CN103379007B - A kind of Protection capacity of intersecting ring network determines method and device - Google Patents
A kind of Protection capacity of intersecting ring network determines method and device Download PDFInfo
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Abstract
The invention discloses a kind of Protection capacities of intersecting ring network to determine method and device; determine all looped networks of the active link comprising carrying looped network business; for every active link that a looped network is included, the sum of bandwidth of all looped network business carried on the active link is calculated;When judging the current Protection capacity of the looped network less than the sum of bandwidth calculated; according to the sum of the remaining bandwidth capacity of looped network and bandwidth; the current Protection capacity of looped network is adjusted to not less than the sum of bandwidth; it realizes and each active link for carrying looped network business is protected in intersecting ring network; and; there can be multiple intersecting ring networks to protect same active link, improve the survival ability of looped network business in a network.
Description
Technical field
The present invention relates to the planning and designing technical field of communication network more particularly to a kind of Protection capacity of intersecting ring network are true
Determine method and device.
Background technology
Packet Transport Network (PTN, Packet Transport Network) is supported a variety of double based on packet switching service
To point-to-point connection channel, have and be suitble to various large or fine granule business, end to end networking capabilities, it can not only preferably be carried
Carrier ethernet business, and traditional time division multiplexing (TDM, Time-Division Multiplexing) industry can be taken into account
Business.In the Metropolitan Area Network (MAN) of operator of China, PTN technologies are primarily targeted for the convergence access layer of metropolitan area, and the business mainly carried has:
2G/3G BTS services, group's special line and internet big customer's business, such as business hall Digital China network (DCN, Digital
China Networks) and Interactive Internet TV (IPTV) interior business, optical line terminal (OLT, Optical
LineTerminal), Wireless LAN (WLAN, Wireless Local Area Networks), environmental monitoring etc. are a variety of
High-quality Packet Service.Once link or node failure in PTN network, a large number of services transmitted in PTN network will interrupt,
Cause huge loss, therefore, generally require in PTN network each active link of bearer service protect.
At present, there are mainly three types of protected modes in PTN network:Linear 1+1 protection, linear 1: 1 protection and looped network protection.It is right
The comparison for calculation methods of the protection link capacity of each active link is simple in linear protection and the protection of non-intersecting ring network, such as:
The network topological diagram of two non-intersecting ring networks as shown in Figure 1, the circle of tape label represents node in Fig. 1, connects each node
Line represents link, and the label of chain road represents the fiber count that the link includes;As can be seen that exist between node 2 and node 3
Both links, i.e. link a and link b, they are belonging respectively to two different looped networks, i.e. link a belongs to looped network A (1-2-3-4-1)
Belong to looped network B (2-5-6-3-2) with link b.In this case, the looped network business that bandwidth is W arrives node 3 by node 2
When, active link a or active link b are pertaining only to a looped network, then only exist a looped network and looped network business is arrived by node 2
The active link a or active link b of node 3 are protected.If the active link of the looped network business is a, looped network A (1-2-3-
Protection capacity 4-1) is W, and the Protection capacity of looped network B (2-5-6-3-2) is 0;If conversely, the active link of the 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 intersecting ring network as shown in Figure 2, in Fig. 2, the circle of tape label represents node, connects the line table of each node
Show link, the label of chain road represents the fiber count that the link includes;As can be seen that there are 1 between node 2 and node 3
Link, it belongs to two different looped networks, i.e. looped network A (1-2-3-4-1) and looped network B (2-5-6-3-2) simultaneously, then looped network A and
Looped network B intersects at the link, and looped network A and looped network B are known as intersecting ring network.In this case, bandwidth is that the looped network business of W is passing through
When crossing node 2 to node 3, active link belongs to two looped networks, then, two looped networks can be used to carry out this active link
Protection.
At present, the designing scheme that the rarer looped network business for active link across multiple intersecting ring networks is protected.
Invention content
An embodiment of the present invention provides a kind of Protection capacities of intersecting ring network to determine method and device, to realize intersecting
Each active link for carrying looped network business is protected in looped network.
