CN100417135C - Path selecting method of regulating link cost - Google Patents
Path selecting method of regulating link cost Download PDFInfo
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- CN100417135C CN100417135C CNB2005100691782A CN200510069178A CN100417135C CN 100417135 C CN100417135 C CN 100417135C CN B2005100691782 A CNB2005100691782 A CN B2005100691782A CN 200510069178 A CN200510069178 A CN 200510069178A CN 100417135 C CN100417135 C CN 100417135C
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Abstract
The present invention relates to a path selecting method for regulating link cost, which comprises the following steps: the link cost is regulated according to the link protection property, a preference chance of an inherent protection link is increased, and the path is solved by adopting a shortest path algorithm; a result obtained by the former step is checked, if an inherent protection mechanism at the bottom layer of a transmission network already provides perfect protection, the algorithm is over; otherwise, the algorithm is executed continuously, the link cost is regulated according to the link protection property and independent demands, the chance that the link is selected in an inherent protection link and an operating path is reduced, and a protection path which satisfies certain independent demands with the operation path is solved by adopting the shortest path algorithm; the result is compared, and the path with perfect protection is selected to be a result to return. Since the method of the present invention does not adopt a mode that a resource is deleted from topology, the routing preference strategy is embodied through regulating the link cost, and therefore, the protection path is calculated effectively, and the link with the protection mechanism is selected preferentially.
Description
Technical field
The present invention relates to a kind of method that service path is found the solution in optical-fiber network, relate in particular to service selection route method in optical-fiber network for needing protection.
Background technology
In business transmission,, be necessary for the high business transmission of the grade of service transmission path with protection is provided in order to guarantee the quality of professional transmission based on optical-fiber network.At present common implementation is utilized the intrinsic protection mechanism of optical-fiber network bottom usually, and as SDH multiplexing segment protect ring, SNCP ring, channel protection ring, and linear multiplex section protection etc. is realized the protection to business.But in actual applications, there is multiple networking mode in optical-fiber network, for example, and based on the meeting and depositing usually of the networking mode of the SDH ring network mode of multiplex section protective ring, channel protection ring and mesh network (mesh).In this case; utilize the intrinsic protection mechanism of optical-fiber network bottom may be difficult to obtain satisfied protection effect merely; therefore need solve the work and the protection path of protection each other by route selection method; under the situation of fault happens in operational; business can auto switching to the protection path, thereby guarantee professional normal transmission.When finding the solution the operating path of protection each other and protecting the path; the mode that the Internet resources that common employing comprises operating path are deleted from topology; it is lower so just to cause protecting the path to find the solution possibility of success, can't solve irrelevant to greatest extent protection path.Under above-mentioned SDH network and mesh network and the situation of depositing, how effectively to utilize the intrinsic protection mechanism of transmission network and perfect as far as possible protective capability be provided, at present not relatively effective method the two is combined.
On the other hand, traditional network path is found the solution mode, all is by the cost of webmaster according to factor static configuration transmission links such as the connection situation of network topology, link range, adopts shortest path first to calculate then.The result that shortest path first is selected is a link cost from the source node to the destination node and minimum path, therefore dynamically adjusts link cost, becomes a kind of natural optimization routing result's method.Patent GB 2379355 has described and has adjusted link cost and carry out a kind of method that route is calculated according to adjusted link cost in optical-fiber network.But how this patent not explanation should adopt the method for adjusting link cost to select service path for it, when utilizing the intrinsic resource conservation of transmission network, for business provides perfect as far as possible protection at the business that needs protection in the optical-fiber network.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The objective of the invention is to propose a kind of routing resource of adjusting link cost; in optical-fiber network by adjusting the method that link cost is the professional calculating path that needs protection; use this method can preferentially utilize the intrinsic resource conservation of optical-fiber network; can't provide under the situation of improving protection in the intrinsic protection mechanism of optical-fiber network, can calculate the operating path and the protection path of irrelevant to greatest extent protection each other effectively.
