CN102299852A - Control method and device for binding mapping between inter-domain link and intra-domain channel for cross-domain service - Google Patents

Abstract

The invention discloses a method and device for binding and mapping control of inter-domain links and intra-domain channels for cross-domain services, and is mainly designed for the defects existing in the linkage mapping relationship established between existing inter-domain links and intra-domain channels. The control method of the present invention includes: when establishing the first cross-domain service passing through the inter-domain link, selecting a large-grained intra-domain channel according to a preset policy, and automatically binding its mapping relationship with the inter-domain link. When subsequently establishing cross-domain services via the inter-domain link, the routing calculation policy of the control plane is associated with the mapping relationship, and automatically aggregates the cross-domain services into the intra-domain channels specified by the mapping relationship. The binding mapping relationship lasts until all service connections carried on the inter-domain link are released after being torn down. The method proposed by the invention can correctly control the establishment and aggregation of cross-domain services without adding hardware network equipment.

Description

Method and device for binding and mapping control of inter-domain links and intra-domain channels for cross-domain services

technical field

The present invention relates to the field of communication networks, in particular to a binding mapping control method and device for cross-domain service inter-domain links and intra-domain channels under the condition of multi-layer multi-domain heterogeneous optical network interconnection.

Background technique

In recent years, with the diversification of business requirements and the continuous innovation of optical network technology, multiple transmission methods such as Pasi-Synchronous Digital Hierarchy (PDH), Synchronous Digital Hierarchy (SDH), Wavelength Division Multiplexing (WDM) and Optical Transport Network (OTN) The optical network based on technology has a long-term coexistence development situation. In order to better provide service transmission, the interconnection and intercommunication of various heterogeneous optical networks has become a major development trend of optical networks. Due to the fact that many optical networks have different requirements for operation, function and security at this stage, various optical networks are generally divided into relatively independent autonomous systems (AS) or domains, and the domains are connected through inter-domain links. connected. Another development requirement of the optical network is the dynamic control of the network. The Automatically Switched Optical Network (ASON) proposed by ITU-T (International Telecommunication Union Standardization Organization for Telecommunications) and the Generalized Multipath Label Switching (GMPLS) control plane proposed by IETF (Internet Engineering Task Force) both provide dynamic optical network construction. basic reference. The emergence of Path Computation Element (PCE) technology provides supplements for the GMPLS control plane in terms of multi-restricted routing and inter-domain control, forming a more generalized control plane. In addition, for OTN and other complex networks that support multi-granularity switching, the control plane can abstract it into a layered virtual topology, and implement dynamic control of services with different granularities at different levels to form multi-layer network control.

Because each domain of a multi-layer multi-domain network adopts different transmission technologies during network construction, the types of transmission equipment in each domain are often inconsistent, and the switching granularity of equipment in different domains does not match. For example, the switching granularity of equipment in the OTN domain is generally not less than 2.5Gbits/s, while the switching granularity of equipment in the SDH domain can be as fine as 155Mbits/s. This situation brings certain limitations to the inter-domain routing and control of optical networks. When one end of the inter-domain link is connected to a large-grained switching device and the other end is connected to a small-grained switching device, then when a small-granularity cross-domain service is established through the inter-domain link, the cross-connection inside the large-granularity device is actually determined. and intra-domain business channels. After that, when the small-grained cross-domain service needs to pass through the inter-domain link when calculating the route, it can only select the intra-domain channel determined by the large-grained device crossover at the same time. That is to say, a linkage mapping relationship is established between the inter-domain link and the intra-domain channel after the establishment of the first cross-domain service, which affects the establishment of subsequent cross-domain services. Conversely, if the subsequent establishment of cross-domain services does not comply with this restriction, when the route calculation result of the new service passes through other intra-domain channels in the domain where the large-grained switching device is located, the problem of failure to establish a new service path or interruption of existing services will occur . Although the ITU-T working group has started to formulate a general mapping procedure (GMP) based on various bandwidth granules, there is still no clear solution to this problem in the industry.

Contents of the invention

In view of the above problems, the present invention provides a binding mapping control method and control device for cross-domain service inter-domain links and intra-domain channels. The control method and control device in the present invention can ensure that service routes passing through inter-domain links can be Find the correct service combing path in the large switching granularity autonomous domain, and can effectively avoid the problem of routing failure caused by the path calculation of small granularity cross-domain services when different granularity switching optical networks are interconnected without increasing the cross-connection limit of the transport plane.

