CN101202705A - Method and router for increasing multicast reliability - Google Patents
Method and router for increasing multicast reliability Download PDFInfo
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Abstract
The invention discloses a method and a Router for enhancing the reliability of multicast, belonging to the filed of network communication. The method includes that the information for a main multicast source and a backup multicast source is collocated on the Router. When the main multicast source is normal, the router transmits the multicast data of the main multicast source; when the main multicast source is detected to be abnormal, the Router switches into the backup multicast source to transmit the multicast data of the backup multicast source. The Router includes a collocating module, a detecting module as well as a transmitting and switching module. The invention enhances the reliability of a multicast service. In an IPTV service, the invention can improve the reliability of the IPTV service and the satisfaction of an IPTV user, thus reducing the cost and bringing economic value to the operation business.
Description
Technical field
The present invention relates to network communication field, particularly a kind of method and router that strengthens multicast reliability.
Background technology
Continuous development along with internet service and IP network technology, become the inexorable trend of future IP network development based on internet carrying carrier-class business, particularly comprise voice, IPTV (Internet Protocol Television in recent years, IPTV) and the triple play service of data play (Tripple Play) business, more and more receive telecom operators and telecom equipment vendor's favor and concern.
Referring to Fig. 1, typical set of applications net mode for existing IPTV business, the detailed process that IPTV uses is as follows: BTV (Broadcast Television, radio and television) front end (being multicast business source) sends to video data stream in the IP metropolitan area network, when the user need serve, by CPE (Customer Provider Edge, user network boundary device), for example TV or computer etc., to BAS (Broadband Access Server, BAS Broadband Access Server) carries out STB (Set Top Box, set-top box) access authentication, after authentication is passed through, obtain EPG (Electronic Program Guide, electric program menu), a plurality of program channels such as BTV and Shanghai TV Station are for example arranged in the menu, the program channel that the user oneself need to select sends the request that adds channel to BAS, after BAS receives request, the video data stream based on the carrying of IP multicast message in the IP metropolitan area network is passed through DSLAM (Digital Subscriber Line Access Multiplexer, Digital Subscriber Line Access Multiplexer) is forwarded to CPE, CPE carries out playing programs, and the user just can see the program that oneself needs.In actual applications, the IP metropolitan area network can link to each other with a plurality of CPE by a plurality of BAS, and the program authority can be set, and carries out the program rights object by controllable multicast, and promptly the user just can watch the program that those are limited when satisfying the authority requirement.
As can be seen from Figure 1, the professional IP multicasting technology that adopts of IPTV is pushed to user terminal with Business Stream, method based on IP multicast message carrying IPTV video data stream, higher to real-time and reliability requirement, when the multicast source server apparatus breaks down or during link occurs fault, all can influence normally carrying out of IPTV business.
About the multicast reliability technology, two classes are arranged in the prior art, be respectively:
1. multicast source devices level reliability engineering is by setting up the multicast source cluster server, the reliability of support equipment level and robustness.Referring to Fig. 2, the multicast source server adopts Clustering, and when wherein a multicast source server broke down, other servers multicast source role of taking over fault server immediately guaranteed that multicast service does not interrupt in the cluster.
2. network level (link level) multicast reliability technology is by setting up the accessibility that the network redundancy link ensures the multicast traffic stream message forwarding path.Referring to Fig. 3, in multicast network, set up redundant link, router R1 and router R2 set up two multicast message forward-paths that can reach, can move the redundant fault detection protocol that is similar to VRRP+BFD etc. between two routers, R1 flows as primary route device multicast data forwarding when initial, R2 is as standby router, if R1 breaks down (link failure that comprises R1), then trigger R2 and take over the transmitting multicast data business by redundant fault detection protocol and routing convergence technology, this moment, R2 became the primary route device, and R1 then becomes standby router.This shows that the multicast reliability technology of network level is based on the redundancy backup detection protocol, and finish the failover of multi-cast business data stream and return and cut function in conjunction with the routing convergence technology of three-layer network.
