CN101459565B - Recovery method, device and network node for multiplexing protection service - Google Patents
Recovery method, device and network node for multiplexing protection service Download PDFInfo
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- CN101459565B CN101459565B CN2007101250606A CN200710125060A CN101459565B CN 101459565 B CN101459565 B CN 101459565B CN 2007101250606 A CN2007101250606 A CN 2007101250606A CN 200710125060 A CN200710125060 A CN 200710125060A CN 101459565 B CN101459565 B CN 101459565B
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Abstract
The embodiment of the invention provides a method, a device and a network node for restoring multiplex section protection business, wherein an initial node of a business obtains ring automatically-protected reverse state information of a multiplex section sharing protection ring where the business passes through, the initial node of the business judges whether the multiplex section sharing protection ring fails or not according to the ring automatically-protected reverse state and the obtained ring topology and port alarm state information, and if the multiplex section sharing protection ring fails, and then, a rerouting is triggered to recover the business. The rerouting can be rapidly and accurately triggered in time through the method, the device and the network node of the invention.
Description
Technical field
The present invention relates to the optical-fiber network technology, particularly a kind of restoration methods of multiplexing protection service, device and network node.
Background technology
SDH (Synchronous Digital Hierarchy SDH) is the present optical transport technology of the maturation of extensive use, and in the SDH technology, Multiplex Section Shared Protection Ring is the most representative technology in the SDH network protection mechanism.Multiplex Section Shared Protection Ring is divided into two fine and two kinds of four fibres again, and the four fiber complex section ring is except ring protection, but supporting area segment protect also.Multiplex Section Shared Protection Ring is to use APS (Automatic Protection Switching APS) agreement the protection that encircles when upward each node cooperative work is accomplished the fault generation is switched, and makes service outage duration less than 50ms.
ASON (Automatically Switched Optical Network ASON) introduces control plane through transmitting between plane and the management plane at traditional optical-fiber network; Used IP-based LMP (Link Management Protocol LMP Link Manager Protocol); OSPF-TE (Open Shortest Path First-Traffic Engineering ospf-traffic engineering) and RSVP-TE (Resource Reservation Protocol-Traffic Engineering RSVP-traffic engineering) agreement; Thereby have automatic neighbours, automatic link and automatic topological discover function; And utilize the dynamic rerouting mechanism (Restoration Mechanism) of control plane; Combine with protection mechanisms such as the SNCP of conventional transmission network, multiplex section protections, can provide like permanent 1+1 protection, 1+1 protection to add the business that recoverys, multiplex section protection add kinds of protect such as recoverys, dynamic heavy-route, unprotect, extra traffic and recovery type flexible automaticly.Carrying out the mechanism that rerouting recovering adopts among the ASON during service disconnection is; The node detection port alarm of professional process; Detect the alarm back and send the heavy-route process that the signaling Notify message that includes influenced business information triggers business, thereby recover interrupted service automatically apace to the first node of business.
ASON is applied to (equally also can be applicable to OTN) behind the SDH, the problem of how coordinating with regard to the recovery of the protection that has the SDH layer and ASON control plane layer.Because if both use simultaneously, will waste resource conservation.Because the protection of SDH layer can be accomplished to switch less than the protection of 50ms; And generally need ms up to a hundred based on the recovery of ASON control plane; So two-layer coordination strategy is the protection of carrying out the SDH layer earlier, if the Restoration Mechanism of launching the ASON control plane was again lost efficacy in the protection of SDH layer.So, in this case, need accomplish when multiplex section protection works, can not trigger rerouting recovering by error.And on the other hand, when multiplex section protection under some network failure situation, can't protect business and when causing service disconnection then needs in time trigger rerouting recovering, minimize service outage duration.
Wherein crucial judgement of losing efficacy in the protection of SDH layer, present existing implementation method are to adopt the sense channel alarm and delay the method that 50ms announces channel alarm again.Because general SDH protection meeting is worked in 50ms; If SDH protects inefficacy; Can there be other alarm of channel level in business; So just can be at the professional positive direction of professional end-node and first node in the other direction professional, through the sense channel alarm whether continue 50ms with on judge whether business interrupts, thereby trigger professional heavy-route.