In order to achieve the above purpose, the method for controlling the binding and mapping of cross-domain service inter-domain links and intra-domain channels according to the present invention includes the following steps:

Receive a cross-domain business request and determine the type of the business request;

If established for business:

Calculate and obtain the path of the pre-established cross-domain business;

Judging whether the inter-domain link in the path has a binding mapping relationship with the intra-domain channel in the path, if yes, find out the binding mapping relationship between the existing inter-domain link and the intra-domain channel; otherwise, according to the preset strategy Select the intra-domain channel corresponding to the inter-domain link, and establish the binding mapping relationship between the inter-domain link and the corresponding intra-domain channel;

Establish cross-domain business and aggregate the business into the intra-domain channel specified by the mapping relationship;

For business dismantling:

Remove the cross-domain service, and judge whether the inter-domain link in the cross-domain service path still carries the service after the service is removed. If yes, release the inter-domain link bandwidth resource occupied by the removed service; otherwise, release the inter-domain link The mapping relationship between roads and channels in the corresponding domain.

Further, the above step selects the intra-domain channel corresponding to the inter-domain link according to the preset policy, and establishes the binding mapping relationship between the inter-domain link and the corresponding intra-domain channel. After the step, it also includes:

Separate the intra-domain channel that is bound and mapped with the inter-domain link from the original abstract topology information, and become an independent channel in the domain that is specially connected to the inter-domain link that is bound and mapped, and update the abstract topology information;

Wherein, the separated information includes the bandwidth of the intra-domain channel and the inbound and outbound interfaces of the devices passing through the domain; the separated intra-domain channel bandwidth corresponds to the bandwidth of the wavelength channel carrying the cross-domain service.

Further, after the above step of releasing the mapping relationship between the inter-domain link and the corresponding intra-domain channel, it also includes:

Merge the bandwidth occupied by the intra-domain paths separated from the abstract topology information and the inbound and outbound interfaces of each device passing through the domain back into the original topology, and update the abstract topology information.

Further, the method for controlling the binding and mapping of inter-domain links and intra-domain channels for cross-domain services in the present invention further includes the step of: updating the traffic information of each inter-domain link and intra-domain channel in the traffic engineering database in real time.

Further, the step of finding out the binding mapping relationship between the existing inter-domain link and the intra-domain channel further includes: judging whether the inter-domain link specified by the found mapping relationship has enough remaining bandwidth resources, Yes, keep the binding mapping relationship between the existing inter-domain link and the intra-domain channel, and continue to the next step to complete the establishment of cross-domain services; otherwise, abandon the inter-domain link that already has a binding mapping relationship, and select another domain The inter-domain link and the intra-domain channel corresponding to the inter-domain link are selected according to the preset policy, and the binding mapping relationship between the inter-domain link and the corresponding intra-domain channel is established.

Further, the establishment of the binding mapping relationship between the inter-domain link and the corresponding intra-domain channel is specifically implemented as follows:

Create a list of binding mappings;

Store the inter-domain link label, the label of the intra-domain channel, and the protection and recovery type information of the intra-domain channel in the binding mapping relationship list.

Further, the preset policy is a routing policy and/or a traffic engineering policy.

In order to achieve the above purpose, the device for binding and mapping control of cross-domain service inter-domain links and intra-domain channels according to the present invention includes: a routing calculation engine, a traffic engineering database, and a connection management control module; wherein,

The routing calculation engine is connected to the traffic engineering database for data communication, and calculates the path of the cross-domain service establishment request received by the connection management control module; selects the intra-domain channel corresponding to the inter-domain link according to a preset policy, Establish a binding mapping relationship between the inter-domain link and the corresponding intra-domain channel, and output the established binding mapping relationship to the connection management control module;

The traffic engineering database includes an intra-domain traffic engineering database and an inter-domain traffic engineering database, the intra-domain traffic engineering database stores traffic information in each domain in the transmission plane; the inter-domain traffic engineering database stores traffic information between domains in the transmission plane traffic information;

The connection management control module includes: a service receiving submodule, a service establishment submodule, a binding mapping submodule, and a service removal submodule; wherein,

The service receiving submodule receives a cross-domain service request and judges the type of the service request; if it is a service establishment request, it calls the service establishment submodule; if it is a service dismantling request, it calls the service dismantling submodule;