In realizing process of the present invention, the inventor finds that there is following shortcoming at least in above-mentioned two kinds of prior aries:
1. it is concentrated relatively that multicast source devices level reliability engineering requires each multicast source server disposition, if whole cluster server network is subjected to rogue attacks, can cause multicast service to interrupt immediately, in addition the risk that can not withstand natural calamities of Clustering;
2. to the influence of multicast service, if primary route device (active link) and backup router (backup link) simultaneous faults, then multicast service can interrupt when network level (link level) multicast reliability technology can't be evaded multicast router multiple spot fault.
Summary of the invention
In order to improve the reliability of multicast service, the embodiment of the invention provides a kind of method and router that strengthens multicast reliability.Described technical scheme is as follows:
On the one hand, the embodiment of the invention provides a kind of method that strengthens multicast reliability, the information of main multicast source of configuration and backup multicast source on router, and described method comprises:
When described main multicast source just often, described router is transmitted the multicast packet of described main multicast source;
When detecting described main multicast source when unusual, described router switches to described backup multicast source, transmits the multicast packet of described backup multicast source.
On the other hand, the embodiment of the invention also provides a kind of router, and described router comprises:
Configuration module, the information that is used to dispose main multicast source and backs up multicast source;
Detection module, whether be used for regularly detecting described main multicast source unusual;
Transmit and handover module, be used for when described main multicast source just often, transmit the multicast packet of described main multicast source, when described detection module detects described main multicast source when unusual, switch to described backup multicast source, transmit the multicast packet of described backup multicast source.
The embodiment of the invention is by the information of main multicast source of configuration on router and backup multicast source, at main multicast source just often, router is transmitted the multicast data traffic of main multicast source, detect main multicast source unusual after, switch to the backup multicast source, transmit the multicast data traffic of backup multicast source, strengthened the reliability of multicast service.Owing to adopted the backup multicast source, compare with existing multicast equipment level reliability engineering, even main multicast source is subjected to rogue attacks, can not interrupt multicast service yet, reliability is improved.By on router, switching converting flow, compare with existing network level multicast reliability technology, reduced in the network multiple spot fault to the influence of multicast service.In the IPTV business, the scheme that adopts the embodiment of the invention to provide can promote IPTV availability of traffics and IPTV user's satisfaction, and reduced OPEX (Operating Expenditure for operator, operation property expenditure) cost, professional ARPU (the Average Revenue Per User of its IPTV of sustainable raising, every user's average income), for operator has brought economic worth.
Description of drawings
Fig. 1 is the schematic diagram that the typical case of IPTV business in the prior art uses networking;
Fig. 2 is the schematic diagram of multicast source devices level reliability engineering in the prior art;
Fig. 3 is the schematic diagram of network level multicast reliability technology in the prior art;
Fig. 4 is that the method flow diagram that multicast source strengthens multicast reliability is backed up in 1 of the employing that the embodiment of the invention 1 provides;
Fig. 5 is employing N the method flow diagram that backs up multicast source enhancing multicast reliability that the embodiment of the invention 2 provides;
Fig. 6 is the flow chart of multicast source abnormality detection process in the embodiment of the invention 1 and 2;
Fig. 7 is the structure chart of the router that provides of the embodiment of the invention 3.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The embodiment of the invention is by the information of main multicast source of configuration on router and backup multicast source, under normal circumstances, transmit the flow of main multicast source, when detecting main multicast source and break down, then switch to the backup multicast source, transmit the flow of backup multicast source, reach the purpose that improves multicast service (as IPTV) reliability by the multicast source backup.
Embodiment 1
Referring to Fig. 4, the embodiment of the invention provides a kind of method that strengthens multicast reliability, in the present embodiment, is that example describes to adopt 1 backup multicast source, specifically may further comprise the steps:
Step 101: on the multicast router in network the configuration main multicast source and the backup multicast source information, when main multicast source just often, router is transmitted the multicast packet of this main multicast source.
Server in main in embodiments of the present invention multicast source and the backup multicast source can be one, also can adopt Clustering, sets up a plurality of servers in main multicast source and backup multicast source.
