CN101459565A - 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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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 (Synchronous Digital Hierarchy)) 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 kinds of two fine and 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 finished the fault generation is switched, and makes service outage duration less than 50ms.
ASON (Automatically Switched Optical Network ASON) introduces control plane by 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 PathFirst-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; SNCP with the conventional transmission network; protection mechanism combinations such as multiplex section protection can provide as permanent 1+1 protection flexible automaticly; 1+1 protection adds recovery; multiplex section protection adds recovery; dynamic heavy-route; unprotect; kinds of protect and the business of recovering type such as extra traffic.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 enabling 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 mistakenly.And on the other hand, when multiplex section protection can't be protected business and cause service disconnection under some network failure situation, then need in time to 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 in the professional positive direction of professional end-node and the professional opposite direction of first node; by 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 may be because the last call business signal of first and last node itself just has alarm, for preventing the wrong heavy-route of initiating, just needing to adopt certain time-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 described business judges according to the ring topology and 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, then triggered the described business of rerouting recovering.
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 triggering the described business of rerouting recovering when the described Multiplex Section Shared Protection Ring of judgment unit judges lost efficacy.
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 that is used for the described Multiplex Section Shared Protection Ring of ring information calculations that reports according to described Automatic Protection Switching Control, and be used for topological according to described ring, that described 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 triggering the rerouting recovering business when judging that described Multiplex Section Shared Protection Ring lost efficacy.
As can be seen from the above technical solutions; the first node of embodiment of the invention label switched path is according to the ring topology of described ring APS state information and acquisition; port alarm status information; judge whether Multiplex Section Shared Protection Ring lost efficacy; if lost efficacy; trigger the described business of rerouting recovering; can allow the business of having used MSP-ring can judge accurately and timely under situations such as manual operation or network failure whether MSP-ring lost efficacy; and trigger heavy-route and recover professional as early as possible, avoid time-delay or judge mistakenly 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 schematic diagram that Fig. 4 provides for the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
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 has increased the mutual of the path control deivce in the APS controller (Automatic Protection Switching Control) and control plane and signaling controller in the transport plane newly; 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 provides of the embodiment of the invention 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 described business judges according to the ring topology and 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, then triggered the described business of rerouting recovering.
Obtain the topological ring information that is specially according to Multiplex Section Shared Protection Ring of described ring, make up the ring topology of described Multiplex Section Shared Protection Ring, it specifically comprises:
The Automatic Protection Switching Control of node reports described ring information the path control deivce of this node;
The path control deivce of node arrives whole routed domain by the described ring information of expansion route protocol flooding;
The path computing device of node makes up the ring topology of described Multiplex Section Shared Protection Ring according to all described 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 kinds of two fine and 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 Shared Protection Rings, and the link period in different Multiplex Section Shared Protection Rings also can be different.As 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, by 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, link exchange capacity, information such as protection type and bandwidth.Therefore need expansion OSPF-TE agreement to come inundation ring information.
A kind of feasible protocol extension method is to increase new SubTLV object under the top layer Link TLV of TE LSA bag, 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 by OSPF inundation mechanism; just can construct the ring topology of complete Multiplex Section Shared Protection Ring; each which link is made 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 signaling controller to this node with detected described ring APS state information;
The signaling controller of node is searched the label switched path through described node;
The Notify message that the signaling controller of node uses expansion is announced first node to described label switched path with described ring APS state information.
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 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 announced this node west to being in normal state with the east orientation section to the signaling controller of node.
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 (LabelSwitched 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 this section point detects; 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 herein.
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) 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 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 triggering the described business of rerouting recovering when the described Multiplex Section Shared Protection Ring of judgment unit judges lost efficacy.
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 described Multiplex Section Shared Protection Ring;
Described construction unit specifically comprises: Automatic Protection Switching Control, path control deivce, path computing device, and described Automatic Protection Switching Control is used for reporting described ring information to described path control deivce; Described path control deivce is used for by the described ring information of expansion route protocol flooding to whole routed domain; Described path computing device is used for making up the ring topology of described Multiplex Section Shared Protection Ring according to all described ring information.
Described acquiring unit specifically comprises:
Automatic Protection Switching Control, signaling controller, described Automatic Protection Switching Control announces detected described ring APS state information to described signaling controller; Described signaling controller is searched the label switched path through described node, and uses the Notify message of expansion that described ring APS state information is announced to described 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 that is used for the described Multiplex Section Shared Protection Ring of ring information calculations that reports according to described Automatic Protection Switching Control, and be used for topological according to described ring, that described 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 triggering the described business of rerouting recovering when judging that described Multiplex Section Shared Protection Ring lost efficacy.
The network node of the embodiment of the invention also comprises:
Path control deivce, the ring information that is used for described Automatic Protection Switching Control is reported arrives whole routed domain by the expansion route protocol flooding;
Signaling controller, the APS information searching that is used for reporting according to described Automatic Protection Switching Control passes through the label switched path of described network node, and uses the described ring APS of the Notify message announcement state information of expansion.
