transceiver module is sent, and according to paid-in all link-state informations, determines the testing result of the link failure between self place equipment and far-end MEP or the MIP place equipment.
Described device further comprises: non-polymeric port transceiver module, receive the link-state information that far-end MEP or MIP send, and this link-state information is sent to aggregation port transceiver module on self place aggregated links.
Described aggregation port transceiver module and MEP module are positioned on the polymerization logic interface of aggregated links simultaneously, perhaps are positioned at simultaneously on the master port of aggregated links.
Described non-polymeric port transceiver module is positioned on the member port of the aggregated links with polymerization logic interface, perhaps is positioned on the non-master port of the aggregated links with master port.
Compared with prior art, the present invention is by creating a MEP respectively on each aggregated links, make all CFM association message that MEP on each aggregated links can receive this aggregated links as: CCM or LBR or LTR message detect, thereby have improved the accuracy to the fault detect of the end-to-end link at aggregated links place.
Description of drawings
Fig. 1 is a schematic diagram of using CFM under typical scene;
Fig. 2 is the existing schematic diagram of using CFM on aggregated links;
The flow chart that the end-to-end link at aggregated links place is carried out fault detect that Fig. 3 provides for the embodiment of the invention;
Fig. 4 is for using the schematic diagram of instantiation of the present invention;
The device composition diagram that the end-to-end link to the aggregated links place that Fig. 5 provides for the embodiment of the invention carries out fault detect.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The flow chart that the end-to-end link at aggregated links place is carried out fault detect that Fig. 3 provides for the embodiment of the invention, as shown in Figure 3, its concrete steps are as follows:
Step 301: on each aggregated links, create a MEP respectively, for each MEP specifies MD and MA.
Particularly, if aggregated links has a polymerization logic interface, then this MEP is configured on this polymerization logic interface; If aggregated links does not have the polymerization logic interface, but aggregated links has a master port, then this MEP is configured on this master port, for example: member port 1,2,3 place physical links constitute an aggregated links, and member port 2 is a master port, then this MEP is configured on the port 2.
MEP comprises two types: the MEP of introversive (Up) type and the MEP of extroversion (Down) type.If the MEP of a port correspondence is the MEP of Up type, then this port send the CFM association message as: when CFM message or LBM message or LBR message or LTM message or LTR message, this message can at first be transmitted to another one or a plurality of port of equipment by the inside forwarding mechanism of port place equipment, by this another one or a plurality of port message is sent to far-end MEP or MIP then; If the MEP of a port correspondence is the MEP of Down type, when then this port sends the CFM association message, just needn't passes through the inside forwarding mechanism of equipment, but directly message be sent to far-end MEP or MIP by this port.
Step 302: the MEP that is created on the aggregated links determines to send the CFM association message, then this message is sent to MIP or far-end MEP, and this message carries MD sign and the MA sign under this MEP.
If MEP is the MEP of Down type, then MEP selects a member port arbitrarily in the available member port of aggregated links, and MEP sends to this member port with this message then, by this member port this message is sent.
If MEP is the MEP of Up type, then MEP at first sends to this message the forwarding module of device interior, forwarding module is according to the inside forwarding mechanism of self, on the selection equipment, comprise another one or a plurality of port the port except that aggregated links, this message is sent to selected this another one or a plurality of port, this message is sent by this another one or a plurality of port.
Step 303: any one member port of aggregated links is received the CFM association message, all this message is sent to the MEP that creates on this aggregated links.
The CFM association message that step 304:MEP sends according to all of the port of self place aggregated links is determined the link failure between self place equipment and the far-end MEP place equipment.
When aggregated links had the polymerization logic interface, all of the port of the aggregated links of mentioning in this step not only comprised each member port of aggregated links, also comprised this polymerization logic interface.For example: if MEP is the MEP of Up type, and be created on the polymerization logic interface of aggregated links, then MEP not only can receive the CFM association message that all member ports of aggregated links are sent, and can receive that also other port of equipment directly issues the CFM association message of polymerization logic interface by inner forwarding mechanism.
In this step, MEP determines that according to the CFM association message process of link failure is same as the prior art.For example:, think that then the link between self place equipment and this far-end MEP place equipment breaks down if MEP determines any one port in continuous three CCM aggregated links in the cycle not to self reporting the CCM message of sending with certain the far-end MEP that self belongs to same MD and MA.
Perhaps, if MEP is to having sent the LBM message with MIP that self belongs to same MD and MA or far-end MEP, but do not receive the LBR message that this MIP or far-end MEP return, then MEP determines that the link between self place equipment and this MIP or the far-end MEP place equipment breaks down.
Perhaps, if MEP is to sending the LTM message with the far-end MEP that self belongs to same MD and MA, the MEP LTR message that can report then, the particular location that fault location takes place according to all of the port of aggregated links.As: if MEP1 sends the LTM message to MEP2, receive the LTR message that each port of aggregated links reports afterwards, the source address information of carrying according to this message, MEP1 can learn which MIP or MEP2 do not return the LTR message, thereby can determine the particular location of the link occurs fault between self place equipment and the far-end MEP place equipment.
Below provide one and use object lesson of the present invention:
As shown in Figure 4, suppose to want the link between checkout equipment A and the equipment B to be communicated with situation, wherein, equipment C and D are between device A and B, and the link between equipment B and the equipment D is: by three aggregated links that physical link link1, link2, link3 form at 1,2,3 places of the member port on the equipment B, and member port 2 is the master port of this aggregated links; Be located at and create a MEP1 on certain port of device A, on the member port 2 of equipment B, create a MEP2.MEP1 periodically sends the CCM message to MEP2, and MEP2 periodically sends the CCM message to MEP1 simultaneously, with the link failure between monitoring equipment A and the B.For example: suppose that MEP2 is the Down type, then when MEP2 will be when MEP1 sends the CCM message, MEP2 selects a port in member port 1～3, by this member port this message is sent, as shown in Figure 4, can send by the link3 at member port 3 places.Member port 1,3 all can send to this message the MEP2 on the master port 2 after receiving the CCM message that MEP1 sends, if MEP2 does not receive the CCM message that MEP1 sends in continuous three cycles, then can determine the link occurs fault between device A and the equipment B.
