CN102158405B - Method and device for establishing multicast forwarding table entry in bidirectional protocol independent multicast (PIM) network - Google Patents
Method and device for establishing multicast forwarding table entry in bidirectional protocol independent multicast (PIM) network Download PDFInfo
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- CN102158405B CN102158405B CN201110080252.6A CN201110080252A CN102158405B CN 102158405 B CN102158405 B CN 102158405B CN 201110080252 A CN201110080252 A CN 201110080252A CN 102158405 B CN102158405 B CN 102158405B
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Abstract
The invention discloses a method and device for establishing a multicast forwarding table entry in a bidirectional protocol independent multicast (PIM) network. In the method, a directly-connected device of a bidirectional PIM multicast source receives first protocol messages from the multicast source aiming at a multicast group G; a table entry (*,G) is established in accordance with the protocol messages; an outbound interface of the table entry is the RPF interface of the directly-connected device, and second protocol messages are sent from the RPF interface along an RP direction; the second protocol messages are used for indicating upstream equipment to establish a table entry (*,G), and an outbound interface of the table entry is the RPF interface of the upstream equipment; and the first protocol messages are sent before the bidirectional PIM multicast source sends multicast streams aiming at the multicast group G. According to the method and device provided by the invention, the bidirectional PIM forwarding efficiency is improved.
Description
Technical field
The present invention relates to technical field of multicast, be specifically related to multicast forwarding list item method for building up and equipment in bidirectional protocol independent multicast (PIM, ProtocolIndependent Multicast) network.
Background technology
Bidirectional protocol independent multicast (PIM, Protocol Independent Multicast) agreement hypothesis multicast source is also recipient simultaneously, is applicable to the scenes such as video conference.But in actual networking, multicast source is to point (RP, Rendezvous Point) path on not necessarily have recipient, but for flow can forward smoothly, multicast source could forwarding multicast flow to the forwarding-table item that needs to set up corresponding group on the path of RP.
Fig. 1 has provided the networking exemplary plot of an existing bidirectional pim, as shown in Figure 1, in networking, there are 2 recipients, according to bidirectional pim agreement, it is the interface nearest to RP that the reverse path of (*, G) list item forwards (RPF, Reverse Path Forwarding) interface, first multicast data flow can send to RP, then is transmitted to recipient.Recipient is joined message to trigger by Internet Group Management Protocol (IGMP, Internet Group Management Protocol) and PIM to (*, G) list item of RP and sets up, and flows for forwarding multicasting.Sender also needs by (* to RP, G) list item carrys out forwarding multicasting stream, can not adopt traditional PIM-sparse mode (SM, Sparse Mode) and PIM-dense mode (DM, Dense Mode) mode of unicast, affect efficiency.
Current industry is adopted the mode of Current drive and to the link of RP, is set up (*, G) list item at multicast source.Stream type of drive can cause larger impact to equipment, and could forward after list item is set up, and needs equipment buffer memory to wait for, has the possibility of time delay and packet loss.
Summary of the invention
The invention provides multicast forwarding list item method for building up and equipment in bidirectional pim network, to improve bidirectional pim forward efficiency.
Technical scheme of the present invention is achieved in that
Multicast forwarding list item method for building up in a kind of bidirectional protocol independent multicast PIM network, the method comprises:
The first protocol massages for multicast group G that send in the direct-connected device receiving group source of bidirectional pim multicast source, set up (* according to this protocol massages, G) list item, the outgoing interface of this list item is that the reverse path of direct-connected device forwards RPF interface, and send second protocol message from described RPF interface to point RP direction, described second protocol message is used to indicate upstream equipment and sets up (*, G) list item, the RPF interface that the outgoing interface of this list item is upstream equipment; Wherein, the first protocol massages is that bidirectional pim multicast source sends before the multicast data flow sending for described multicast group G.
Described the first protocol massages is: IGMPv1 report message, wherein, the Unused field of this message represents that this message is used to indicate direct-connected device and sets up (*, G) list item that outgoing interface is RPF interface.
Described second protocol message is: PIM joins message, and wherein, second Reserved field of this message represents that this message is used to indicate upstream equipment and sets up (*, G) list item that outgoing interface is RPF interface.
Multicast forwarding list item method for building up in a kind of bidirectional pim network, the method comprises:
The second protocol message for multicast group G that the direct-connected device of upstream equipment reception bidirectional pim multicast source is sent, set up (* according to this protocol massages, G) list item, the outgoing interface of this list item is the RPF interface of this upstream equipment, and forwards second protocol message from described RPF interface to RP direction.
