CN103379007A - Method and device for determining protection capacity of intersecting looped network - Google Patents
Method and device for determining protection capacity of intersecting looped network Download PDFInfo
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- CN103379007A CN103379007A CN201210120250XA CN201210120250A CN103379007A CN 103379007 A CN103379007 A CN 103379007A CN 201210120250X A CN201210120250X A CN 201210120250XA CN 201210120250 A CN201210120250 A CN 201210120250A CN 103379007 A CN103379007 A CN 103379007A
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Abstract
The invention discloses a method and a device for determining the protection capacity of an intersecting looped network. According to the method, all looped networks containing active links bearing loped network services are determined, and the sum of bandwidths of all looped networks borne by an active link is calculated in terms of all active links of each looped network; when a judgment result indicates that the current protection capacity of the looped networks is smaller than the calculated sum of the bandwidths, and the current protection capacity of the looped networks is adjusted to be not smaller than the sum of the bandwidths according to the surplus bandwidth capacity of the looped networks and the sum of the bandwidths so as to achieve the purpose that all active links bearing looped network services in the intersecting looped networks are protected. Furthermore, one active link can be protected through a plurality of intersecting looped networks, and therefore the viability of looped network services in the network is improved.
Description
Technical field
The present invention relates to the planning and designing technical field of communication network, the Protection capacity that relates in particular to a kind of intersecting ring network is determined method and device.
Background technology
Packet Transport Network (PTN, Packet Transport Network) the two-way point-to-point interface channel of the multiple group-based reciprocal exchange of business of support, have and be fit to professional, the networking capability end to end of various large or fine granules, it can not only carry the carrier class Ethernet service preferably, and can take into account traditional time division multiplexing (TDM, Time-Division Multiplexing) business.In the metropolitan area network of China operator, the PTN technology mainly is positioned the Access Layer that converges of metropolitan area, the business of main carrying has: 2G/3G BTS service, group's special line and the Internet big customer be professional, such as the network (DCN of business hall Digital China, Digital China Networks) and the interior business of IPTV (IPTV), optical line terminal (OLT, Optical LineTerminal), the multiple high-quality Packet Services such as WLAN (WLAN, Wireless Local Area Networks), environmental monitoring.In case the link in the PTN network or node failure, a large number of services that transmits in the PTN network will interrupt, and causes huge loss, therefore, generally need to protect each active link of bearer service in the PTN network.
At present, mainly contain three kinds of protected modes in the PTN network: linear 1+1 protection, protection in linear 1: 1 and looped network protection.Computational methods for the protection link capacity of each active link in linear protection and the protection of non-intersecting ring network are fairly simple, for example: the network topological diagram of two non-intersecting ring network as shown in Figure 1, the circle of tape label represents node among Fig. 1, the line that connects each node represents link, and the label on the link represents the fiber count that this link comprises; Can find out, between node 2 and node 3, have two links, i.e. link a and link b, they belong to respectively two different looped networks, and namely link a belongs to looped network A (1-2-3-4-1) and link b belongs to looped network B (2-5-6-3-2).In this case; bandwidth is that the looped network business of W is through node 2 during to node 3; its active link a or active link b only belong to a looped network, then only exist a looped network that looped network business is protected through active link a or the active link b of node 2 to node 3.If the active link of this looped network business is a, then the Protection capacity of looped network A (1-2-3-4-1) is W, and the Protection capacity of looped network B (2-5-6-3-2) is 0; Otherwise if the active link of this looped network business is b, then the Protection capacity of looped network B (2-5-6-3-2) is W, and the Protection capacity of looped network A (1-2-3-4-1) is 0.
And for as shown in Figure 2 intersecting ring network, the circle of tape label represents node among Fig. 2, and the line that connects each node represents link, and the label on the link represents the fiber count that this link comprises; Can find out, have 1 link between node 2 and node 3, it belongs to two different looped networks simultaneously, i.e. looped network A (1-2-3-4-1) and looped network B (2-5-6-3-2), then looped network A and looped network B intersect at this link, and looped network A and looped network B are called intersecting ring network.In this case, bandwidth be the looped network business of W through node 2 during to node 3, its active link belongs to two looped networks, so, can use two looped networks that this active link is protected.
