WO2009076841A1 - Method, system and device for obtaining the route topological information and establishing the routing - Google Patents

Abstract

A method, a system and a device for obtaining the route topological information and establishing the route, which belongs to the technical field of the packet network. The method includes: collecting the link state advertisement information sent by the router through the control management channel between the Control Management Device (CMD) and the router belonging to the area of the CMD (102); calculating the route topological diagram belonging to the area of the CMD according to the link state advertisement information (103); calculating the route table of the router belonging to the area of the CMD according to the route topological diagram (104). The device for obtaining the route topological information includes the information receiving module and the topological diagram computing module. The system for establishing the route includes the router, the CMD and the route calculating device. The embodiment of invention can realize dynamic routing calculating, controlling and management.

Description

 Method, system and device for obtaining routing topology information and establishing routing The application is submitted to the Chinese Patent Office on November 30, 2007, and the application number is 200710178537. 7. The invention name is "Method, system and control management device for establishing routing" Priority of the Chinese Patent Application, the entire contents of which is incorporated herein by reference.

 Say

Technical field

 The present invention relates to the field of packet network technologies, and in particular, to a method, system and device for obtaining routing topology information and establishing a route.

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Background technique

 With the development of technology, the telecommunication network has successfully completed the transition from analog technology to digital technology. The transition from TDM (Time-Division Multiplexing) technology to packet switching technology is underway. ATM (Asynchronous Transfer Mode) , Asynchronous Transfer Mode) Packet technology is the representative of this transition, but due to technical difficulties and unsuccessful business operations, the second step of the telecommunications network has not been achieved. In the early 1990s, the Internet based on IP (IP Protocol) packet technology was extremely successful due to the application of Web technology. It quickly expanded into a global network that was able to compete with the telecom network, and then to telecommunications. Business extension. Therefore, the telecommunication network introduced IP packet technology and loaded all telecommunication services on the IP network, and it is expected to realize the transition from TDM technology to packet technology.

 However, in this process, because the typical IP network of the existing IP network is a free and open packet network without a unified management mechanism, its design concept is a free-form and non-profit business model, which causes the Internet to be insecure. Untrustworthy, lack of management, lack of guarantee of service quality, so that many important commercial service networks, as well as data interconnection services and real-time video services with high quality of service requirements, cannot be securely loaded onto public IP networks. IP packet technology Nor can it assume the heavy responsibility of the transition of Telecommunication technology from TDM technology to packet technology.

To this end, a HSAPN (Hierarchical and Sequential Address Packet Network), such as a public telecommunication packet data network, is proposed in the prior art to implement the second step of the telecommunication network. As shown in FIG. 1, the system includes at least one HSAPN network, a plurality of IP networks or ATM networks, and a FR (Frame Relay) network. (Because the IP network is the most widely used network, the following mainly uses IP networks. As an example, as well as a number of border entity (ED) devices, the IP network is connected to the HSAPN network through ED devices; each HSAPN network also includes Include at least one address translation entity (ADT); all devices in the HSAPN network are equipped with an HSAPN address with the ED device, and all devices and ED devices in the IP network are assigned an IP address, a mapping between the IP address and the HSAPN address. Saved in the address mapping table in the ADT. The hierarchical ordered address packet network HSAPN is a packet network used for telecommunication purposes. It is used to carry all existing telecommunication services, and can ensure that the telecommunication services it carries can provide the same quality of service as traditional telecommunication services. It can carry Internet services, provide the same capabilities as the existing Internet, support all existing Internet services that exist, and can be used to carry other services that may arise in the future.

 However, the routing tables in the current HSAPN are all implemented by static manual configuration, which consumes a lot of labor, and the manual configuration of the routing table is complicated and error-prone; in addition, the prior art does not propose how to implement public telecommunication packet data. Management control of dynamic routing in the network.

 On the other hand, with the development of packet networks, various ideas of control and forwarding separation and centralized routing control have emerged, but no specific method of how to establish routes after control and forwarding separation has been proposed. Summary of the invention

 In order to implement dynamic routing calculation, control, and management, an embodiment of the present invention provides a method and system for establishing a route. The technical solution is as follows:

 An embodiment of the present invention provides a method for establishing a route, including:

 Collecting link state advertisement information sent by the router by controlling a management management channel between the management device and a router in the area under which the control management device is located;

 Calculating a routing topology map of the area under the control management device according to the link state advertisement information; and calculating a routing table of the router in the area under the control management device according to the routing topology map.