The service establishment sub-module receives and judges whether the inter-domain link in the path output by the routing calculation engine has a binding mapping relationship with the intra-domain channel in the path, and if so, finds out the existing inter-domain link and The mapping relationship of the intra-domain channel, the service is aggregated into the intra-domain channel specified by the mapping relationship to establish the cross-domain service; otherwise, the routing calculation engine is called to establish the binding mapping relationship between the inter-domain link and the corresponding intra-domain channel, and the business is aggregated to Establish cross-domain services in the intra-domain channels specified in the binding mapping relationship;

The binding mapping submodule stores the established binding mapping relationship in the binding mapping relationship list;

The service removal sub-module removes the cross-domain service, and judges whether the inter-domain link in the cross-domain service path still carries the service after the service is removed, and if so, releases the bandwidth resource of the inter-domain link occupied by the removed service ; Otherwise, release the bandwidth resource of the inter-domain link occupied by the removed service, and cancel the mapping relationship between the inter-domain link and the corresponding intra-domain channel.

Further, the binding mapping relationship list includes: storing the inter-domain link label, the label of the intra-domain channel, and the protection and recovery type information of the intra-domain channel.

Further, the preset policy is a routing policy and/or a traffic engineering policy.

Beneficial effects of the present invention:

1. The present invention can realize the dynamic control of small granularity cross-domain services without adding small granularity switching devices in the large granularity switching network. In particular, it can avoid the routing failure caused by the path calculation of the small-grained cross-domain service without increasing the limitation of the cross-connection of the transmission plane when the switching optical networks with different granularities are interconnected.

2. The present invention increases the restrictive conditions for calculating cross-domain service routes by establishing the mapping relationship between inter-domain links and intra-domain channels, ensuring that service routes passing through inter-domain links can find the correct service sorting in autonomous domains with large switching granularity path.

3. The present invention can correctly control the establishment and aggregation of cross-domain services without adding hardware network devices.

Description of drawings

FIG. 1 is a schematic flow diagram of a method for controlling the binding and mapping of a cross-domain service inter-domain link and an intra-domain channel according to the present invention;

Fig. 2 is a schematic structural diagram of an embodiment of a multi-layer multi-domain heterogeneous optical network;

Fig. 3 is a schematic diagram of binding mapping between inter-domain links and intra-domain links of service 1 in the embodiment shown in Fig. 2;

FIG. 4 is a schematic diagram of topology separation after the abstraction of the binding mapping relationship is established in FIG. 3;

Fig. 5 is a schematic diagram of a simplified path after establishing service 2 and a schematic diagram of topology separation after abstraction of the path;

Fig. 6 is a schematic diagram of the path for establishing service 3;

FIG. 7 is a list of binding mapping relationships described in the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, the binding mapping control method of inter-domain links and intra-domain channels for cross-domain services according to the present invention includes the following steps:

Receive a cross-domain business request and determine the type of the business request;

If established for business:

Calculate and obtain the path of the pre-established cross-domain business;

Judging whether the inter-domain link in the path has a binding mapping relationship with the intra-domain channel in the path, if yes, find out the binding mapping relationship between the existing inter-domain link and the intra-domain channel; otherwise, according to the preset strategy Select the intra-domain channel corresponding to the inter-domain link, and establish the binding mapping relationship between the inter-domain link and the corresponding intra-domain channel;

Establish cross-domain business and aggregate the business into the intra-domain channel specified by the mapping relationship;

For business dismantling:

Remove the cross-domain service, and judge whether the inter-domain link in the cross-domain service path still carries the service after the service is removed. If yes, release the inter-domain link bandwidth resource occupied by the removed service; otherwise, release the inter-domain link The mapping relationship between roads and channels in the corresponding domain.

As a further embodiment of the present invention, in the above embodiment, the intra-domain channel corresponding to the inter-domain link is selected according to the preset policy, and the binding mapping relationship between the inter-domain link and the corresponding intra-domain channel is established, the steps Then also include:

Separate the intra-domain channel that is bound and mapped with the inter-domain link from the original abstract topology information, and become an independent channel in the domain that is specially connected to the inter-domain link that is bound and mapped, and update the abstract topology information;

Wherein, the separated information includes the bandwidth of the intra-domain channel and the inbound and outbound interfaces of the nodes passing through the domain; the separated intra-domain channel bandwidth corresponds to the bandwidth of the wavelength channel carrying the cross-domain service.