Technical scheme of the present invention is as follows:
A kind of routing resource of adjusting link cost, it comprises the following steps:
Step 1: webmaster receives the routing request, determines source node and destination node;
Step 2: the protection attribute according to link is adjusted link cost, and the chance that the link that increasing has intrinsic protection is preferred adopts the shortest path first solution path;
Step 3: the inspection step 2 is found the solution the result who obtains, if the intrinsic protection mechanism of transmission network bottom provides perfect protection, algorithm finishes; Otherwise continue execution in step four;
Step 4: the protection attribute according to link is adjusted link cost, and the chance that the link of the no intrinsic protection of increase is preferred adopts shortest path first to find the solution operating path;
Step 5: protection attribute and independence according to link require to adjust link cost, reduce to have intrinsic protection link and the selecteed chance of link that operating path comprises, adopt shortest path first to find the solution and satisfy the protection path that certain independence requires with operating path;
Step 6: the result of comparison step two and step 5, select the more perfect path of protection as a result of to return.
Described method, wherein, the process of adjusting link cost according to the link protection attribute in the described step 2 be included as the link with intrinsic protection less link cost is set, for not having the bigger link cost of link setting of intrinsic protection; And described intrinsic protected mode comprises the protection mechanism of multiplex section protective ring, channel protection ring, SNCP or linear multiplex section protection based on SDH.
Described method, wherein, the sequencing of adjusting link cost and execution shortest path first in the described step 2 is fixing.
Described method, wherein, protection attribute according to link in the described step 5 comprises that with the process that independence requires to adjust link cost the relevant link of Internet resources that comprises with operating path is set to bigger cost value, for incoherent link is provided with less cost value, for having the bigger cost value of link setting of intrinsic protection; And described independence requires to comprise: node is irrelevant, link is irrelevant, the shared risk group is irrelevant, the shared risk link group is irrelevant.
A kind of routing resource of adjusting link cost provided by the present invention, owing to do not have to adopt the mode of deletion resource from topology, but, therefore can calculate the protection path effectively by adjusting the preference strategy that link cost embodies routing; And the link of preferentially having selected to have protection mechanism, make full use of the intrinsic resource conservation of optical-fiber network bottom; For utilizing the intrinsic protection of bottom that the situation of improving protection can't be provided,, satisfied the protection demand of user to business by selecting to satisfy operating path and the protection path that independence requires as far as possible.
Description of drawings
Fig. 1 is that the routing resource of adjustment link cost of the present invention is the FB(flow block) in the service selection path that needs protection;
Fig. 2 is the topological environmental schematic diagram of a preferred embodiment of the routing resource of adjustment link cost of the present invention, wherein represents meaning to be:
A: professional source node
Z: professional destination node
A-B: link with 1+1 protection mechanism
C-Z: link with 1+1 protection mechanism
A-D, A-F, F-Z: the common link that does not have protection mechanism
B, C, D, E node: the node on the SDH multiplexing section protection rings
P1: find the solution the path that obtains for the business that needs protection
Fig. 3 is the topological environmental schematic diagram of routing resource second preferred embodiment of described adjustment link cost of the present invention, wherein represents meaning to be,
A: professional source node
Z: professional destination node
A, B: the node on the Multiplex Section Shared Protection Ring 1
E, F: the node on the Multiplex Section Shared Protection Ring 2
C, D: both on Multiplex Section Shared Protection Ring 1, the also node on Multiplex Section Shared Protection Ring 2
B-G, C-G, G-Z, F-Z, A-H, H-Z: the common link that does not have protection mechanism
P1: step 2 is found the solution the service path that obtains
P2: step 4 is found the solution the operating path that obtains
P3: step 5 find the solution obtain with the irrelevant protection path of operating path P2
Embodiment
Below in conjunction with accompanying drawing, will the concrete enforcement of technical solution of the present invention be described in further detail.