But this method at first can cause the time-delay of 50ms; Secondly, under the situation of no multiplex section pressing function, also possibly can't handle multiplex section protection exchanging and make professional wrong the company and do not have channel alarm, but professional actual situation of having interrupted; At last; Because the service channel alarm possibly be because the last call business signal of first end-node itself just has alarm; For preventing the wrong heavy-route of initiating, just needing to adopt certain delay or testing mechanism to judge whether is to go up the channel alarm that the call business signal fault causes, this can cause again judging and postpone.
Summary of the invention
The embodiment of the invention provides a kind of restoration methods, device and network node of multiplexing protection service, can in time trigger heavy-route rapidly and accurately.
The embodiment of the invention provides a kind of restoration methods of multiplexing protection service, comprising:
Professional first node obtains the ring APS state information of the Multiplex Section Shared Protection Ring of this business process; The first node of said business judges according to the ring topology and the port alarm status information of described ring APS state information and acquisition whether said Multiplex Section Shared Protection Ring lost efficacy; If lost efficacy, then triggered the described business of rerouting recovering;
Obtaining said ring topology is specially: according to the ring information of said Multiplex Section Shared Protection Ring, make up the ring topology of said Multiplex Section Shared Protection Ring;
The ring topology of the said Multiplex Section Shared Protection Ring of said structure specifically comprises:
The Automatic Protection Switching Control of node is given said ring information reporting the path control deivce of this node;
The path control deivce of node arrives whole routed domain through the said ring information of expansion route protocol flooding;
The path computing device of node makes up the ring topology of said Multiplex Section Shared Protection Ring according to all said ring information.
The embodiment of the invention also provides a kind of device of realizing that multiplexing protection service recovers, comprising:
Acquiring unit is used to obtain the ring APS state information of the Multiplex Section Shared Protection Ring of this business process;
Judging unit is used for, port alarm status information topological according to described ring APS state information and ring, judges whether described Multiplex Section Shared Protection Ring lost efficacy;
Recovery unit is used for when the described Multiplex Section Shared Protection Ring of judgment unit judges lost efficacy, triggering the described business of rerouting recovering;
Also comprise: construction unit, be used for ring information according to said Multiplex Section Shared Protection Ring, make up the ring topology of said Multiplex Section Shared Protection Ring;
Described construction unit specifically comprises: Automatic Protection Switching Control, path control deivce, path computing device,
Said Automatic Protection Switching Control is used for reporting said ring information to said path control deivce;
Said path control deivce is used for through the said ring information of expansion route protocol flooding to whole routed domain;
Said path computing device is used for according to all said ring information, makes up the ring topology of said Multiplex Section Shared Protection Ring.
The embodiment of the invention also provides a kind of network node, comprising:
Automatic Protection Switching Control is used to report the ring information and the APS information of Multiplex Section Shared Protection Ring;
The path computing device; The ring topology of the said Multiplex Section Shared Protection Ring of ring information calculations that is used for reporting according to said Automatic Protection Switching Control; And be used for topological according to said ring, that said Automatic Protection Switching Control reports APS information and port alarm status information, judge whether described Multiplex Section Shared Protection Ring lost efficacy;
The traffic engineering manager is used for when judging that described Multiplex Section Shared Protection Ring lost efficacy, and it is professional to trigger rerouting recovering.
Can find out by above technical scheme; The first node of embodiment of the invention label switched path is according to ring topology, the port alarm status information of described ring APS state information and acquisition; Judge whether Multiplex Section Shared Protection Ring lost efficacy; If lost efficacy, trigger the described business of rerouting recovering, can let the business of having used MSP-ring can judge accurately and timely under situation such as manual operation or network failure whether MSP-ring lost efficacy; And trigger heavy-route and come to recover as early as possible professional, avoid time-delay or judge by error causing service outage duration to prolong.
Description of drawings
The system functional block diagram of the ASON node that Fig. 1 provides for the embodiment of the invention;
The method flow diagram that Fig. 2 provides for the embodiment of the invention;
Fig. 3 is the logical model figure of Multiplex Section Shared Protection Ring on the node;
The device sketch map that Fig. 4 provides for the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, describe the present invention below in conjunction with accompanying drawing and specific embodiment.
Be illustrated in figure 1 as the system functional block diagram of ASON node.The dashdotted left side belongs to the control plane layer among the figure, and dashdotted the right belongs to the transport plane layer.The port that control plane reports according to transport plane is alarmed and triggered heavy-route is present existing mechanism; The embodiment of the invention increased newly the path control deivce in the APS controller (Automatic Protection Switching Control) and control plane and signaling controller in the transport plane alternately; To encircle information announcement and give path control deivce, will encircle APS state (ring APS state information) announcement and give signaling controller.