As a further embodiment of the present invention, in the above embodiment, the step of releasing the mapping relationship between the inter-domain link and the corresponding intra-domain channel further includes:

The bandwidth occupied by the intra-domain path separated from the abstract topology information and the incoming and outgoing interfaces of each node passing through the domain are merged back into the original topology, and the abstract topology information is updated.

As a further embodiment of the present invention, in the above embodiments, the method for controlling the binding and mapping of cross-domain service inter-domain links and intra-domain channels further includes the step of: updating each inter-domain link in the traffic engineering database in real time and traffic information of intra-domain channels. In this way, the intra-domain and inter-domain traffic information can be monitored in real time, so that each cross-domain service can selectively establish the binding mapping relationship between the inter-domain link and the intra-domain channel, and reduce the impact on the establishment of subsequent cross-domain services.

As a further embodiment of the present invention, in the above embodiment, the step of finding out the binding mapping relationship between the existing inter-domain link and the intra-domain channel also includes:

Judging whether the inter-domain link specified by the found mapping relationship has enough remaining bandwidth resources, if so, continue to the next step to complete the establishment of cross-domain services; otherwise, abandon the inter-domain link that already has a binding mapping relationship, and start Select other inter-domain links and select an intra-domain channel corresponding to the inter-domain link according to a preset policy, and establish a binding mapping relationship between the inter-domain link and the corresponding intra-domain channel.

This step is mainly performed by the routing calculation engine in practical applications. The current GMPLS protocol, such as OSPF-TE and other routing protocols, will judge whether there is enough remaining bandwidth resource according to the traffic engineering database (TE) during the routing calculation process.

In a specific embodiment, in the above embodiment, the establishment of the binding mapping relationship between the inter-domain link and the intra-domain channel is specifically implemented as follows:

Establish a binding mapping relationship list, as shown in Figure 7;

Store the inter-domain link label, the label of the intra-domain channel, and the protection and recovery type information of the intra-domain channel in the binding mapping relationship list.

Among them, "protection and recovery" are two survivability strategies in optical networks. Protection is the process of establishing multiple paths to carry services at the same time, such as 1+1 protection; recovery is the process of establishing only one path to carry services, and re-establishing a path to carry services after the path fails, such as rerouting.

In practical applications, as shown in FIG. 2, when a cross-domain service establishment request arrives at the management control plane 14, and the cross-domain route calculated by the path calculation engine passes through inter-domain links connecting switching optical network devices with different granularities, if the The inter-domain link has no bearer service before the service is established (that is, the service route is the first path passing through the inter-domain link), and the inter-domain link and the route passed by are bound according to the cross-domain routing information Large-grained exchange of the mapping relationship of channels in the autonomous domain.

When the cross-domain service establishment request arrives at the management control plane 14 again for cross-domain routing calculation, if a certain inter-domain link is to be selected, and the inter-domain link has a binding relationship with a certain intra-domain channel, then according to There are two options for cost calculation: the first option is to choose to pass through the inter-domain link and the intra-domain channel that has a binding mapping relationship with the inter-domain link at the same time; the second option is to abandon the domain The inter-domain link is included in the cross-domain routing, and the intra-domain channel that has a binding mapping relationship with the inter-domain link is not passed through, and other links are tried to be selected. Wherein, the cost may be the remaining bandwidth resource of the inter-domain link, fiber length loss, or service intensity. In the present invention, the cost may specifically be the remaining bandwidth resource of the inter-domain link, that is, if the bandwidth resource of the selected inter-domain link is sufficient, the first choice can be made, if the selected inter-domain link If the bandwidth resources of the road are not enough, the second choice can be made.

When a cross-domain service removal request reaches the management control plane 14, if the cross-domain service route passes through an inter-domain link with a binding relationship, it is judged whether the inter-domain link still carries services after the service is removed. If the inter-domain link does not carry services, the control plane releases the binding and mapping relationship between the inter-domain link and the intra-domain channel after the service is removed; otherwise, the control plane only completes the operation of removing the service.

The binding and mapping control method of inter-domain links and intra-domain channels for cross-domain services according to the present invention will be further described below in conjunction with a specific example.

As shown in FIG. 2 , this example is a heterogeneous optical network consisting of a management control plane 14 and a transmission plane 15 . The management control plane 14 has cross-domain routing computing capabilities, and manages and controls the traffic engineering of the entire network through intra-domain and inter-domain traffic engineering databases. Among them, the routing calculation engine completes the calculation of cross-domain routing, and the connection management control module is used to complete the establishment and removal of cross-domain services, so as to realize network communication between domains. In this example, the heterogeneous optical network manages and controls four domains in total, which are named domain A, domain B, domain C and domain D respectively.

