CN100596141C - Method for establishing optimistically PIM-DM route table entry - Google Patents
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Abstract
A method for setting up PIM-DM route table item includes learning to down stream new PIM-DM router by up stream PIM-DM router , setting up pseudo multicast stream by up stream PIM-DM router and sending it to down stream new PIM-DM neighbour router , setting up multicast route table item by down stream new PIM-DM neighbour router according to received pseudo multicast stream , judging whether saidtable item is included in device multicast list or not and setting up new multicast route table item in said list as well as adding relevant retransmitting interface to refresh hardware retransmittingtable item if it is not included.
Description
Technical field
The present invention relates to the network communications technology, particularly relate to the method that agreement independent multicast-dense mode (PIM-DM, Protocol Independent Multicast-Dense Mode) router multicast list item is set up in a kind of optimization.
Background technology
Multicast routing protocol is that IP (internet protocol) network is gone up the route control protocol that realizes that multicast message is transmitted for the 3rd layer.The function of multicast routing protocol is that the forwarding for multicast message provides routing iinformation, just the multicast message of receiving should be forwarded to which direction to the forwarding engine explanation.IP multicast routing protocol commonly used at present has three types: DVMRP (distance vector multicast routing protocol), PIM-SM (sparse mode of Protocol Independent Multicast Routing Protocol) and PIM-DM (dense mode of Protocol Independent Multicast Routing Protocol).
Described PIM-DM (Protocol Independent Multicast-Dense Mode) is a multicast routing protocol a kind of and singlecast router selection protocol-independent, it does not rely on specific unicast routing protocol, be a kind of multicast routing protocol of dense mode, relatively be fit to be applied to the densely distributed network of receiving station; The PIM-DM router finds and maintenance of neighbor information that by PIM HELLO message the PIM-DM router initiatively floods by the upstream and sets up forwarding tree; For PIM-DM (S, the G) foundation of list item drive and set up with the flood multicast data flow of getting off of upstream; After the PIM-DM router is learnt new neighbours, the interface of learning these neighbours can be joined in three layers of forwarding list, multicast data flow can flood to these neighbours, and the neighbours in downstream receive that multicast data flow can set up (S, forwarding-table item G) according to the information of source address in the multicast data flow and group address; But because a large amount of multicast data flow moment floods, the router in downstream will spend the regular hour and set up (S, G) multicast routing table item, the router in downstream not only can be subjected to the multicast data flow impact of moment like this, set up forwarding-table item because downstream router will spend the regular hour simultaneously, downstream router can have certain forward delay to the forwarding of multicast data flow.Its concrete implementation procedure is:
After PIM-DM receives multicast data flow, can according in the multicast data flow (S, G) information is that index searches whether there is this (S, G) relevant multicast list in the multicast routing table; If there is no, then newly-built, and add according to the interface case in downstream and to transfer interface, the refreshing hardware forwarding-table item forwards multicast message.
Because software processes and refreshing hardware table item need the regular hour, therefore receiving that multicast flows to refreshing hardware table item and receives that during this period of time a large amount of multicast data flows can have certain impact to CPU, and multicast data flow could be transmitted by hardware after having brushed hardware table item under having only, therefore, between under hardware table item, brushing, multicast data flow all is not forwarded away, causes certain network delay and packet loss.
Summary of the invention
The technical problem that the present invention solves provides the method that the PIM-DM route table items is set up in a kind of optimization, with the impact to next stage PIM-DM router of a large amount of multicast data flows of avoiding moment in the prior art, also reduces the forwarding time delay of multicast network simultaneously.
For addressing the above problem, the invention provides the method that the PIM-DM route table items is set up in a kind of optimization, it is characterized in that, comprise step:
A, upstream PIM-DM router are learnt the new PIM-DM neighbor router in downstream;
B, upstream PIM-DM router are set up spurious multicasts stream, and described spurious multicasts stream is sent to the new PIM-DM neighbor router in downstream; Wherein, the source address of described spurious multicasts stream is the multicast source address S of the multicast routing table item of upstream PIM-DM multicast router equipment, and the group address of spurious multicasts stream is the multicast group address G of the multicast routing table item of this equipment;
C, the new PIM-DM neighbor router in downstream are set up the multicast routing table item according to the spurious multicasts stream that receives.