Main multicast source and backup multicast source all have fixed IP addresses and domain name, the information of main multicast source of configuration and backup multicast source can specifically comprise on multicast router: the IP address or the domain name (being generally the IP address) of main multicast source and backup multicast source are stored in the multicast router, as be kept in the routing table, multicast router can be distinguished main multicast source and backup multicast source according to IP address or domain name; Router sends multicast to main multicast source and joins message, and joins in the multicast group of main multicast source.This moment, router had the ability of the multicast packet of transmitting main multicast source and backup multicast source, and router is transmitted the multicast packet of main multicast source in the real work, does not receive the multicast packet of backup multicast source.Wherein, when adopting Clustering, store IP address in the multicast router into and be the IP address of a multicast source that fictionalizes for cluster.
In addition, when the above-mentioned information of configuration, router can also also send multicast to the backup multicast source and join message, join in the multicast group of backup multicast source, then router is transmitted the multicast packet of main multicast source in real work, but also receive the multicast packet that backs up multicast source, but do not transmit.This mode requires at main multicast source just often, and the backup multicast source also will send multicast packet, relatively wastes the network bandwidth.
Whether step 102: it is unusual regularly to detect main multicast source, if then execution in step 103, otherwise, execution in step 107.
Main multicast source abnormality detection process can adopt regularly testing mechanism, and a sense cycle promptly is set, and whether regularly detect main multicast source according to this sense cycle unusual.
Step 103: router switches to the backup multicast source from main multicast source, transmits the multicast traffic stream of backup multicast source.
Wherein, when router in the step 101 not when the backup multicast source sends multicast and joins message, router switches to the backup multicast source, the process of transmitting the multicast traffic stream of backup multicast source specifically comprises:
Information according to the backup multicast source that disposes in the router, as back up the IP address or the domain name of multicast source, router sends multicast to the backup multicast source and joins message, join in the multicast group of backup multicast source, and switch to the backup multicast source from main multicast source, transmit the multicast data traffic of backup multicast source.Compare in the step 101 multicast group that adds the backup multicast source when initial, this mode can have delay slightly.
Step 104: regularly detect main multicast source and whether recover normally, if then execution in step 105; Otherwise, execution in step 106.
Step 105: return and switch to main multicast source from the backup multicast source, continue to transmit the multicast traffic stream of main multicast source, finish then.
Step 106: continue to transmit the multicast traffic stream of backup multicast source, finish then.
Step 107: transmit the multicast traffic stream of main multicast source, finish then.
Present embodiment is by the information of main multicast source of configuration on router and backup multicast source, at main multicast source just often, router is transmitted the multicast data traffic of main multicast source, detect main multicast source unusual after, switch to the backup multicast source, transmit the multicast data traffic of backup multicast source, strengthened the reliability of multicast service.Owing to adopted the backup multicast source, compare with existing multicast equipment level reliability engineering, even main multicast source is subjected to rogue attacks, can not interrupt multicast service yet, reliability is improved.By on router, switching converting flow, compare with existing network level multicast reliability technology, reduced in the network multiple spot fault to the influence of multicast service.Router adopts when initial when adding the multicast group of becoming owner of multicast source, also adds the mode of the multicast group of backup multicast source, can improve the efficient of switching, saves the time of switching; Adopt to add the multicast group of becoming owner of multicast source earlier, add the mode of the multicast group that backs up multicast source during switching again, the bandwidth that can save link reduces the resource that takies router.In the IPTV business, the scheme that adopts present embodiment to provide can promote IPTV availability of traffics and IPTV user's satisfaction, and for operator has reduced the OPEX cost, the professional ARPU of its IPTV of sustainable raising is for operator has brought economic worth.
Embodiment 2
Further, in the method for above-mentioned enhancing multicast reliability, the number of backup multicast source can also be a plurality of (N), referring to Fig. 5, the embodiment of the invention also provides a kind of method that strengthens multicast reliability, adopts N backup multicast source, specifically may further comprise the steps:
Step 201: the information of configuration 1 main multicast source and a plurality of backup multicast sources on multicast router, when main multicast source just often, router is transmitted the multicast traffic stream of main multicast source.