As can be seen from the above technical solutions; the first node of embodiment of the invention label switched path is according to the ring topology of described ring APS state information and acquisition; port alarm status information; judge whether Multiplex Section Shared Protection Ring lost efficacy; if lost efficacy; trigger the described business of rerouting recovering; can allow the business of having used MSP-ring can judge accurately and timely under situations such as manual operation or network failure whether MSP-ring lost efficacy; and trigger heavy-route and recover professional as early as possible, avoid time-delay or judge mistakenly 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 being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1, a kind of restoration methods of 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 described business judges according to the ring topology and 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, then triggered the described business of rerouting recovering.
2, the method for claim 1 is characterized in that, obtains described ring topology and is specially:
According to the ring information of described Multiplex Section Shared Protection Ring, make up the ring topology of described Multiplex Section Shared Protection Ring.
3, will go 2 described methods as right, it is characterized in that, the ring topology of the described Multiplex Section Shared Protection Ring of described structure specifically comprises:
The Automatic Protection Switching Control of node reports described ring information the path control deivce of this node;
The path control deivce of node arrives whole routed domain by the described ring information of expansion route protocol flooding;
The path computing device of node makes up the ring topology of described Multiplex Section Shared Protection Ring according to all described ring information.
4, method as claimed in claim 3 is characterized in that, described expansion Routing Protocol is to increase the Sub TLV object that comprises described ring information under the top layer Link TLV of TE LSA bag.
5, as claim 2,3 or 4 described methods, it is characterized in that, described ring information comprise node on ring node number and the east orientation of ring and west to port.
6, the method for claim 1 is characterized in that, the ring APS state information that the first node of described business obtains the Multiplex Section Shared Protection Ring of this business process specifically comprises:
The Automatic Protection Switching Control of node is announced signaling controller to this node with detected described ring APS state information;
The signaling controller of node is searched the label switched path through described ring;
The Notify message that the signaling controller of node uses expansion is announced first node to described label switched path with described ring APS state information.
7, method as claimed in claim 6 is characterized in that, the first node that the signaling controller of node uses the Notify message of expansion that described ring APS state information is announced to described label switched path specifically comprises:
Increase the new object APS_SPEC that comprises described ring APS state information; give described first node with described new object and the ERROR_SPEC object that comprises port alarm status information by a Notify message announcement, perhaps give described first node by the independent announcement of Notify message described new object.
8, as claim 1,6 or 7 described methods, it is characterized in that:
When node is in exchange state, the west that described ring APS state information is described node to the port numbers of two sections of east orientation and protection switch status;
When node is not a local address from a destination address that is in the major diameter K byte that normal state section direction receives, 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 described node is a normal state to the protection switch status with the east orientation section.
9, the method for claim 1 is characterized in that, described first node is according to ring topology, the port alarm status information of described ring APS state information and acquisition, 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 described 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 described 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; have at least the active link and the protection of a section all 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.
10, a kind of 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 triggering the described business of rerouting recovering when the described Multiplex Section Shared Protection Ring of judgment unit judges lost efficacy.
11, device as claimed in claim 10 is characterized in that, also comprises:
Construction unit is used for the ring information according to described Multiplex Section Shared Protection Ring, makes up the ring topology of described Multiplex Section Shared Protection Ring.
12, device as claimed in claim 11 is characterized in that, described construction unit specifically comprises: Automatic Protection Switching Control, path control deivce, path computing device,
Described Automatic Protection Switching Control is used for reporting described ring information to described path control deivce;
Described path control deivce is used for by the described ring information of expansion route protocol flooding to whole routed domain;
Described path computing device is used for making up the ring topology of described Multiplex Section Shared Protection Ring according to all described ring information.
13, device as claimed in claim 10 is characterized in that, described acquiring unit specifically comprises: Automatic Protection Switching Control, signaling controller,
Described Automatic Protection Switching Control announces detected described ring APS state information to described signaling controller;
Described signaling controller is searched the label switched path through described ring, and uses the Notify message of expansion that described ring APS state information is announced to described judging unit.
14, a kind of 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 that is used for the described Multiplex Section Shared Protection Ring of ring information calculations that reports according to described Automatic Protection Switching Control, and be used for topological according to described ring, that described 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 triggering the rerouting recovering business when judging that described Multiplex Section Shared Protection Ring lost efficacy.
15, network node as claimed in claim 14 is characterized in that, also comprises:
Path control deivce, the ring information that is used for described Automatic Protection Switching Control is reported arrives whole routed domain by the route protocol flooding of expanding;
Signaling controller, the APS information searching that is used for reporting according to described Automatic Protection Switching Control passes through the label switched path of described network node, and uses the described ring APS of the Notify message announcement state information of expansion.
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| CN103262481B (en) * | 2010-12-17 | 2016-03-16 | 思科技术公司 | Dynamic heavy-route scheduling in directed acyclic graph (DAG) |
| WO2011157130A3 (en) * | 2011-05-31 | 2012-04-26 | 华为技术有限公司 | Path establishment method and apparatus |
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| WO2011157130A2 (en) * | 2011-05-31 | 2011-12-22 | 华为技术有限公司 | Path establishment method and apparatus |
| CN102204190A (en) * | 2011-05-31 | 2011-09-28 | 华为技术有限公司 | A path creation method and a device thereof |
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| CN110086715B (en) * | 2014-02-13 | 2022-07-22 | 华为技术有限公司 | Network path calculation method, device and system |
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| 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 |
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| 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 |
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