Described upstream PIM-DM router is learnt the new PIM-DM neighbor router in downstream by the legitimacy of judging PIM HELLO message.
If the source IP address of described PIM HELLO message exists, and is then legal, take out relevant information and control information in the described PIM HELLO message in the neighbor table that this PIM-DM router is safeguarded.
Relevant information comprises in the described PIM HELLO message: PIM neighbours' source address and these neighbours' of renewal ageing time; Described control information comprises: the port index of received this message and three layer interface index.
The implementation procedure of setting up spurious multicasts stream among the step B is:
A) PIM-DM router in upstream travels through all (S, G) multicast routing table items in this equipment;
B) (constructing a multicast source address is S for S, G) multicast routing table item, and multicast group address is the spurious multicasts stream of G for each.
The new PIM-DM neighbor router in downstream receives the multicast data flow of forgery, obtains multicast source address and multicast group address information, sets up (S, G) multicast routing table item.
Described foundation (S, G) implementation procedure of multicast routing table item is:
The new PIM-DM neighbor router in downstream is according to (S in the described multicast data flow, G) information is whether to have this (S in the multicast routing table of the new PIM-DM neighbor router in this downstream of index search, G) Xiang Guan multicast routing table item, if not, then in this multicast routing table, add described multicast routing table item, and interpolation transfers interface, refreshing hardware forwarding-table item accordingly.
In addition, the present invention also provides a kind of optimization to set up the method for PIM-DM route table items, comprises step:
A, the new PIM-DM neighbor router in downstream receive the multicast data flow of the forgery of upstream PIM-DM router transmission, obtain the multicast routing table item in the described multicast data flow; Wherein, the source address of the multicast data flow of described forgery is the multicast source address S of the multicast routing table item of upstream PIM-DM multicast router equipment, and the group address of spurious multicasts stream is the multicast group address G of the multicast routing table item of this equipment;
B, judge whether described multicast routing table item exists in the multicast routing table of the new PIM-DM neighbor router in this downstream, if do not exist, newly-built described multicast routing table item in this multicast routing table then, and add and transfer interface, refreshing hardware forwarding-table item accordingly.
Before steps A, also comprise:
Upstream PIM-DM router is learnt the new PIM-DM neighbor router in downstream;
Upstream PIM-DM router is set up spurious multicasts stream, and described spurious multicasts stream is sent to the new PIM-DM neighbor router in downstream.
The described implementation procedure of setting up spurious multicasts stream is:
C) PIM-DM router in upstream travels through all (S, G) multicast routing table items in this equipment;
D) (constructing a multicast source address is S for S, G) multicast routing table item, and multicast group address is the spurious multicasts stream of G for each.
Compared with prior art, the present invention has following beneficial effect: upstream of the present invention PIM-DM router is learnt the new PIM-DM neighbor router in downstream by PIM HELLO message; When receiving multicast data flow, (S with this equipment, G) S of multicast routing table item is as the source address of multicast data flow, G is as the multicast data flow of a forgery of group address structure of multicast data flow, and the multicast data flow of described forgery sent to the new downstream PIM neighbor router of learning, so that new PIM neighbor router is set up the multicast routing table item fast.So that when really receiving the multicast data flow that the upstream sends, transmit according to the multicast routing table item of having built up, thereby avoid PIM-DM router new in the multicast network to be subjected to the impact of upstream moment multicast data flow, can also reduce simultaneously because the multicast network forward delay that new PIM-DM router brings.
Description of drawings
Fig. 1 is the flow chart that the method for PIM-DM route table items is set up in optimization of the present invention;
Fig. 2 is another flow chart of the optimization of the present invention method of setting up the PIM-DM route table items.