Similar with step 101, IP address or the domain name of main multicast source with each backup multicast source stored on the multicast router, router sends multicast to main multicast source and joins message, and joins in the multicast group of main multicast source; Further, router can also back up multicast source transmission multicast to each and join message, and also joins in multicast group of each backup multicast source.
Step 202: for each backup multicast source corresponding priorities is set in advance.
When priority being set for each backup multicast source, multiple set-up mode is arranged, for example, can be provided with according to the size of backup multicast source IP address, the big backup multicast source priority height in IP address is set, and it is low or the like that the little backup multicast source priority in IP address is set.
Step 203: whether unusual, if then execution in step 204 if regularly detecting main multicast source; Otherwise, execution in step 211.
Step 204: the height according to backup multicast source priority, router is switched to the non-minimum backup multicast source of priority from main multicast source, transmit the multicast traffic stream of this backup multicast source.
Wherein, if router did not send multicast to the non-minimum backup multicast source of selected priority and joined message in the step 201, then before switching, sending multicast to the non-minimum backup multicast source of selected priority earlier joins message, join in the multicast group of this backup multicast source, and then switch.Preferably, the non-minimum backup multicast source of priority can be the highest backup multicast source of priority.
Step 205: regularly whether the backup multicast source that detects after switching is unusual, if then execution in step 206; Otherwise, execution in step 207.
Step 206: select the non-minimum backup multicast source of priority to switch in remaining backup multicast source, transmit the multicast traffic stream of selected backup multicast source, execution in step 208 then.Preferably, the non-minimum backup multicast source of priority can be the highest backup multicast source of priority.
Wherein,, then before switching, join message to this backup multicast source transmission multicast earlier, join in the multicast group of this backup multicast source, and then switch if router did not send multicast to the backup multicast source of newly selecting and joins message in the step 201.
Step 207: the multicast traffic stream that continues the non-minimum backup multicast source of forwarding priority.
Step 208: regularly detect main multicast source and whether recover normally, if then execution in step 209; Otherwise, execution in step 210;
Step 209: router returned switch to main multicast source, continue to transmit the multicast traffic stream of main multicast source, finish then.
Step 210: continue to transmit the multicast traffic stream of the current backup multicast source of selecting for use, finish then.
Step 211: transmit the multicast traffic stream of main multicast source, finish then.
In the present embodiment, if the backup multicast source after switching in the step 206 is found fault in the process that regularly detects, then can initiate once more equally to switch, in remaining backup multicast source, select the non-minimum backup multicast source of priority to switch, detailed process and step 205 are similar to step 207, do not repeat them here.
Present embodiment is by the information of main multicast source of configuration on router and backup multicast source, at main multicast source just often, router is transmitted the multicast data traffic of main multicast source, detect main multicast source unusual after, switch to the backup multicast source, transmit the multicast data traffic of backup multicast source, strengthened the reliability of multicast service.Adopt a plurality of backup multicast sources,, further improved the reliability of multicast when a backup multicast source can switch to other backup multicast sources unusually.Owing to adopted the backup multicast source, compare with existing multicast equipment level reliability engineering, even main multicast source is subjected to rogue attacks, can not interrupt multicast service yet, reliability is improved.By on router, switching converting flow, compare with existing network level multicast reliability technology, reduced in the network multiple spot fault to the influence of multicast service.Router adopts when initial when adding the multicast group of becoming owner of multicast source, also adds the mode of the multicast group of backup multicast source, can improve the efficient of switching, saves the time of switching; Adopt to add the multicast group of becoming owner of multicast source earlier, add the mode of the multicast group that backs up multicast source during switching again, the bandwidth that can save link reduces the resource that takies router.In the IPTV business, the scheme that adopts present embodiment to provide can promote IPTV availability of traffics and IPTV user's satisfaction, and for operator has reduced the OPEX cost, the professional ARPU of its IPTV of sustainable raising is for operator has brought economic worth.
