CN101227310B - System, apparatus and method for obtaining multicast topology information - Google Patents
System, apparatus and method for obtaining multicast topology information Download PDFInfo
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Abstract
The invention discloses a method, a device and a system for obtaining multicast topological information, which belongs to the technical field of multicasts. The method comprises receiving multicast information from a node, confirming a multicast route between middle nodes of the multicast topological information according to unicast topological information and the multicast information, and confirming the multicast topological information according to the multicast route. The device comprises a receiving module, a multicast route confirming module, a topological information confirming module. The system comprises the node and a server. The invention combines own unicast topological information to confirm the multicast route through receiving the multicast information, thereby the multicast topological information is obtained, which is convenient for a user to manage multicast services and provides great convenience for monitoring a network, changes of the network can be known in time, risk which is existed in the network is confirmed, the network stability is increased, and the cost and difficulty for maintaining are lowered.
Description
Technical field
The present invention relates to technical field of multicast, particularly a kind of methods, devices and systems that obtain multicast topology information.
Background technology
The IP multicasting technology has been realized the efficient data transmission of IP network mid point to multiple spot, utilize the characteristic of multicast that multiple service is provided easily, comprise online live, Web TV, long-distance education, teleconference, tele-medicine, real-time video meeting or the like, some ISP (Internet Service Provider, the ISP) between the territory operation multicast carry out multicast path by with the exchange of data, and then realize complicated more multicast value-added service.Multicast service is also popularized along with market potential and demand, and multicast network from the miniaturization in past and unification gradually to scale and integrated development.
The multicast protocol that uses in the network is PIM (Protocol Independent Multicast, a Protocol Independent Multicast) agreement at present, and this agreement is carried out the forwarding of multicast on the clean culture basis.When the clean culture relevant information in the network changes or multicast router occurs must causing multicast topology to change when unusual, thereby improve the operating pressure of part network element; Work as network element in addition and carry out RPF (Reverse Path Forwarding, when inspection of reversal path) failing, can not form multicast forwarding, can reduce the reliability of network, and because network size huge, be difficult to locate at once the network element that has risk or gone wrong, thereby can normally move by traffic affecting.Therefore need monitor, administer and maintain network.
In the prior art network is monitored and management has multiple mode.Adopt NQA (Network Quality Analysis, Network Quality Analysis) mode to obtain the function and the service related information of clean culture communication apparatus.Adopt the mode of MPING (multicast PING) to check whether there is multicast group in the network.Adopt MTRACERT (multicast routing track) mode to obtain a forward-path of current multicast group.In addition, can also be Network Management Equipment reads clean culture on router relevant information, as configuration information, interface count information etc., thereby obtain the topology information of clean culture.
In realizing process of the present invention, the inventor finds that above-mentioned prior art has following shortcoming at least:
Can't read the relevant information of multicast, as multicast protocol, multicast interface message, neighbor information or the like, can not obtain the topology information of network multicast, thereby can't monitor and manage network multicast.
Summary of the invention
In order to obtain the topology information of multicast, the embodiment of the invention provides a kind of methods, devices and systems that obtain multicast topology information.Described technical scheme is as follows:
On the one hand, the embodiment of the invention provides a kind of method of obtaining multicast topology information, and described method comprises:
The multicast information that receiving node is sent, wherein, when described node was multicast router, described multicast information comprised: multicast protocol information, multicast interface message, Internet Group Management Protocol information and neighbor information;
To any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the multicast routing table, if confirm that then described path is the multicast path in the multicast routing tree; Perhaps,
To any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the transmitting multicast data table, if confirm that then described path is the multicast path in the multicast transmit tree;
Determine multicast topology information according to described multicast path.
On the other hand, the embodiment of the invention also provides a kind of device that obtains multicast topology information, and described device comprises:
Receiver module is used for the multicast information that receiving node is sent, and wherein, when described node was multicast router, described multicast information comprised: multicast protocol information, multicast interface message, Internet Group Management Protocol information and neighbor information;
Multicast path is confirmed module, be used for any two the adjacent nodes of unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the multicast routing table, if confirm that then described path is the multicast path in the multicast routing tree; Perhaps, to any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the transmitting multicast data table, if confirm that then described path is the multicast path in the multicast transmit tree; The topology information determination module is used for determining multicast topology information according to the multicast path that described multicast path affirmation module is confirmed.