Embodiment
Core of the present invention is for the PIM-DM that learns new PIM neighbours (ProtocolIndependent Multicast-Dense Mode) multicast router, (Source with this equipment, Group) multicast routing table item, form with the multicast data flow of forging is issued the new PIM neighbours that learn, so that new PIM neighbours set up the multicast routing table item fast.Be specially: when upstream PIM-DM multicast router receives multicast data flow, (S according to described multicast data flow, G) multicast source address of multicast routing table item structure is S, multicast group address is the spurious multicasts stream of G, and described spurious multicasts stream is sent to the downstream PIM-DM multicast router of having learnt; Described downstream PIM-DM multicast router receives the multicast data flow of described forgery, obtains the multicast source address in the described spurious multicasts stream, multicast group address, and with its foundation (S, G) multicast routing table item; When downstream PIM-DM multicast router receives multicast data flow, according to (the S in this multicast data flow, G) information is whether to have this (S in this multicast routing table of index search, the multicast routing table item of being correlated with G), if do not exist, then set up and be somebody's turn to do (S, G) the multicast routing table item of information, and add according to the interface case in downstream and to transfer interface, and refreshing hardware forwarding-table item; If exist, directly transmit.The method of the invention not only can avoid PIM-DM router new in the multicast network to be subjected to the impact of upstream moment multicast data flow, can also reduce because the multicast network forward delay that new PIM-DM router brings.
The present invention is described further below in conjunction with accompanying drawing.
Please refer to Fig. 1, set up the flow chart of the method for PIM-DM route table items for optimization of the present invention.Described method comprises:
Step S11: upstream PIM-DM router is learnt the new PIM-DM neighbor router in downstream;
Step S12: upstream PIM-DM router is set up spurious multicasts stream, and described spurious multicasts stream is sent to the new PIM-DM neighbor router in downstream;
Step S12: the new PIM-DM neighbor router in downstream is set up the multicast routing table item according to the spurious multicasts stream that receives.
For the ease of the understanding of the present invention, earlier with reference to following content.In the PIM-DM territory, the router of operation PIM-DM agreement periodically sends the HELLO message, learn the PIM neighbor router in downstream, carry out the judgement of leaf network, leaf route, and be responsible in multiple access, electing in the network multicast router (DR) of appointment.Wherein, described PIM HELLO message is meant that mainly the PIM router enables the handshake message that periodically sends after the PIM function, is used for finding and maintenance of neighbor information; After the PIM router is received PIM HELLO message, take out the source address in this message, the i.e. sender's of this PIM HELLO IP address, whether the PIM router is searched this sender in the neighbor list of this equipment IP address exists, if exist explanation to learn these neighbours; If no, then this IP address is joined in the neighbor list.Described multicast data flow is the data message of transport multicast business, comprises multicast source address, information such as multicast group address.Described (S, G) the multicast routing table item is meant multicast router according to receiving the information of multicast data flow, set up based on the multicast path of multicast source address and multicast group address by forwarding-table item.
In step S11, when upstream PIM-DM router receives the HELLO message, by checking the legitimacy of PIM HELLO message, judge whether to learn the PIM-DM router in downstream, if the source IP address of this PIM HELLO message, in the neighbor list that this PIM router is safeguarded, be exactly legal, then take out relevant information in the PIM HELLO message,, be used to upgrade the ageing time of this neighbours' source address such as PIM neighbours' source address, ageing time; In addition, also should take out the control information of PIM HELLO message association, such as the port index of receiving this PIM HELLO message, three layer interface index or the like; Which concrete port described three layer interface index are used to be identified on has been learnt this PIM neighbours.Promptly this upstream PIM-DM router is learnt the new PIM-DM neighbor router in downstream.If not conforming to rule need not handle.
And in step S12, when the PIM-DM of upstream router receives multicast data flow, set up the multicast data flow of forging earlier, and the multicast data flow of described forgery is sent to the downstream learn new PIM neighbor router, wherein, the content of described spurious multicasts stream must comprise: multicast source address S, multicast group address G, promptly with the source address of S as counterfeit message, G forges a multicast data flow as the group address of counterfeit message, but the content of the multicast data flow of described forgery is not to include only multicast source address S, multicast group address G can also comprise other content, such as TTL etc.Wherein, the described implementation procedure of setting up multicast data flow is: upstream PIM-DM router travels through all (S, G) multicast routing table items in the multicast routing table of this equipment; And according to each (constructing a multicast source address is S for S, G) multicast routing table item, and the multicast destination address is the spurious multicasts stream of G; And the multicast data flow of described forgery sent to the new downstream PIM neighbor router of learning.