The device composition diagram of the detection link failure that Fig. 5 provides for the embodiment of the invention, as shown in Figure 5, it mainly comprises: aggregation port transceiver module 51, MEP module 52 and non-polymeric port transceiver module 53, wherein:
Aggregation port transceiver module 51: receive the CFM association message that MEP module 52 is sent, if MEP is the MEP of Down type, then in all available member port of self place aggregated links, select a member port arbitrarily, this CFM association message is sent to the non-polymeric port transceiver module 53 of the port of this selection, if MEP is the MEP of Up type, then this CFM association message is sent to the forwarding module of self place equipment; Receive the CFM association message that the non-polymeric port transceiver module 53 of any one member port of self place aggregated links or far-end MEP or MIP send, this message is sent to MEP module 52.
If optional member port is self port in all available member port of aggregated links, then directly this CFM association message is sent to far-end MEP or MIP.
MEP module 52: receive the CFM association message that aggregation port transceiver module 51 is sent,, determine the testing result of the link failure between self place equipment and the far-end MEP place equipment according to paid-in all CFM association message; Determine to send the CFM association message, this message is sent to aggregation port transceiver module 51.
Non-polymeric port transceiver module 53: receive the CFM association message that far-end MEP or MIP send, this message is sent to aggregation port transceiver module 51; Receive the CFM association message that aggregation port transceiver module 51 is sent, this message is sent to far-end MEP or MIP.
Wherein, aggregation port transceiver module 51 and MEP module 52 are positioned on the polymerization logic interface or master port of aggregated links simultaneously; Non-polymeric port transceiver module 53 is positioned on the member port of the aggregated links with polymerization logic interface, perhaps is positioned on the non-master port of the aggregated links with master port.
The above only is process of the present invention and method embodiment, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of link failure detection method is characterized in that, creates one in advance and safeguard collection boundary point MEP on each aggregated links, and this method comprises:
Any one port of each aggregated links is received far-end MEP or is safeguarded the link-state information that collection intermediate point MIP sends, this link-state information is sent to the MEP that on this aggregated links, creates, described MEP is according to all link-state informations that receive, and determines the testing result of the link failure between self place equipment and far-end MEP or the MIP place equipment.
2, the method for claim 1 is characterized in that,
Describedly creating a MEP on each aggregated links be: create a MEP on the polymerization logic interface in each aggregated links.
3, the method for claim 1 is characterized in that,
Describedly creating a MEP on each aggregated links be: create a MEP on the master port in each aggregated links.
4, the method for claim 1 is characterized in that, described link-state information is: communication with detection message CCM message,
Described MEP determines that the testing result of the link failure between self place equipment and the far-end MEP place equipment comprises: described MEP determines in continuous three cycles the CCM message that any port of self place aggregated links does not all report far-end MEP to send, and determines that then the link between self place equipment and this far-end MEP place equipment breaks down.
5, the method for claim 1 is characterized in that, described link-state information is: loopback response LBR message,
Describedly on each aggregated links, create after the MEP, any one port of each aggregated links further comprises before receiving the link-state information that far-end MEP or MIP send: the described MEP that creates on aggregated links selects any one port of self place aggregated links that loopback message LBM message is sent to MIP or far-end MEP
Described MEP determines that the testing result of the link failure between self place equipment and far-end MEP or the MIP place equipment comprises: described MEP does not receive the LBR message that described MIP that any port of self place aggregated links reports or far-end MEP return in scheduled duration, then determine the link occurs fault with this MIP or far-end MEP place equipment room.
6, the method for claim 1 is characterized in that, described link-state information is: link trace response LTR message,
Describedly on each aggregated links, create after the MEP, any one port of each aggregated links further comprises before receiving the link-state information that far-end MEP or MIP send: the described MEP that creates on aggregated links selects any one port of self place aggregated links that link trace message LTM message is sent to far-end MEP
Described MEP determines that the testing result of the link failure between self place equipment and far-end MEP or the MIP place equipment comprises: described MEP is according to the link trace response LTR message that all of the port of self place aggregated links reports, and locatees the position of the link failure generation between self place equipment and far-end MEP or the MIP place equipment.
7, a kind of link failure detection device is characterized in that, comprising:
The aggregation port transceiver module receives the link-state information that any one port of self place aggregated links or far-end MEP or MIP send, and this message is sent to the MEP module of creating on self place aggregated links;
The MEP module receives the link-state information that the aggregation port transceiver module is sent, and according to paid-in all link-state informations, determines the testing result of the link failure between self place equipment and far-end MEP or the MIP place equipment.
8, device as claimed in claim 7, it is characterized in that, described device further comprises: non-polymeric port transceiver module, receive the link-state information that far-end MEP or MIP send, and this link-state information is sent to aggregation port transceiver module on self place aggregated links.
As claim 7 or 8 described devices, it is characterized in that 9, described aggregation port transceiver module and MEP module are positioned on the polymerization logic interface of aggregated links simultaneously, perhaps are positioned at simultaneously on the master port of aggregated links.
10, device as claimed in claim 8 is characterized in that, described non-polymeric port transceiver module is positioned on the member port of the aggregated links with polymerization logic interface, perhaps is positioned on the non-master port of the aggregated links with master port.
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