CN112804096B - Resource optimization method based on shared link risk group and electronic equipment - Google Patents
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- H—ELECTRICITY
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- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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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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Abstract
The invention discloses a resource optimization method based on a shared link risk group, which comprises the following steps: (1) thinning the link fault monitoring points, marking the OTS sections, and thinning the link fault monitoring points from the OMS sections to the OTS sections in the OMS sections; (2) associating the OTS section link monitoring point with a shared link risk group; the OMS segment refers to a link between ROADM sites, and the OTS segment refers to a link between a ROADM site and an OLA site or between two OLA sites. The method of the invention can improve the resource utilization rate, improve the switching success rate and reduce the engineering opening cost. The invention also provides corresponding electronic equipment.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a resource optimization method based on a shared link risk group and electronic equipment.
Background
A Shared Risk Link Group (SRLG) is one of Link attributes newly defined by Generalized Multiprotocol Label Switching (GMPLS), and refers to a Group of links that physically have the same Risk of failure, and if one Link fails, other links in the Group may also fail, and related links in the Group have a common Risk.
SRLG is an attribute set based on a TE (Traffic Engineering) link OMS (Optical Multiplex Section) Section; the resource management of the control plane is also based on the OMS segment, and the shared link risk group in the control plane has relevance and transitivity, that is, when a certain link in the same link risk group fails, when a new route is calculated by a WSON (Wavelength Switched Optical Network, WDM-based intelligent Optical Network), all TE link resources in the link risk group are excluded, and when two different link risk groups and TE links intersect, when one of the two link risk groups fails, all TE resources in the two link risk groups are excluded.
As shown in fig. 1, in the control plane, the conventional shared link risk group has the following problems:
OMS Section a consists of OTS (Optical Transmission Section layer) sections a1 and a2, OMS Section B consists of OTS sections B1 and B2, OMS Section C consists of OTS sections C1 and C2, OTS sections a1 is co-cabled with B1, and B2 is co-cabled with C2; based on OMS segment settings SRLG1 consists of OMS segments A and B, and SRLG2 consists of OMS segments B and C.
If the OTS segment a1 fails, B is at risk of interruption due to a and B being included in the shared link risk group SRLG 1; b and C are in shared link risk group SRLG2, so C is also at risk of interruption, both OMS section A, B and C are not available, but C is at no risk of in-line interruption with a1, and C is available.
Because the shared link risk group is based on the OMS segment, the OTS segment cannot be finely positioned: in the process of switching and establishing the channel, a large amount of available resources are eliminated, so that the resource waste is serious; when switching occurs after a fault, the possibility of path calculation failure is improved because available resources can be eliminated, and the switching success rate is low; under the requirement of service provisioning and protection of the same magnitude, due to resource waste, more links, nodes and directions need to be added in the early planning process, and the engineering provisioning cost is high.
Disclosure of Invention
Aiming at the defects or improvement requirements in the prior art, the invention provides a resource optimization method based on a shared link risk group, which solves the technical problems that OTS (optical transport system) sections cannot be finely positioned in the prior art, and a large amount of available resources are eliminated in the process of switching and establishing channels, so that the resources are wasted.
To achieve the above object, according to an aspect of the present invention, there is provided a resource optimization method based on a shared link risk group, including:
(1) thinning the link fault monitoring points, marking the OTS sections, and thinning the link fault monitoring points from the OMS sections to the OTS sections in the OMS sections;
(2) associating the OTS section link monitoring point with a shared link risk group;
the OMS segment refers to a link between ROADM sites, and the OTS segment refers to a link between a ROADM site and an OLA site or between two OLA sites.
In one embodiment of the present invention, the marking the OTS section in step (1) includes: and marking the same identification on the OTS sections belonging to the same cable of different OMS sections.
In one embodiment of the present invention, the step (2) comprises: and associating the marked OTS section link monitoring point with the SRLG based on the OMS section.
In an embodiment of the present invention, after the TE link fails or recovers, the corresponding OTS section failure information is transmitted through the OSC overhead and reported to the ROADM site.
In an embodiment of the invention, the control plane associates the OTS section information with the OMS section and the shared link risk group, the route carries associated information during flooding, and the condition of excluding the link during route calculation includes the association relationship between the OTS monitoring point information and the shared link risk link besides excluding the fault link with risk according to the shared link risk group.
