CN107241206A - The method and device that a kind of business service state judges - Google Patents
The method and device that a kind of business service state judges Download PDFInfo
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- CN107241206A CN107241206A CN201610184746.1A CN201610184746A CN107241206A CN 107241206 A CN107241206 A CN 107241206A CN 201610184746 A CN201610184746 A CN 201610184746A CN 107241206 A CN107241206 A CN 107241206A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
Abstract
The invention discloses the method and device that a kind of business service state judges, methods described is applied to Provider Edge PE equipment, including：Determine that this PE equipment accesses the business service abnormal state of side；Pseudo-wire control word is set, it is carried business service abnormal state information, and the pseudo wire PDU with the pseudo-wire control word is sent to the opposite end PE equipment being connected with this PE equipment；And when receiving the pseudo wire PDU that opposite end PE equipment is sent, according to the pseudo-wire control word of the pseudo wire PDU, business service state is judged.The method proposed by the present invention that business service state is judged based on PW control words, without configuring OAM or BFD, is directly controlled word state to judge, saves the network bandwidth, improve detection efficiency according to PW.
Description
Technical field
The present invention relates to the communications field, more particularly to the business service state of packet transmission field judges
Method and device.
Background technology
In PTN (Packet Transport Network, Packet Transport Network) network, business service state refers to
Business is in normal work or abnormal operation.How to judge whether business is normal, and at business
When abnormality, how quick failure judgement producing cause, be business service condition judgement method need solution
Certainly the problem of.
For the judgement of business service state, current existing method is, it is necessary to be based on MPLS-TP
(Multi-Protocol Label Switching Transport Profile, multiprotocol label switching transmission application)
OAM (Operation, Administration and Maintenance, operation management maintainance) technologies or BFD
(Bidirectional Fast Detection, two-way converting detection) technology carries out PW state-detections.This method
Business on off operating mode is indicated by the alarm under pseudo-wire test point.But, it is generally the case that either OAM
Or BFD detections all can propose requirements at the higher level to equipment process performance, and network bandwidth occupancy can also be increased；
And this method detection cycle needs 3.5 transmission cycles, that is to say, that if business is sent out within 3.5 cycles
Raw failure, service condition can not be accurately reflected with the method.
Therefore, how in the case where OAM or BFD need not be configured, it can effectively detect that business takes
Business state, while reducing network bandwidth occupancy, improves Detection accuracy, as to be solved by this invention
Technical problem.
The content of the invention
In view of the above problems, it is proposed that the present invention is to provide a kind of business service state solved the above problems
The method and device of judgement.
According to one aspect of the present invention there is provided a kind of method that business service state judges, applied to operation
Business edge PE equipment, methods described includes：
Determine that this PE equipment accesses the business service abnormal state of side；
Pseudo-wire control word is set, it is carried business service abnormal state information, and be connected to this PE equipment
Opposite end PE equipment send the pseudo wire PDU with the pseudo-wire control word；
And when receiving the pseudo wire PDU that opposite end PE equipment is sent, according to the pseudo- line traffic control of the pseudo wire PDU
Word, judges business service state.
According to another aspect of the present invention there is provided the device that a kind of business service state judges, applied to fortune
Business edge PE equipment is sought, described device includes：
Abnormal determining unit, for determining whether the business service state of this PE equipment access side is abnormal；
Processing unit, for when the abnormal determining unit determines business service abnormal state, setting pseudo-
Line traffic control word, makes its carry business service abnormal state information, and to the opposite end PE being connected with this PE equipment
Equipment sends the pseudo wire PDU with the pseudo-wire control word；And when the puppet for receiving opposite end PE equipment transmission
When report from a liner is literary, according to the pseudo-wire control word of the pseudo wire PDU, business service state is judged.