Figure 3 shows the internal structure and interconnection of the four domains, A domain, B domain, C domain and D domain. Among them, the three domains A, C, and D are all SDH domains, and domain B is an OTN domain. The minimum switching granularity of equipment in the SDH domain is VC4 level, the bearer is transmitted in the STM1 frame, and the transmission rate is 155Mb/s; the minimum switching granularity of the equipment in the OTN domain is ODU1 level, the bearer is transmitted in the OTM0.1 frame, and the transmission rate is 2.5Gb /s. The transmission rate of the optical layer wavelength-level channel in the OTN domain is 10Gb/s, and one optical fiber can establish 4 wavelength channels (the maximum single fiber supports a transmission rate of 40Gb/s). The inter-domain links between domain A and domain B, between domain B and domain C, and between domain B and domain D are referred to as A-B, B-C, and B-D inter-domain links. Transmitted within STM16 frames. The number on each network device in Figure 3 represents the address of the device, numbered from 1 to 13. Each of the lines used for connection between devices in the SDH domain represents a time-division STM1 frame, and the connection pipes between devices in the OTN domain represent OTM0.1 frames. The pipes of the inter-domain links represent STM16 frames.

Building a business 1

Assume that the user requests the management and control plane to establish a cross-domain service with no protection type VC4 granularity, with port 5 of device No. 1 in domain A as the uplink end and port 6 of device No. 9 in domain C as the downlink end.

First, the management control plane receives the cross-domain service request, and obtains an available path through the device 1-2-4-5-6-8-9 through the calculation of the routing calculation engine, as shown in Figure 3 .

Then, the connection management control module respectively establishes label switching paths in domains A, B, and C based on the available path 1-2-4-5-6-8-9. The label switching paths of domains A and C use VC4 as the granularity, and the label switching paths of domain B are divided into two layers. The label switching path of the upper layer is the ODU1 granularity (2.5Gb/s) of the electrical layer, and the label switching path of the lower layer is the wavelength of the optical layer. Level granularity (10Gb/s). Wherein, channels 45 and 56 in the figure (namely upper layer label switching paths) can be used as intra-domain channels for carrying VC4 services.

Finally, by analyzing the route, the management control plane obtains that the route passes through the A-B inter-domain link 24 and the B-C inter-domain link 68 . However, before the cross-domain service is established, no service is carried on the two inter-domain links 24 and 68 . According to the binding mapping control process shown in FIG. 1, the management control plane establishes the binding mapping relationship between the A-B inter-domain link 24 and the first channel 45 and the binding mapping relationship between the B-C inter-domain link 68 and the second channel 56, And at the same time, bind the protection recovery type to unprotected type. The binding mapping relationship is stored according to the list shown in FIG. 7 .

After the above binding mapping relationship is established, the original topology can be abstracted as: separation of binding topology. Specifically, as shown in FIG. 4, devices 4, 5, and 6, as well as the first channel 45 and the second channel 56 as intra-domain channels, produce separation in an abstract sense, and abstract nodes 4', 5', and 6' and The first channel 45' and the second channel 56'. This process is actually to establish an optical layer wavelength-level channel in the OTN domain, and automatically discover an electrical layer ODU1 channel on it. These two channels are specially used for the A-B inter-domain link through the first channel 45' and the second channel 56' Road 24 and B-C inter-domain link 68 provide services. In the abstract topology, it can be considered that the bandwidth of 10 Gb/s is separated, and the bandwidth of 30 Gb/s is reserved for the first channel 45 and the second channel 46 in the original topology. In addition, it should be noted that service 1 may only occupy part of the bandwidth resources of the abstract first channel 45' and the second channel 56', and these remaining bandwidth resources can only be allocated to the A-B inter-domain link 24 and the B-C inter-domain Link 68 business.

Business 2

Assume that after service 1, the user requests from the management control plane to establish another non-protected VC4 cross-domain connection with port 8 of device No. business.

Due to the domain sequence connection relationship, the route of the cross-domain service of service 2 must pass through the B domain and the A-B, B-C inter-domain links 24 and 68, then according to the binding mapping control process shown in Figure 1, first search for the two inter-domain Whether there is a binding relationship between links 24 and 68. If the management control plane 14 finds the binding relationship between the two inter-domain links 24 and 68 and the first channel 45 and the second channel 56 respectively in the binding mapping relationship list shown in FIG. The domain topology information is simplified as a direct connection path as shown in FIG. 5 .