A kind of Protection capacity of intersecting ring network provided in an embodiment of the present invention determines method, including:
Determine all looped networks of the active link comprising carrying looped network business;
For every active link that a looped network is included, all looped network industry carried on the active link are calculated
The sum of bandwidth of business;
When judging the current Protection capacity of the looped network less than the sum of described bandwidth calculated, according to the looped network
The current Protection capacity of the looped network is adjusted to not less than the sum of described bandwidth by the sum of remaining bandwidth and the bandwidth.
A kind of Protection capacity determining device of intersecting ring network provided in an embodiment of the present invention, including:
Determination unit, for determining all looped networks of the active link comprising carrying looped network business;
Computing unit for being directed to every active link that a looped network is included, is calculated and is held on the active link
The sum of bandwidth of all looped network business carried;
Judging unit, for judging whether the current Protection capacity of the looped network is less than the sum of described bandwidth calculated;
Adjustment unit, for when the judging unit is judged as YES, according to the remaining bandwidth of the looped network and the band
The current Protection capacity of the looped network is adjusted to not less than the sum of described bandwidth by the sum of width.
The advantageous effect of the embodiment of the present invention includes:
A kind of Protection capacity of intersecting ring network provided in an embodiment of the present invention determines method and device, determines comprising load-carrying ring
All looped networks of the active link of network service for every active link that a looped network is included, are calculated in the active link
The sum of bandwidth of all looped network business of upper carrying;When judging that the current Protection capacity of the looped network is less than the sum of bandwidth for calculating
When, according to the sum of the remaining bandwidth capacity of looped network and bandwidth, the current Protection capacity of looped network is adjusted to not less than the sum of bandwidth,
It realizes and each active link for carrying looped network business is protected in intersecting ring network, and it is possible to there is multiple intersecting ring networks pair
Same active link is protected, and improves the survival ability of looped network business in a network.
Description of the drawings
Fig. 1 is the network topological diagram of two non-intersecting ring networks in the prior art;
Fig. 2 is the network topological diagram of two intersecting ring networks in the prior art;
Fig. 3 is that the Protection capacity of intersecting ring network provided in an embodiment of the present invention determines one of flow chart of method;
Fig. 4 is that the Protection capacity of intersecting ring network provided in an embodiment of the present invention determines the two of the flow chart of method;
Fig. 5 is the network topological diagram of example provided in an embodiment of the present invention;
Fig. 6 is the structure diagram of the Protection capacity determining device of intersecting ring network provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings, the tool of method and device is determined to the Protection capacity of intersecting ring network provided in an embodiment of the present invention
Body embodiment is described in detail.
A kind of Protection capacity of intersecting ring network provided in an embodiment of the present invention determines method, as shown in figure 3, specifically include with
Lower step:
S301, all looped networks for determining the active link comprising carrying looped network business;Wherein, looped network business can be one
Looped network business can be multiple looped network business, not limit the quantity of looped network business herein;
Preferably, before step S301 is performed, further include:Looped network business is route, establishes the looped network business
Work tap switching path LSP, work LSP are the set for the active link for carrying the looped network business.
Specifically, the work LSP that existing Di jkstra shortest path firsts calculate looped network business may be used.
In the specific implementation, it when there is the collection of services combined by multiple looped network business, needs to traverse collection of services, it is right
Each looped network business establishes work LSP, the work LSP of each looped network business is then traversed, to every work in each work LSP
Make link, determine all looped networks for including the active link, form the looped network set of the active link.
In the specific implementation, each looped network in the looped network set to the active link is needed to perform following operation:
S302, the every active link included for a looped network, calculate all rings carried on the active link
The sum of bandwidth of network service;
S303, judge whether the current Protection capacity of the looped network is less than the sum of bandwidth calculated, if so, performing step
S304;If not, it is believed that the current Protection capacity of the looped network is without adjustment, it is already possible to protect what is carried on the active link to own
Looped network business then turns to step S302;
S304, according to the sum of the remaining bandwidth of the looped network and bandwidth, the current Protection capacity of looped network is adjusted to be not less than
The sum of bandwidth, therein, it can be seen that the total capacity of each looped network is a fixed value, the residue of total capacity=looped network of looped network
The Protection capacity of bandwidth+looped network.