The present invention has the beneficial effect that：
It is proposed by the present invention based on PW control words judge business service state method, without configure OAM or
Person BFD, directly controls word state to judge according to PW, saves the network bandwidth, improves detection efficiency, obtains
Positive technique effect.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technology of the present invention
Means, and being practiced according to the content of specification, and in order to allow above and other objects of the present invention,
Feature and advantage can become apparent, below especially exemplified by the embodiment of the present invention.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are for ability
Domain those of ordinary skill will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and simultaneously
It is not considered as limitation of the present invention.And in whole accompanying drawing, identical is denoted by the same reference numerals
Part.In the accompanying drawings：
The flow chart for the method that Fig. 1 judges for a kind of business service state that the present invention is provided；
Fig. 2 is the PW control word format schematic diagrames defined in RFC4385；
Fig. 3 is local end PE equipment access side los failure schematic diagrames in the present invention；
Fig. 4 is local end PE equipment access another schematic diagram of side los failures in the present invention；
Fig. 5 is local end PE equipment access side linkdown failure schematic diagrames in the present invention；
Fig. 6 is local end PE equipment access side aggregation port failure of removal schematic diagram in the present invention；
Fig. 7 is local end PE equipment access side physical port is normal in the present invention but reception message number is less than threshold value
Failure schematic diagram；
Fig. 8 is normal but do not receive the signal of message failure for local end PE equipment access side physical port in the present invention
Figure；
Fig. 9 is network internal failure schematic diagram in the present invention；
The structured flowchart for the device that Figure 10 judges for a kind of business service state that the present invention is provided.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although being shown in accompanying drawing
The exemplary embodiment of the disclosure, it being understood, however, that may be realized in various forms the disclosure without should be by
Embodiments set forth here is limited.It is opposite to be able to be best understood from this there is provided these embodiments
It is open, and can by the scope of the present disclosure completely convey to those skilled in the art.
In order to solve to detect the problem of business service condition judgement method is present by configuring OAM or BFD,
The embodiment of the present invention proposes a kind of method that business service state judges, specifically, is based on PW controls
The method that the business service state of word judges, it is intended to overcome must configure in the prior art PW OAM or
BFD mode, to save Internet resources, reduces system implementation complexity, improves accuracy of detection.
Specifically, the method that the business service state that the present invention is provided judges, sets applied to Provider Edge PE
It is standby, as shown in figure 1, comprising the following steps：
Step S101, determines that this PE equipment accesses the business service abnormal state of side；
Step S102, set pseudo-wire control word, make its carry business service abnormal state information, and to this
The opposite end PE equipment of PE equipment connection sends the pseudo wire PDU for including the pseudo-wire control word；
Step S103, when receiving the pseudo wire PDU that opposite end PE equipment is sent, according to the pseudo wire PDU
Pseudo-wire control word, judges business service state.
In the present embodiment, during local terminal and opposite end are a relative concept, grouping conveying network, each PE equipment
With oneself as reference data, it is determined that certainly as local terminal, and connected PE equipment is then defined as opposite end.
In addition, it is necessary to which, it is noted that above-mentioned steps S102 and S103 do not possess strict ordinal relation.
Illustrated based on above-mentioned principle, several specific and preferred embodiments are given below, to refine and optimize
The function of the method for the invention, so that the implementation of the present invention program is more convenient, accurately.It should be noted that
In the case where not conflicting, following feature can be combined mutually.
In one particular embodiment of the present invention, PE equipment access side business service abnormal state include but
It is not limited to：PE equipment access side los failures, PE equipment access side linkdown failures, PE equipment connect
Enter side aggregation port failure of removal, PE equipment physical port it is normal but receive message number less than threshold value and
PE equipment physical port is normal but does not receive message.
In a preferred embodiment of the invention, the setting pseudo-wire control word, makes it carry business service
Abnormal state information, is specifically included：
Determine to be used for the field for carrying business service abnormal state information in preassigned pseudo-wire control word；
By the type and each bit set relation of the field of the business service abnormal state of setting, to described
Field carries out set processing.
That is, the present invention sets the SM set mode of pseudo-wire control word, the business service for making its correspondence different
The type of abnormal state, so as to realize the transmission of abnormal information.The set mode, without to pseudo-wire control word
Excessive change is done, it is simple to operate, easy, and transmitted data amount will not be increased, reduce accounting for for the network bandwidth
With.
