CN109150577A - Business management method and network management system - Google Patents
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- CN109150577A CN109150577A CN201710512824.0A CN201710512824A CN109150577A CN 109150577 A CN109150577 A CN 109150577A CN 201710512824 A CN201710512824 A CN 201710512824A CN 109150577 A CN109150577 A CN 109150577A
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- 238000007726 management method Methods 0.000 title claims abstract description 33
- 238000013507 mapping Methods 0.000 claims abstract description 28
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- 230000037430 deletion Effects 0.000 claims 2
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000003213 activating effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
- H04L41/145—Network analysis or design involving simulating, designing, planning or modelling of a network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0876—Network utilisation, e.g. volume of load or congestion level
- H04L43/0894—Packet rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/16—Threshold monitoring
Abstract
The present invention provides business management method and network management systems, wherein this method comprises: creating pseudo channel according to channel type or modifying the channel type of the pseudo channel according to channel type, which includes client properties and type of service attribute；Determine that there are the physical links of mapping relations with the pseudo channel；The business carried on the physical link is managed according to the mapping relations.Through the invention, it solves in the related technology that topology resource planning mode is single, does not support aiming at the problem that different business and client are customized, support according to client and the adjustment topology resource configuration of type of service difference.
Description
Technical field
The present invention relates to data network communications fields, particularly with regard to business management method and network management system.
Background technique
Before 4G mobile network occurs, voice service and simple Packet Service are only existed in optical transfer network, basis is logical
Believe that operator is mainly reachable in the routing of the business of calculating to the configuration management demand and network management capabilities of the topology of network, work is protected
Shield is separated from each other etc. in basic functions.However, with universal, the fast-developing and following 5G net of Internet of Things of mobile 4G network
The acceleration of network is commercial, and type of service is more and more abundant in network, they have the bandwidth, time delay, protection level of network different
It is required that proposing higher demand to the managerial ability of network.For example, virtual operator requires to rent a national networks, and
The professional L3VPN business of group customer only needs to rent certain several intercity network；Video conference provider needs to rent band
The biggish link of width, and original voice service needs time delay lower, the high link circuit resource etc. of protection level.It is this kind of with Internet of Things
All kinds of network new business to emerge one after another that the development of net and the innovation of various businesses Commercialization Model are born, promote basis
There is an urgent need to one kind may be programmed for common carrier, customized topology resource managing device, it may be convenient to each for each client
Kind type of service plans corresponding link circuit resource and analyzes its link circuit resource service condition.
It is single for topology resource planning mode in the related technology, it does not support to be directed to what different business was customized with client
Problem, the prior art are not put forward effective solutions also.
Summary of the invention
The present invention provides business management method and network management system, solves topology resource planning mode list in the related technology
One, it does not support aiming at the problem that different business and client are customized.
According to an aspect of the present invention, a kind of business management method is provided, comprising: virtual letter is created according to channel type
Road or the channel type that the pseudo channel is modified according to channel type, the channel type include client properties and type of service category
Property；Determine that there are the physical links of mapping relations with the pseudo channel；According to the mapping relations to carrying on the physical link
Business is managed.
Further, there are mapping relations for the physical link and at least one pseudo channel.
Further, this includes: to meet service class in presence according to the channel type that channel type modifies the pseudo channel
In the case that the pseudo channel of type attribute conditions and the pseudo channel support that more clients are shared, in the client properties of the pseudo channel
Increase customer information in list to modify the client properties of the pseudo channel；This creates pseudo channel according to channel type
The pseudo channel for meeting type of service attribute conditions is being not present, and/or is meeting the pseudo channel of type of service attribute conditions not
In the case where supporting that more clients are shared, pseudo channel is created according to the client properties and the type of service attribute.
Further, which further includes protection attribute, and the protection attribute is for indicating the first given client the
Default protection level in one specified services type, this according to the channel type that channel type modifies the pseudo channel include:
In the presence of the pseudo channel for meeting type of service attribute conditions and in the case that the pseudo channel supports that more clients are shared, the void is judged
Whether the protection level of quasi- channel meets the default protection level；In the case where the judgment result is yes, in the pseudo channel
Increase by the first given client information in client properties list.
Further, if the determination result is NO, the default protection level is turned down, or deletes this and is unsatisfactory for presetting
The pseudo channel of protection level.