On the other hand, the embodiment of the invention also provides a kind of system that obtains multicast topology information, and described system comprises:
Node is used to send multicast information, and when described node was multicast router, described multicast information comprised: multicast protocol information, multicast interface message, Internet Group Management Protocol information and neighbor information;
Server, be used to receive the multicast information that described node is sent, to any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the multicast routing table, if confirm that then described path is the multicast path in the multicast routing tree; Perhaps, to any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the transmitting multicast data table, if confirm that then described path is the multicast path in the multicast transmit tree; And determine multicast topology information according to described multicast path.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
By receiving group information, in conjunction with existing unicast topologies validation of information multicast path, thereby obtained multicast topology information, make things convenient for the user that multicast service is managed, for network monitoring provides very big convenience, the variation of awareness network in time, and the risk that exists in the affirmation network, improve network reliability, reduced maintenance cost and difficulty.
Description of drawings
Fig. 1 is the method flow diagram that obtains multicast topology information that the embodiment of the invention 1 provides;
Fig. 2 is the device that obtains multicast topology information first structure chart that the embodiment of the invention 2 provides;
Fig. 3 is the device that obtains multicast topology information second structure chart that the embodiment of the invention 2 provides;
Fig. 4 is the device that obtains multicast topology information the 3rd structure chart that the embodiment of the invention 2 provides;
Fig. 5 is the device that obtains multicast topology information the 4th structure chart that the embodiment of the invention 2 provides;
Fig. 6 is the device that obtains multicast topology information the 5th structure chart that the embodiment of the invention 2 provides;
Fig. 7 is the system that obtains multicast topology information first structure chart that the embodiment of the invention 3 provides;
Fig. 8 is the system that obtains multicast topology information second structure chart that the embodiment of the invention 3 provides;
Fig. 9 is the system that obtains multicast topology information the 3rd structure chart that the embodiment of the invention 3 provides.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The method of obtaining multicast topology information that the embodiment of the invention provides specifically comprises: the multicast information that receiving node is sent; According to unicast topologies information and described multicast information, confirm the multicast path between the node in the described unicast topologies information; Determine multicast topology information according to described multicast path.
Multicast topology information in the embodiment of the invention comprises at least a in multicast routing tree and the multicast transmit tree.Node in the embodiment of the invention is meant multicast communication equipment, includes but not limited to multicast router and multicast switch or the like.
Embodiment 1
Referring to Fig. 1, the embodiment of the invention provides a kind of method of obtaining multicast topology information, specifically comprises:
S101: node sends multicast information to server.
Wherein, node can regularly send multicast information to server, also can send multicast information to server when satisfying preset condition, sends, sends or the like when leaving multicast group during as the adding multicast group.When node was multicast router, multicast information specifically comprised multicast protocol information, multicast interface message, IGMP (Internet Group Management Protocol, Internet Group Management Protocol) information and neighbor information or the like.Under special circumstances, the multicast information that node sends also comprises other information except that comprising above-mentioned information.For example, when node was BSR (BootStrap Router, BootStrap Router) equipment, multicast information also comprised BSR information; Or when node was RP (Rendezvous Point, convergent point) equipment, multicast information also comprised RP information; Or when node for data forwarding, multicast information also comprises number that interface E-Packets and the total amount of data that E-Packets; Or when multicast topology generates or multicast topology when changing, multicast information also comprises at least one group in following two groups of information: and 1) (S, G), multicast outgoing interface and multicast incoming interface; 2) (*, G), multicast outgoing interface and multicast incoming interface; Wherein, S is that multicast source IP address, G are multicast group IP address.Comprise fixing multicast source IP address S and multicast group IP address G and multicast interface message in first group of information, comprise fixing multicast group IP address G and multicast interface message in second group of information, wherein * represents that the multicast source IP address is unfixing, promptly represents any multicast source IP address.Further, when rpf check failure appears in node, when causing situation such as flow interrupt, also initiatively send the message informing server node and go wrong.
When node was multicast switch, multicast information comprised that interface forwarding information and this node are information such as multicast switch.
S102: the multicast information that the server receiving node is sent.
S103: server is confirmed the multicast path between the node in the clean culture topology information according to unicast topologies information and multicast information;
Wherein, unicast topologies information is that server obtains in advance and preserves, by reading the information on each node, obtain comprising in unicast topologies information, this unicast topologies information outgoing interface and incoming interface information, IP address and business information or the like of each node as server after the analysis.
Server confirms that the process of multicast path specifically comprises:
To any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between these two nodes according to the multicast information of receiving multicast enabled, and there is this path in multicast routing table or the transmitting multicast data table, if then this path is a multicast path.