 An embodiment of the present invention provides a system for establishing a route, including:

 a router, configured to establish a control management channel between the router and a control management device that governs the router; and send the link state advertisement information to the control management device by using the control management channel;

 a control management device, configured to establish a control management channel between the device and a router in the jurisdiction; collect the link state advertisement information sent by the router by using the control management channel; and calculate the location according to the link state advertisement information Routing topology map of the jurisdiction;

 The routing computing device is configured to calculate routing information of each router according to the routing topology map.

 In order to implement dynamic routing calculation, control, and management, an embodiment of the present invention further provides a method and apparatus for acquiring routing topology information. The technical solution is as follows:

 The embodiment of the invention provides a method for obtaining routing topology information, including:

Controlling the collection channel between the control management device and the router in the area under the jurisdiction of the control management device The link state advertisement information sent by the router in the area under the jurisdiction of the control management device;

 Obtaining routing topology information of the area under the control management device according to the link state advertisement information.

 An embodiment of the present invention provides an apparatus for acquiring routing topology information, including:

 An information receiving module, configured to receive, by using a control management channel between the control management device and a router in a region under the jurisdiction of the control management device, link state advertisement information sent by a router corresponding to the jurisdiction region;

 The topology map calculation module is configured to calculate routing topology information of the area under the control management device according to the link state advertisement information.

 The embodiment of the present invention dynamically collects the link state advertisement information of each router through the control management channel by controlling the control management channel established between the management device and the routers in the jurisdiction area, and calculates the network topology, and calculates the routers according to the network topology. The configuration of the routing table implements dynamic route calculation, control, and management, which avoids the problem of manual configuration of the routing table being complex and error-prone. DRAWINGS

 1 is a schematic diagram of a reference model of a hierarchically ordered address packet network in the prior art;

 2 is a flowchart of a method for establishing a route according to Embodiment 1 of the present invention;

 3 is a schematic diagram of a network of a dynamic inband control management channel in a hierarchically ordered address packet network according to Embodiment 1 of the present invention; FIG. 4 is a schematic diagram of a network of a dynamic outband control management channel in a hierarchically ordered address packet network according to Embodiment 1 of the present invention; FIG. 5 is a structural diagram of a system for establishing a route according to Embodiment 2 of the present invention; FIG.

 6 is a system structural diagram of a control management device as a route calculation device in a second embodiment of the present invention; FIG. 7 is a system structure diagram of a router as a route calculation device in the second embodiment of the present invention; FIG. Example 3 is a flowchart of a method for obtaining routing topology information;

 FIG. 9 is a schematic structural diagram of an apparatus for acquiring routing topology information according to Embodiment 4 of the present invention. detailed description

 The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

 Example 1

An embodiment of the present invention provides a method for establishing a dynamic route. On a hierarchical ordered address packet network (HSAPN), a CMDC Control Management Device, a control management device, and a CMD jurisdiction are established before the entire network is started. The control management channel between each HSAPN router; after that, the control management device collects all the link state advertisement messages of the area under the jurisdiction, calculates the routing topology map of the jurisdiction area, and calculates the route according to the directed graph. Table. The control management device is centralized control or a hierarchical hierarchical structure. Referring to FIG. 2, the following steps are specifically included:

 Step 101: Establish a control management channel between the CMD and each HSAPN router in the area under the CMD. The embodiments of the present invention provide the following two technical solutions to implement the establishment of a control management channel between the CMD and each HSAPN router in the jurisdiction:

 1. Establish an in-band control management channel network

 Before the whole network is started, a route to the CMD that governs each router can be manually configured on each HSAPN router. The configured route is a one-way route from the router to the control management device. The CMD route to each router can also be configured on the CMD and the HSAPN router it governs as needed, so that the route configured is a bidirectional route between the router and the control management device. A unidirectional or bidirectional routing control management channel network is formed by using a data channel between each HSAPN router and a CMD that governs each HSAPN router to form a logical, in-band routing control, route calculation. A schematic diagram of the control management channel network is shown in FIG.

 When manually configuring the control management channel, we perform initial configuration of each HSAPN router and CMD, such as the HSAPN address of the router and CMD.

 2. Establish a relatively independent network of out-of-band control management channels

 Each HSAPN router has an out-of-band interface, such as an IP interface, an Ethernet interface, etc. Each HSAPN router is connected to the CMD that governs the router through its respective out-of-band interface, thereby establishing various HSAPN routes. The out-of-band routing control, route calculation, and route management channels between the CMD and the CMD that governs the router form an out-of-band control management channel network. A schematic diagram of the control management channel network is shown in FIG.