At present, rarelyr cross over the design that the looped network business of a plurality of intersecting ring network is protected for active link.
Summary of the invention
The embodiment of the invention provides a kind of Protection capacity of intersecting ring network to determine method and device, protects in order to be implemented in the intersecting ring network each active link to the load-carrying ring network service.
The Protection capacity of a kind of intersecting ring network that the embodiment of the invention provides is determined method, comprising:
Determine to comprise all looped networks of the active link of load-carrying ring network service;
For every active link that a looped network comprises, calculate the bandwidth sum of all looped network business that carry at described active link;
When judging the current Protection capacity of described looped network less than the described bandwidth sum that calculates, according to remaining bandwidth and the described bandwidth sum of described looped network, the Protection capacity that described looped network is current is adjusted into and is not less than described bandwidth sum.
The Protection capacity of a kind of intersecting ring network that the embodiment of the invention provides is determined device, comprising:
Determining unit is used for determining comprising all looped networks of the active link of load-carrying ring network service;
Computing unit for every the active link that comprises for a looped network, calculates the bandwidth sum of all looped network business that carry at described active link;
Judging unit is used for judging that whether the current Protection capacity of described looped network is less than the described bandwidth sum that calculates;
Adjustment unit is used in described judgment unit judges when being, according to remaining bandwidth and the described bandwidth sum of described looped network, the Protection capacity that described looped network is current is adjusted into and is not less than described bandwidth sum.
The beneficial effect of the embodiment of the invention comprises:
The Protection capacity of a kind of intersecting ring network that the embodiment of the invention provides is determined method and device, determine to comprise all looped networks of the active link of load-carrying ring network service, for every active link that a looped network comprises, calculate the bandwidth sum of all looped network business that carry at this active link; When judging the current Protection capacity of this looped network less than the bandwidth sum that calculates; remaining bandwidth capacity and bandwidth sum according to looped network; the Protection capacity that looped network is current is adjusted into and is not less than the bandwidth sum; being implemented in the intersecting ring network each active link to the load-carrying ring network service protects; and; can there be a plurality of intersecting ring network that the same active link is protected, have improved the survival ability of looped network business in network.
Description of drawings
Fig. 1 is the network topological diagram of two non-intersecting ring network in the prior art;
Fig. 2 is the network topological diagram of two intersecting ring network in the prior art;
Fig. 3 determines one of flow chart of method for the Protection capacity of the intersecting ring network that the embodiment of the invention provides;
The Protection capacity of the intersecting ring network that Fig. 4 provides for the embodiment of the invention determine method flow chart two;
The network topological diagram of the example that Fig. 5 provides for the embodiment of the invention;
The Protection capacity of the intersecting ring network that Fig. 6 provides for the embodiment of the invention is determined the structural representation of device.
Embodiment
Below in conjunction with accompanying drawing, the Protection capacity of the intersecting ring network that the embodiment of the invention is provided determines that the embodiment of method and device is described in detail.
The Protection capacity of a kind of intersecting ring network that the embodiment of the invention provides is determined method, as shown in Figure 3, specifically may further comprise the steps:
S301, determine to comprise all looped networks of the active link of load-carrying ring network service; Wherein, looped network business can be a looped network business, can be a plurality of looped network business, in this quantity of stop collar network service not;
Preferably, before execution in step S301, also comprise: looped network business is carried out route, set up the work tap switching path LSP of this looped network business, this working LSP is the set of the active link of this looped network business of carrying.
Particularly, can adopt the working LSP of existing Di jkstra shortest path first ring network service.
In the specific implementation, when having the collection of services that is made up by a plurality of looped network business, need the traversal collection of services, each looped network business is set up working LSP, then travel through the working LSP of each looped network business, to every active link in each working LSP, determine to comprise all looped networks of this active link, form the looped network set of this active link.