As shown in Figure 2, the method that the embodiment of the invention provides mainly comprises: professional first node obtains the ring APS state information of the Multiplex Section Shared Protection Ring of this business process; The first node of said business judges according to the ring topology and the port alarm status information of described ring APS state information and acquisition whether said Multiplex Section Shared Protection Ring lost efficacy; If lost efficacy, then triggered the described business of rerouting recovering.
Obtain described ring topology and be specially the ring information according to Multiplex Section Shared Protection Ring, make up the ring topology of said Multiplex Section Shared Protection Ring, it specifically comprises:
The Automatic Protection Switching Control of node is given said ring information reporting the path control deivce of this node;
The path control deivce of node arrives whole routed domain through the said ring information of expansion route protocol flooding;
The path computing device of node makes up the ring topology of said Multiplex Section Shared Protection Ring according to all said ring information.
The Automatic Protection Switching Control of node (APS controller) will report the ring information of Multiplex Section Shared Protection Ring to the path control deivce of this node.Multiplex Section Shared Protection Ring has two fine and two kinds of four fibres, and on Multiplex Section Shared Protection Ring, each node has a unique link period, value from 0 to 15.Each physical node can belong to a plurality of different multiplex section protection rings, and the link period in different Multiplex Section Shared Protection Rings also can be different.Like Fig. 3 is the logical model figure of Multiplex Section Shared Protection Ring on the node, and for two-fiber MS shared protection ring, ring information comprises that the west is to port and east orientation port corresponding relation and link period; For the four fiber complex section protection rings, ring information comprises the corresponding relation of west to work and protection port and east orientation work and protection port, and the link period.
After the path control deivce of node is known ring information, through the ring information of route protocol flooding Multiplex Section Shared Protection Ring, so that each node can both be known all ring information.At present among the OSPF-TE of standard an inundation TE Link information, comprise local node and port and the distant-end node and the port of link, the link exchange capacity is protected information such as type and bandwidth.Therefore need expansion OSPF-TE agreement to come inundation ring information.
A kind of feasible protocol extension method is under the top layer Link TLV of TE LSA bag, to increase new SubTLV object, comprises local central port type (two is fine western fine western to protection/four fine east orientation protections to work/four fine east orientation work/four to the fine west of/two fine east orientations/four), ring antithesis port, ring protection group port (two fiber complex sections do not have) and link period information.After certain ASON node is received all TE Link information that comprises ring information through OSPF inundation mechanism; Just can construct the ring topology of complete Multiplex Section Shared Protection Ring; Each which link is made up of to know building ring and guard ring, and the link period (address) of each node on ring.
The embodiment of the invention also can adopt the method for other expansion Routing Protocols to comprise described ring information.
The ring APS state information that professional first node obtains the Multiplex Section Shared Protection Ring of this business process specifically comprises: the Automatic Protection Switching Control of node is announced the signaling controller to this node with detected said ring APS state information;
The signaling controller of node is searched the label switched path through said node;
The signaling controller of node uses the Notify message of expansion that said ring APS state information is announced the first node to said label switched path.
Each node on the Multiplex Section Shared Protection Ring all has three kinds of states, is respectively Idle state, straight-through attitude and exchange state.Correspondingly; Each section on the ring also has certain protection switch status (APS state), and the abnormal condition that the control plane rerouting recovering need be judged comprises protection lock stationary state (LP-S/SF-P), forces span switching attitude (FS-S), Signal Fail ring switching attitude (FS-R), Signal Fail span switching attitude (SF-S), Signal Fail ring switching attitude (SF-R).
The Automatic Protection Switching Control of node (APS controller) is announced the signaling controller to this node with detected ring APS state information; Concrete; When node is in exchange state; The ASP controller of node to report to the signaling controller of node the west adjacent with node to the state of two sections of east orientation, content comprise the west to or the port numbers and the APS state of east orientation section; If node is not a local link period (local address) from the purpose link period (destination address) of the major diameter K byte that certain section (this moment, this section was a normal state) direction is received; And when the bridge request codes in the K byte is protection locking/inefficacy, Forced Switch, Signal Fail; The APS controller of node will report relevant information to the signaling controller of node, and content comprises bridge request codes, purpose link period, the source link period of K byte; When node when exchange state returns Idle state or straight-through attitude, the ASP controller of node will be to this node west of signaling controller announcement of node to being in normal state with the east orientation section.