The new neighbours PIM-DM router in described downstream receives the multicast data flow of forgery, and sets up the multicast routing table item according to the multicast data flow information of forging.Its specific implementation process is: the new neighbours PIM-DM router in downstream is according to the information of the spurious multicasts stream of receiving, take out wherein multicast source address S and the information of multicast group address G, set up (S, multicast routing table item G), and the hardware route forwarding table is set.Described foundation (S, the process of multicast routing table item G) is: after the new neighbours PIM-DM router in downstream receives multicast data flow, with in the multicast data flow (S, G) information is that index searches whether there is this (S, G) relevant multicast routing table item in this equipment in the multicast routing table; If there is no, then setting up in multicast routing table should (S, G) multicast routing table item, and add according to the interface case in downstream and to transfer interface, refreshing hardware forwarding-table item.
The new neighbours PIM-DM router in described downstream is not before receiving the real multicast data flow of upstream PIM-DM router, set up (S, G) multicast routing table item, when receiving described multicast data flow, directly can be according to (the S that has set up, G) the multicast routing table item is transmitted, thereby avoids new PIM-DM router to be subjected to the impact of upstream moment multicast data flow, has reduced the forwarded delay simultaneously.
In addition, the method that the present invention also provides a kind of optimization to set up the PIM-DM route table items, its flow chart sees Fig. 2 for details.Described method comprises step:
Step M11: the new PIM-DM neighbor router in downstream receives the multicast data flow of forgery, obtains the multicast routing table item in the described multicast data flow;
Step M12: judge whether described multicast routing table item exists in the multicast routing table of this equipment, if do not exist, newly-built described multicast routing table item in this multicast routing table then, and add and transfer interface, refreshing hardware forwarding-table item accordingly.
At step M11: also comprise: upstream PIM-DM router is learnt the new PIM-DM neighbours' multicast router in downstream before; Upstream PIM-DM router is set up spurious multicasts stream, and described spurious multicasts stream is sent to the new PIM-DM neighbor router in downstream.
The described implementation procedure of setting up spurious multicasts stream is: upstream PIM-DM router travels through all (S, G) multicast routing table items in this equipment; And according to each (constructing a multicast source address is S for S, G) multicast routing table item, and multicast group address is the spurious multicasts stream of G.
The specific implementation of above steps can not repeat them here with reference to the implementation procedure of method noted earlier.
This shows, the present invention learns the PIM-DM neighbor router of new PIM for upstream PIM-DM router, will be according to (the S of this equipment, G) S of multicast routing table item is as the source address of multicast data flow, G is as the multicast data flow of a forgery of group address structure of multicast data flow, and the multicast data flow of described forgery sent to the new downstream PIM neighbor router of learning, so that new PIM neighbor router is set up the multicast routing table item fast.So that when really receiving the multicast data flow that the upstream sends, transmit according to the multicast routing table item of having built up, thereby avoid PIM-DM router new in the multicast network to be subjected to the impact of upstream moment multicast data flow, can also reduce simultaneously because the multicast network forward delay that new PIM-DM router brings.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1, the method for PIM-DM route table items is set up in a kind of optimization, it is characterized in that, comprises step:
A, upstream PIM-DM router are learnt the new PIM-DM neighbor router in downstream;
B, upstream PIM-DM router are set up spurious multicasts stream, and described spurious multicasts stream is sent to the new PIM-DM neighbor router in downstream; Wherein, the source address of described spurious multicasts stream is the multicast source address S of the multicast routing table item of upstream PIM-DM multicast router equipment, and the group address of spurious multicasts stream is the multicast group address G of the multicast routing table item of this equipment;
C, the new PIM-DM neighbor router in downstream are set up the multicast routing table item according to the spurious multicasts stream that receives.
2, the method for PIM-DM route table items is set up in described optimization according to claim 1, it is characterized in that, upstream PIM-DM router is learnt the new PIM-DM neighbor router in downstream by the legitimacy of judging PIM HELLO message.
3, the method for PIM-DM route table items is set up in described optimization according to claim 2, it is characterized in that, if the source IP address of described PIM HELLO message exists, and is then legal, take out relevant information and control information in the described PIM HELLO message in the neighbor table that this PIM-DM router is safeguarded.
4, the method for PIM-DM route table items is set up in described optimization according to claim 3, it is characterized in that relevant information comprises in the described PIM HELLO message: PIM neighbours' source address and upgrade this neighbours' ageing time; Described control information comprises: the port index of received this message and three layer interface index.