In the specific implementation, need to carry out following operation to each looped network in the looped network set of this active link:
S302, every the active link that comprises for a looped network calculate the bandwidth sum of all looped network business that carry at this active link;
S303, whether judge the current Protection capacity of this looped network less than the bandwidth sum that calculates, if, execution in step S304; If not, think that the current Protection capacity of this looped network need not to adjust, can protect all looped network business that carry on this active link, then turn to step S302;
S304, according to remaining bandwidth and the bandwidth sum of this looped network; the Protection capacity that looped network is current is adjusted into and is not less than the bandwidth sum, wherein, can find out; the total capacity of each looped network is a fixed value, the Protection capacity of the remaining bandwidth+looped network of the total capacity=looped network of looped network.
Particularly, can the Protection capacity that looped network is current be adjusted into and equal the bandwidth sum, also can adjust to greater than the bandwidth sum by the Protection capacity that looped network is current, do not do restriction at this.
Preferably, after execution in step S304, as shown in Figure 3, can also may further comprise the steps:
S305, the Protection capacity after adjusting according to looped network upgrade the remaining bandwidth of this looped network, the Protection capacity of the total capacity of the remaining bandwidth=looped network of looped network after namely upgrading-after looped network is adjusted.
Particularly, in remaining bandwidth and the bandwidth sum of above-mentioned steps S304 according to this looped network, the Protection capacity that looped network is current is adjusted into the detailed process that is not less than the bandwidth sum, as shown in Figure 4, can may further comprise the steps:
The difference of the Protection capacity that S401, computation bandwidth sum and looped network are current;
S402, judge whether the remaining bandwidth of looped network is not less than difference; If, execution in step S403;
S403, the Protection capacity that looped network is current are adjusted to and are not less than the bandwidth sum.
Preferably, when execution in step S402, if when the determination result is NO, as shown in Figure 4, can also may further comprise the steps:
S404, determine whether to exist other looped networks that comprise this active link except this looped network, if, execution in step S405; If not, execution in step S408;
S405, determine that whether the current Protection capacity of other looped networks is less than the bandwidth sum; If confirm further then whether the current Protection capacity of other looped networks might be adjusted to protect all looped network business that carry at this service link, execution in step S406; If not, then definite current Protection capacity of other looped networks can be protected all looped network business that carry at this service link, execution in step S409;
Whether S406, the remaining bandwidth of judging other looped networks are not less than the difference of the current Protection capacity of bandwidth sum and other looped networks; If, execution in step S407; If not, think that then the working LSP that this looped network business is set up is failed, execution in step S408;
S407, the Protection capacity that other looped networks are current are adjusted to and are not less than the bandwidth sum, can protect all looped network business that carry on this service link to guarantee other looped networks;
Further, can also upgrade the remaining bandwidth of these other looped networks according to the Protection capacity after other looped networks adjustment, the Protection capacity after the total capacity of the remaining bandwidth of other looped networks=other looped networks after namely upgrading-other looped networks adjustment.
S408, again looped network business is carried out route, the active link of change looped network business;
S409, withdraw from this flow process.
Again looped network business is carried out route at execution in step S408; after the active link of change looped network business; need to re-execute the S301～S304 in the said method that the embodiment of the invention provides, until determine in network, to exist all looped network business that at least one looped network carries active link to carry out till the looped network protection.
Definite method of the Protection capacity of the above-mentioned intersecting ring network that provides by the embodiment of the invention; can be implemented in the intersecting ring network each active link to the load-carrying ring network service protects; and; owing to can have a plurality of intersecting ring network that the same active link is protected, improve the survival ability of looped network business in network.
Further; owing to can the Protection capacity that each looped network is current be adjusted into the bandwidth sum that equals all looped network business of carrying on the claimed active link; can protect under the prerequisite of each looped network business at the Protection capacity that guarantees intersecting ring network, reduce the redundancy bandwidth on the intersecting ring network as far as possible.
The said method that the embodiment of the invention provides determines that the Protection capacity of intersecting ring network goes for the initial stage of the networking, namely in network planning process, determined each looped network business that will carry in the network each intersecting ring network in the network to be carried out Protection capacity planning; Also go for looped network business when dynamically adding network, adjusted the process of the Protection capacity of each intersecting ring network for the looped network business of new adding, do not limited the application scenarios of the intersecting ring network that the embodiment of the invention provides at this.