Described second protocol message is: PIM joins message, and wherein, second Reserved field of this message represents that this message is used to indicate described upstream equipment and sets up (*, G) list item that outgoing interface is RPF interface.
A direct-connected device for bidirectional pim multicast source, on the path between bidirectional pim multicast source and RP, this equipment comprises:
Protocol massages transceiver module: receive the first protocol massages for a multicast group G that bidirectional pim multicast source is sent, send to list item to set up module this message, send second protocol message from the RPF interface of self to RP direction simultaneously, described second protocol message is used to indicate upstream equipment and sets up (*, G) list item, the RPF interface that the outgoing interface of this list item is upstream equipment; Wherein, the first protocol massages is that bidirectional pim multicast source sends before the multicast data flow sending for described multicast group G;
List item is set up module: receive the first protocol massages that protocol massages transceiver module is sent, set up (*, G) list item, the RPF interface that the outgoing interface of this list item is this equipment according to this message.
A kind of upstream equipment, on the path between direct-connected device and the RP of bidirectional pim multicast source, this upstream equipment comprises:
Protocol massages transceiver module: receive the second protocol message for a multicast group G from the direct-connected device direction of bidirectional pim multicast source, send to list item to set up module this message, forward second protocol message from the RPF interface of self to RP direction simultaneously;
List item is set up module: receive the second protocol message that protocol massages transceiver module is sent, set up (*, G) list item, the RPF interface that the outgoing interface of this list item is this equipment according to this protocol massages.
A kind of bidirectional pim multicast source, comprise: the first module, for before the multicast data flow that will send for a multicast group G, send first protocol massages for this multicast group G, this message is used to indicate the receiving equipment of this message and sets up (*, G) list item that outgoing interface is RPF interface.
Compared with prior art, in the present invention, bidirectional pim multicast source first sends first protocol massages for multicast group G before sending for the multicast data flow of a multicast group G, set up (* with the equipment triggering between this multicast source and RP, G) list item, thereby avoid the periodic impact of mass data message to equipment, and do not needed equipment buffer memory to wait for, reduced the possibility of time delay and packet loss; Set up (*, G) list item by controlling message instead of multicast data flow simultaneously, make the foundation of list item more efficient, controlled, in the time of unit exception, also can accelerate the removing of list item.
Brief description of the drawings
Fig. 1 is the networking exemplary plot of existing bidirectional pim;
The flow chart of multicast forwarding list item method for building up in the bidirectional pim network that Fig. 2 provides for the embodiment of the present invention;
The composition diagram of the direct-connected device of the bidirectional pim multicast source that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
The flow chart of multicast forwarding list item method for building up in the bidirectional pim network that Fig. 2 provides for the embodiment of the present invention, as shown in Figure 2, its concrete steps are as follows:
Step 201: bidirectional pim multicast source, before the multicast data flow sending for a multicast group G, sends IGMPv1 report (Report) message, carries multicast group G address in this message, and the IGMP that simultaneously carries bidirectional pim multicast source adds instruction.
In the present embodiment, multicast source is starting a bidirectional pim application, as: while starting a video conference, just send immediately an IGMPv1Report message.
The form of IGMPv1Report message is as follows:
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
| Version| Type| Unused| Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
| Group Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
In the present embodiment, implication and the value of each field are as follows:
Version:IGMP version number, here, value is 1, is expressed as IGMPv1;
Type: type of message, here, value is 0x2, is expressed as query message;
Unused: this field for not using field, in the present embodiment, is used this field to represent that the IGMP of bidirectional pim multicast source adds in existing IGMPv1 Report message, here, can value be 0x07.
Step 202:IGMPv1 Report message arrives the direct-connected device of multicast source, this equipment is set up (* according to this message, G) list item, the RPF interface of self is added to the outgoing interface of this list item simultaneously, and the attribute of this outgoing interface is made as to IGMPv1*, and adding (Join) message from the RPF interface transmission PIM of self, PIM Join message carries multicast group G address.
Here the attribute of outgoing interface being made as to IGMPv1* is in order to distinguish with the attribute of existing list item outgoing interface, if certainly do not distinguished, consistent also no problem with the setup of attribute of existing outgoing interface.
In the present embodiment, for PIM Join message and existing PIM Join message are distinguished, need to modify to PIM Join message, specific as follows:
The form of PIM Join message is as follows:
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
| PIM Ver | Type | Reserved | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
| Encoded-Unicast-Upstream Neighbor Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
| Reserved | Num groups | Holdtime |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
In the present embodiment, use second Reserved field, the Reserved field before Num groups represents that this PIM Join message is to be triggered by the IGMPv1 Report message of expanding, and here, can value be 0x07.