5, the method for PIM-DM route table items is set up in described optimization according to claim 1, it is characterized in that, the implementation procedure of setting up spurious multicasts stream among the step B is:
A) PIM-DM router in upstream travels through all (S, G) multicast routing table items in this equipment;
B) (constructing a multicast source address is S for S, G) multicast routing table item, and multicast group address is the spurious multicasts stream of G for each.
6, the method for PIM-DM route table items is set up in described optimization according to claim 1, it is characterized in that the new PIM-DM neighbor router in downstream receives the multicast data flow of forgery, obtains multicast source address and multicast group address information, sets up (S, G) multicast routing table item.
7, the method for PIM-DM route table items is set up in described optimization according to claim 6, it is characterized in that, described foundation (S, G) implementation procedure of multicast routing table item is:
The new PIM-DM neighbor router in downstream is according to (S in the described multicast data flow, G) information is whether to have this (S in the multicast routing table of the new PIM-DM neighbor router in this downstream of index search, G) Xiang Guan multicast routing table item, if not, then in this multicast routing table, add described multicast routing table item, and interpolation transfers interface, refreshing hardware forwarding-table item accordingly.
8, the method for PIM-DM route table items is set up in a kind of optimization, it is characterized in that, comprises step:
A, the new PIM-DM neighbor router in downstream receive the multicast data flow of the forgery of upstream PIM-DM router transmission, obtain the multicast routing table item in the described multicast data flow; Wherein, the source address of the multicast data flow of described forgery is the multicast source address S of the multicast routing table item of upstream PIM-DM multicast router equipment, and the group address of spurious multicasts stream is the multicast group address G of the multicast routing table item of this equipment;
B, judge whether described multicast routing table item exists in the multicast routing table of the new PIM-DM neighbor router in this downstream, if do not exist, newly-built described multicast routing table item in this multicast routing table then, and add and transfer interface, refreshing hardware forwarding-table item accordingly.
9, the method for PIM-DM route table items is set up in described according to Claim 8 optimization, it is characterized in that, also comprises before steps A:
Upstream PIM-DM router is learnt the new PIM-DM neighbor router in downstream;
Upstream PIM-DM router is set up spurious multicasts stream, and described spurious multicasts stream is sent to the new PIM-DM neighbor router in downstream.
10, the method for PIM-DM route table items is set up in described optimization according to claim 9, it is characterized in that, the described implementation procedure of setting up spurious multicasts stream is:
C) PIM-DM router in upstream travels through all (S, G) multicast routing table items in this equipment; D) (constructing a multicast source address is S for S, G) multicast routing table item, and multicast group address is the spurious multicasts stream of G for each.
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| CN101035063A (en) * | 2006-03-07 | 2007-09-12 | 华为技术有限公司 | Multicast flow forwarding method and its router and system |
| CN100542142C (en) * | 2007-04-04 | 2009-09-16 | 华为技术有限公司 | Change the method and apparatus of three-layer network appliance Interface status |
| CN101291242B (en) * | 2008-06-17 | 2012-03-14 | 杭州华三通信技术有限公司 | Method, system and apparatus for PIM DM to support bandwidth reservation and establishing multicast list |
| CN101800742B (en) * | 2010-01-28 | 2012-12-19 | 华为技术有限公司 | Method for updating and processing upstream information of routing device, routing devices and network system |
| CN103685035B (en) * | 2012-09-26 | 2018-04-27 | 深圳市腾讯计算机系统有限公司 | Route renewing method, interchanger and system |
| CN103581027B (en) * | 2013-09-06 | 2017-06-16 | 上海斐讯数据通信技术有限公司 | A kind of method that optimization PIM SM Multicast Routings are set up |
| CN104702513A (en) * | 2013-12-10 | 2015-06-10 | 重庆金美通信有限责任公司 | Improved method for deploying PIM-DM in narrow-band network |
| CN107171883B (en) * | 2016-03-08 | 2020-04-28 | 华为技术有限公司 | Method, device and equipment for detecting forwarding table |
| CN108600110B (en) * | 2018-04-24 | 2020-12-29 | 新华三技术有限公司 | PIM message processing method and device |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: NEW H3C TECHNOLOGIES Co.,Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: HANGZHOU H3C TECHNOLOGIES Co.,Ltd. |
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Granted publication date: 20100324 |