In an embodiment of the present invention, the condition for excluding the link by calculating the route further includes an association relationship between the OTS monitoring point information and the shared link risk link, specifically:
and during elimination, the association relationship between the OTS monitoring point and the shared link risk group is included, and the link is only arranged under the condition that the shared link risk group is simultaneously in existence of the same cable between the fault OTS section and the OTS section of the link in the shared link risk group.
In one embodiment of the present invention, during the channel switching and returning, only the TE links in the shared link risk group associated with the OTS segment are excluded from the calculation.
In an embodiment of the present invention, the control plane obtains the corresponding relationship between the OMS segment and the OTS segment through the imported static configuration file, and sets the OTS segment identifier to the OSC at both ends of the link.
In an embodiment of the present invention, when the OTS section fails, the OSC transmits the set identification information in the corresponding direction to the OMS end station through the OSC overhead, and reports the set identification information to the control plane of the ROADM station.
According to another aspect of the present invention, there is also provided an electronic apparatus including:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method for resource optimization based on shared link risk groups of any of claims 1-9.
Generally, compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) the resource utilization rate is improved: the link risk group based on the OMS section is accurate to the state based on the OTS section, the OTS section has faults, only link resources of the same OTS section are correlated, available resources are increased, and the resource utilization rate is effectively improved;
(2) the switching success rate is improved: the method is linked with an OA (Optical Amplifier) and OSC (Optical Supervisory Channel) alarm to switch accurately to the fault point of the OTS, compared with the link risk group based on the OMS section, the method has the advantages that the number of available links is increased, and the switching success rate is greatly improved;
(3) the engineering opening cost is reduced: the link risk group based on the OMS section causes many practically available resources to be unavailable due to resource waste; the link risk group based on the OTS section can be accurately monitored, and the available resources are fully utilized; and under the requirement of service opening with the same magnitude, the equipment cost required to be invested is lower.
Drawings
FIG. 1 is an exemplary diagram of shared link groups respectively associated with an OMS segment and an OTS segment in an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a resource optimization method based on a shared link risk group according to an embodiment of the present invention;
FIG. 3 is a schematic diagram comparing an OTS section-based monitoring scheme with an OMS section-based monitoring scheme in an embodiment of the present invention;
fig. 4 is a schematic model diagram for transmitting the OTS segment identifier and the alarm to the control plane in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 2, an embodiment of the present invention provides a resource optimization method based on a shared link risk group, including:
(1) thinning the link fault monitoring points, marking the OTS sections, and thinning the link monitoring points from the OMS sections to the OTS sections in the OMS sections;
(2) associating the OTS monitoring point with a shared link risk group, for example as shown in fig. 1:
a plurality of or one OTS section forms an OMS section which has a containing relationship;
identifying the OTS section of the same cable (i.e. OTSA1 is identified the same as OTSB 1) and simultaneously associating with the SRLG based on the OMS section;
SRLG based on OMS segment: OMSA + OMSB + OMSC;
wherein:
OMSA＝OTSA1+OTSA2；
OMSB＝OTSB1+OTSB2；
OMSC＝OTSC1+OTSC2；
same-cable OTS section identification 1: OTSA1+ OTSB 1;
same-cable OTS section identification 2: OTSB2+ OTSC 2;
after the association is performed:
SRLG1：OMSA+OMSB+OTSA1+OTSB1；
SRLG2：OMSB+OMSC+OTSB2+OTSC2；
break a2, no SRLG associated with that monitoring point;
the traditional scheme is as follows: OMSA, OMSB and OMSC are not available;
the new scheme is as follows: OMSA is not available, and OMSB and OMSC are both available;
as shown in fig. 3, link monitoring points are thinned, and on the basis of monitoring the OMS section alarm, the OTS section is marked; after the TE link fails or recovers, the corresponding OTS section failure information is transmitted through the OSC overhead and reported to the ROADM site.