After the signaling controller of node is received the ring APS state information of APS controller report of node; Search through the west of the ring of this node to or the LSP (Label Switched Path label switched path) of the active link of two sections of east orientation, and comprise the Notify signaling message of ring APS state information to the first node announcement of LSP.
A kind of method of feasible expansion Notify message is to increase new object APS_SPEC; In order to comprise the ring APS state information that above-mentioned node detection arrives; This object can be announced the first node of giving LSP with the ERROR_SPEC object that comprises port alarm status information in a Notify message, also can announce separately.
Described port alarm status information be advertised as prior art, repeat no more here.
Described first node judges according to ring topology, the port alarm status information of described ring APS state information and acquisition whether described Multiplex Section Shared Protection Ring lost efficacy, if lost efficacy, triggers the described business of rerouting recovering.
Concrete; The signaling controller of the first node of LSP is received the traffic engineering manager that is transmitted to first node after the Notify message; Port alarm status information that the traffic engineering manager is relevant with this LSP and ring APS state information are passed to the path computing device of first node, and the path computing device of first node judges according to these information whether the multiplex section ring of LSP process protects inefficacy.
For certain two-fiber MS shared protection ring, the condition that satisfies the multiplex section protection inefficacy is any in the following condition:
1) there is at least one section to be in SF-R or FS-R switch status in the loop chain road of LSP process, and
And LSP does not have at least a section to be in SF-R or FS-R switch status in the loop chain road of process.
2) have the link of at least one section to be in the SF alarm status in the loop chain road of LSP process, and any section is in the LP-S/SF-P state in the ring.
For certain four fiber complex section protection rings, the condition that satisfies the multiplex section protection inefficacy is any in the following condition:
1) have at least one section to be in SF-R or FS-R switch status in the loop chain road of LSP process, and LSP does not have at least a section to be in SF-R or SF-S or FS-R or FS-S switch status in the loop chain road of process.
2) have at least the active link of a section to be in the SF alarm status in the loop chain road of LSP process, and this section is in the LP-S/SF-P state.
3) have at least the active link of a section and protection all to be in the SF alarm status in the loop chain road of LSP process, and any section is in the LP-S/SF-P state in the ring.
When two fine rings or 4F Ring satisfy in each self-shield failure condition any one, the traffic engineering manager of the first node of LSP will trigger the LSP that does not obtain multiplex section protection and carry out rerouting recovering.
The ASON of SDH describes though the method for the embodiment of the invention is based on, and can be applicable to the field that transport plane has the share protect ring function that adopts the APS agreement equally, comprises the ASON based on WDM and OTN.
As shown in Figure 4, the embodiment of the invention also provides a kind of device of realizing that multiplexing protection service recovers, comprising:
Acquiring unit is used to obtain the ring APS state information of the Multiplex Section Shared Protection Ring of this business process;
Judging unit is used for, port alarm status information topological according to described ring APS state information and ring,, judge whether described Multiplex Section Shared Protection Ring lost efficacy;
Recovery unit is used for when the described Multiplex Section Shared Protection Ring of judgment unit judges lost efficacy, triggering the described business of rerouting recovering.
Described device also comprises construction unit, is used for the ring information according to Multiplex Section Shared Protection Ring, makes up the ring topology of said Multiplex Section Shared Protection Ring;
Described construction unit specifically comprises: Automatic Protection Switching Control, path control deivce, path computing device, and said Automatic Protection Switching Control is used for reporting said ring information to said path control deivce; Said path control deivce is used for through the said ring information of expansion route protocol flooding to whole routed domain; Said path computing device is used for according to all said ring information, makes up the ring topology of said Multiplex Section Shared Protection Ring.
Described acquiring unit specifically comprises:
Automatic Protection Switching Control, signaling controller, said Automatic Protection Switching Control announces detected said ring APS state information to said signaling controller; Said signaling controller is searched the label switched path through said node, and uses the Notify message of expansion that said ring APS state information is announced to said judging unit.
The embodiment of the invention also provides a kind of network node, comprising:
Automatic Protection Switching Control is used to report the ring information and the APS information of Multiplex Section Shared Protection Ring;
The path computing device; The ring topology of the said Multiplex Section Shared Protection Ring of ring information calculations that is used for reporting according to said Automatic Protection Switching Control; And be used for topological according to said ring, that said Automatic Protection Switching Control reports APS information and port alarm status information, judge whether described Multiplex Section Shared Protection Ring lost efficacy;
The traffic engineering manager is used for when judging that described Multiplex Section Shared Protection Ring lost efficacy, triggering the described business of rerouting recovering.