For realizing purpose of the present invention, the invention provides a kind of routing resource, its basic point of departure is: do not change topological relation, adjust link cost according to the routing demand, change shortest path first and select the possibility of each link, the preferential link of selecting to satisfy particular requirement.The inventive method comprises the following steps:
Step 1: receive the routing request, determine source node and destination node;
Step 2: the protection attribute according to link is adjusted link cost, and the chance that the link that increasing has intrinsic protection is preferred adopts the shortest path first solution path;
When adjusting link cost, for the link with intrinsic protection is provided with less link cost, is the bigger link cost of link setting that does not have intrinsic protection according to the link protection attribute.The setting that link cost value is large and small; need determine according to factors such as the link cost of webmaster static configuration and network topology scales; make shortest path first in solution procedure, can preferentially select to have the link of intrinsic protection, reach the purpose that makes full use of the intrinsic protection mechanism of transmission network.
In addition, when less link cost being set for link with intrinsic protection, can also be according to the real needs found the solution, for the link with different intrinsic protection types is provided with different cost value, thereby reach the purpose of the specific protection type of preferential selection link.Intrinsic protected mode involved in the present invention comprises protection mechanisms such as multiplex section protective ring based on SDH, channel protection ring, SNCP, linear multiplex section protection, and other various optical-fiber networks protection mechanism that may provide.
The sequencing of adjusting link cost and execution shortest path first is not what fix, can carry out preprocessing process earlier, adjust the cost of link in the topology, implement shortest path first then, also can in the process of shortest path first, adjust link cost according to the protection attribute for alternative link;
Step 3: the inspection step 2 is found the solution the result who obtains, if the intrinsic protection mechanism of transmission network bottom provides perfect protection, algorithm finishes; Otherwise continue execution in step four; Check that step 2 finds the solution the path that obtains,, so just think that protection is perfect, otherwise think the protection imperfection if every link that the path comprises all is subjected to the protection of transmission network protective underlayer mechanism;
Step 4: the protection attribute according to link is adjusted link cost, and the chance that the link of the no intrinsic protection of increase is preferred adopts shortest path first to find the solution operating path;
When adjusting link cost, for having the bigger cost value of link setting of intrinsic protection, for the link that does not have intrinsic protection is provided with less cost value according to the link protection attribute.Because wish to be professional end-to-end operating path of protecting each other and the protection path of obtaining, should avoid having the link of intrinsic protection when therefore finding the solution operating path as possible, avoid occurring intrinsic protection and the overlapping phenomenon of end-to-end protection.Same step 2, the large and small setting of link cost value herein also need to determine according to factors such as the link cost of webmaster static configuration and network topology scales, and adjust link cost and carry out that the sequencing of shortest path first neither fix.
Step 5: protection attribute and independence according to link require to adjust link cost, reduce to have intrinsic protection link and the selecteed chance of link that operating path comprises, adopt shortest path first to find the solution and satisfy the protection path that certain independence requires with operating path;
When requiring to adjust link cost according to the protection attribute of link and independence; the relevant bigger cost value of link setting of Internet resources (node, link, risk group) that comprises with operating path; for incoherent link is provided with less cost value, for having the bigger cost value of link setting of intrinsic protection.Shortest path first will be when having avoided intrinsic protection link as possible like this, and preferential the selection and the irrelevant link of operating path satisfied the protection path that independence requires thereby solve with operating path.
Described independence requirement; comprise: node is irrelevant, link is irrelevant, shared risk group SRG is irrelevant, shared risk link group SRLG is irrelevant; and do not get rid of other irrelevant forms; as long as be the bigger cost value of link setting that the Internet resources of wishing to avoid relate to, just can obtain and satisfy the protection path that independence requires.Similar with step 2, step 4, the large and small setting of link cost value also needs to determine according to factors such as the link cost of webmaster static configuration and network topology scales, adjusts link cost and carries out that the sequencing of shortest path first neither fix.
Step 6: the result of comparison step two and step 5, select the more perfect path of protection as a result of to return.
Be that the present invention is the FB(flow block) in the service selection path that needs protection as described in Figure 1, use method provided by the present invention, by adjusting link cost, changed shortest path first and selected the possibility of each link, thereby preferentially selected to satisfy the link of particular requirement; Owing to only link cost is adjusted, relevant node or link are not deleted from topology, thereby increased the routing opportunity of success simultaneously, can solve service path more effectively according to the routing demand.
