CN106330695A - Service control method and device - Google Patents
Service control method and device Download PDFInfo
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- CN106330695A CN106330695A CN201510355134.XA CN201510355134A CN106330695A CN 106330695 A CN106330695 A CN 106330695A CN 201510355134 A CN201510355134 A CN 201510355134A CN 106330695 A CN106330695 A CN 106330695A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a service control method and device. A service control module receives a service establishment request through a first interface; a path calculation request is sent to a path calculation module according to a service attribute and a service state; the path calculation module calculates a service path or a service recovery path; the service control module sends the service path or the service recovery path obtained through calculation to a first node of the service path through a second interface; a service path establishment request is sent to the first node, thereby enabling the first node to establish the service path or the service recovery path through a RSVP (Resource Reservation Protocol); and when the service path is established or recovered successfully, a path management module updates stored service actual paths.
Description
Technical field
The present invention relates to transport network communication field, particularly relate to state path computing unit (PCE, Path
Computation Element) under service control method and device.
Background technology
The control plane technology of transmission communication network is gradually from Technology of Traffic Engineering based on multiprotocol label switching
(MPLS-TE, Multi-Protocol Label Switching-Traffic Engineer) and general multiple protocols mark
Sign the distributed AC servo system of exchange (GMPLS, Generalized Multi-Protocol Label Switching),
Control technology to the centralized intelligence of software defined network (SDN, Software Defined Network) to send out
Exhibition.
In above-mentioned control mode, key technology still concentrates on above path computing and operational control.Path is counted
Calculation aspect, introducing PCE, as single functional entity, is specifically designed to the service path become increasingly complex and calculates.
Operational control aspect, traditional correlation technique based on MPLS-TE with GMPLS becomes with standard the most very much
Ripe, it mainly utilizes RSVP (RSVP, Resource Reservation Protocol) to set up
Label switched path (LSP, Label Switched Path).Business is managed by the mode of management LSP,
It has a problem in that every business is all to be managed by the first node of transmission network, decentralised control, brings overall situation business
Cannot the problem such as optimization and control hazard, the most progressively propose the central controlled concept of SDN, but at present
SDN is in relevant criterion immature, and especially for optical-fiber network aspect, relevant business sets up which kind of uses
Flow process, which kind of cross means mode are still not clear.
Along with there being the introducing of state PCE technology, PCE can obtain the business that all control planes are set up, the palm
Holding whole LSP, draft-ietf-pce-pce-initiated-lsp draft proposes to initiate the foundation of LSP from PCE,
But be only merely simple triggering business to set up, for recovery commonly used in transmission network, protection and
The Service control of multitiered network then without reference to.
Summary of the invention
For solving above-mentioned technical problem, embodiments provide a kind of service control method and device.
The service control method that the embodiment of the present invention provides includes:
Reception business sets up request, and calculates service path or business recovery according to service attribute and service condition
Path；
According to calculated service path or business recovery path, send business to the first node of service path
Request is set up in path, so that described first node is set up service path by RSVP or recovers service path；
After service path is set up or is successfully recovered, update the business Actual path stored.
In the embodiment of the present invention, described according to service attribute and service condition calculating service path or business recovery
Path, including:
When described service condition be business set up time, directly calculate service path；
When described service condition is traffic failure, according to the recovery attribute in business attribute information and association
Path computing business recovery path；
Wherein, the request content during described reception business sets up request includes: business head in a transport network
Tail access-in point information, grade of service information, service traffics parameter, signal type, recovery attribute, protection belong to
Property；Described service attribute includes: the business that receives sets up the request content in request, associated path.
In the embodiment of the present invention, described method also includes:
When malfunction monitoring point detects fault, receive described first node transmission and show that service condition is business event
The information of barrier, and service condition is updated.
In the embodiment of the present invention, described service path is set up in request and is carried recovery attribute, described recovery attribute
Indicate whether set up service path has recovery capability；
Described method also includes: when the first node of service path sends service path foundation request, also will meter
The service path obtained and pre-set path are sent to the first node of described service path.