Regularly detect the whether unusual step of main multicast source among the foregoing description 1 (step 102) and the embodiment 2 (step 203),, can specifically comprise the steps: referring to Fig. 6
Step 301: the threshold value of multicast data traffic variation abnormality detection and the sampling period of multicast data traffic are set.
The threshold value that the flux of multicast variation abnormality detects can be set to a percentage, for example, is set to 50%.Under extreme case, also can above-mentioned threshold value be set to 100%, in this case, when interrupting, multicast source thinks just that multicast source is unusual.
Step 302:, the multicast data traffic of main multicast source is sampled according to the sampling period that is provided with.
Step 303: the multicast data traffic in adjacent two sampling periods that obtain according to sampling, calculate the multicast data traffic rate of change.
Wherein, the computational process of multicast data traffic rate of change can be specially:
The multicast data traffic and the multicast data traffic in a last sampling period in current sampling period are subtracted each other, and the ratio that will subtract each other the back gained difference and the multicast data traffic in current sampling period is as the multicast data traffic rate of change.
For example, the multicast data traffic of supposing the current sampling period is T1, and ancestral's multicast data flow of last one-period is T0 (sampling period T0=T1 first), and T1 and T0 are subtracted each other, the ratio of gained difference and T1 is as the multicast data traffic rate of change, i.e. multicast data traffic rate of change=(T1-T0)/T1.
Step 304: judge that whether the multicast data traffic rate of change is greater than the threshold value that is provided with, if then execution in step 305; Otherwise, execution in step 306.
Step 305: main multicast source takes place unusual.
Step 306: main multicast source is normal.
When switching the backup multicast source that adopts the back and carry out abnormality detection, also can adopt with above-mentioned steps 301 to the identical method of step 306, detailed process repeats no more.
Embodiment 3
Referring to Fig. 7, the embodiment of the invention also provides a kind of router, specifically comprises:
(1) configuration module, the information that is used to dispose main multicast source and backs up multicast source;
(2) detection module, whether be used for regularly detecting main multicast source unusual;
(3) transmit and handover module, be used for when main multicast source just often, transmit the multicast packet of main multicast source, when detection module detects main multicast source when unusual, switch to the backup multicast source, transmit the multicast packet of backup multicast source.
Wherein, configuration module can both join in the multicast group of main multicast source when initial configuration, joined again in the multicast group of backup multicast source, and promptly configuration module can specifically comprise:
1) memory cell, the IP address or the domain name that are used to store main multicast source and backup multicast source;
2) add the unit, be used for IP address or domain name, send multicast to main multicast source and join message, join in the multicast group of main multicast source according to the main multicast source of cell stores; And according to the IP address or the domain name of the backup multicast source of cell stores, send multicast to the backup multicast source and join message, join in the multicast group of backup multicast source.
Wherein, configuration module can only join in the multicast group of main multicast source when initial configuration, promptly specifically comprises:
1) memory cell, the IP address or the domain name that are used to store main multicast source and backup multicast source;
2) main multicast group adds the unit, is used for IP address or domain name according to the main multicast source of cell stores, sends multicast to main multicast source and joins message, and joins in the multicast group of main multicast source;
Correspondingly, forwarding and handover module can join when switching in the multicast group of backup multicast source again, and promptly forwarding and handover module can specifically comprise:
1) normal retransmission unit is used for working as main multicast source just often, transmits the multicast packet of main multicast source;
2) the backup multicast group adds the unit, is used for detecting main multicast source when unusual when detection module, and IP address or domain name according to the backup multicast source of cell stores send multicast to the backup multicast source and join message, and join in the multicast group that backs up multicast source;
3) switch retransmission unit, be used for after router joins the multicast group of backup multicast source, switching to the backup multicast source, transmit the multicast packet of backup multicast source.