As shown in Fig. 2 being the PW control word formats defined in RFC4385, one in the present invention is specific
In embodiment, the field for carrying business service abnormal state information is preferably First nibble (MPLS
The preceding nybble of control word in encapsulation) 4 bits and Flags fields 4 bits, naturally it is also possible to
Utilize other extension bits in pseudo-wire control word.
Further, in the embodiment of the present invention, when business service abnormal state information passes through to pseudo-wire control word
When set mode is issued, in the embodiment of the present invention, according to the pseudo-wire control word of the pseudo wire PDU, business is taken
Business state is judged, is specifically included：
Judge pseudo-wire control word specific field whether set；
When the specific field set, business service abnormal state is determined, and take according to the business of setting
The type and each bit set relation of the field of business abnormal state, determine business service abnormal state
Type.
In one particular embodiment of the present invention, pseudo-wire control word is set, it is carried business service state
After abnormal information, continuously transmitted to the opposite end PE equipment being connected with this PE equipment N number of with the pseudo- line traffic control
The pseudo wire PDU of word processed；The N is the positive integer more than or equal to 2, it is preferable that N takes 5.
Further, in the embodiment of the present invention, set when not receiving the opposite end PE in the period in setting
During the message that preparation is sent, assert that current path is unavailable, judge that current business is interrupted.That is, in the present invention
PE equipment judges business service state always according to from the packet receiving state of opposite end PE equipment.
In summary, it is known that the method proposed by the present invention that business service state is judged based on PW control words,
OAM or BFD need not be configured, directly controls word state to judge according to PW, saves the network bandwidth,
Improve detection efficiency.
Several concrete application examples of the present invention are provided with reference to Fig. 3 to Fig. 9, are illustrated to clearer
The implementation process of the present invention.
Using example one
This accesses side los failures using the application scenarios of example for PE equipment, is PE as shown in Figure 3,4
Equipment accesses the specific schematic diagram of side los failures.Under the scene, the implementation process of the method for the invention is：
Step 1, local end PE equipment determines access side los failures；
Step 2, local end PE equipment continuously transmits 5 pseudo wire PDU with pseudo-wire control word and set to opposite end PE
It is standby；Wherein, when carrying out pseudo wire PDU encapsulation, pseudo-wire control word First nibble=0001 (binary) are set,
And by the minimum bit positions 1 of Flags fields；
Step 3, PE equipment in opposite end detects local end PE equipment on current business path and sends pseudo wire PDU；
Step 4, PE equipment in opposite end extracts the pseudo-wire control word of pseudo wire PDU, obtains specifying in pseudo-wire control word
The state of field is：First nibble=0001 (binary) and the minimum bit positions 1 of Flags fields.
Step 5, PE equipment in opposite end thinks current path according to the state of First nibble values and Flags fields
It is unavailable, judge that current business is interrupted.
Using example two
Using the application scenarios of example, for PE equipment access side linkdown failures, (Ethernet ports do not connect for this
Connect), as shown in figure 5, accessing the specific schematic diagram of side linkdown failures for PE equipment.Under the scene,
The implementation process of the method for the invention is：
Step 1, local end PE equipment determines access side linkdown failures；
Step 2, local end PE equipment continuously transmits 5 pseudo wire PDU with pseudo-wire control word and set to opposite end PE
It is standby；Wherein, when carrying out pseudo wire PDU encapsulation, pseudo-wire control word First nibble=0001 (binary) are set,
And by the 3rd bit position 1 of Flags fields；
Step 3, PE equipment in opposite end detects local end PE equipment on current business path and sends pseudo wire PDU；
Step 4, PE equipment in opposite end extracts the pseudo-wire control word of pseudo wire PDU, obtains specifying in pseudo-wire control word
The state of field is：The 3rd bit position 1 of First nibble=0001 (binary) and Flags fields；
Step 5, PE equipment in opposite end thinks current path according to the state of First nibble values and Flags fields
It is unavailable, judge that current business is interrupted.