In the embodiment of the present invention, described method also includes:
When there is pre-set path, pre-set path is used to recover business after business breaks down；When not existing
During pre-set path, recalculate service path after reporting fault information, and the foundation of initiation service path please again
Ask, wherein, original route is avoided when path computing as associated path.
In the embodiment of the present invention, described service path is set up in request and is carried protection attribute, described protection attribute
Indicate that set up service path is duty or guard mode, and be protection side during guard mode
Formula；
The described first node transmission service path to service path sets up request, including:
The a plurality of service path calculated and protection attribute are sent to the first node of described service path.
In the embodiment of the present invention, described service path is set up in request and is carried extension link attribute, described extension
Link attribute indicates that set up service path forms link；
The described first node transmission service path to service path sets up request, including:
Described extension link attribute is sent to the first node of described service path.
The business control device that the embodiment of the present invention provides includes:
Message control module, sets up request for receiving business by first interface；And according to service attribute and
Service condition is to path calculation module path computation request；
Path calculation module, is used for calculating service path or business recovery path；
Message control module, is additionally operable to connect calculated service path or business recovery path by second
Mouth is sent to the first node of service path, sends service path to described first node and sets up request, so that described
First node is set up service path by RSVP or recovers service path；
Path management module, after setting up when service path or be successfully recovered, updates the business stored real
Path, border.
In the embodiment of the present invention, described device also includes: service condition management module, for storage service road
The service condition in footpath；
Described path calculation module, be additionally operable to when described service condition be business set up time, directly calculate business
Path；When described service condition is traffic failure, according to the recovery attribute in business attribute information and pass
Connection path computing business recovery path；
Wherein, the request content during described reception business sets up request includes: business head in a transport network
Tail access-in point information, grade of service information, service traffics parameter, signal type, recovery attribute, protection belong to
Property；Described service attribute includes: the business that receives sets up the request content in request, associated path.
In the embodiment of the present invention, described service condition management module, it is additionally operable to when malfunction monitoring point detects event
During barrier, receive described first node transmission and show the information that service condition is traffic failure, and service condition is entered
Row updates.
In the embodiment of the present invention, described service path is set up in request and is carried recovery attribute, described recovery attribute
Indicate whether set up service path has recovery capability；
Described message control module, is additionally operable to be sent to described recovery attribute the first node of described service path.
In the embodiment of the present invention, described message control module, it is additionally operable to when there is pre-set path, in business
Pre-set path is used to recover business after breaking down；When there is not pre-set path, make after reporting fault information
Path calculation module recalculates service path, and again initiates service path foundation request, wherein, by former
Path is avoided when path computing as associated path.
In the embodiment of the present invention, described service path is set up in request and is carried protection attribute, described protection attribute
Indicate that set up service path is duty or guard mode, and be protection side during guard mode
Formula；
Described message control module, is additionally operable to be sent to a plurality of service path calculated and protection attribute
The first node of described service path.
In the embodiment of the present invention, described service path is set up in request and is carried extension link attribute, described extension
Link attribute indicates that set up service path forms link；
Described message control module, is additionally operable to be sent to described extension link attribute the head of described service path
Node.
In the technical scheme of the embodiment of the present invention, in having state PCE, introduce business control device, this device
Realize reception business and set up request, and calculate service path or business recovery according to service attribute and service condition
Path；According to calculated service path or business recovery path, send industry to the first node of service path
Request is set up in business path, so that described first node is set up service path by RSVP or recovers service path；
After service path is set up or is successfully recovered, update the business Actual path stored.This device is utilized to have
Achieve centralized Control business in state PCE, trigger transmission node according to MPLS-TE or GMPLS
Mode set up related service, set up the base of mode in the business utilizing MPLS-TE and GMPLS ripe
On plinth, it is achieved that Based Intelligent Control centralization, it is achieved that recover, protect and the Service control of multitiered network.
Accompanying drawing explanation
Fig. 1 is the flow process signal of the service control method of the embodiment of the present invention；
Fig. 2 is the structure composition schematic diagram of the business control device of the embodiment of the present invention；
Fig. 3 is that the two-layer transport network traffic of the embodiment of the present invention sets up schematic diagram.