Wherein, detection module can specifically comprise:
1) unit is set, is used to be provided with the sampling period of the threshold value and the multicast data traffic of multicast data traffic abnormality detection;
2) sampling unit is used for according to the sampling period that the unit setting is set the multicast data traffic of main multicast source being sampled;
3) computing unit is used for the multicast data traffic in adjacent two sampling periods of obtaining according to sampling unit sampling, calculates the multicast data traffic rate of change;
4) judging unit is used for the multicast data traffic rate of change that calculates when computing unit when the threshold value that the unit is provided with is set, and judges that main multicast source is unusual.
Wherein, computing unit can specifically comprise:
1) subtracts each other subelement, be used for the multicast data traffic that a multicast data traffic that the current sampling period of sampling unit is obtained and a last sampling period obtain and subtract each other;
2) subelement that is divided by is used for and will subtracts each other the ratio of multicast data traffic in the current sampling period that difference that subelement obtains and sampling unit obtain as the multicast data traffic rate of change.
Further, above-mentioned router can also comprise:
Return and cut forwarding module, be used for recovering just often, return and switch to main multicast source, transmit the multicast packet of main multicast source when detection module detects main multicast source.
When backup multicast source when being a plurality of, above-mentioned router can also comprise:
Priority is provided with module, is used for for each backup multicast source corresponding priorities being set in advance;
Correspondingly, above-mentioned forwarding and handover module can specifically comprise:
Normal retransmission unit is used for working as main multicast source just often, transmits the multicast packet of main multicast source;
Switch retransmission unit, be used for detecting main multicast source when unusual, switch to the non-minimum backup multicast source of priority, transmit the multicast packet that backs up multicast source when detection module;
Backup detects and switch unit, whether be used for regularly detecting the backup multicast source that switches the retransmission unit switching unusual, if, then in remaining backup multicast source, select the non-minimum backup multicast source of priority to switch, transmit the multicast packet of the backup multicast source after switching.
Present embodiment disposes the information of main multicast source and backup multicast source on router by configuration module, at main multicast source just often, router is transmitted the multicast data traffic of main multicast source, detection module detect main multicast source unusual after, switch to the backup multicast source by forwarding and handover module, transmit the multicast data traffic of backup multicast source, strengthened the reliability of multicast service.Adopt a plurality of backup multicast sources, by priority module and forwarding and handover module are set and make and to switch to other backup multicast sources unusually by a backup multicast source, further improved the reliability of multicast.Owing to adopted the backup multicast source, compare with existing multicast equipment level reliability engineering, even main multicast source is subjected to rogue attacks, can not interrupt multicast service yet, reliability is improved.By on router, switching converting flow, compare with existing network level multicast reliability technology, reduced in the network multiple spot fault to the influence of multicast service.Router adopts when initial when adding the multicast group of becoming owner of multicast source, also adds the mode of the multicast group of backup multicast source, can improve the efficient of switching, saves the time of switching; Adopt to add the multicast group of becoming owner of multicast source earlier, add the mode of the multicast group that backs up multicast source during switching again, the bandwidth that can save link reduces the resource that takies router.In the IPTV business, the scheme that adopts present embodiment to provide can promote IPTV availability of traffics and IPTV user's satisfaction, and for operator has reduced the OPEX cost, the professional ARPU of its IPTV of sustainable raising is for operator has brought economic worth.
The embodiment of the invention can realize that corresponding software can be stored in the storage medium that can read, for example in the hard disk or buffer memory of router by software.
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 (15)
1. a method that strengthens multicast reliability is characterized in that, the information of main multicast source of configuration and backup multicast source on router, and described method comprises:
When described main multicast source just often, described router is transmitted the multicast packet of described main multicast source;
When detecting described main multicast source when unusual, described router switches to described backup multicast source, transmits the multicast packet of described backup multicast source.
2. the method for enhancing multicast reliability according to claim 1 is characterized in that, the described step that disposes the information of main multicast source and backup multicast source on router specifically comprises:
The IP address or the domain name of main multicast source and backup multicast source are stored on the router;
Described router sends multicast to described main multicast source and joins message according to the IP address or the domain name of described main multicast source, joins in the multicast group of described main multicast source; And according to the IP address or the domain name of described backup multicast source, send multicast to described backup multicast source and join message, join in the multicast group of described backup multicast source.