For example, two adjacent node A and B are arranged in the unicast topologies, there is a paths L between the interface 1 of node A and the interface 2 of Node B, at first according to the interface 2 of the interface 1 of the multicast information decision node A that receives and Node B multicast enabled whether all, if show that then this paths has the ability of multicast; Judge whether there is this path in the multicast routing table then, or judge whether there is this path in the multicast transmit tree.Wherein, if judge and have path L in the multicast routing table, as judge that interface 1 is the multicast outgoing interface in the multicast routing table of node A, and interface 2 is the multicast incoming interface in the multicast routing table of Node B, then show to have path L in the multicast routing tree, promptly path L has the ability of multicast data forwarding; Have path L in the multicast forward table if judge, then show in the multicast transmit tree to have this path, promptly this path is or just at multicast data forwarding.
When between two adjacent nodes mulitpath being arranged, confirm one by one in the manner described above, obtain the multicast path information between these two nodes, similarly, all adjacent nodes in the unicast topologies are all confirmed, then can be obtained all the multicast path information in the network.
S104: server is determined multicast topology information according to the multicast path information that obtains.
Wherein, all multicast paths that server is confirmed according to multicast routing table are formed complete multicast routing tree, this multicast routing tree be multicast path by topology information; All multicast paths that server is confirmed according to multicast forward table are formed complete multicast transmit tree, and this multicast transmit tree is the topology information of multicast forwarding.
Server can carry out operations such as multicast group inquiry or multicast neighbor retrieval after obtaining multicast topology information, and relevant information is carried out record, with the multicast topology information of monitor network.In addition, can also in the multicast topology information that obtains, obtain the multicast group path and the topology information of this appointment, the multicast group of this appointment is safeguarded according to the multicast group information of appointment.
Further, when node was prepared to send multicast information once more, said method also comprised:
Whether the multicast information that node has sent more is identical with multicast information to be sent, if identical, then sends the message that multicast information does not change to server; Otherwise, the multicast information that changes in the multicast information to be sent is sent to server;
Correspondingly, the server multicast information that changes sent of the message that do not change of the multicast information sent of receiving node or receiving node also.
Further, server is determined also to comprise after the multicast topology information:
Node regularly sends existing state information to server; When server is not regularly received existing state information or received wrong existing state information, sending query messages to this node, if do not receive the response message that this node returns, is faulty equipment with this node identification in multicast topology information then.For example, when the machine of delaying appears in certain node, multicast functionality disappearances etc. are normally the situation of converting flow the time, then can not send existing state information to server, perhaps send wrong existing state information, server transmission query messages is confirmed to this node further, if do not obtain the response message that this node returns, thinking that then this node breaks down, is faulty equipment with this node identification in multicast topology information.
Present embodiment in conjunction with existing unicast topologies validation of information multicast path, thereby has obtained multicast topology information by server receiving group information, makes things convenient for the user that multicast service is managed.Regularly send existing state information and server is confirmed accordingly by node, multicast topology information can upgrade in time.In addition, can show the node ruuning situation of collection in real time, for network monitoring provides very big convenience, the variation of awareness network in time, and the risk that exists in the affirmation network have improved network reliability, reduce maintenance cost and difficulty.
Embodiment 2
Referring to Fig. 2, the embodiment of the invention provides a kind of device that obtains multicast topology information, specifically comprises:
Multicast path is confirmed module 202, is used for the multicast information received according to unicast topologies information and receiver module 201, confirms the multicast path between the node in the clean culture topology information;
Topology information determination module 203 is used for determining multicast topology information according to the multicast path that multicast path affirmation module 202 is confirmed.
Wherein, referring to Fig. 3, multicast path confirms that module 202 can specifically comprise:
First judging unit 2021 is used for any two the adjacent nodes of unicast topologies information, and whether two interfaces that the multicast information of receiving according to receiver module is judged two path correspondences between the node multicast enabled, and this path of existence in the multicast routing table;
In addition, referring to Fig. 4, multicast path confirms that module 202 can also specifically comprise:
Further, referring to Fig. 5, said apparatus also comprises:
Unicast topologies information acquisition module 204 is used to read the information on each node, obtains unicast topologies information after the analysis, and this unicast topologies information comprises: the outgoing interface of each node and incoming interface information, IP address and business information etc.;
Correspondingly, multicast path confirms that module 202 specifically is used for the multicast information that the unicast topologies information obtained according to unicast topologies information acquisition module 204 and receiver module 201 are received, confirms the multicast path between the node in this unicast topologies information.