Further, which further includes bandwidth attribute, and the bandwidth attribute is for indicating the second given client the
Guaranteed bandwidth value in two specified services types, this includes: to deposit according to the channel type that channel type modifies the pseudo channel
In the case where meeting the pseudo channel of type of service attribute conditions and the pseudo channel supports that more clients are shared, judge that this is virtual
Whether the bandwidth max-thresholds of channel are more than or equal to the guaranteed bandwidth value；In the case where the judgment result is yes, in the virtual letter
Increase by the second given client information in the client properties list in road.
Further, if the determination result is NO, the guaranteed bandwidth value is turned down, this is deleted and is unsatisfactory for guaranteed bandwidth
The pseudo channel of value.
It further, include: acquisition being managed according to the mapping relations to the business carried on the physical link
Guaranteed bandwidth value the sum of of three given clients in different service types；According to the sum of the guaranteed bandwidth value and the corresponding physics
Link total bandwidth determines the bandwidth usage of the third given client.
Further, it includes: acquisition that this, which is managed the business carried on the physical link according to the mapping relations,
The sum of guaranteed bandwidth value of the different clients carried in three specified services；According to the sum of the guaranteed bandwidth value and the corresponding physics
Link total bandwidth determines the bandwidth usage of the third specified services.
According to an aspect of the present invention, a kind of network management system, including processor and memory are provided, which is matched
It is set to the program instruction executed in the memory, which executes following operation: root when being read and executing by the processor
Pseudo channel is created according to channel type or modifies the channel type of the pseudo channel according to channel type, which includes visitor
Family attribute and type of service attribute；Determine that there are the physical links of mapping relations with the pseudo channel；According to the mapping relations pair
The business carried on the physical link is managed.
Through the invention, it can be made by oneself using introducing user between the application in existing physical topology and using topology resource
The technical solution of the channel type configuration management layer of justice, it is single to solve topology resource planning mode, does not support for not of the same trade or business
The problem of business is customized with client is supported according to client and the adjustment topology resource configuration of type of service difference.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of business management method according to an embodiment of the present invention；
Fig. 2 is the structural block diagram of network management system according to an embodiment of the present invention；
Fig. 3 is the flow chart of service activating method according to an embodiment of the present invention；
Fig. 4 is the flow chart of pseudo channel creation method according to an embodiment of the present invention；
Fig. 5 is the flow chart of pseudo channel creation method according to the preferred embodiment of the invention；
Fig. 6 is the flow chart one of service activating method according to the preferred embodiment of the invention；
Fig. 7 is the flow chart one of topological planing method according to the preferred embodiment of the invention；
Fig. 8 is the flowchart 2 of topological planing method according to the preferred embodiment of the invention；
Fig. 9 is the flow chart of business management method according to the preferred embodiment of the invention.
Specific embodiment
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and in combination with Examples.It should be noted that not conflicting
In the case of, the features in the embodiments and the embodiments of the present application can be combined with each other.
It is according to an embodiment of the present invention for providing a kind of business management method and network management system, Fig. 1 in the present embodiment
The flow chart one of business management method, as shown in Figure 1, the process includes the following steps:
Step S102 creates pseudo channel according to channel type or modifies the channel class of the pseudo channel according to channel type
Type, the channel type include client properties and type of service attribute；
Step S104 determines that there are the physical links of mapping relations with the pseudo channel；
It is noted that there are mapping relations for the physical link and at least one pseudo channel.
Preferably, supporting that more clients are shared in the presence of the pseudo channel and the pseudo channel for meeting type of service attribute conditions
In the case where, increase customer information in the client properties list of the pseudo channel to modify the client properties of the pseudo channel.
The above-mentioned business for meeting type of service attribute conditions and referring to the type of service and pseudo channel of business to be created or business to be adjusted
Type is identical.
Preferably, the pseudo channel for meeting type of service attribute conditions is being not present, and/or is meeting type of service attribute item
In the case that the pseudo channel of part does not support that more clients are shared, according to the client properties and the virtual letter of type of service attribute creation
Road.
Optionally, which can also include protection attribute, and the protection attribute is for indicating that the first given client exists
Default protection level in first specified services type.Meet the pseudo channel of type of service attribute conditions in presence and this is virtual
In the case that channel supports that more clients are shared, judge whether the protection level of the pseudo channel meets the default protection level.?
Judging result is in the case where being, to increase by the first given client information in the client properties list of the pseudo channel.Judging
As a result in the case where being no, the default protection level is turned down, or delete the pseudo channel for being unsatisfactory for default protection level.