The control plane associates the OTS section information with the OMS section and the shared link risk group, the associated information is carried when the route is flooded (the control plane is a distributed system, the route calculation resource needs to be flooded when the route is calculated, each node knows the route calculation resource and can calculate the route according to the topology information), the condition of route calculation excluding links except for excluding the fault links with risks according to the shared link risk group when the route is calculated, the condition of route calculation excluding links also comprises the association relationship between the OTS monitoring point information and the shared link risk links (when the links are in fault, all links in the shared link risk group related to the links are excluded when the route is calculated, all links in the shared link risk group are not available, further refinement is needed on the basis, the association relationship between the OTS monitoring point and the shared link risk group when the route is excluded < please refer to establish the flow with the shared link risk group by associating the OTS monitoring point in the above >. only in the shared link risk group at the same time, and the link is removed only when the OTS section with the fault and the OTS section of the link in the shared link risk group have the same cable); therefore, when the channel is switched and returned, the route is only excluded from the TE link in the shared link risk group associated with the OTS section, and the resource utilization rate is maximized while the risk is avoided.
As shown in fig. 4, it is a model how to transmit the OTS segment id and the alarm to the control plane, where the control plane exists only on the ROADM (Reconfigurable Optical Add-Drop Multiplexer) site and there is no control plane on the OLA (Optical Line Amplifier) site. The OMS section refers to a link between ROADM sites, and the OTS section refers to a link between a ROADM site and an OLA site or between two OLA sites;
between ROADM sites there are OLA stations, ROADM1 to OLA stations is OTS section 1 and OLA stations to ROADM2 is OTS section 2.
And acquiring the corresponding relation between the OMS section and the OTS section by the control plane through the imported static configuration file. Setting OTS segment identification to OSC at two ends of the link; the net management sets the OTS identification information 1 to the OSC1< - > OSC2 at both ends of the OTS1, and sets the OTS identification information 2 to the OSC2< - > OSC3 at both ends of the OTS 2.
When the OTS section fails, the OSC needs to transmit the set identification information in the corresponding direction to the OMS end station through the OSC overhead, and report the information to the control plane of the ROADM station.
For example, the direction from OTS1 to ROADM2 is interrupted, OTS information 1 passes through the overhead of OSC, and passes through OSC2 and OSC3, and is reported to the control plane on ROADM2, and the control plane performs exclusion and comparison according to the association relationship between OTS information 1 and the shared link risk group, and when a path is finally calculated, TE link risk group resources (OMS link) associated with OTS1 are unavailable, TE link risk group resources associated with OTS2 are still available, and automatic switching and returning of a path are realized by combining OA and OSC alarm information.
(1) OTS information is set based on the OTS section, and fault association of the risk link group is carried out based on the OTS section;
OTS1 is set to OTS info 1, OTS2 is set to OTS info 2;
(2) because the control plane is based on the resource management of the TE link (OMS segment), the control plane can only work on the ROADM (sites are divided into ROADM sites and OLA sites, the OMS segment is between the ROADM sites, and the OTS segment is between the OLA sites), the ROADM sites can only monitor the alarm of the OMS segment at present, and in order to monitor the OTS segment, the fault and recovery information of the OTS segment needs to be transmitted to the ROADM sites at both ends of the OMS segment through the OSC overhead and reported on the ROADM sites. (only the OTS segment identifier is transmitted, and please refer to the detailed explanation of fig. 4 for how to transmit, the specific message format is related to the device type and belongs to the private protocol) of the FPGA;
the OTS information of the OTS segment between the links is transmitted to the receiving end of the ROADM node through the overhead of the OSC and reported, and the control plane associates the OTS information with the related shared link risk group according to the relationship between the failed or recovered OTS information and the OMS segment (given above, the OMS segment is composed of a plurality of OTS segments and can be imported through a static configuration file).