Detailed description of the invention
In order to more fully hereinafter understand feature and the technology contents of the embodiment of the present invention, below in conjunction with the accompanying drawings
Realization to the embodiment of the present invention is described in detail, appended accompanying drawing purposes of discussion only for reference, is not used for
Limit the embodiment of the present invention.
Fig. 1 is the schematic flow sheet of the service control method of the embodiment of the present invention, the Service control in this example
Method is applied in business control device, as it is shown in figure 1, described service control method comprises the following steps:
Step 101: the business that receives sets up request, and calculates service path according to service attribute and service condition
Or business recovery path.
In the embodiment of the present invention, the request content that described reception business is set up in request includes but not limited to: industry
Business head and the tail access-in point information in a transport network, grade of service information, service traffics parameter, signal type,
Recover attribute, protection attribute.
Here, reception business sets up the mode of request to be had multiple: can be built by webmaster issuing service by user
Vertical request is to business control device or is received after business sets up request by transmission node and is transmitted to Service control
Device or by SDN application by business set up please be sent to business control device or other network phase
Close entity and send business foundation request to business control device.
In the embodiment of the present invention, described service attribute includes: receive business set up request in request content,
Associated path.
In the embodiment of the present invention, described service condition includes setting up state, malfunction etc..
In the embodiment of the present invention, when described service condition be business set up time, directly calculate service path；
When described service condition is traffic failure, according to the recovery attribute in business attribute information and association
Path computing business recovery path；
Step 102: according to calculated service path or business recovery path, to the first joint of service path
Point sends service path and sets up request, so that described first node sets up business by RSVP RSVP
Path or recovery service path.
In the embodiment of the present invention, the service path request of setting up is specially triggering LSP and sets up message, and this message is led to
Cross path computation element protocol (PCEP, Path Computation Element Protocol) to send.
In the embodiment of the present invention, service path is set up in request and is extended following one or more attribute: recover
Attribute, protection attribute, extension link attribute.When service path relates to many levels, business control device
Need to be according to different levels, partition service path, trigger relevant service path respectively at each level and set up,
The order triggered is first to trigger service layer LSP to set up, then triggers the foundation of client layer LSP.
In the first embodiment, described service path is set up and is carried recovery attribute in request, and described recovery belongs to
Property indicates whether set up service path has recovery capability；Described method also includes: to service path
When first node sends service path foundation request, also calculated service path and pre-set path are sent to
The first node of described service path.
Here, when there is pre-set path, use pre-set path to recover business after business breaks down；When
When there is not pre-set path, recalculate service path after reporting fault information, and again initiate service path
Set up request, wherein, original route is avoided when path computing as associated path.
In this second embodiment, described service path is set up and is carried protection attribute in request, and described protection belongs to
Property indicates that set up service path is duty or guard mode, and protection when being guard mode
Mode；The described first node transmission service path to service path sets up request, including: many by calculating
Bar service path and protection attribute are sent to the first node of described service path.
In the third embodiment, described service path carries extension link attribute, described expansion in setting up request
Exhibition link attribute indicates that set up service path forms link；The described first node transmission industry to service path
Request is set up in business path, including: described extension link attribute is sent to the first node of described service path.
Step 103: after service path is set up or is successfully recovered, updates the business Actual path stored.
In the embodiment of the present invention, after service path is set up or is successfully recovered, first node is to business control device
Report service path is set up or is successfully recovered, and business control device receives this message and updates stored business
Actual path.
In the embodiment of the present invention, service path is in maintenance state after initialization, when malfunction monitoring point detects
During to fault, RSVP is utilized to notify the first node of service path, and by the first node of service path
It is advertised to business control device and updates related traffic state.I.e. when malfunction monitoring point detects fault, receive
Described first node sends and shows the information that service condition is traffic failure, and is updated service condition.So
After, the operation such as business control device determines whether to carry out to recover according to service condition, reply, again touch business
The foundation in path or recovery.