Further, referring to Fig. 6, said apparatus also comprises:
The device that obtains multicast topology information in the present embodiment can be a separate equipment, also can be integrated on other equipment, for example, is integrated on the server.
Present embodiment in conjunction with existing unicast topologies validation of information multicast path, thereby has obtained multicast topology information by receiving group information, makes things convenient for the user that multicast service is managed.The existing state information that regularly sends by receiving node and confirm that accordingly multicast topology information can upgrade in time.In addition, can show the node ruuning situation of collection in real time, for network monitoring provides very big convenience, the variation of awareness network in time, and the risk that exists in the affirmation network have improved network reliability, reduce maintenance cost and difficulty.
Embodiment 3
Referring to Fig. 7, the embodiment of the invention provides a kind of system that obtains multicast topology information, specifically comprises:
Further, referring to Fig. 8, above-mentioned node 301 also comprises:
In addition, referring to Fig. 9, above-mentioned node 301 also comprises:
Correspondingly, above-mentioned server 302 also comprises:
The multicast information that present embodiment is sent by the server receiving node in conjunction with existing unicast topologies validation of information multicast path, thereby has obtained multicast topology information, makes things convenient for the user that multicast service is managed.Regularly send existing state information and server is confirmed accordingly by node, multicast topology information can upgrade in time.In addition, can show the node ruuning situation of collection in real time, for network monitoring provides very big convenience, the variation of awareness network in time, and the risk that exists in the affirmation network have improved network reliability, reduce maintenance cost and difficulty.
The embodiment of the invention can utilize software to realize, corresponding software can be stored in the storage medium that can read, as in hard disk, buffer memory and the CD of multicast router or server or the like.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a method of obtaining multicast topology information is characterized in that, described method comprises:
The multicast information that receiving node is sent, wherein, when described node was multicast router, described multicast information comprised: multicast protocol information, multicast interface message, Internet Group Management Protocol information and neighbor information;
To any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the multicast routing table, if confirm that then described path is the multicast path in the multicast routing tree; Perhaps,
To any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the transmitting multicast data table, if confirm that then described path is the multicast path in the multicast transmit tree;
Determine multicast topology information according to described multicast path.
2. the method for obtaining multicast topology information according to claim 1 is characterized in that, before the multicast information that described receiving node is sent, also comprises:
Whether the multicast information that described node has sent more is identical with multicast information to be sent, if identical, then sends the message that multicast information does not change; Otherwise, send the multicast information that changes in the described multicast information to be sent;
Correspondingly, the multicast information that described receiving node is sent also comprises:
Receive the message that described multicast information do not change or receive the described multicast information that changes.
3. the method for obtaining multicast topology information according to claim 1 and 2 is characterized in that, the multicast information that described receiving node is sent is specially: regularly receive the multicast information that described node is sent; Perhaps, receive the multicast information that described node is sent satisfying when pre-conditioned.
4. the method for obtaining multicast topology information according to claim 3 is characterized in that, described pre-conditioned comprising:
Described node adds multicast group, and perhaps described node leaves multicast group.
5. the method for obtaining multicast topology information according to claim 3 is characterized in that,
When described node was BootStrap Router equipment, described multicast information also comprised: BootStrap Router information;
When described node was convergent point equipment, described multicast information also comprised: convergent point information;
When described node for data forwarding, described multicast information also comprises: number that interface E-Packets and the total amount of data that E-Packets;
When multicast topology generates or multicast topology when changing, described multicast information also comprises at least one group in following two groups of information:
Multicast source IP address, multicast group IP address, multicast outgoing interface and multicast incoming interface; With
Multicast group IP address, multicast outgoing interface and multicast incoming interface.
6. the method for obtaining multicast topology information according to claim 1 is characterized in that, described unicast topologies information comprises outgoing interface and incoming interface information, IP address and the business information of each node.
7. the method for obtaining multicast topology information according to claim 1 is characterized in that, describedly determines also to comprise after the multicast topology information according to described multicast path:
When regularly not receiving the existing state information that described node is sent or receive wrong existing state information, send query messages to described node, if do not receive the response message that described node returns, in described multicast topology information, be faulty equipment then with described node identification.