Specifically, the current Protection capacity of looped network can be adjusted to be equal to the sum of bandwidth, can also be current by looped network
Protection capacity is adjusted to be more than the sum of bandwidth, does not limit herein.
Preferably, after step S304 is performed, as shown in figure 3, can also include the following steps:
S305, adjusted according to looped network after Protection capacity, update the remaining bandwidth of the looped network, that is, the residue of looped network after updating
Protection capacity after the total capacity of bandwidth=looped network-looped network adjustment.
Specifically, in above-mentioned steps S304 according to the sum of remaining bandwidth of the looped network and bandwidth, by the current protection of looped network
Capacity is adjusted to the detailed process not less than the sum of bandwidth, as shown in figure 4, may comprise steps of:
The difference of the sum of S401, computation bandwidth Protection capacity current with looped network;
S402, judge the remaining bandwidth of looped network whether not less than difference;If so, perform step S403;
S403, the current Protection capacity of looped network is adjusted to not less than the sum of bandwidth.
Preferably, when performing step S402, if judging result is no, as shown in figure 4, following step can also be included
Suddenly:
S404, other looped networks comprising the active link in addition to the looped network are determined whether there is, if so, performing step
S405;If it is not, perform step S408;
S405, determine whether the current Protection capacity of other looped networks is less than the sum of bandwidth;If so, further confirm that other
Whether the current Protection capacity of looped network is held it is possible that be adjusted to that all looped network business carried on the service link can be protected
Row step S406;If not, it is determined that the current Protection capacity of other looped networks can protect what is carried on the service link to own
Looped network business performs step S409;
S406, judge the remaining bandwidth of other looped networks whether not less than the sum of the bandwidth Protection capacity current with other looped networks
Difference;If so, perform step S407;If not, then it is assumed that fail to the work LSP that the looped network business is established, perform step
S408;
S407, the sum of the current Protection capacity of other looped networks is adjusted to not less than bandwidth, to ensure that other looped networks can be with
Protect all looped network business carried on the service link;
Further, the Protection capacity after can also being adjusted according to other looped networks updates the remaining bandwidth of other looped networks,
Protection capacity after updating after the total capacity of remaining bandwidth=other looped networks of other looped networks-other looped networks adjustment.
S408, looped network business is route again, changes the active link of looped network business;
S409, this flow is exited.
Looped network business is route again performing step S408, changes after the active link of looped network business, needs
S301~S304 in the above method provided in an embodiment of the present invention is re-executed, until determining that there are at least one in a network
Until looped network carries out looped network protection to all looped network business carried on active link.
The determining method of the Protection capacity of above-mentioned intersecting ring network provided through the embodiment of the present invention can be realized intersecting
Each active link for carrying looped network business is protected, also, due to that there can be multiple intersecting ring networks to same in looped network
Active link is protected, and improves the survival ability of looped network business in a network.
Further, due to that can be adjusted to the current Protection capacity of each looped network to be equal on claimed active link
The sum of bandwidth of all looped network business of carrying can protect the premise of each looped network business in the Protection capacity for ensureing intersecting ring network
Under, reduce the redundancy bandwidth in intersecting ring network to the greatest extent.
The above method provided in an embodiment of the present invention determines that the Protection capacity of intersecting ring network can be adapted for network establishment
Initial stage has determined each looped network business that will be carried in network in network planning process, to intersecting ring network each in network
Carry out Protection capacity planning;When being readily applicable to looped network business and being dynamically added network, for the looped network business tune newly added in
The process of the Protection capacity of whole each intersecting ring network does not limit the application scenarios of intersecting ring network provided in an embodiment of the present invention herein.
For determining the Protection capacity of intersecting ring when building a new PTN network below, to the embodiment of the present invention
The above method of offer is described in detail, and detailed process is as follows:
1st, PTN network topological diagram is established, as shown in figure 5, wherein, the circle of tape label represents node, connects each node
Line represents link, and the label of chain road represents the fiber count that the link includes, and the Protection capacity for setting each looped network initial is 0, respectively
Bandwidth of an optical fiber is 10G.