The below is take the Protection capacity of determining intersecting ring when building a new PTN network as example, and the said method that the embodiment of the invention is provided is described in detail, and its detailed process is as follows:
1, set up the PTN network topological diagram, as shown in Figure 5, wherein; the circle of tape label represents node, and the line that connects each node represents link, and the label on the link represents the fiber count that this link comprises; it is 0 that the initial Protection capacity of each looped network is set, and each bandwidth of an optical fiber is 10G.
2, travel through successively the collection of services that PTN network as shown in table 1 need to carry, set up the working LSP of each looped network business.For example: looped network business PW1, its active link are (1-2,2-3); Looped network business PW2, its active link are (1-2,2-8); Looped network business PW3, its active link are (1-2,2-5).
Table 1
| Traffic ID | Source node | Destination node | Traffic direction | Professional bandwidth | |
| PW1 | |||||
| 1 | 3 | Two-way | 500M | Looped | |
| PW2 | |||||
| 1 | 8 | Two-way | 300M | Looped | |
| PW3 | |||||
| 1 | 5 | Two-way | 350M | Looped network protection |
3, travel through successively the active link of each looped network business, the looped network that comprises this active link is carried out the setting of Protection capacity.
Active link (1-2) for looped network business PW1; it is 0 that the looped network that comprises this link has looped network 1 (1-2-3-4-1) and the initial Protection capacity of looped network 3 (7-8-2-1-7); all less than the bandwidth 500M of looped network business PW1, then the Protection capacity of looped network 1 (1-2-3-4-1) and looped network 3 (7-8-2-1-7) is set to 500M.In like manner, active link (2-3) for looped network business PW1, the Protection capacity that comprises the looped network 1 (1-2-3-4-1) of this link is 500M, be not less than the bandwidth 500M of looped network business PW1, think that looped network 1 (1-2-3-4-1) can protect the active link (2-3) of looped network business PW1, then the current Protection capacity of looped network 1 (1-2-3-4-1) is not adjusted; The initial Protection capacity of looped network 2 (2-5-6-3-2) that comprises this link is 0, and less than the bandwidth 500M of looped network business PW1, then the Protection capacity of looped network 2 (2-5-6-3-2) is set to 500M.
Active link (1-2) for looped network business PW2; it is 500M that the looped network that comprises this link has looped network 1 (1-2-3-4-1) and the current Protection capacity of looped network 3 (7-8-2-1-7); all less than the bandwidth sum 800M of looped network business PW1 and looped network business PW2, then the Protection capacity of looped network 1 (1-2-3-4-1) and looped network 3 (7-8-2-1-7) is set to 800M.In like manner; active link (2-8) for looped network business PW2; it is 800M that the looped network that comprises this link has the current Protection capacity of looped network 3 (7-8-2-1-7); bandwidth 300M greater than looped network business PW2; think that looped network 3 (7-8-2-1-7) can protect the active link (2-8) of looped network business PW2, then the Protection capacity of looped network 3 (7-8-2-1-7) is not adjusted.
Active link (1-2) for looped network business PW3; it is 800M that the looped network that comprises this link has looped network 1 (1-2-3-4-1) and the current Protection capacity of looped network 3 (7-8-2-1-7); all less than the bandwidth sum 1150M of looped network business PW1, looped network business PW2 and looped network business PW3, then looped network 1 (1-2-3-4-1) and the current Protection capacity of looped network 3 (7-8-2-1-7) are set to 1150M.In like manner; active link (2-5) for looped network business PW3; it is 500M that the looped network that comprises this link has the current Protection capacity of looped network 2 (2-5-6-3-2); bandwidth 350M greater than looped network business PW3; think that looped network 2 (2-5-6-3-2) can protect the active link (2-5) of looped network business PW3, then the Protection capacity of looped network 2 (2-5-6-3-2) is not adjusted.
The Protection capacity of each looped network after 4, final planning is finished is as shown in table 2.