At this time, the route calculation engine in the management control plane 14 calculates the effective route of the service 2 according to the new abstract topology. After calculation, as shown in FIG. 5 , the management control plane 14 obtains an available path passing through the device 3-2-4-5-6-8-10. Since the route of the service 2 passes through the A-B inter-domain link 24 and the B-C inter-domain link 68, the service 2 is directly sorted into the first channel 45' and the second channel 56' in the abstract domain in the OTN domain. The available path also occupies another time slot of VC4 granularity (ie service 1) on the A-B inter-domain link 24, the first intra-domain channel 45, the second intra-domain channel 56 and the B-C inter-domain link 68. Therefore, it is necessary to update the traffic information of each intra-domain channel and inter-domain link in the traffic engineering database. In service 2, because no new binding mapping relationship between inter-domain links and intra-domain channels has been established, the abstract topology at this time remains unchanged. Special attention needs to be paid here: during the duration of the binding mapping relationship between the inter-domain link and the intra-domain channel, the inter-domain link cannot establish a connection relationship with other large-grained intra-domain channels.

business dismantling

Assuming that service 1 receives the service removal information first, it triggers the service removal process of the management control plane. After service 1 is removed, the control plane checks all inter-domain links that this service passes through. Since the A-B and B-C inter-domain links 24 and 68 still carry the service 2 after the service 1 is removed, the binding mapping between the A-B inter-domain link 24 and the first channel 45 and the B-C inter-domain link 68 and the second channel 56 is not performed. relationship to operate.

When the service 2 also receives the service removal information, it triggers the service removal process of the management control plane. After the service 2 is removed, the control plane checks all inter-domain links that this service passes through. Since the A-B and B-C inter-domain links 24 and 68 no longer carry other services at this time, the binding mapping relationship between the two inter-domain links and the first channel 45 and the second channel 68 is directly deleted from the binding mapping table. At this time, the abstract nodes 4', 5' and 6' and the first channel 45' and the second channel 56' of the intra-domain channels are different from the actual devices 4, 5 and 6 and the first channel 45 and the second channel 56 of the intra-domain channels Merge and restore the original topology. The restored topology is shown in Figure 3. After the topology is restored, the inter-domain link can be re-bound with other channels.

Business 3,

Assume that the user requests again from the management control plane to establish an intra-domain 1+1 protection type VC4 granularity cross-domain service with port No.

Due to the domain sequence connection relationship, the route of the cross-domain service must go through the B domain and the A-B, B-D inter-domain links 24 and 711 . After route calculation, the control plane obtains the working path passing through the device 1-2-4-7-11-13 and the protection path passing through the device 1-3-2-4-5-6-7-11-12-13. After each intra-domain label switching path is successfully established, it is ready to establish a binding relationship between the inter-domain link and the intra-domain channel. According to the binding mapping control process shown in Figure 1, the control plane respectively establishes the working path binding relationship between the A-B inter-domain link 24, the B-D inter-domain link 711 and the third channel 47, and the A-B inter-domain link 24, B-D The protection path binding relationship between the inter-domain link 711 and the fourth channel 4567.

After the binding mapping relationship is successfully established, other cross-domain services can also be aggregated according to the control method described in the present invention. The binding mapping relationship lasts until the inter-domain link does not bear any traffic.

As shown in Figure 2, the binding and mapping control device for inter-domain links and intra-domain channels for cross-domain services includes: a routing calculation engine, a connection management control module, and a traffic engineering database; wherein,

The routing calculation engine is connected to the traffic engineering database for data communication, and calculates the path of the cross-domain service establishment request received by the connection management control module; selects the intra-domain channel corresponding to the inter-domain link according to a preset policy, Establish a binding mapping relationship between the inter-domain link and the corresponding intra-domain channel, and output the established binding mapping relationship to the connection management control module;

The traffic engineering database includes an intra-domain traffic engineering database and an inter-domain traffic engineering database, the intra-domain traffic engineering database stores traffic information in each domain in the transmission plane; the inter-domain traffic engineering database stores traffic information between domains in the transmission plane traffic information;

The connection management control module includes: a service receiving submodule, a service establishment submodule, a binding mapping submodule, and a service removal submodule; wherein,

The service receiving submodule receives a cross-domain service request and judges the type of the service request; if it is a service establishment request, it calls the service establishment submodule; if it is a service dismantling request, it calls the service dismantling submodule;