2nd, the collection of services that PTN network needs as shown in Table 1 carry is traversed successively, establishes the work of each looped network business
LSP.Such as:Looped network business PW1, active link are (1-2,2-3);Looped network business PW2, active link are (1-2,2-8);
Looped network business PW3, active link are (1-2,2-5).
Table 1
Traffic ID | Source node | Destination node | Traffic direction | The bandwidth of business | Protected mode |
PW1 | 1 | 3 | It is two-way | 500M | Looped network protection |
PW2 | 1 | 8 | It is two-way | 300M | Looped network protection |
PW3 | 1 | 5 | It is two-way | 350M | Looped network protection |
3rd, the active link of each looped network business is traversed successively, and setting for Protection capacity is carried out to the looped network comprising the active link
It puts.
For the active link (1-2) of looped network business PW1, the looped network including this link has looped network 1 (1-2-3-4-1) and ring
The initial Protection capacity of net 3 (7-8-2-1-7) is 0, the both less than bandwidth 500M of looped network business PW1, then by 1 (1-2-3- of looped network
4-1) and the Protection capacity of looped network 3 (7-8-2-1-7) is set as 500M.Similarly, for the active link (2- of looped network business PW1
3), the Protection capacity of the looped network 1 (1-2-3-4-1) including this link be 500M, the bandwidth 500M not less than 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 not to 1 (1-2- of looped network
3-4-1) current Protection capacity is adjusted;The initial Protection capacity of looped network 2 (2-5-6-3-2) including this link is 0, small
In the bandwidth 500M of looped network business PW1, then the Protection capacity of looped network 2 (2-5-6-3-2) is set as 500M.
For the active link (1-2) of looped network business PW2, the looped network including this link has looped network 1 (1-2-3-4-1) and ring
The current Protection capacity of net 3 (7-8-2-1-7) is 500M, both less than the sum of bandwidth of looped network business PW1 and looped network business PW2
The Protection capacity of looped network 1 (1-2-3-4-1) and looped network 3 (7-8-2-1-7) is then set as 800M by 800M.Similarly, for looped network
The active link (2-8) of business PW2, the Protection capacity that the looped network including this link has looped network 3 (7-8-2-1-7) current are
800M, the bandwidth 300M more than looped network business PW2, it is believed that looped network 3 (7-8-2-1-7) can be to the working chain of looped network business PW2
(2-8) is protected on road, then the Protection capacity of looped network 3 (7-8-2-1-7) is not adjusted.
For the active link (1-2) of looped network business PW3, the looped network including this link has looped network 1 (1-2-3-4-1) and ring
The current Protection capacity of net 3 (7-8-2-1-7) is 800M, both less than looped network business PW1, looped network business PW2 and looped network business PW3
The sum of bandwidth 1150M, then the current Protection capacity of looped network 1 (1-2-3-4-1) and looped network 3 (7-8-2-1-7) is set as
1150M.Similarly, for the active link (2-5) of looped network business PW3, the looped network including this link has looped network 2 (2-5-6-3-2)
Current Protection capacity is 500M, the bandwidth 350M more than looped network business PW3, it is believed that looped network 2 (2-5-6-3-2) can be to looped network
The active link (2-5) of business PW3 is protected, then the Protection capacity of looped network 2 (2-5-6-3-2) is not adjusted.
4th, the Protection capacity of each looped network after the completion of final planning is as shown in table 2.
Table 2
Looped network ID and node | Initial capacity | Capacity after the completion of planning |
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 present invention additionally provides a kind of Protection capacity determining device of intersecting ring network,
Since the principle that the device solves the problems, such as to a kind of aforementioned Protection capacity of intersecting ring network determines that method is similar, the device
Implementation may refer to the implementation of method, and overlaps will not be repeated.
A kind of Protection capacity determining device of intersecting ring network provided in an embodiment of the present invention, as shown in fig. 6, including:
Determination unit 601, for determining all looped networks of the active link comprising carrying looped network business;
Computing unit 602 for being directed to every active link that a looped network is included, is calculated and is held on the active link
The sum of bandwidth of all looped network business carried;
Judging unit 603, for judging whether the current Protection capacity of looped network is less than the sum of bandwidth calculated;
Adjustment unit 604, for when judging unit 603 is judged as YES, according to the sum of the remaining bandwidth of looped network and bandwidth,
The current Protection capacity of looped network is adjusted to not less than the sum of bandwidth.