 Before the entire HSAPN network is started, the initial configuration of each HSAPN router, such as the HSAPN address of the router, is implemented through the control management channel between each HSAPN router and CMD.

 Step 102: The CMD collects link state advertisement information of each HSAPN router in the jurisdiction area through the control management channel.

 The specific content of the link state advertisement information includes the HSAPN address of the router, the interface status of the router, the neighbor status information of the router, and the link status of the router. The neighbor status information of the router can be obtained through static configuration or automatic discovery.

 The CMD can collect link state advertisement information from each HSAPN router in the jurisdiction in the following three ways: 1. PUSH (Push;) mode: The CMD actively sends a command to collect link state advertisement information to the HSAPN router under its jurisdiction; After receiving the command, each HSAPN router sends link state advertisement information to the CMD that manages the router through the control management channel, and reports link state information.

Steps for the CMD to actively send commands to collect link state advertisement information to the HSAPN routers it governs The command for collecting link state advertisement information may be sent through a control management channel or a broadcast.

 2. PULL (drop-down;) mode: Each HSAPN router actively sends link state advertisement information to the CMD that governs the router through the control management channel, and reports link state information.

 3. Hybrid mode: It is a mixture of PUSH and PULL. When the HSAPN network system starts or needs to update the LSA information of the HSAPN router periodically, the PUSH mode is used to send the link state advertisement information to the CMD. When a single point of failure occurs (a HSAPN router fails), the PULL mode is used. Send link state advertisement information to the CMD to update the link state information of the HSAPN router in time.

 Step 103: After receiving the link state advertisement information sent by all HSAPN routers in the area under the jurisdiction, the CMD calculates a routing topology map of the area under the CMD according to the link state advertisement information. In this step, the method for calculating a routing topology map in the prior art may be used, and details are not described herein.

 Step 104: Calculate a routing table of each HSAPN router according to the routing topology map.

 The calculation and delivery of the routing table of each HSAPN router can be implemented through centralized calculation and distributed calculation:

 1. Centralized calculation method: Based on the calculated routing topology map, CMD uses the HSAPN router to be delivered as the root, and uses an algorithm, such as the shortest path first algorithm, to calculate the routing table of the HSAPN router, and sends the routing table to the routing table. Corresponding HSAPN router. It can be delivered through the broadcast or control management channel. In the actual application process, it is recommended to use the control management channel.

 2. Distribution calculation method: CMD sends the calculated routing topology map to each HSAPN router in the jurisdiction area; after receiving the routing topology map, each HSAPN router uses itself as the root and uses an algorithm such as the shortest path first algorithm. Calculate the respective routing tables.

 In the step that the CMD sends the calculated routing topology map to each HSAPN router in the jurisdiction area, the routing topology map may be sent through a control management channel or a broadcast.

 Step 105: Each HSAPN router forwards data packets according to its own routing table.

 In the embodiment of the present invention, the in-band or out-band control management channel established between the CMD and each HSAPN router in the jurisdiction area, and the CMD-to-HSAPN router link state advertisement information are implemented by using the PUSH, the PULL, and the Hybrid. The dynamic calculation and the unified calculation of the network topology implement the configuration of the routing table of each HSAPN router through centralized calculation or distributed calculation, which avoids the complicated and error-prone problem of manually configuring the routing table. Since HSAPN is a centralized control packet network, route calculation, control, and management are also centralized. Example 2

Referring to FIG. 5, this embodiment provides a system for establishing a route, where the system includes: a router, configured to establish a control management channel between the router and a control management device that governs the router; and send link state advertisement information to the control management device by using the established control management channel;

 a control management device, configured to establish a control management channel between the device and a router in the jurisdiction; collect the link state advertisement information sent by the router through the established control management channel; calculate the rule according to the received link state advertisement information Routing topology map of the area;

 The routing computing device is configured to calculate a routing table of each router according to a routing topology calculated by the control management device. As a preferred solution, the router specifically includes:

 An in-band channel establishing module, configured to configure a route between the router and the control management device by using a data channel, thereby establishing an in-band control management channel between the router and a control management device that governs the router;

 And an information sending module, configured to send link state advertisement information to the control management device by using the control management channel. The control management device specifically includes:

 An in-band channel establishing module, configured to configure a route between the control management device and the router under the jurisdiction, thereby establishing an in-band control management channel between the control management device and the managed router;

 An information receiving module, configured to receive, by using the control management channel, link state advertisement information sent by the managed router;

 The topology map calculation module is configured to calculate a routing topology map of the area under the jurisdiction according to the link state advertisement information. As another preferred solution, the router specifically includes:

 An out-of-band channel establishing module is configured to connect to a control management device that governs the router through an out-of-band interface, thereby establishing an out-of-band control management channel between the router and a control management device that governs the router;

 The information sending module is configured to send a link state advertisement message to the control management device by using the control management channel. The control management device specifically includes:

 An out-of-band channel establishing module for connecting to an out-of-band interface of the router under control to establish an in-band control management channel between the control management device and the managed router;

 An information receiving module, configured to receive, by using the control management channel, link state advertisement information sent by the managed router;

 The topology map calculation module is configured to calculate a routing topology map of the area under the jurisdiction according to the link state advertisement information. As a preferred solution, the router may send the link state advertisement information to the control management device. The control management device specifically includes:

The information receiving module is configured to receive, by using the control management channel, link state advertisement information sent by the router. As another preferred solution, the control management device may send a command to the router, and the router sends the link state advertisement information according to the command. Therefore, the control management device may further include: And a command sending module, configured to send, by using the control management channel or by broadcasting, a command for collecting link state advertisement information to a router under its jurisdiction.

 The router may include:

 The command receiving module is configured to receive a command for collecting link state advertisement information sent by a control management device of the router.

 As shown in FIG. 6, the routing computing device may be a control management device, and the control management device further includes:

 a routing table calculation module, configured to calculate, according to the calculated routing topology diagram, a routing table of the router by using a router in the area under the jurisdiction as a root;

 a routing table sending module, configured to send the routing table to a corresponding router;

 The router further includes:

 The routing table receiving module is configured to receive a routing table sent by a control management device that governs the router.

 As shown in FIG. 7, as another preferred solution, the routing computing device may be a router, and the router further includes: a routing topology receiving module, configured to receive a routing topology map calculated by the control management device that governs the router; The calculation module is configured to calculate a routing table according to the routing topology map, and the control management device further includes:

 A topology map sending module is used to send a road topology map.

 In the embodiment of the present invention, the in-band or out-band control management channel established between the CMD and each HSAPN router in the jurisdiction area, and the CMD-to-HSAPN router link state advertisement information are implemented by using the PUSH, the PULL, and the Hybrid. The dynamic calculation and the unified calculation of the network topology implement the configuration of the routing table of each HSAPN router through centralized calculation or distributed calculation, which avoids the complicated and error-prone problem of manually configuring the routing table. Since HSAPN is a centralized control packet network, route calculation, control, and management are also centralized. Example 3

 The embodiment of the invention further provides a method for obtaining routing topology information, as shown in FIG. 8, which includes:

 Step 301: Collect, by using a control management channel between the control management device and a router in the area under the jurisdiction of the control management device, link state notification information sent by a router in the area under the control management device;

 Step 302: Obtain routing topology information of the area under the control management device according to the link state advertisement information.

The routing topology information is specifically a routing topology diagram, and may be used to calculate and obtain a routing table for the router in the area under the jurisdiction of the control management device, and establish a route. Optionally, before the step 301, the method further includes: establishing, by the control management device, the corresponding control management channel between each of the routers in the area under the jurisdiction of the control management device, where the embodiment may be adopted and the embodiment The same method is used to establish the control management channel, which is not described here.

 Further, in step 301, the following three manners may be used to collect link state advertisement information: 1. PUSH mode: actively send the link state advertisement information to the HSAPN router in the area under the jurisdiction of the control management device. Commanding, and receiving the link state advertisement information returned by the HSAPN router through the corresponding control management channel after receiving the collection command; 2. PULL (pull down) mode: receiving the control of the router in the area under the jurisdiction of the control management device The link state advertisement information that the management channel actively returns; 3. Hybrid mode: It is a mixture of PUSH and PULL. When the HSAPN network system starts or needs to periodically update the LSA information of the HSAPN router, the PUSH mode is used to collect the link state advertisement information sent by the HSAPN router in the area under the control management device; when a single point of failure occurs (a HSAPN router fails) When the PULL mode is received, the router in the area under the jurisdiction of the control management device actively sends the link state advertisement information to the CMD through the corresponding control management channel, and updates the link state information of the HSAPN router in time.