As shown in fig. 4, the direction from OTS1 to ROADM2 is interrupted, OTS information 1 is reported to the control plane on ROADM2 through OSC2 and OSC3 through the overhead of OSC, the control plane performs exclusion and comparison according to the association relationship between OTS information 1 and the shared link risk group, when path calculation is finally performed, TE link risk group resources associated with OTS1 are unavailable, TE link risk group resources associated with OTS2 are still available, and automatic switching and returning of channels are realized by combining OA and OSC alarm information.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A resource optimization method based on a shared link risk group is characterized by comprising the following steps:
(1) thinning the link fault monitoring points, marking the OTS sections, and thinning the link fault monitoring points from the OMS sections to the OTS sections in the OMS sections;
(2) associating the OTS section link monitoring point with a shared link risk group;
wherein, the OMS section refers to a link between ROADM sites, and the OTS section refers to a link between a ROADM site and an OLA site or between two OLA sites;
the control plane associates the OTS section information with the OMS section and the shared link risk group, the route carries associated information during flooding, and the condition of eliminating the link during route calculation also comprises the association relation between the OTS monitoring point information and the shared link risk link except that the fault link with the risk is eliminated according to the shared link risk group; the condition for removing the link by calculating the route further includes an association relationship between the OTS monitoring point information and the shared link risk link, and specifically includes: and during elimination, the association relationship between the OTS monitoring point and the shared link risk group is included, and the link is only arranged under the condition that the shared link risk group is simultaneously in existence of the same cable between the fault OTS section and the OTS section of the link in the shared link risk group.
2. The method for resource optimization based on shared link risk group according to claim 1, wherein the marking of OTS segments in step (1) comprises: and marking the same identification on the OTS sections belonging to the same cable of different OMS sections.
3. The method for resource optimization based on shared link risk groups according to claim 1 or 2, wherein the step (2) comprises: and associating the marked OTS section link monitoring point with the SRLG based on the OMS section.
4. The method as claimed in claim 1 or 2, wherein after the TE link fails or recovers, the corresponding OTS section failure information is transmitted through the OSC overhead and reported to the ROADM site.
5. The resource optimization method based on the shared link risk group according to claim 1, wherein during the channel switching and returning, only the TE link in the shared link risk group associated with the OTS segment is excluded from the calculation.
6. The resource optimization method based on the shared link risk group according to claim 1 or 2, wherein the control plane obtains the correspondence between the OMS segment and the OTS segment through an imported static configuration file, and sets an OTS segment identifier to the OSC at both ends of the link.
7. The method as claimed in claim 6, wherein when the OTS segment fails, the OSC transmits the set identification information of the corresponding direction to the OMS end station through an OSC overhead, and reports the set identification information to the control plane of the ROADM site.
8. An electronic device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method for resource optimization based on shared link risk groups of any of claims 1-7.
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| CN101227377A (en) * | 2007-01-17 | 2008-07-23 | 华为技术有限公司 | Method for implementing shared risk link circuit group separation crossing field path |
| CN102868563A (en) * | 2012-09-30 | 2013-01-09 | 华信邮电咨询设计研究院有限公司 | Cross layer mapping management method of share risk link group |
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| US7099286B1 (en) * | 2002-05-22 | 2006-08-29 | Cisco Technology, Inc. | Method and system for finding shared risk diverse paths |
| US7701848B2 (en) * | 2003-07-11 | 2010-04-20 | Chunming Qiao | Efficient trap avoidance and shared protection method in survivable networks with shared risk link groups and a survivable network |
| US8515280B1 (en) * | 2010-12-13 | 2013-08-20 | At&T Intellectual Property I, L.P. | Physically-diverse routing in heterogeneous optical networks |
| US10284290B2 (en) * | 2015-09-30 | 2019-05-07 | Juniper Networks, Inc. | Packet routing using optical supervisory channel data for an optical transport system |
| CN107257256B (en) * | 2017-05-03 | 2019-11-15 | 中通服咨询设计研究院有限公司 | A kind of WSON network planning plan-validation method |
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| CN101227377A (en) * | 2007-01-17 | 2008-07-23 | 华为技术有限公司 | Method for implementing shared risk link circuit group separation crossing field path |
| CN102868563A (en) * | 2012-09-30 | 2013-01-09 | 华信邮电咨询设计研究院有限公司 | Cross layer mapping management method of share risk link group |
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Effective date of registration: 20240627 Address after: 430000 No. 6, High-tech Fourth Road, Donghu High-tech Development Zone, Wuhan City, Hubei Province Patentee after: FIBERHOME TELECOMMUNICATION TECHNOLOGIES Co.,Ltd. Country or region after: China Patentee after: Wuhan Changjiang Computing Technology Co.,Ltd. Address before: 430000 No. 6, High-tech Fourth Road, Donghu High-tech Development Zone, Wuhan City, Hubei Province Patentee before: FIBERHOME TELECOMMUNICATION TECHNOLOGIES Co.,Ltd. Country or region before: China |