Table 2
| Looped network ID and node | Initial capacity | Capacity after planning is finished |
| Looped network 1 (1-2-3-4-1) | 0 | 1150 |
| Looped network 2 (2-5-6-3-2) | 0 | 500 |
| Looped network 3 (7-8-2-1-7) | 0 | 1150 |
Based on same inventive concept; the embodiment of the invention also provides a kind of Protection capacity of intersecting ring network to determine device; because the principle of this device solves problem determines that to the Protection capacity of aforementioned a kind of intersecting ring network method is similar; therefore the enforcement of this device can referring to the enforcement of method, repeat part and repeat no more.
The Protection capacity of a kind of intersecting ring network that the embodiment of the invention provides is determined device, as shown in Figure 6, comprising:
Determining unit 601 is used for determining comprising all looped networks of the active link of load-carrying ring network service;
Judging unit 603 is used for judging that whether the current Protection capacity of looped network is less than the bandwidth sum that calculates;
Further, in said apparatus, as shown in Figure 6, also comprise: routing unit 605, be used for looped network business is carried out route, set up the work tap switching path LSP of looped network business, this working LSP is the set of the active link of the described looped network business of carrying.
Further, above-mentioned adjustment unit 604 specifically is used for the difference of the current Protection capacity of computation bandwidth sum and looped network; When the remaining bandwidth of judging looped network was not less than difference, the Protection capacity that looped network is current was adjusted to and is not less than the bandwidth sum.
Further; above-mentioned adjustment unit 604; also be used for when being judged as at judging unit 603 when no; determine to exist other looped networks that comprise active link except looped network; the Protection capacity of other looped networks is less than the bandwidth sum; and when the remaining bandwidth of other looped networks was not less than the difference of the current Protection capacity of bandwidth sum and other looped networks, the Protection capacity that other looped networks are current was adjusted to and is not less than the bandwidth sum.
Further; above-mentioned routing unit 605; also be used for being judged as when no at judging unit 603; determine not exist other looped networks that comprise active link except looped network; or the current Protection capacity of other looped networks that exist is less than the bandwidth sum; and the remaining bandwidth of other looped networks then carries out route to looped network business again less than the difference of the current Protection capacity of bandwidth sum and other looped networks, the active link of change looped network business.
Further, in said apparatus, as shown in Figure 6, also comprise: updating block 606, be used for the Protection capacity that looped network is current and adjust to and be not less than after the bandwidth sum, the Protection capacity after adjusting according to looped network upgrades the remaining bandwidth of looped network.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, the technical scheme of the embodiment of the invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
The Protection capacity of a kind of intersecting ring network that the embodiment of the invention provides is determined method and device, determine to comprise all looped networks of the active link of load-carrying ring network service, for every active link that a looped network comprises, calculate the bandwidth sum of all looped network business that carry at this active link; When judging the current Protection capacity of this looped network less than the bandwidth sum that calculates; remaining bandwidth capacity and bandwidth sum according to looped network; the Protection capacity that looped network is current is adjusted into and is not less than the bandwidth sum; being implemented in the intersecting ring network each active link to the load-carrying ring network service protects; and; can there be a plurality of intersecting ring network that the same active link is protected, have improved the survival ability of looped network business in network.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. the Protection capacity of an intersecting ring network is determined method, it is characterized in that, comprising:
Determine to comprise all looped networks of the active link of load-carrying ring network service;
For every active link that a looped network comprises, calculate the bandwidth sum of all looped network business that carry at described active link;
When judging the current Protection capacity of described looped network less than the described bandwidth sum that calculates, according to remaining bandwidth and the described bandwidth sum of described looped network, the Protection capacity that described looped network is current is adjusted into and is not less than described bandwidth sum.
2. the method for claim 1 is characterized in that, before all looped networks of the active link of determining to comprise the load-carrying ring network service, also comprises:
Looped network business is carried out route, set up the work tap switching path LSP of described looped network business, described working LSP is the set of the active link of the described looped network business of carrying.
3. method as claimed in claim 2 is characterized in that, according to remaining bandwidth and the described bandwidth sum of described looped network, the Protection capacity that described looped network is current is adjusted to and is not less than described bandwidth sum, specifically comprises:
Calculate the difference of the current Protection capacity of described bandwidth sum and described looped network;
When the remaining bandwidth of judging described looped network was not less than described difference, the Protection capacity that described looped network is current was adjusted to and is not less than described bandwidth sum.