The service establishment sub-module receives and judges whether the inter-domain link in the path output by the routing calculation engine has a binding mapping relationship with the intra-domain channel in the path, and if so, finds out the existing inter-domain link and The mapping relationship of the intra-domain channel, the service is aggregated into the intra-domain channel specified by the mapping relationship to establish the cross-domain service; otherwise, the routing calculation engine is called to establish the binding mapping relationship between the inter-domain link and the corresponding intra-domain channel, and the business is aggregated to Establish cross-domain services in the intra-domain channels specified in the binding mapping relationship;

The binding mapping submodule stores the established binding mapping relationship in the binding mapping relationship list;

The service removal sub-module removes the cross-domain service, and judges whether the inter-domain link in the cross-domain service path still carries the service after the service is removed, and if so, releases the bandwidth resource of the inter-domain link occupied by the removed service ; Otherwise, release the bandwidth resource of the inter-domain link occupied by the removed service, and cancel the mapping relationship between the inter-domain link and the corresponding intra-domain channel.

In practical applications, the connection management control module receives the user's request, and if the user's request is to establish a cross-domain service, the connection management control module sends a route calculation request to the route calculation engine. After the routing calculation engine returns the route to the connection management control module, the connection management control module will initiate a signaling process (such as RSVP-TE) on the management control plane, and notify the connection management control module after the process ends, and the connection management control module will send the business The establishment information is fed back to the user to complete the entire establishment process of the business.

Wherein, the binding mapping relationship list, as shown in FIG. 7 , includes: storing the inter-domain link label, the label of the intra-domain channel, and the protection and recovery type information of the intra-domain channel.

As a further embodiment of the present invention, in the foregoing embodiments, the preset policy is specifically a routing policy and/or a traffic engineering policy.

With the control method and control device described in the present invention, when the inter-domain links are connected to different granularity optical network equipment, if there is no small granularity cross-connection or control mechanism in the large granularity optical network equipment, the control plane is establishing the first When the small-grained cross-domain business passes through the inter-domain link, the large-grained intra-domain channel is selected according to the preset strategy, and the mapping relationship between it and the inter-domain link is automatically bound. Subsequent establishment of small-grained cross-domain services passing through the inter-domain link, the routing calculation policy of the control plane is associated with the mapping relationship, and automatically converges the small-grained cross-domain services into the large-grained intra-domain channels specified by the mapping relationship. The binding mapping relationship lasts until all service connections carried on the inter-domain link are released after being torn down. The method proposed by the invention can correctly control the establishment and aggregation of cross-domain services without adding hardware network equipment.

The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention are all Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be defined by the claims.

Claims (10)