Fig. 2 is the structure composition schematic diagram of the business control device of the embodiment of the present invention, as in figure 2 it is shown, institute
State device to include:
Message control module 21, sets up request for receiving business by first interface 41；And according to business
Attribute and service condition are to path calculation module path computation request；
Path calculation module 22, is used for calculating service path or business recovery path；
Message control module 21, is additionally operable to calculated service path or business recovery path are passed through second
Interface 42 is sent to the first node of service path, sends service path to described first node and sets up request, so that
Described first node is set up service path by RSVP or recovers service path；
Path management module 23, after setting up when service path or be successfully recovered, updates the business stored
Actual path.
In the embodiment of the present invention, described device also includes: service condition management module 24, for storage service
The service condition in path；
Described path calculation module 22, be additionally operable to when described service condition be business set up time, directly calculate industry
Business path；When described service condition is traffic failure, according to the recovery attribute in business attribute information and
Associated path calculates business recovery path；
Wherein, the request content during described reception business sets up request includes: business head in a transport network
Tail access-in point information, grade of service information, service traffics parameter, signal type, recovery attribute, protection belong to
Property；Described service attribute includes: the business that receives sets up the request content in request, associated path.
In the embodiment of the present invention, described service condition management module 24, it is additionally operable to when malfunction monitoring point detects
During fault, receive described first node transmission and show the information that service condition is traffic failure, and to service condition
It is updated.
In the embodiment of the present invention, described service path is set up in request and is carried recovery attribute, described recovery attribute
Indicate whether set up service path has recovery capability；
Described message control module 21, is additionally operable to be sent to described recovery attribute the first joint of described service path
Point.
In the embodiment of the present invention, described service path is set up in request and is carried recovery attribute, described recovery attribute
Indicate whether set up service path has recovery capability；
Described message control module 21, is additionally operable to be sent to described recovery attribute the first joint of described service path
Point.
In the embodiment of the present invention, described message control module 21, it is additionally operable to when there is pre-set path, in industry
Business uses pre-set path to recover business after breaking down；When there is not pre-set path, after reporting fault information
Make path calculation module 22 recalculate service path, and again initiate service path foundation request, wherein,
Original route is avoided as associated path when path computing.
In the embodiment of the present invention, described service path is set up in request and is carried protection attribute, described protection attribute
Indicate that set up service path is duty or guard mode, and be protection side during guard mode
Formula；
Described message control module 21, is additionally operable to send a plurality of service path calculated and protection attribute
To the first node of described service path.
In the embodiment of the present invention, described service path is set up in request and is carried extension link attribute, described extension
Link attribute indicates that set up service path forms link；
Described message control module 21, is additionally operable to described extension link attribute is sent to described service path
First node.
It will be appreciated by those skilled in the art that each unit in the business control device shown in Fig. 2 realizes merit
The associated description of aforementioned service control method can be can refer to and understand.In business control device shown in Fig. 2
The function of each unit can be realized by the program that runs on processor, it is possible to by concrete logic circuit
And realize.
Below in conjunction with concrete scene, the service control method of the embodiment of the present invention is elaborated further.
Scene one
The required service needed set up recovers attribute, then, after monitoring traffic failure, set up by new route
Recover business.Setting up extension recovery attribute in message triggering LSP, when business is set up, Service control fills
Put and set up message by triggering LSP, the property notification first node to service path will be recovered.Recover attribute to refer to
Whether the LSP of bright foundation possesses recovery capability, if specifying the restoration path after fault by preset mode, then
Restoration path can also reside in recovery attribute in issue, initialization path can arrange a plurality of meet the most extensive
Multiple.
The LSP set up by RSVP, after fault occurs, fault is known by the first node of LSP, if this LSP
Possess recovery capability, then start and recover flow process, otherwise report lsp failure to notify business control device.
If this LSP exists initialization path, then LSP head node directly utilizes initialization path and carries out newly
LSP set up, after being successfully established, report path corresponding to the new LSP of business control device, business control
This LSP is associated with in business by molding block, and the respective path of new LSP updates service path management
Module；If not having initialization path, then LSP head node reports business control device, notice business event
Barrier, business control device confirms that this business possesses recovery capability, initiates new path computing, obtain new
After service path, trigger new LSP service path to first node and set up, journalism on first node after being successfully established
Business control module, this LSP is associated with in business by message control module, and by the respective path of new LSP
Update to path management module.