Optionally, which can also include bandwidth attribute, and the bandwidth attribute is for indicating that the second given client exists
Guaranteed bandwidth value in second specified services type.There is the pseudo channel and the virtual letter for meeting type of service attribute conditions
In the case that road supports that more clients are shared, judge whether the bandwidth max-thresholds of the pseudo channel are more than or equal to the guaranteed bandwidth
Value；In the case where the judgment result is yes, increase by the second given client information in the client properties list of the pseudo channel.?
In the case that judging result is no, the guaranteed bandwidth value is turned down, the pseudo channel for being unsatisfactory for guaranteed bandwidth value is deleted.
Step S106 is managed the business carried on the physical link according to the mapping relations.Above-mentioned service management
Including but not limited to service fulfillment and traffic statistics.
It preferably, can be in the following way when needing to count the bandwidth usage of a certain client: it is specified to obtain third
Guaranteed bandwidth value the sum of of the client in different service types；It is total according to the sum of the guaranteed bandwidth value and the corresponding physical link
Bandwidth determines the bandwidth usage of the third given client.
It preferably, can be in the following way when needing to count the bandwidth usage of a certain business: it is specified to obtain third
The sum of guaranteed bandwidth value of the different clients carried in business；It is total according to the sum of the guaranteed bandwidth value and the corresponding physical link
Bandwidth determines the bandwidth usage of the third specified services.
Fig. 2 is the structural block diagram of network management system according to an embodiment of the present invention, as shown in Fig. 2, the device includes: processor
And memory, the processor are configured as executing the program instruction in the memory, which reads by the processor
Following operation is executed when execution: pseudo channel is created according to channel type or is modified according to channel type the channel of the pseudo channel
Type, the channel type include client properties and type of service attribute；Determine that there are the physics of mapping relations with the pseudo channel
Link；The business carried on the physical link is managed according to the mapping relations.
Invention is further explained combined with specific embodiments below.
The embodiment of the present invention is intended to provide a kind of topology resource configuration management device, by existing physical topology and making
Channel type configuration management layer is introduced between the application of topology resource, so that the topology of physics can possess client's classification, business
The programmable attribute such as classification, bandwidth, protection level so that operator fast and accurately opens new business, and facilitates the fortune of network
Battalion's maintenance, to cope with the new client's new business demand continued to bring out.
Specifically, the embodiment of the present invention proposes a kind of device by physical topology link SDNization existing in network, press
Physical link is mapped as virtual (one or more according to the customized channel type with programmable attribute of client's configuration
It is a) meet the pseudo channel of channel type specification.A kind of channel type corresponds to what a kind of physical link was mapped to pseudo channel
Mapping ruler, a newly-increased channel type are equivalent to newly define a kind of mapping ruler.It is noted that above-mentioned channel class
Type can be modified, and be equivalent to the modification to mapping ruler to the modification of channel type.The device overcomes existing network management skill
The problem of topological link present in art cannot be extended without client/service attribute or its attribute, realizes topological link
Programmable is virtualized, the network planning, service management, the efficiency of OA operation analysis and convenience are improved.
Wherein, software defined network (Software Defined Network, SDN) is both a kind of new network innovation frame
Structure is also a kind of a kind of technology of thought, and essence is to allow function modeling, software implementation, so that user/application can be as soft
Part programming equally uses network, and simple and quick adjustment network copes with various inside and outside Innovation Demands.
Compared with prior art, the beneficial effect of the embodiment of the present invention is:
1, the embodiment of the present invention by programmable channel type increase easily and fast new client and type of service or
Adjust its resource distribution attribute；
2, the embodiment of the present invention has reached link with different clients attribute by introducing channel type configuration management layer
Effect only filters out the topology resource that the client can be used, improves service management when opening new business for some client
Efficiency reduces the probability of business mispairing；
3, the present invention has achieved the effect that link has different business attribute, by introducing pseudo channel layer to analyze net
In network or certain section of each service resources service condition in chain road provides convenient and fast means；
4, the mapping of the present invention logical link and pseudo channel, so that topological link and corresponding router-level topology, bandwidth use
The application modules such as rate analysis keep business logic processing constant, achieve the purpose that smooth upgrade.
Under the scene for opening new business for client, newly opening an ELine (Ethernet Private Line) with new client A needs is
Example, as shown in figure 3, the service activating method includes:
Step S302 creates a channel type and creates pseudo channel according to the channel type；
Step S304 is filtered physical link by pseudo channel according to the channel type, and to filtered knot
Fruit carries out path computing, creates tunnel traffic；
Step S306 creates Ethernet service in newly-built tunnel traffic.