 In a specific implementation, the control management device may send a command for collecting link state advertisement information to the router in the jurisdiction area by controlling the management channel or the broadcast mode.

 In the embodiment of the present invention, by controlling the control management channel established between the management device and each router in the area under its jurisdiction, the control management channel dynamically collects the link state notification information of each router and calculates the network topology, thereby facilitating the network according to the network. Topology calculates the routing table configuration of each router, implements dynamic routing calculation, control, and management, and avoids the problem of manual configuration of the routing table being complex and error-prone. Example 4

 An embodiment of the present invention provides an apparatus for acquiring routing topology information, as shown in FIG. 9, including:

 An information receiving module, configured to receive, by using a control management channel between the control management device and a router in a region under the jurisdiction of the control management device, link state advertisement information sent by a router corresponding to the jurisdiction region;

 The topology map calculation module is configured to calculate routing topology information of the area under the control management device according to the link state advertisement information.

 The routing topology information is specifically a routing topology map, and can be used to calculate and obtain a routing table for the router in the area under the jurisdiction of the control management device, and establish a route.

 Optionally, the device for obtaining the routing topology information in the embodiment of the present invention further includes: a channel establishing module, configured to establish a control management channel between the control management device and a router in a jurisdiction of the control management device.

Further, the channel establishment module is specifically: An in-band channel establishing module, configured to configure a route between the control management device and a router in a region under the jurisdiction of the control management device by using a data channel, and obtain a relationship between the control management device and a router in a region under the jurisdiction of the control management device In-band control management channel; or

 An out-of-band channel establishing module, configured to connect, by the control management device, an out-of-band interface of a router in a jurisdiction of the control management device, to obtain a relationship between the control management device and a router in a region under the jurisdiction of the control management device Out-of-band control management channel.

 Optionally, the device for obtaining routing topology information in the embodiment of the present invention further includes:

 And a command sending module, configured to send, by using the control management channel or the broadcast mode, a command for collecting link state advertisement information to a router in a region under the jurisdiction of the control management device.

 Optionally, the device for obtaining routing topology information in the embodiment of the present invention further includes:

 The topology sending module is configured to send routing topology information to a router in a region under the jurisdiction of the control management device. In the embodiment of the present invention, the in-band or out-band control management channel established between the CMD and each HSAPN router in the jurisdiction area, and the CMD-to-HSAPN router link state advertisement information are implemented by using the PUSH, the PULL, and the Hybrid. Dynamic collection, which can further realize the unified calculation of the network topology. The configuration of the routing table of each HSAPN router is realized by centralized calculation or distributed calculation, which avoids the problem that the manual configuration of the routing table is complicated and error-prone. Since HSAPN is a centralized control packet network, route calculation, control, and management are also centralized.