Scene two
The required service needed protection attribute set up, then, when business is set up, according to protection information, calculate
A plurality of LSP path, sets up extended protection attribute in message, when business is set up, Service control triggering LSP
Device sets up message, by the protection property notification of every LSP and correspondence thereof to service path by triggering LSP
First node.Protection attribute indicates that this LSP is work LSP or protection, and protected mode, protection
Mode refers to 1+1,1:1, m:n etc..
After traffic failure, quickly switch according to relaying configuration transmission equipment, and business head node need to determine industry
The LSP at business flow place, and notify, to there being state PCE, to update to path management module.
Scene three
Required set up business span-domain many levels time, then when business is set up, path calculation module calculate
Service path in, indicate the path of each level, set up business, service layer's business respectively at each level
After being successfully established, form TE Link and issue for service layer's business, the first first node at service layer LSP
Trigger LSP and set up message, set up extension link attribute in message triggering LSP, indicate that this LSP sets up
Needing afterwards to form link, after service layer LSP is successfully established, reporting service controls device, and notifies industry
Business control device service layer LSP formed link information, then client layer is issued triggering LSP set up message,
Set up related service.
Such as Fig. 3, being a two-tier network, link 22a, 22b, 22c are service layer's links, link 11a,
11b is client layer chain-link.Business control device receives business and sets up request, sets up to node 4 from node 1
One transmission business, through calculating, determine service path from node 1 through link 11a, 22a, 22b,
22c, 11b arrive node 4, and wherein service layer path is link 22a, 22b, 22c.Business control device is first
First send triggering LSP to node 2 and set up message (1), wherein carry service layer path and link attribute, chain
Road attribute indicates that service layer's business is successfully established one client layer chain-link of formation afterwards, and node 2 utilizes RSVP
Agreement is initiated to set up service layer's business, is the most finally successfully established through RSVP and takes out link
11c.After service layer's business is successfully established, node 2 is by the client layer chain-link 11c taken out and service layer service
The information that is successfully established notifies business control device by reporting message (2), and business control device determines client layer
Service path is link 11a, 11c, 11b, sets up message (3) by triggering LSP and is sent to node 1,
Node 1 utilizes RSVP to initiate to set up client layer business, wherein carries client trail, through RSVP
Protocol interaction is finally successfully established, and is successfully established by reporting message (4) notice business control device business.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for ability
For the technical staff in territory, the present invention can have various modifications and variations.All in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvement etc. made, should be included in protection scope of the present invention it
In.
Claims (14)
1. a service control method, it is characterised in that described method includes:
Reception business sets up request, and calculates service path or business recovery according to service attribute and service condition
Path；
According to calculated service path or business recovery path, send business to the first node of service path
Request is set up in path, so that described first node sets up service path or recovery by RSVP RSVP
Service path；
After service path is set up or is successfully recovered, update the business Actual path stored.
Service control method the most according to claim 1, it is characterised in that described according to service attribute
Service path or business recovery path is calculated with service condition, including:
When described service condition be business set up time, directly calculate service path；
When described service condition is traffic failure, according to the recovery attribute in business attribute information and association
Path computing business recovery path；
Wherein, the request content during described reception business sets up request includes: business head in a transport network
Tail access-in point information, grade of service information, service traffics parameter, signal type, recovery attribute, protection belong to
Property；Described service attribute includes: the business that receives sets up the request content in request, associated path.
Service control method the most according to claim 2, it is characterised in that described method also includes:
When malfunction monitoring point detects fault, receive described first node transmission and show that service condition is business event
The information of barrier, and service condition is updated.
Service control method the most according to claim 2, it is characterised in that described service path is set up
Carrying recovery attribute in request, described recovery attribute indicates whether set up service path has recovery capability；
Described method also includes: when the first node of service path sends service path foundation request, also will meter
The service path obtained and pre-set path are sent to the first node of described service path.
Service control method the most according to claim 4, it is characterised in that described method also includes:
When there is pre-set path, pre-set path is used to recover business after business breaks down；
When there is not pre-set path, recalculating service path after reporting fault information, and again initiating industry
Request is set up in business path, wherein, is avoided as associated path when path computing by original route.