3. the method for enhancing multicast reliability according to claim 1 is characterized in that, the described step that disposes main multicast source and backup multicast source on router specifically comprises:
The IP address or the domain name of main multicast source and backup multicast source are stored on the router;
Described router sends multicast to described main multicast source and joins message according to the IP address or the domain name of described main multicast source, joins in the multicast group of described main multicast source;
Correspondingly, described router switches to described backup multicast source, and the step of transmitting the multicast packet of described backup multicast source specifically comprises:
Described router is according to the IP address or the domain name of described backup multicast source, sending multicast to described backup multicast source joins message, join in the multicast group of described backup multicast source, switch to described backup multicast source then, transmit the multicast packet of described backup multicast source.
4. the method for enhancing multicast reliability according to claim 1 is characterized in that, the sampling period of the threshold value and the multicast data traffic of multicast data traffic abnormality detection is set, and the described unusual step of described main multicast source that detects specifically comprises:
The multicast data traffic of described main multicast source is sampled according to the described sampling period;
The multicast data traffic in adjacent two sampling periods that obtain according to described sampling is calculated the multicast data traffic rate of change;
When described multicast data traffic rate of change during greater than described threshold value, described main multicast source is unusual.
5. the method for enhancing multicast reliability according to claim 4 is characterized in that, the multicast data traffic in adjacent two sampling periods that obtain according to described sampling, and the step of calculating the multicast data traffic rate of change is specially:
The multicast data traffic and the multicast data traffic in a last sampling period in current sampling period are subtracted each other, and the ratio that will subtract each other the back gained difference and the multicast data traffic in described current sampling period is as the multicast data traffic rate of change.
6. the method for enhancing multicast reliability according to claim 1 is characterized in that, described method also comprises:
Recover just often when detecting described main multicast source, described router returns and switches to described main multicast source, transmits the multicast packet of described main multicast source.
7. the method for enhancing multicast reliability according to claim 1, it is characterized in that, when described backup multicast source when being a plurality of, for each backup multicast source corresponding priorities is set in advance, correspondingly, described router switches to described backup multicast source, and the step of transmitting the multicast packet of described backup multicast source specifically comprises:
Described router switches to the non-minimum backup multicast source of priority, transmits the multicast packet of described backup multicast source;
When detecting described backup multicast source when unusual, then in remaining backup multicast source, select the non-minimum backup multicast source of priority to switch, transmit the multicast packet of the backup multicast source after the described switching.
8. the method for enhancing multicast reliability according to claim 7 is characterized in that, the non-minimum backup multicast source of described priority is specially the highest backup multicast source of priority.
9. a router is characterized in that, described router comprises:
Configuration module, the information that is used to dispose main multicast source and backs up multicast source;
Detection module, whether be used for regularly detecting described main multicast source unusual;
Transmit and handover module, be used for when described main multicast source just often, transmit the multicast packet of described main multicast source, when described detection module detects described main multicast source when unusual, switch to described backup multicast source, transmit the multicast packet of described backup multicast source.
10. router according to claim 9 is characterized in that, described configuration module specifically comprises:
Memory cell, the IP address or the domain name that are used to store main multicast source and backup multicast source;
Add the unit, be used for IP address or domain name, send multicast to described main multicast source and join message, join in the multicast group of described main multicast source according to the main multicast source of described cell stores; And according to the IP address or the domain name of the backup multicast source of described cell stores, send multicast to described backup multicast source and join message, join in the multicast group of described backup multicast source.
11. router according to claim 9 is characterized in that, described configuration module specifically comprises:
Memory cell, the IP address or the domain name that are used to store main multicast source and backup multicast source;
Main multicast group adds the unit, is used for IP address or domain name according to the main multicast source of described cell stores, sends multicast to described main multicast source and joins message, and joins in the multicast group of described main multicast source;
Correspondingly, described forwarding and handover module specifically comprise:
Normal retransmission unit is used for working as described main multicast source just often, transmits the multicast packet of described main multicast source;
The backup multicast group adds the unit, be used for detecting described main multicast source when unusual when described detection module, according to the IP address or the domain name of the backup multicast source of described cell stores, send multicast to described backup multicast source and join message, join in the multicast group of described backup multicast source;
Switch retransmission unit, be used for after described router joins the multicast group of described backup multicast source, switch to described backup multicast source, transmit the multicast packet of described backup multicast source.