In one optionally embodiment, step S302 may include following steps, as shown in Figure 4:
Step S402 obtains the customized entitled ELine_A of new channel type of user；
Step S404 increases channel attribute 1, the entitled client properties of attribute 1 for ELine_A, and the value of attribute 1 is client A；
Step S406 increases channel attribute 2, the entitled type of service of attribute 2 for ELine_A, and the value of attribute 2 is ELine；
The configuration data of channel type ELine_A is stored in database by step S408；
Step S410 plans topology resource for ELine_A, selects link, creates pseudo channel.
Optionally, step S410 further includes following steps, as shown in Figure 5:
Step S502, for need to create pseudo channel selection there are the physical link Link1 of mapping relations；
Step S504 verifies Link1+Vlan100 with the presence or absence of the mapping with pseudo channel according to above-mentioned selection result:
If it does not exist, new pseudo channel Link1_Vlan100 is established, the Vlan100 under Link1 is bound, setting service attribute is
ELine, setting client properties are A, and it is false that setting client, which monopolizes attribute,；If it exists, verify the channel service attribute whether
For ELine, verifies whether the exclusive attribute of client is false if so, further, be then Link1_Vlan100 increasing if false
Add client properties A, it is that false indicates that the pseudo channel can carry multiple client traffics that wherein user, which monopolizes attribute,；
Step S506 stores newly-built pseudo channel Link1_Vlan100, or updates already present Link1_Vlan100
Client properties list, in client properties increase client A.
In another alternative embodiment, step S304 may include following steps, as shown in Figure 6:
Step S602, the channel type that determination need to activate the service are ELine_A；
Step S604, inquiry business attribute are ELine, and client properties include all pseudo channels of A, to filter out other
Incoherent physical link；
Pseudo channel is converted to actual topological link and its Vlan as the defeated of existing routing algorithm by step S606
Enter；
Step S608, routing algorithm module are routed by original logic calculation；
Step S610, by the establishing route tunnel traffic of calculating.
By taking increased channel type ELine_A as an example, in the scene for increasing protection attribute for it, as shown in fig. 7, should
Topological planing method includes:
Step S702 selects channel type ELine_A, edits its Custom Attributes list and increases attribute 4, the name of attribute 4 newly
Referred to as protection level, value are port level protection；
Step S704, inquiry belong to the existing pseudo channel of channel type ELine_A, verify and each of inquire virtual letter
Whether the protection level in road reaches requirement；
Step S706 prompts user to reduce the protection of the pseudo channel if there is the protection level of pseudo channel not reach requirement
Rank, or delete the pseudo channel for being unsatisfactory for protection level requirement；
Step S708 updates the attribute 4 of ELine_A and the pseudo channel deleted change data into database；
Step S710 plans new topology resource for ELine_A.
By taking increased channel type ELine_A as an example, in the scene for increasing bandwidth attribute for it, as shown in figure 8, should
Topological planing method includes:
Step S802 selects channel type ELine_A, edits its Custom Attributes list and increases attribute 3,3 title of attribute newly
For guaranteed bandwidth (CIR), value 10M；
Step S804, inquiry belong to the existing pseudo channel of channel type ELine_A, verify and each of inquire virtual letter
Whether road meets the requirement of guaranteed bandwidth；
Step S806, if having, pseudo channel meets the requirement of guaranteed bandwidth namely the maximum bandwidth of the pseudo channel is less than
10M prompts user to turn down bandwidth attribute value, or deletes the pseudo channel for not meeting bandwidth attribute；
Step S808 updates the attribute 3 of ELine_A and the pseudo channel deleted change data into database；
Step S810 plans new topology resource for ELine_A.
Under the scene of operation maintenance, the convenient operation dimension of bandwidth resources service condition topological in analysis network can be passed through
Shield.Assuming that having had channel type A1, A2, B1, B2: wherein A1, B1 are the Ethernet Private Line business of managing customer A, B respectively
Channel type all has bandwidth attribute, and bandwidth attribute value is respectively 10M, 15M.A2, B2 are the view of managing customer A, B respectively
The channel type of frequency convention business, and there is bandwidth attribute, bandwidth attribute value is respectively 20M, 25M.Business management method
Process is as shown in figure 9, include the following steps:
Step S902 selects physical link Link1, it is assumed that Link1 is in the application module of optical network management system
The optical fiber of 100M bandwidth inquires its bandwidth resources service condition；
Step S904 inquires the pseudo channel that all and Link1 establishes mapping relations, it is assumed that inquire Link1_
Vlan100 and Link1_Vlan200；
Step S906 is inquired according to the client properties list of Link1_Vlan100 and Link1_Vlan200 and service attribute
There are A1, A2, B1, B2 to corresponding channel type；
Step S908 inquires bandwidth usage situation: Link1 total bandwidth utilization rate 70% from the angle of customer type,
Middle client A is 30% (Ethernet service occupies 10M+ video conference business 20M), and corresponding client B is 40%；
Step S910 inquires bandwidth usage situation: Link1 total bandwidth utilization rate 70% from the angle of type of service,
Middle Ethernet Private Line business is 25% (15M of the Ethernet 10M+ client B of client A), and corresponding video conference business is 45%.