Service control method the most according to claim 2, it is characterised in that described service path is set up
Carrying protection attribute in request, described protection attribute indicates that set up service path is duty or guarantor
Protect state, and protected mode when being guard mode；
The described first node transmission service path to service path sets up request, including:
The a plurality of service path calculated and protection attribute are sent to the first node of described service path.
Service control method the most according to claim 2, it is characterised in that described service path is set up
Carrying extension link attribute in request, described extension link attribute indicates that set up service path forms link；
The described first node transmission service path to service path sets up request, including:
Described extension link attribute is sent to the first node of described service path.
8. a business control device, it is characterised in that described device includes:
Message control module, sets up request for receiving business by first interface；And according to service attribute and
Service condition is to path calculation module path computation request；
Path calculation module, is used for calculating service path or business recovery path；
Message control module, is additionally operable to connect calculated service path or business recovery path by second
Mouth is sent to the first node of service path, sends service path to described first node and sets up request, so that described
First node is set up service path by RSVP or recovers service path；
Path management module, after setting up when service path or be successfully recovered, updates the business stored real
Path, border.
Business control device the most according to claim 8, it is characterised in that described device also includes:
Service condition management module, for the service condition in storage service path；
Described path calculation module, be additionally operable to when described service condition be business set up time, directly calculate business
Path；When described service condition is traffic failure, according to the recovery attribute in business attribute information and pass
Connection path computing business recovery path；
Wherein, the request content during described reception business sets up request includes: business head in a transport network
Tail access-in point information, grade of service information, service traffics parameter, signal type, recovery attribute, protection belong to
Property；Described service attribute includes: the business that receives sets up the request content in request, associated path.
Business control device the most according to claim 9, it is characterised in that described service condition pipe
Reason module, is additionally operable to when malfunction monitoring point detects fault, receives described first node transmission and shows business shape
State is the information of traffic failure, and is updated service condition.
11. business control devices according to claim 10, it is characterised in that described service path is built
Carrying recovery attribute in vertical request, described recovery attribute indicates whether set up service path has recovery energy
Power；
Described message control module, is additionally operable to be sent to described recovery attribute the first node of described service path.
12. business control devices according to claim 11, it is characterised in that described Service control mould
Block, is additionally operable to when there is pre-set path, uses pre-set path to recover business after business breaks down；When
When there is not pre-set path, make path calculation module recalculate service path after reporting fault information, lay equal stress on
New service path of initiating sets up request, wherein, is avoided as associated path when path computing by original route.
13. business control devices according to claim 10, it is characterised in that described service path is built
Protection attribute is carried in vertical request, described protection attribute indicate set up service path be duty or
Guard mode, and protected mode when being guard mode；
Described message control module, is additionally operable to be sent to a plurality of service path calculated and protection attribute
The first node of described service path.
14. business control devices according to claim 10, it is characterised in that described service path is built
Carrying extension link attribute in vertical request, described extension link attribute indicates that set up service path forms chain
Road；
Described message control module, is additionally operable to be sent to described extension link attribute the head of described service path
Node.
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|---|---|---|---|
| CN201510355134.XA CN106330695B (en) | 2015-06-24 | 2015-06-24 | Service control method and device |
| PCT/CN2016/082269 WO2016206502A1 (en) | 2015-06-24 | 2016-05-16 | Service control method and apparatus, and computer storage medium |
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|---|---|---|---|
| CN201510355134.XA CN106330695B (en) | 2015-06-24 | 2015-06-24 | Service control method and device |
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| CN106330695B CN106330695B (en) | 2021-03-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110392318A (en) * | 2019-07-29 | 2019-10-29 | 烽火通信科技股份有限公司 | The method of calibration and system in the channel plane layer LSP are controlled in ASON |
| CN112337099A (en) * | 2020-10-27 | 2021-02-09 | 腾讯科技（北京）有限公司 | Service management method and device |
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| WO2016206502A1 (en) | 2016-12-29 |
| CN106330695B (en) | 2021-03-02 |
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