12. router according to claim 9 is characterized in that, described detection module specifically comprises:
The unit is set, is used to be provided with the sampling period of the threshold value and the multicast data traffic of multicast data traffic abnormality detection;
Sampling unit is used for according to the described sampling period that the unit setting is set the multicast data traffic of described main multicast source being sampled;
Computing unit is used for the multicast data traffic in adjacent two sampling periods that sampling obtains according to described sampling unit, calculates the multicast data traffic rate of change;
Judging unit is used for the multicast data traffic rate of change that calculates when described computing unit and when the threshold value that the unit is provided with is set, judges that described main multicast source is unusual greater than described.
13. router according to claim 12 is characterized in that, described computing unit specifically comprises:
Subtract each other subelement, be used for the multicast data traffic that a multicast data traffic that the current sampling period of described sampling unit is obtained and a last sampling period obtain and subtract each other;
The subelement that is divided by is used for ratio with described multicast data traffic of subtracting each other the current sampling period that difference that subelement obtains and described sampling unit obtain as the multicast data traffic rate of change.
14. router according to claim 9 is characterized in that, described router also comprises:
Return and cut forwarding module, be used for recovering just often, return and switch to described main multicast source, transmit the multicast packet of described main multicast source when described detection module detects described main multicast source.
15. router according to claim 9 is characterized in that, when described backup multicast source when being a plurality of, described router also comprises:
Priority is provided with module, is used for for each backup multicast source corresponding priorities being set in advance;
Correspondingly, described forwarding and handover module specifically comprise:
Normal retransmission unit is used for working as described main multicast source just often, transmits the multicast packet of described main multicast source;
Switch retransmission unit, be used for detecting described main multicast source when unusual, switch to the non-minimum backup multicast source of priority, transmit the multicast packet of described backup multicast source when described detection module;
Backup detects and switch unit, whether be used for regularly detecting the backup multicast source that described switching retransmission unit switches unusual, if, then in remaining backup multicast source, select the non-minimum backup multicast source of priority to switch, transmit the multicast packet of the backup multicast source after the described switching.
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| CNA200710120241XA CN101202705A (en) | 2007-08-14 | 2007-08-14 | Method and router for increasing multicast reliability |
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| CNA200710120241XA CN101202705A (en) | 2007-08-14 | 2007-08-14 | Method and router for increasing multicast reliability |
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| CN101202705A true CN101202705A (en) | 2008-06-18 |
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| CNA200710120241XA Pending CN101202705A (en) | 2007-08-14 | 2007-08-14 | Method and router for increasing multicast reliability |
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| CN101827025A (en) * | 2010-04-02 | 2010-09-08 | 华为技术有限公司 | Communication network multicast protection method, system and device |
| CN101902403A (en) * | 2010-07-30 | 2010-12-01 | 中国联合网络通信集团有限公司 | Method and device for enhancing reliability of multicast source |
| WO2011026437A1 (en) * | 2009-09-03 | 2011-03-10 | 华为技术有限公司 | User side multicast service primary and standby protection system, method and route device |
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| CN110601971A (en) * | 2019-09-17 | 2019-12-20 | 南京林业大学 | Data transmission method and device, electronic equipment and storage medium |
| CN110601971B (en) * | 2019-09-17 | 2021-10-26 | 南京林业大学 | Data transmission method and device, electronic equipment and storage medium |
| CN111526092A (en) * | 2020-03-18 | 2020-08-11 | 杭州迪普科技股份有限公司 | Multicast forwarding table updating method and device, electronic equipment and computer readable medium |
| CN111526092B (en) * | 2020-03-18 | 2021-12-14 | 杭州迪普科技股份有限公司 | Multicast forwarding table updating method and device, electronic equipment and computer readable medium |
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