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
It is performed by computing device in the storage device, and in some cases, it can be to be different from shown in sequence execution herein
Out or description the step of, perhaps they are fabricated to each integrated circuit modules or by them multiple modules or
Step is fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and softwares to combine.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc. should all include within protection scope of the present invention.
Claims (10)
1. a kind of business management method characterized by comprising
Pseudo channel is created according to channel type or the channel type of the pseudo channel, the channel are modified according to channel type
Type includes client properties and type of service attribute；
Determine that there are the physical links of mapping relations with the pseudo channel；
The business carried on the physical link is managed according to the mapping relations.
2. the method according to claim 1, wherein the method also includes:
There are mapping relations for one physical link and at least one pseudo channel.
3. according to the method described in claim 2, it is characterized in that, the letter for modifying the pseudo channel according to channel type
Road type includes:
In the case where there is the pseudo channel for meeting type of service attribute conditions and the pseudo channel supports that more clients are shared,
Increase customer information in the client properties list of the pseudo channel to modify the client properties of the pseudo channel；
It is described to include: according to channel type creation pseudo channel
The pseudo channel for meeting type of service attribute conditions is being not present, and/or is meeting the virtual letter of type of service attribute conditions
In the case that road does not support that more clients are shared, pseudo channel is created according to the client properties and the type of service attribute.
4. according to the method described in claim 3, it is characterized in that, the channel type further includes protection attribute, the protection
Attribute is described to be repaired according to channel type for indicating default protection level of first given client in the first specified services type
The channel type for changing the pseudo channel includes:
In the case where there is the pseudo channel for meeting type of service attribute conditions and the pseudo channel supports that more clients are shared,
Judge whether the protection level of the pseudo channel meets the default protection level；
In the case where the judgment result is yes, increase the first given client letter in the client properties list of the pseudo channel
Breath.
5. according to the method described in claim 4, it is characterized in that, the method also includes:
If the determination result is NO, the default protection level is turned down, or is unsatisfactory for default protection level described in deletion
Pseudo channel.
6. according to the method described in claim 3, it is characterized in that, the channel type further includes bandwidth attribute, the bandwidth
Attribute is described to be modified according to channel type for indicating guaranteed bandwidth value of second given client in the second specified services type
The channel type of the pseudo channel includes:
In the case where there is the pseudo channel for meeting type of service attribute conditions and the pseudo channel supports that more clients are shared,
Judge whether the bandwidth max-thresholds of the pseudo channel are more than or equal to the guaranteed bandwidth value；
In the case where the judgment result is yes, increase the second given client letter in the client properties list of the pseudo channel
Breath.
7. according to the method described in claim 6, it is characterized in that, the method also includes:
If the determination result is NO, the guaranteed bandwidth value is turned down, is unsatisfactory for the virtual of guaranteed bandwidth value described in deletion
Channel.
8. according to the method described in claim 6, it is characterized in that, according to the mapping relations to being held on the physical link
The business of load, which is managed, includes:
Obtain guaranteed bandwidth value the sum of of the third given client in different service types；
The band of the third given client is determined with the corresponding physical link total bandwidth according to the sum of described guaranteed bandwidth value
Wide occupancy.
9. according to the method described in claim 6, it is characterized in that, it is described according to the mapping relations on the physical link
The business of carrying, which is managed, includes:
Obtain the sum of the guaranteed bandwidth value of different clients carried in third specified services；
The band of the third specified services is determined with the corresponding physical link total bandwidth according to the sum of described guaranteed bandwidth value
Wide occupancy.
10. a kind of network management system, which is characterized in that including processor and memory, the processor is configured to described in executing
Program instruction in memory, described program instruction execute following operation when being read and executing by the processor:
Pseudo channel is created according to channel type or the channel type of the pseudo channel, the channel are modified according to channel type
Type includes client properties and type of service attribute；
Determine that there are the physical links of mapping relations with the pseudo channel；
The business carried on the physical link is managed according to the mapping relations.
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