With topological environmental shown in Figure 2 is example, illustrates that how the present invention makes full use of the intrinsic resource conservation of optical-fiber network bottom by adjusting link cost, is the service selection path that needs protection.Concrete handling process is:
1. according to method step one shown in Figure 1, receive routing inquiry request, the source of determining Path selection is the A node, and purpose is the Z node.
2. according to method step two shown in Figure 1, in the process that adopts shortest path first to find the solution, adjust link cost according to the protection attribute of link.For example, can carry out the adjustment of link cost, not get rid of and use other forms of method of weighting according to formula 1:
Formula 1:W=W0+ α * W1
Wherein:
W0 is the link cost of management plane static configuration, for example: 10;
α adjusts the factor, if link has intrinsic protective capability, and α=0, otherwise α=1;
W1 is the adjustment granularity of link cost, can select suitable value according to factors such as the static configuration of webmaster and network topology scales, for example: 100.
Link cost before and after adjusting, as shown in table 1:
Table 1.
If adopt aforesaid way to adjust link cost, shortest path first is found the solution the path that obtains and is so: A-B-C-Z, i.e. P1 shown in Fig. 2.
3. according to method step three shown in Figure 1; check result of calculation P1; all be subjected to the protection of the intrinsic protection mechanism of optical-fiber network bottom by link; A-B is a 1+1 protection; B-C is a multi-section shared protection, and C-Z is a 1+1 protection, finds the solution the P1 path that obtains and has made full use of the intrinsic protection mechanism of transmission network bottom; and protection is perfect, and algorithm finishes.
With topological environmental shown in Figure 3 is example, illustrates that how the present invention is that the business that needs protection is found the solution and satisfied operating path and the protection path that independence requires (node is irrelevant or link is irrelevant) by adjusting link cost.Concrete handling process is such:
1. according to method step one shown in Figure 1, receive routing inquiry request, the source of determining Path selection is the A node, and purpose is the Z node.
2. according to method step two shown in Figure 1, in the process that adopts shortest path first to find the solution, adjust link cost according to the protection attribute of link.This step is identical with the described embodiment of Fig. 2, therefore no longer describes in detail.Finding the solution the path that obtains is P1:A-D-F-Z.
3. according to method step three shown in Figure 1, check result of calculation P1, the F-Z link does not have intrinsic protection, therefore thinks that the protection in P1 path is incomplete, need further find the solution.
4. according to method step four shown in Figure 1, evaluation work path.In the process that adopts shortest path first to find the solution, adjust link cost according to the protection attribute of link.For example, can carry out the adjustment of link cost according to above-mentioned formula 1.
When application of formula 1, if link has intrinsic protective capability, α=1, otherwise α=0;
Link cost before and after adjusting, as shown in table 2:
Table 2.
If adopt aforesaid way to adjust link cost, shortest path first is found the solution the path that obtains and is so: A-H-Z, i.e. P2 shown in Fig. 3.
5. according to method step five shown in Figure 1, calculate the protection path.In the process that adopts shortest path first to find the solution, adjust link cost according to the protection attribute and the independence requirement of link.For example, can carry out the adjustment of link cost according to following formula:
Formula 2:W=W0+ α * W1+ β * W2+ γ * W3
Wherein:
W0 is the link cost of management plane static configuration, for example: 10;
α is the irrelevant factor of adjusting of node, if the first node of link or tail node are the nodes (except source node and the destination node) in the operating path, and α=1 so, otherwise α=0;
W1 is the irrelevant adjustment granularity of node, can select suitable value according to factors such as the static configuration of webmaster and network topology scales, for example: 100.
β is the irrelevant factor of adjusting of link, if link belongs to operating path, and α=1 so, otherwise α=0;
W2 is the irrelevant adjustment granularity of link, can select suitable value according to factors such as the static configuration of webmaster and network topology scales, for example: 500.
γ is that the link protection attribute is adjusted the factor, if link has intrinsic protection, and α=1, otherwise α=0;
W3 is the adjustment granularity of link protection attribute, can select suitable value according to factors such as the static configuration of webmaster and network topology scales, for example: 40.
Link cost before and after adjusting, as shown in table 3:
Table 3.