Further, in above device, as shown in fig. 6, further including:Routing unit 605, for being carried out to looped network business
Routing, establishes the work tap switching path LSP of looped network business, work LSP is the active link for carrying the looped network business
Set.
Further, above-mentioned adjustment unit 604, specifically for the difference of the sum of computation bandwidth Protection capacity current with looped network
Value;When the remaining bandwidth for judging looped network is not less than difference, the current Protection capacity of looped network is adjusted to not less than the sum of bandwidth.
Further, above-mentioned adjustment unit 604 is additionally operable to when judging unit 603 is judged as NO, determining that there are division rings
Other looped networks comprising active link except net, the Protection capacity of other looped networks are less than the sum of bandwidth, and other looped networks is surplus
When remaining bandwidth is not less than the sum of the bandwidth difference of the Protection capacity current with other looped networks, by the current Protection capacity of other looped networks
It is adjusted to not less than the sum of bandwidth.
Further, above-mentioned routing unit 605 is additionally operable to when judging unit 603 is judged as NO, and determines that there is no division rings
The current Protection capacity of other looped networks comprising active link or other existing looped networks except net is less than the sum of bandwidth, and
The remaining bandwidth of other looped networks is less than the difference of the sum of the bandwidth Protection capacity current with other looped networks, then again to looped network business
It is route, changes the active link of looped network business.
Further, in above device, as shown in fig. 6, further including:Updating unit 606, for by the current guarantor of looped network
Shield capacity is adjusted to be not less than after the sum of bandwidth, the Protection capacity after being adjusted according to looped network, updates the remaining bandwidth of looped network.
Through the above description of the embodiments, those skilled in the art can be understood that the embodiment of the present invention
The mode of necessary general hardware platform can also be added to realize by software by hardware realization.Based on such reason
Solution, the technical solution of the embodiment of the present invention can be embodied in the form of software product, which can be stored in one
A non-volatile memory medium (can be CD-ROM, USB flash disk, mobile hard disk etc.) in, it is used including some instructions so that a meter
It calculates machine equipment (can be personal computer, server or the network equipment etc.) and performs side described in each embodiment of the present invention
Method.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, module or stream in attached drawing
Journey is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in device in embodiment can describe be divided according to embodiment
It is distributed in the device of embodiment, respective change can also be carried out and be located in one or more devices different from the present embodiment.On
The module for stating embodiment can be merged into a module, can also be further split into multiple submodule.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
A kind of Protection capacity of intersecting ring network provided in an embodiment of the present invention determines method and device, determines comprising load-carrying ring
All looped networks of the active link of network service for every active link that a looped network is included, are calculated in the active link
The sum of bandwidth of all looped network business of upper carrying;When judging that the current Protection capacity of the looped network is less than the sum of bandwidth for calculating
When, according to the sum of the remaining bandwidth capacity of looped network and bandwidth, the current Protection capacity of looped network is adjusted to not less than the sum of bandwidth,
It realizes and each active link for carrying looped network business is protected in intersecting ring network, and it is possible to there is multiple intersecting ring networks pair
Same active link is protected, and improves the survival ability of looped network business in a network.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (12)
1. a kind of Protection capacity of intersecting ring network determines method, which is characterized in that including:
Determine all looped networks of the active link comprising carrying looped network business;
For every active link that a looped network is included, all looped network business for being carried on the active link are calculated
The sum of bandwidth;
When judging the current Protection capacity of the looped network less than the sum of described bandwidth calculated, according to the residue of the looped network
The current Protection capacity of the looped network is adjusted to not less than the sum of described bandwidth by the sum of bandwidth and the bandwidth.
2. the method as described in claim 1, which is characterized in that determining all of the active link comprising carrying looped network business
Before looped network, further include:
Looped network business is route, establishes work tap the switching path LSP, the work LSP of the looped network business to hold
Carry the set of the active link of the looped network business.