Using example three
This accesses side aggregation port failure of removal using the application scenarios of example for PE equipment, as shown in fig. 6,
The specific schematic diagram of side aggregation port failure of removal is accessed for PE equipment.Under the scene, side of the present invention
The implementation process of method is：
Step 1, local end PE equipment determines access side aggregation port failure of removal；
Step 2, local end PE equipment continuously transmits 5 pseudo wire PDU with pseudo-wire control word and set to opposite end PE
It is standby；Wherein, when carrying out pseudo wire PDU encapsulation, pseudo-wire control word First nibble=0001 (binary) are set,
And by the 2nd bit position 1 of Flags fields；
Step 3, PE equipment in opposite end detects local end PE equipment on current business path and sends pseudo wire PDU；
Step 4, PE equipment in opposite end extracts the pseudo-wire control word of pseudo wire PDU, obtains specifying in pseudo-wire control word
The state of field is：The 2nd bit position 1 of First nibble=0001 (binary) and Flags fields；
Step 5, PE equipment in opposite end thinks current path according to the state of First nibble values and Flags fields
It is unavailable, judge that current business is interrupted.
Using example four
This applies the application scenarios of example to be that PE equipment physical port is normal but reception message number is less than threshold value event
Barrier, as shown in fig. 7, normal but to receive message number specific less than threshold fault for PE equipment physical port
Schematic diagram.Under the scene, the implementation process of the method for the invention is：
Step 1, local end PE equipment determines that equipment physical port is normal but receives message number less than threshold value event
Barrier；
Step 2, the message received is carried out pseudo wire PDU encapsulation by local end PE equipment, and in pseudo wire PDU encapsulation
When, pseudo-wire control word First nibble=0000 (binary) are kept, Flags field highest bit positions 1 are set；
Step 3, local end PE equipment sends the pseudo wire PDU that encapsulation is obtained to opposite end PE equipment；
Step 4, PE equipment in opposite end detects local end PE equipment on current business path and sends pseudo wire PDU；
Step 5, PE equipment in opposite end extracts the pseudo-wire control word of pseudo wire PDU, obtains specifying in pseudo-wire control word
The state of field is：First nibble=0000 (binary) and Flags field highest bit positions 1；
Step 6, PE equipment in opposite end thinks current business according to the state of First nibble values and Flags fields
It is improper, judge that current business is abnormal.
Using example five
This normally but does not receive message failure using the application scenarios of example for PE equipment physical port, such as schemes
It is that PE equipment physical port is normal but do not receive the specific schematic diagram of message failure shown in 8.In the scene
Under, the implementation process of the method for the invention is：
Step 1, local end PE equipment determines that equipment access side physical port is normal but does not receive message failure；
Step 2, local end PE equipment continuously transmits 5 pseudo wire PDU with pseudo-wire control word and set to opposite end PE
It is standby；Wherein, when carrying out pseudo wire PDU encapsulation, pseudo-wire control word First nibble=0000 (binary) are set,
And by the 2nd bit position 1 of Flags fields；
Step 3, PE equipment in opposite end detects local end PE equipment on current business path and sends pseudo wire PDU；
Step 4, PE equipment in opposite end extracts the pseudo-wire control word of pseudo wire PDU, obtains specifying in pseudo-wire control word
The state of field is：First nibble=0000 (binary), and by the 2nd bit position 1 of Flags fields；
Step 5, PE equipment in opposite end thinks current business according to the state of First nibble values and Flags fields
It is improper, judge that current business is abnormal.
Using example six
This is network internal failure using the application scenarios of example, specific as shown in figure 9, under the scene,
Due to network internal failure.The message that local end PE equipment is sent to opposite end PE equipment can not be sent to, opposite end PE
Equipment does not receive the message sent from local end PE equipment within a certain period of time, it is believed that current path is unavailable,
Judge that current business is interrupted.
It is pointed out that field set mode of the above-mentioned application example one into application example five is one kind
Specific example, those skilled in the art can according to self-demand, flexible setting set and Exception Type
Corresponding relation, aaset bit mode and corresponding relation do not do unique restriction to the present invention.