The network node of the embodiment of the invention also comprises:
Path control deivce, the ring information that is used for said Automatic Protection Switching Control is reported arrives whole routed domain through the expansion route protocol flooding;
Signaling controller, the APS information searching that is used for reporting according to said Automatic Protection Switching Control passes through the label switched path of said network node, and uses the described ring APS of the Notify message announcement state information of expansion.
Can find out by above technical scheme; The first node of embodiment of the invention label switched path is according to ring topology, the port alarm status information of described ring APS state information and acquisition; Judge whether Multiplex Section Shared Protection Ring lost efficacy; If lost efficacy, trigger the described business of rerouting recovering, can let the business of having used MSP-ring can judge accurately and timely under situation such as manual operation or network failure whether MSP-ring lost efficacy; And trigger heavy-route and come to recover as early as possible professional, avoid time-delay or judge by error causing service outage duration to prolong.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the restoration methods of a multiplexing protection service is characterized in that, comprising:
Professional first node obtains the ring APS state information of the Multiplex Section Shared Protection Ring of this business process; The first node of said business judges according to the ring topology and the port alarm status information of described ring APS state information and acquisition whether said Multiplex Section Shared Protection Ring lost efficacy; If lost efficacy, then triggered the described business of rerouting recovering;
Obtaining said ring topology is specially: according to the ring information of said Multiplex Section Shared Protection Ring, make up the ring topology of said Multiplex Section Shared Protection Ring;
The ring topology of the said Multiplex Section Shared Protection Ring of said structure specifically comprises:
The Automatic Protection Switching Control of node is given said ring information reporting the path control deivce of this node;
The path control deivce of node arrives whole routed domain through the said ring information of expansion route protocol flooding;
The path computing device of node makes up the ring topology of said Multiplex Section Shared Protection Ring according to all said ring information.
2. the method for claim 1 is characterized in that, said expansion Routing Protocol is under the top layer Link TLV of TE LSA bag, to increase the Sub TLV object that comprises said ring information.
3. according to claim 1 or claim 2 method is characterized in that, the east orientation that described ring information comprises the node number of node on ring and ring with western to port.
4. the method for claim 1 is characterized in that, the ring APS state information that the first node of said business obtains the Multiplex Section Shared Protection Ring of this business process specifically comprises:
The Automatic Protection Switching Control of node is announced the signaling controller to this node with detected said ring APS state information;
The signaling controller of node is searched the label switched path through said ring;
The signaling controller of node uses the Notify message of expansion that said ring APS state information is announced the first node to said label switched path.
5. method as claimed in claim 4 is characterized in that, the first node that the signaling controller of node uses the Notify message of expansion that said ring APS state information is announced to said label switched path specifically comprises:
Increase the new object APS_SPEC that comprises said ring APS state information; Give described first node with said new object and the ERROR_SPEC object that comprises port alarm status information through a Notify message announcement, perhaps give described first node through the independent announcement of Notify message said new object.
6. like claim 1,4 or 5 described methods, it is characterized in that:
When node is in exchange state, the west that described ring APS state information is said node to the port numbers of two sections of east orientation and protection switch status;
When node from one be in the major diameter K byte that normal state section direction receives destination address be not local address; And when the bridge request codes in the K byte is protection locking/inefficacy, Forced Switch, Signal Fail, the bridge request codes that described ring APS state information is the K byte, purpose link period, source link period;
When node when exchange state returns Idle state or straight-through attitude, the west that described ring APS state information is said node is a normal state to the protection switch status with the east orientation section.