3. method as claimed in claim 2, which is characterized in that according to the sum of the remaining bandwidth of the looped network and the bandwidth,
The current Protection capacity of the looped network is adjusted to, not less than the sum of described bandwidth, specifically include:
Calculate the difference of the sum of described bandwidth Protection capacity current with the looped network;
When the remaining bandwidth for judging the looped network is not less than the difference, the current Protection capacity of the looped network is adjusted to not
Less than the sum of described bandwidth.
4. method as claimed in claim 3, which is characterized in that further include:
When the remaining bandwidth for judging the looped network is less than the difference, determine to include the work in the presence of in addition to the looped network
Make other looped networks of link, the current Protection capacity of other described looped networks is less than the sum of described bandwidth, and other looped networks
Remaining bandwidth, then will other described looped networks not less than the difference of the sum of the bandwidth Protection capacity current with other described looped networks
Current Protection capacity is adjusted to not less than the sum of described bandwidth.
5. method as claimed in claim 4, which is characterized in that further include:
When the remaining bandwidth for judging the looped network is less than the difference, determine to be not present in addition to the looped network comprising the work
Make other looped networks of link or the current Protection capacity of other existing described looped networks be less than the sum of described bandwidth, and it is described its
The remaining bandwidth of his looped network is less than the difference of the sum of the bandwidth Protection capacity current with other described looped networks, then again to institute
It states looped network business to be route, changes the active link of the looped network business.
6. such as claim 1-5 any one of them methods, which is characterized in that the current Protection capacity of the looped network is adjusted to
After the sum of described bandwidth, further include:
Protection capacity after being adjusted according to the looped network updates the remaining bandwidth of the looped network.
7. a kind of Protection capacity determining device of intersecting ring network, which is characterized in that including:
Determination unit, for determining all looped networks of the active link comprising carrying looped network business;
Computing unit for being directed to every active link that a looped network is included, calculates what is carried on the active link
The sum of bandwidth of all looped network business;
Judging unit, for judging whether the current Protection capacity of the looped network is less than the sum of described bandwidth calculated;
Adjustment unit, for when the judging unit is judged as YES, according to the remaining bandwidth of the looped network and the bandwidth it
The sum of with, the current Protection capacity of the looped network is adjusted to not less than described bandwidth.
8. device as claimed in claim 7, which is characterized in that further include:
Routing unit for being route to the looped network business, establishes the work tap switching path of the looped network business
LSP, the work LSP are the set for the active link for carrying the looped network business.
9. device as claimed in claim 8, which is characterized in that the adjustment unit, specifically for calculating the sum of described bandwidth
The difference of current Protection capacity with the looped network;When the remaining bandwidth for judging the looped network is not less than the difference, by institute
The current Protection capacity of looped network is stated to be adjusted to not less than the sum of described bandwidth.
10. device as claimed in claim 9, which is characterized in that the adjustment unit is additionally operable to work as and sentence in the judging unit
Break when being no, determine other looped networks for including the active link for having in addition to the looped network, the guarantor of other looped networks
It protects capacity and is less than the sum of described bandwidth, and the remaining bandwidth of other looped networks is not less than the sum of described bandwidth and other described rings
When netting the difference of current Protection capacity, by the current Protection capacity of other described looped networks be adjusted to not less than the bandwidth it
With.
11. device as claimed in claim 10, which is characterized in that the routing unit is additionally operable to sentence in the judging unit
Break when being no, determine there is no other looped networks comprising the active link in addition to the looped network or it is existing described in its
The current Protection capacity of his looped network is less than the sum of described bandwidth, and the remaining bandwidth of other looped networks is less than the sum of described bandwidth
The difference of current Protection capacity, then again route the looped network business with other described looped networks, changes the looped network
The active link of business.
12. such as claim 7-11 any one of them devices, which is characterized in that further include:
Updating unit, for the current Protection capacity of the looped network to be adjusted to after being not less than the sum of described bandwidth, according to institute
The Protection capacity after looped network adjustment is stated, updates the remaining bandwidth of the looped network.
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