The embodiment of the present invention also provides the device that a kind of business service state judges, the device can be as independent
Part be integrated in PE equipment, but it is further preferred that it is that existing unit module in PE equipment is carried out
Unit module set after function renewal.As shown in Figure 10, described device of the embodiment of the present invention includes：
Abnormal determining unit 1010, for determining whether the business service state of this PE equipment access side is abnormal；
Processing unit 1020, for when abnormal determining unit 1010 determines business service abnormal state, if
Pseudo-wire control word is put, its is carried business service abnormal state information, and to the opposite end being connected with this PE equipment
PE equipment sends the pseudo wire PDU with the pseudo-wire control word；And sent when receiving opposite end PE equipment
Pseudo wire PDU when, according to the pseudo-wire control word of the pseudo wire PDU, business service state is judged.
Based on said structure framework and implementation principle, under the above constitution several specific and preferably is given below
Embodiment, the function to refine and optimize device of the present invention, so that the implementation of the present invention program is more
It is convenient, accurately.Specifically related to following content：
In the present embodiment, processing unit 1020 sets pseudo-wire control word, it is carried business service state different
Normal information, is preferably but not limited to realize in the following way：
Determine to be used for the field for carrying business service abnormal state information in preassigned pseudo-wire control word；
By the type and each bit set relation of the field of the business service abnormal state of setting, to described
Field carries out set processing, it is carried business service abnormal state information.
Wherein, field can be, but not limited to First nibble and the Flags fields for pseudo-wire control word.
Further, in the present embodiment, processing unit 1020 sets pseudo-wire control word, makes its carrying business
After service state abnormal information, N number of band has been continuously transmitted to the opposite end PE equipment being connected with this PE equipment
State the pseudo wire PDU of pseudo-wire control word；The N is the positive integer more than or equal to 2.
Further, in the present embodiment, processing unit 1020, when the pseudo-wire for receiving opposite end PE equipment transmission
During message, judge its pseudo-wire control word specific field whether set, when the specific field set, sentence
Make business service abnormal state, and it is each according to the type and the field of the business service abnormal state of setting
The set relation of bit, determines the type of business service abnormal state.
Further, in the present embodiment, processing unit 1020 does not connect determining within the period of setting
When receiving the message that opposite end PE equipment is sent, assert that current path is unavailable, judge that current business is interrupted.
In one particular embodiment of the present invention, processing unit 1020 is specifically included：
Pseudo wire PDU receives detection module, for detecting whether receiving the pseudo wire PDU of opposite equip. transmission；
If not receiving pseudo wire PDU, pseudo-wire control word state detection module does not work.
Pseudo-wire control word state detection module, for receiving puppet when pseudo wire PDU reception detection module is detected
When report from a liner is literary, the pseudo wire PDU received is judged pseudo-wire control word state whether set, different pseudo- line traffic controls
Word SM set mode represents different business service states.
Business service state determination module, the puppet on the one hand detected according to pseudo-wire control word state detection module
Line traffic control word SM set mode, corresponding business service state is determined as by different pseudo-wire control word SM set mode；
On the other hand when pseudo wire PDU reception detection module, which is detected, can not receive pseudo wire PDU in certain time, business
Service state determination module judges business for interrupt status.
In summary, it is known that the device proposed by the present invention that business service state is judged based on PW control words,
OAM or BFD need not be configured, directly controls word state to judge according to PW, saves the network bandwidth,
Improve detection efficiency.
Each embodiment in this specification is described by the way of progressive, identical phase between each embodiment
As part mutually referring to, what each embodiment was stressed be its it is different from other embodiment it
Place.For device embodiment, due to its substantially similar and embodiment of the method, so, description
Fairly simple, the relevent part can refer to the partial explaination of embodiments of method.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment
It can be by program to instruct the hardware of correlation to complete, the program can be stored in one and computer-readable deposit
In storage media, storage medium can include：ROM, RAM, disk or CD etc..
In a word, the foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the guarantor of the present invention
Protect scope.Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc.,
It should be included in the scope of the protection.
Claims (12)
1. a kind of method that business service state judges, it is characterised in that set applied to Provider Edge PE
Standby, methods described includes：
Determine that this PE equipment accesses the business service abnormal state of side；
Pseudo-wire control word is set, it is carried business service abnormal state information, and be connected to this PE equipment
Opposite end PE equipment send the pseudo wire PDU with the pseudo-wire control word；
And when receiving the pseudo wire PDU that opposite end PE equipment is sent, according to the pseudo- line traffic control of the pseudo wire PDU
Word, judges business service state.