If adopt aforesaid way to adjust link cost, shortest path first is found the solution the path that obtains and is so: A-B-G-Z, i.e. P3 shown in Fig. 2.
6. according to method step six shown in Figure 1; the result that comparison step two and step 4, five calculate; be not difficult to find out; the protection of P1 and imperfection; and P2 and the P3 irrelevant path of protection each other that is two nodes; the protection more more perfect than P1 is provided, therefore P2 and P3 returned as the routing result.
Should be understood that above-mentioned description at specific embodiment is too concrete, can not therefore be interpreted as the restriction to scope of patent protection of the present invention, scope of patent protection should be as the criterion with claims.
Claims (4)
1. routing resource of adjusting link cost, it comprises the following steps:
Step 1: webmaster receives the routing request, determines source node and destination node;
Step 2: the protection attribute according to link is adjusted link cost, and the chance that the link that increasing has intrinsic protection is preferred adopts the shortest path first solution path;
Step 3: the inspection step 2 is found the solution the result who obtains, if the intrinsic protection mechanism of transmission network bottom provides perfect protection, finishes; Otherwise continue execution in step four; Described perfect protection every the link comprising of footpath that shows the way all is subjected to the protection of transmission network protective underlayer mechanism;
Step 4: the protection attribute according to link is adjusted link cost, and the chance that the link of the no intrinsic protection of increase is preferred adopts shortest path first to find the solution operating path;
Step 5: protection attribute and independence according to link require to adjust link cost, reduce to have intrinsic protection link and the selecteed chance of link that operating path comprises, adopt shortest path first to find the solution and satisfy the protection path that certain independence requires with operating path;
Step 6: the result of comparison step two and step 5, select the more perfect path of protection as a result of to return.
2. method according to claim 1, it is characterized in that, the process of adjusting link cost according to the link protection attribute in the described step 2 be included as the link with intrinsic protection less link cost is set, for not having the bigger link cost of link setting of intrinsic protection; And described intrinsic protected mode comprises the protection mechanism of multiplex section protective ring, channel protection ring, SNCP or linear multiplex section protection based on SDH.
3. method according to claim 1 is characterized in that, the sequencing of adjusting link cost and execution shortest path first in the described step 2 is fixing.
4. method according to claim 1, it is characterized in that, protection attribute according to link in the described step 5 comprises that with the process that independence requires to adjust link cost the relevant link of Internet resources that comprises with operating path is set to bigger cost value, for incoherent link is provided with less cost value, for having the bigger cost value of link setting of intrinsic protection; And described independence requires to comprise: node is irrelevant, link is irrelevant, the shared risk group is irrelevant, the shared risk link group is irrelevant.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101453352B (en) * | 2007-12-07 | 2011-04-20 | 华为技术有限公司 | Path failure detection method and apparatus |
| CN101184342B (en) * | 2007-12-19 | 2010-12-29 | 中兴通讯股份有限公司 | Method of establishing service on optical multiplex layer |
| CN101621446B (en) * | 2008-06-30 | 2011-08-24 | 华为技术有限公司 | Path computing method and device |
| CN101651600B (en) * | 2008-08-14 | 2011-11-16 | 中国移动通信集团设计院有限公司 | Method and device for updating link cost in grid network |
| CN102571401B (en) * | 2010-12-24 | 2015-07-08 | 华为技术有限公司 | Method and device for building backup path and method and device for selecting backup path |
| CN102185650A (en) * | 2011-06-09 | 2011-09-14 | 国网电力科学研究院 | Disjoint path-based ASON (Automatic Switched Optical Network) multiple fault protection method |
| CN102316390B (en) * | 2011-09-07 | 2018-03-02 | 中兴通讯股份有限公司 | The method and device of path computing efficiency under constraints is improved using virtual topology |
| CN110233796B (en) * | 2019-05-30 | 2021-12-14 | 国网山东省电力公司信息通信公司 | Power communication network optimization method and equipment based on weighted routing algorithm |
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| CN1454442A (en) * | 2000-06-29 | 2003-11-05 | Eci电信公司 | Rerouting in a multiprotocol Label switching (MPLS) domain |
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