1. A method for binding and mapping control of cross-domain service inter-domain links and intra-domain channels, characterized in that it comprises the following steps: Receive a cross-domain business request and determine the type of the business request; If established for business: Calculate and obtain the path of the pre-established cross-domain business; Judging whether the inter-domain link in the path has a binding mapping relationship with the intra-domain channel in the path, if yes, find out the binding mapping relationship between the existing inter-domain link and the intra-domain channel; otherwise, according to the preset strategy Select the intra-domain channel corresponding to the inter-domain link, and establish the binding mapping relationship between the inter-domain link and the corresponding intra-domain channel; Establish cross-domain business and aggregate the business into the intra-domain channel specified by the mapping relationship; For business dismantling: Remove the cross-domain service, and judge whether the inter-domain link in the cross-domain service path still carries the service after the service is removed. If yes, release the inter-domain link bandwidth resource occupied by the removed service; otherwise, release the inter-domain link The mapping relationship between roads and channels in the corresponding domain. 2. According to claim 1, the binding and mapping control method between inter-domain links and intra-domain channels for cross-domain services is characterized in that, the intra-domain channels corresponding to the inter-domain links are selected according to the preset strategy, and the intra-domain channels are established. The binding mapping relationship between the inter-domain link and the corresponding intra-domain channel, after the step also includes: Separate the intra-domain channel that is bound and mapped with the inter-domain link from the original abstract topology information, and become an independent channel in the domain that is specially connected to the inter-domain link that is bound and mapped, and update the abstract topology information; Wherein, the separated information includes the bandwidth of the intra-domain channel and the inbound and outbound interfaces of the devices passing through the domain; the separated intra-domain channel bandwidth corresponds to the bandwidth of the wavelength channel carrying the cross-domain service. 3. according to claim 2, the binding mapping control method between inter-domain links and intra-domain channels for cross-domain services, is characterized in that, after the step of releasing the mapping relationship between the inter-domain links and the corresponding intra-domain channels, it also includes : Merge the bandwidth occupied by the intra-domain paths separated from the abstract topology information and the inbound and outbound interfaces of each device passing through the domain back into the original topology, and update the abstract topology information. 4. According to claim 1, the binding and mapping control method of inter-domain links and intra-domain channels for cross-domain services, further comprising the step of: updating the traffic information of each inter-domain link and intra-domain channel in the traffic engineering database in real time . 5. According to claim 1 or 2, the binding and mapping control method of inter-domain links and intra-domain channels for cross-domain services is characterized in that, the described binding mapping of existing inter-domain links and intra-domain channels is found out relationship, this step also includes: Judging whether the inter-domain link specified by the found mapping relationship has enough remaining bandwidth resources, if so, continue to the next step to complete the establishment of cross-domain services; otherwise, abandon the inter-domain link that already has a binding mapping relationship, and start Select other inter-domain links and select an intra-domain channel corresponding to the inter-domain link according to a preset policy, and establish a binding mapping relationship between the inter-domain link and the corresponding intra-domain channel. 6. According to claim 1 or 2, the binding mapping control method between inter-domain links and intra-domain channels for cross-domain services is characterized in that, wherein, the establishment of a binding mapping relationship between inter-domain links and corresponding intra-domain channels , the specific implementation is as follows: Create a list of binding mappings; Store the inter-domain link label, the label of the intra-domain channel, and the protection and recovery type information of the intra-domain channel in the binding mapping relationship list. 7. The method for controlling the binding and mapping of cross-domain service inter-domain links and intra-domain channels according to claim 1 or 2, wherein the preset strategy is a routing strategy and/or a traffic engineering strategy. 8. A binding and mapping control device for inter-domain links and intra-domain channels for cross-domain services, characterized in that it includes: a routing calculation engine, a traffic engineering database, and a connection management control module; wherein, The routing calculation engine is connected to the traffic engineering database for data communication, and calculates the path of the cross-domain service establishment request received by the connection management control module; selects the intra-domain channel corresponding to the inter-domain link according to a preset policy, Establish a binding mapping relationship between the inter-domain link and the corresponding intra-domain channel, and output the established binding mapping relationship to the connection management control module; The traffic engineering database includes an intra-domain traffic engineering database and an inter-domain traffic engineering database, the intra-domain traffic engineering database stores traffic information in each domain in the transmission plane; the inter-domain traffic engineering database stores traffic information between domains in the transmission plane traffic information; The connection management control module includes: a service receiving submodule, a service establishment submodule, a binding mapping submodule, and a service removal submodule; wherein, The service receiving submodule receives a cross-domain service request and judges the type of the service request; if it is a service establishment request, it calls the service establishment submodule; if it is a service dismantling request, it calls the service dismantling submodule; The service establishment sub-module receives and judges whether the inter-domain link in the path output by the routing calculation engine has a binding mapping relationship with the intra-domain channel in the path, and if so, finds out the existing inter-domain link and The mapping relationship of the intra-domain channel, the service is aggregated into the intra-domain channel specified by the mapping relationship to establish the cross-domain service; otherwise, the routing calculation engine is called to establish the binding mapping relationship between the inter-domain link and the corresponding intra-domain channel, and the business is aggregated to Establish cross-domain services in the intra-domain channels specified in the binding mapping relationship; The binding mapping submodule stores the established binding mapping relationship in the binding mapping relationship list; The service removal sub-module removes the cross-domain service, and judges whether the inter-domain link in the cross-domain service path still carries the service after the service is removed, and if so, releases the bandwidth resource of the inter-domain link occupied by the removed service ; Otherwise, release the bandwidth resource of the inter-domain link occupied by the removed service, and release the mapping relationship between the inter-domain link and the corresponding intra-domain channel. 9. According to claim 8, the binding and mapping control device for cross-domain service inter-domain links and intra-domain channels, wherein the binding mapping relationship list includes: storing inter-domain link labels and labels for intra-domain channels And the protection and recovery type information of the channel in the domain. 10. The device for controlling the binding and mapping of cross-domain service inter-domain links and intra-domain channels according to claim 8, wherein the preset policy is a routing policy and/or a traffic engineering policy.

Images