2. the method as described in claim 1, it is characterised in that the setting pseudo-wire control word, takes it
Band business service abnormal state information, is specifically included：
Determine to be used for the field for carrying business service abnormal state information in preassigned pseudo-wire control word；
By the type and each bit set relation of the field of the business service abnormal state of setting, to described
Field carries out set processing.
3. method as claimed in claim 2, it is characterised in that the field includes：Pseudo-wire control word
First nibble and Flags fields.
4. the method as described in claim 1 or 2 or 3, it is characterised in that it is described to this PE equipment
The opposite end PE equipment of connection sends the pseudo wire PDU with the pseudo-wire control word, specifically includes：
N number of puppet with the pseudo-wire control word is continuously transmitted to the opposite end PE equipment being connected with this PE equipment
Report from a liner text；The N is the positive integer more than or equal to 2.
5. method as claimed in claim 2 or claim 3, it is characterised in that the puppet according to the pseudo wire PDU
Line traffic control word, judges business service state, specifically includes：
Judge pseudo-wire control word specific field whether set；
When the specific field set, business service abnormal state is determined, and take according to the business of setting
The type and each bit set relation of the field of business abnormal state, determine business service abnormal state
Type.
6. the method as described in claim 1, it is characterised in that methods described also includes：
When not receiving the message that the opposite end PE equipment is sent in the period in setting, current road is assert
Footpath is unavailable, judges that current business is interrupted.
7. the device that a kind of business service state judges, it is characterised in that set applied to Provider Edge PE
Standby, described device includes：
Abnormal determining unit, for determining whether the business service state of this PE equipment access side is abnormal；
Processing unit, for when the abnormal determining unit determines business service abnormal state, setting pseudo-
Line traffic control word, makes its carry business service abnormal state information, and to the opposite end PE being connected with this PE equipment
Equipment sends the pseudo wire PDU with the pseudo-wire control word；And when the puppet for receiving opposite end PE equipment transmission
When report from a liner is literary, according to the pseudo-wire control word of the pseudo wire PDU, business service state is judged.
8. device as claimed in claim 7, it is characterised in that the processing unit, specifically for determining
It is used for the field for carrying business service abnormal state information in preassigned pseudo-wire control word, by the industry of setting
The abnormal type of service state of being engaged in and each bit set relation of the field, are carried out at set to the field
Reason, makes it carry business service abnormal state information.
9. device as claimed in claim 8, it is characterised in that the field includes：Pseudo-wire control word
First nibble and Flags fields.
10. the device as described in claim 7 or 8 or 9, it is characterised in that the processing unit, tool
Body, which is used to continuously transmit to the opposite end PE equipment that be connected with this PE equipment, N number of carries the pseudo-wire control word
Pseudo wire PDU；The N is the positive integer more than or equal to 2.
11. device as claimed in claim 8 or 9, it is characterised in that the processing unit, specific to use
In when receiving the pseudo wire PDU that opposite end PE equipment is sent, judge its pseudo-wire control word specific field whether
Set, when the specific field set, determines business service abnormal state, and according to the business of setting
The abnormal type of service state and each bit set relation of the field, determine business service abnormal state
Type.
12. device as claimed in claim 7, it is characterised in that the processing unit, is additionally operable to work as
When not receiving the message that the opposite end PE equipment is sent in the period of setting, assert that current path is unavailable,
Judge that current business is interrupted.
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| CN201610184746.1A CN107241206B (en) | 2016-03-29 | 2016-03-29 | Method, device and storage medium for judging service state |
| PCT/CN2017/073554 WO2017166932A1 (en) | 2016-03-29 | 2017-02-15 | Method and apparatus for determining service state |
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| CN201610184746.1A CN107241206B (en) | 2016-03-29 | 2016-03-29 | Method, device and storage medium for judging service state |
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| WO2017166932A1 (en) | 2017-10-05 |
| CN107241206B (en) | 2022-02-18 |
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