4. method as claimed in claim 3 is characterized in that, also comprises:
When the remaining bandwidth of judging described looped network during less than described difference; determine to exist other looped networks that comprise described active link except described looped network; the current Protection capacity of described other looped networks is less than described bandwidth sum; and the remaining bandwidth of described other looped networks is not less than the difference of the current Protection capacity of described bandwidth sum and described other looped networks, then the current Protection capacity of described other looped networks is adjusted to and is not less than described bandwidth sum.
5. method as claimed in claim 4 is characterized in that, also comprises:
When the remaining bandwidth of judging described looped network during less than described difference; determine not exist other looped networks that except described looped network, comprise described active link; or the current Protection capacity of described other looped networks that exist is less than described bandwidth sum; and the remaining bandwidth of described other looped networks is less than the difference of the current Protection capacity of described bandwidth sum and described other looped networks; then again described looped network business is carried out route, change the active link of described looped network business.
6. such as each described method of claim 1-5, it is characterized in that the Protection capacity that described looped network is current is adjusted to and is not less than after the described bandwidth sum, also comprises:
According to the Protection capacity after the described looped network adjustment, upgrade the remaining bandwidth of described looped network.
7. the Protection capacity of an intersecting ring network is determined device, it is characterized in that, comprising:
Determining unit is used for determining comprising all looped networks of the active link of load-carrying ring network service;
Computing unit for every the active link that comprises for a looped network, calculates the bandwidth sum of all looped network business that carry at described active link;
Judging unit is used for judging that whether the current Protection capacity of described looped network is less than the described bandwidth sum that calculates;
Adjustment unit is used in described judgment unit judges when being, according to remaining bandwidth and the described bandwidth sum of described looped network, the Protection capacity that described looped network is current is adjusted into and is not less than described bandwidth sum.
8. device as claimed in claim 7 is characterized in that, also comprises:
Routing unit is used for described looped network business is carried out route, sets up the work tap switching path LSP of described looped network business, and described working LSP is the set of the active link of the described looped network business of carrying.
9. device as claimed in claim 8 is characterized in that, described adjustment unit, concrete difference for calculating the current Protection capacity of described bandwidth sum and described looped network; When the remaining bandwidth of judging described looped network was not less than described difference, the Protection capacity that described looped network is current was adjusted to and is not less than described bandwidth sum.
10. device as claimed in claim 9; it is characterized in that; described adjustment unit; also be used for when being no in described judgment unit judges; determine to exist other looped networks that comprise described active link except described looped network; the Protection capacity of described other looped networks is less than described bandwidth sum; and when the remaining bandwidth of described other looped networks is not less than the difference of the current Protection capacity of described bandwidth sum and described other looped networks, the current Protection capacity of described other looped networks is adjusted to be not less than described bandwidth sum.
11. device as claimed in claim 10; it is characterized in that; described routing unit; also be used in described judgment unit judges when being no; determine not exist other looped networks that comprise described active link except described looped network; or the current Protection capacity of described other looped networks that exist is less than described bandwidth sum; and the remaining bandwidth of described other looped networks is less than the difference of the current Protection capacity of described bandwidth sum and described other looped networks; then again described looped network business is carried out route, change the active link of described looped network business.
12. such as each described device of claim 7-11, it is characterized in that, also comprise:
Updating block is used for the Protection capacity that described looped network is current and adjusts to and be not less than after the described bandwidth sum, and the Protection capacity after adjusting according to described looped network upgrades the remaining bandwidth of described looped network.
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| CN104639463A (en) * | 2015-02-25 | 2015-05-20 | 浪潮电子信息产业股份有限公司 | Bandwidth regulating method and bandwidth regulating device for optical fiber switch |
| CN108199955A (en) * | 2016-12-08 | 2018-06-22 | 中兴通讯股份有限公司 | A kind of method for routing foundation and device |
| CN109525910A (en) * | 2019-01-04 | 2019-03-26 | 国网四川省电力公司经济技术研究院 | A kind of protecting electrical power system OTN network dual path planing method of minimum ring |
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