 The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

Claim A method for establishing a route, the method comprising:  Collecting link state advertisement information sent by the router by using a control management channel between the control management device and a router in the area under the jurisdiction of the control management device;  Calculating a routing topology map of the area under the control management device according to the link state advertisement information;  Calculating a routing table of the router in the area under the jurisdiction of the control management device according to the routing topology map.  The method for establishing a route according to claim 1, wherein the link status sent by the router is collected in a control management channel between a control management device and a router in a region under the jurisdiction of the control management device. Before the step of advertising the information, the method further includes: establishing a control management channel between the control management device and the router in the area under the control management device.  The method for establishing a route according to claim 2, wherein the establishing a control management channel between the control management device and the router in the area under the control management device includes:  Configuring a route between the router and the control management device on a router in a region where the control management device and the control management device are located, thereby establishing a connection between the control management device and a router in a region under the jurisdiction of the control management device In-band control management channel, the route being a unidirectional route from the router to the control management device; or the route is a bidirectional route from the router and the control management device.  The method for establishing a route according to claim 2, wherein the establishing a control management channel between the control management device and the router in the area under the control management device includes:  And connecting, by the control management device, an out-of-band interface of a router in the area under the control management device, thereby establishing an out-of-band control management channel between the control management device and a router in the area under the control management device.  The method for establishing a route according to claim 1 or 2, wherein the collecting, by the control management channel, the link state advertisement information sent by the router, specifically includes:  Sending a command to the router to collect link state advertisement information;  Receiving link state advertisement information sent by the router through the corresponding control management channel after receiving the command. The method for establishing a route according to claim 5, wherein the sending the command for collecting link state advertisement information to the router specifically includes: sending, by using the control management channel or a broadcast mode, the router Send a command to collect link state advertisement information.  The method for establishing a route according to claim 1 or 2, wherein the collecting, by the control management channel, the link state advertisement information sent by the router, specifically includes: Receiving a link state notification that the router actively sends to the control management device by using the control management channel Information.  The method for establishing a route according to claim 1 or 2, wherein the calculating the routing table of the router in the area under the jurisdiction of the control management device according to the routing topology map comprises:  The control management device calculates the routing table of the router by using the router in the area under the control management device as the root, and sends the routing table through the control management channel or the broadcast mode. Give the corresponding router.  The method for establishing a route according to claim 1 or 2, wherein the calculating the routing table of the router in the area under the jurisdiction of the control management device according to the routing topology map comprises:  The control management device sends the routing topology map to the router in the area under the jurisdiction through the control management channel or the broadcast mode;  After receiving the routing topology map, the router calculates its own routing table by taking itself as the root.  A system for establishing a route, the system comprising:  a router, configured to establish a control management channel between the router and a control management device that governs the router; and send the link state advertisement information to the control management device by using the control management channel;  a control management device, configured to establish a control management channel between the device and a router in the jurisdiction; collect the link state advertisement information sent by the router by using the control management channel; and calculate the location according to the link state advertisement information The topological map of the area under the jurisdiction;  The routing computing device is configured to calculate routing information of each router according to the routing topology map.  11. The system for establishing a route according to claim 10, wherein the route calculation device is a control management device or a router.  12. A method for obtaining routing topology information, comprising:  Collecting link state advertisement information sent by a router of a region under the jurisdiction of the control management device by controlling a control management channel between the management device and a router in a region under the jurisdiction of the control management device;  Obtaining routing topology information of the area under the control management device according to the link state advertisement information.  The method for obtaining routing topology information according to claim 12, wherein the control management device is collected in a control management channel between a control management device and a router in a region under the jurisdiction of the control management device Before the step of transmitting link state advertisement information by the router of the jurisdiction, the method further includes:  The corresponding control management channel is respectively established between the control management device and each router in the area under the jurisdiction of the control management device. The method for obtaining routing topology information according to claim 12 or 13, wherein the collecting and transmitting by the router is performed by a control management channel between a control management device and a router in a jurisdiction of the control management device Link status advertisement information, including:  Sending a command to the router to collect link state advertisement information;  Receiving link state advertisement information sent by the router through the corresponding control management channel after receiving the command. The method for obtaining the routing topology information according to claim 14, wherein the sending the command for collecting the link state advertisement information to the router, the method specifically includes: using the control management channel or the broadcast mode The router sends a command to collect link state advertisement information.  The method for obtaining routing topology information according to claim 12 or 13, wherein the collecting, by the control management device, a control management channel between routers of a region under the jurisdiction of the control management device Link status advertisement information, including:  Receiving link state advertisement information that the router actively sends to the control management device by using the control management channel.  17. The device for obtaining routing topology information, comprising:  An information receiving module, configured to receive, by using a control management channel between the control management device and a router in a region under the jurisdiction of the control management device, link state advertisement information sent by a router corresponding to the jurisdiction region;  The topology map calculation module is configured to calculate routing topology information of the area under the control management device according to the link state advertisement information.  The device for obtaining routing topology information according to claim 17, further comprising: a channel establishing module, configured to establish a control between the control management device and a router in a jurisdiction of the control management device Management channel.  19. The apparatus for obtaining routing topology information according to claim 18, wherein the channel establishing module is:  An in-band channel establishing module, configured to configure, by using a data channel, a route between the control management device and a router in a region under the jurisdiction of the control management device, to obtain a router of the control management device and the area under the control management device In-band control management channel; or  An out-of-band channel establishing module, configured to connect, by the control management device, an out-of-band interface of a router in a jurisdiction of the control management device, to obtain a relationship between the control management device and a router in a region under the jurisdiction of the control management device Out-of-band control management channel.  The device for acquiring routing topology information according to any one of claims 17 to 19, further comprising: a command sending module, configured to send to the control management device by using the control management channel or a broadcast mode The router in the jurisdiction sends a command to collect link state advertisement information. The device for obtaining routing topology information according to claim 20, further comprising: The topology sending module is configured to send routing topology information to a router in a region under the jurisdiction of the control management device.