7. the method for claim 1 is characterized in that, described first node is according to the ring of described ring APS state information and acquisition topology, port alarm status information, judges whether described Multiplex Section Shared Protection Ring lost efficacy to be specially:
For two-fiber MS shared protection ring; There is at least one section to be in Signal Fail ring switching attitude or pressure ring switching attitude in the loop chain road of label switched path process; And described label switched path does not have at least a section to be in Signal Fail ring switching attitude in the loop chain road of process or forces the ring switching attitude; There is the link of at least one section to be in the Signal Fail alarm status in the loop chain road of perhaps described label switched path process; And when any section is in the protection lock stationary state in the ring, judge that described Multiplex Section Shared Protection Ring lost efficacy;
For the four fiber complex section protection rings; There is at least one section to be in Signal Fail ring switching attitude or Signal Fail ring switching attitude in the loop chain road of label switched path process; And described label switched path does not have at least a section to be in Signal Fail ring switching attitude or Signal Fail span switching attitude or Signal Fail ring switching attitude in the loop chain road of process or forces the span switching attitude; Have at least the active link of a section to be in the Signal Fail alarm status in the loop chain road of perhaps described label switched path process; And this section is in the protection lock stationary state; The active link that has a section in the loop chain road of perhaps described label switched path process at least all is in the Signal Fail alarm status with protection, and when any section is in the protection lock stationary state in the ring, judges that described Multiplex Section Shared Protection Ring lost efficacy.
8. a device of realizing that multiplexing protection service recovers is characterized in that, comprising:
Acquiring unit is used to obtain the ring APS state information of the Multiplex Section Shared Protection Ring of this business process;
Judging unit is used for, port alarm status information topological according to described ring APS state information and ring, judges whether described Multiplex Section Shared Protection Ring lost efficacy;
Recovery unit is used for when the described Multiplex Section Shared Protection Ring of judgment unit judges lost efficacy, triggering the described business of rerouting recovering;
Also comprise: construction unit, be used for ring information according to said Multiplex Section Shared Protection Ring, make up the ring topology of said Multiplex Section Shared Protection Ring;
Described construction unit specifically comprises: Automatic Protection Switching Control, path control deivce, path computing device,
Said Automatic Protection Switching Control is used for reporting said ring information to said path control deivce;
Said path control deivce is used for through the said ring information of expansion route protocol flooding to whole routed domain;
Said path computing device is used for according to all said ring information, makes up the ring topology of said Multiplex Section Shared Protection Ring.
9. device as claimed in claim 8 is characterized in that, described acquiring unit specifically comprises: Automatic Protection Switching Control, signaling controller,
Said Automatic Protection Switching Control announces detected said ring APS state information to said signaling controller;
Said signaling controller is searched the label switched path through said ring, and uses the Notify message of expansion that said ring APS state information is announced to said judging unit.
10. a network node is characterized in that, comprising:
Automatic Protection Switching Control is used to report the ring information and the APS information of Multiplex Section Shared Protection Ring;
The path computing device; The ring topology of the said Multiplex Section Shared Protection Ring of ring information calculations that is used for reporting according to said Automatic Protection Switching Control; And be used for topological according to said ring, that said Automatic Protection Switching Control reports APS information and port alarm status information, judge whether described Multiplex Section Shared Protection Ring lost efficacy;
The traffic engineering manager is used for when judging that described Multiplex Section Shared Protection Ring lost efficacy, and it is professional to trigger rerouting recovering.
11. network node as claimed in claim 10 is characterized in that, also comprises:
Path control deivce, the ring information that is used for said Automatic Protection Switching Control is reported arrives whole routed domain through the route protocol flooding of expanding;
Signaling controller, the APS information searching that is used for reporting according to said Automatic Protection Switching Control passes through the label switched path of said network node, and uses the described ring APS of the Notify message announcement state information of expansion.
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| CN102075415A (en) * | 2010-12-15 | 2011-05-25 | 中兴通讯股份有限公司 | Multi-element network and cross network element complex section protection switching method |
| US8937886B2 (en) * | 2010-12-17 | 2015-01-20 | Cisco Technology, Inc. | Dynamic reroute scheduling in a directed acyclic graph (DAG) |
| CN102204190B (en) * | 2011-05-31 | 2013-08-07 | 华为技术有限公司 | A path creation method and a device thereof |
| EP3099010B1 (en) * | 2014-02-13 | 2021-04-14 | Huawei Technologies Co., Ltd. | Network path computation method, apparatus and system |
| CN104917657B (en) * | 2014-03-12 | 2018-05-11 | 中国移动通信集团内蒙古有限公司 | Method, system and the network element of time slot are reused in dual node interconnection protection ring |
| CN104202176B (en) * | 2014-07-15 | 2018-08-10 | 华信咨询设计研究院有限公司 | Optical-fiber network topology computer method for auto constructing |
| WO2016165061A1 (en) * | 2015-04-14 | 2016-10-20 | 华为技术有限公司 | Service protecting method and device |
| CN107786436B (en) * | 2017-09-22 | 2020-12-01 | 烽火通信科技股份有限公司 | VPN network and protection switching method |
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