8. a device that obtains multicast topology information is characterized in that, described device comprises:
Receiver module is used for the multicast information that receiving node is sent, and wherein, when described node was multicast router, described multicast information comprised: multicast protocol information, multicast interface message, Internet Group Management Protocol information and neighbor information;
Multicast path is confirmed module, be used for any two the adjacent nodes of unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the multicast routing table, if confirm that then described path is the multicast path in the multicast routing tree; Perhaps, to any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the transmitting multicast data table, if confirm that then described path is the multicast path in the multicast transmit tree;
The topology information determination module is used for determining multicast topology information according to the multicast path that described multicast path affirmation module is confirmed.
9. the device that obtains multicast topology information according to claim 8 is characterized in that, described device also comprises:
Unicast topologies information acquisition module is used to read the information on each node, obtains unicast topologies information after the analysis; Described unicast topologies information comprises: the outgoing interface of described each node and incoming interface information, IP address and business information;
Correspondingly, described multicast path confirms that module specifically is used for the multicast information that the unicast topologies information obtained according to described unicast topologies information acquisition module and described receiver module are received, confirms the multicast path between the node in the described unicast topologies information.
10. the device that obtains multicast topology information according to claim 8 is characterized in that, described device also comprises:
Update module, the arbitrary node that is used for multicast topology information that described topology information determination module is obtained, if when regularly not receiving the existing state information that described node is sent or receiving wrong existing state information, send query messages to described node, if do not receive the response message that described node returns, in described multicast topology information, be faulty equipment then with described node identification.
11. a system that obtains multicast topology information is characterized in that, described system comprises:
Node, described node is a multicast router, is used to send multicast information, described multicast information comprises: multicast protocol information, multicast interface message, Internet Group Management Protocol information and neighbor information;
Server, be used to receive the multicast information that described node is sent, to any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the multicast routing table, if confirm that then described path is the multicast path in the multicast routing tree; Perhaps, to any two adjacent nodes in the unicast topologies information, whether two interfaces judging the path correspondence between described two nodes according to described multicast information multicast enabled, and there is described path in the transmitting multicast data table, if confirm that then described path is the multicast path in the multicast transmit tree; And determine multicast topology information according to described multicast path.
12. the system that obtains multicast topology information according to claim 11 is characterized in that, described node also comprises:
Comparison module, whether the multicast information that is used for having sent more is identical with multicast information to be sent, if identical, then notifies described server multicast information not change; If different, the multicast information that changes in the described multicast information to be sent is sent to described server.
13., it is characterized in that described node also comprises according to claim 11 or the 12 described systems that obtain multicast topology information:
Maintenance module is used for regularly sending existing state information to described server, and after receiving the query messages that described server is sent, returns response message and give described server;
Described server also comprises:
Update module, if when being used for regularly not receiving the existing state information that described maintenance module is sent or receiving wrong existing state information, send query messages to described maintenance module, if do not receive the response message that described maintenance module returns, in described multicast topology information, be faulty equipment with described node identification.
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| CN101616015B (en) * | 2009-07-24 | 2011-08-10 | 中兴通讯股份有限公司 | Method and device for obtaining multicast topology message in IP network |
| CN102244914B (en) * | 2011-07-21 | 2014-01-01 | 东北大学 | Route recognizing method applicable to multihop wireless network |
| CN105812265B (en) * | 2014-12-31 | 2019-01-08 | 北京东土科技股份有限公司 | A kind of method and device obtaining network equipment link information |
| CN106131919B (en) * | 2016-07-15 | 2019-06-11 | 中国电子科技集团公司第五十四研究所 | A kind of synchronous method of non-stop layer self-organized network topology |
| CN106210648B (en) * | 2016-08-05 | 2019-07-16 | 浙江宇视科技有限公司 | Cross-domain method of multicasting and device in a kind of video monitoring system |
| CN107181690A (en) * | 2016-12-21 | 2017-09-19 | 湖北大学 | The multicast topology mechanism and method of a kind of pervasive game equilibrium |
| CN109560973B (en) * | 2019-01-10 | 2022-02-22 | 江苏金智科技股份有限公司 | Terminal adding method and terminal deleting method for feeder automation topological link |
| CN110677822A (en) * | 2019-10-29 | 2020-01-10 | 深圳震有科技股份有限公司 | Method and system for realizing multicast function by using unicast protocol |
| CN114430388A (en) * | 2021-12-13 | 2022-05-03 | 中国船舶重工集团公司第七一六研究所 | Multicast service path visual tracking method |
| CN114866464B (en) * | 2022-05-18 | 2023-10-27 | 深圳市艾迪思特信息技术有限公司 | System for automatically discovering IP multicast domain and multicast proxy node |
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