Step 203: the upstream equipment of the direct-connected device of multicast source receives PIM Join message, sets up (*, G) list item according to this message, the RPF interface of self is added to the outgoing interface of this list item simultaneously, and the attribute of this outgoing interface is made as to PIM
*, and sending PIM Join message from the RPF interface of self, PIMJoin message carries multicast group G address.
Here " upstream equipment of the direct-connected device of multicast source " refer to from the direct-connected device of multicast source to RP by way of First equipment.
For the direct-connected device from multicast source to RP by way of arbitrary equipment, this equipment receives after PIMJoin message, all can carry out the processing of step 203, PIM Join message finally can arrive RP.
Certainly, the attribute of outgoing interface and the setup of attribute of existing outgoing interface are consistent also no problem here.
PIM Join message in this step is identical with step 202, and second Reserved field list need to be shown to this message is to be triggered by the IGMPv1 Report message of expanding, and can value be 0x07.
Step 204:RP receives PIM Join message.
In the present embodiment, applying IGMPv1 Report message and PIM Join message, to indicate adding of multicast source be a kind of than execution mode preferably, can reach reasonable fusion with existing multicast protocol.If only from realizing object of the present invention, also can not use IGMPv1 Report message and PIMJoin message, as long as this message can be received the equipment of this message and identify, and sets up (*, the G) list item taking RPF as outgoing interface according to this message.So, can complete above-mentioned effect by self-defined a kind of protocol massages completely.
After this,, when multicast source sends after the multicast data flow for multicast group G, just carry out the forwarding of multicast data flow according to (*, G) list item of setting up at multicast source to the equipment on RP path.Particularly, when the multicast data flow that multicast source sends arrives the equipment of each operation bidirectional pim agreement of upstream, these equipment are according to the outgoing interface of (*, G) list item corresponding to multicast group G, multicast data flow is forwarded from RPF interface, and final multicast data flow has arrived RP.
Existing employing stream type of drive generates in the situation of (*, G) list item of bidirectional pim, if multicast source is hung up extremely, (*, G) list item need to wait for that 210s is aging.In the embodiment of the present invention, use IGMPv1 message to generate (*, G) list item, if multicast source is hung up extremely, the ageing time of (*, G) list item can shorten to 120s.
The composition diagram of the direct-connected device of the bidirectional pim multicast source that Fig. 3 provides for the embodiment of the present invention, this direct-connected device is on the path between bidirectional pim multicast source and RP, as shown in Figure 3, it mainly comprises: protocol massages transceiver module 31, list item are set up module 32, list item memory module 33 and flow forwarding module 34, wherein:
Protocol massages transceiver module 31: receive and join message from the bidirectional pim multicast source IGMP for a multicast group G of bidirectional pim multicast source, send to list item to set up module 32 this message, send bidirectional pim multicast source PIM from the RPF interface of this equipment joins message simultaneously, wherein, described bidirectional pim multicast source IGMP joins message and before multicast data flow for described multicast group G, sends sending for bidirectional pim multicast source.
List item is set up module 32: the bidirectional pim multicast source IGMP for multicast group G that reception protocol massages transceiver module 31 is sent joins message, set up (* according to this message, G) list item, the RPF interface of this equipment is added to the outgoing interface of this list item, (*, G) list item is saved in list item memory module 33.
List item memory module 33: storage (*, G) list item.
Flow forwarding module 34: receive the multicast data flow that bidirectional pim multicast source is sent, search (*, G) list item corresponding to this multicast data flow in list item memory module 33, according to the outgoing interface of this (*, G) list item, this multicast data flow is forwarded.
Below provide the composition of the upstream equipment that the embodiment of the present invention provides, this upstream equipment is on the path between direct-connected device and the RP of bidirectional pim multicast source, this upstream equipment mainly comprises: protocol massages transceiver module, list item are set up module, list item memory module and flow forwarding module, wherein:
Protocol massages transceiver module: reception joins message from the bidirectional pim multicast source PIM for a multicast group G of the direct-connected device direction of bidirectional pim multicast source, sends to list item to set up module this message, forwards this message from the RPF interface of this equipment simultaneously.
List item is set up module: the bidirectional pim multicast source PIM for multicast group G that reception protocol massages transceiver module is sent joins message, set up (* according to this message, G) list item, the RPF interface of this equipment is added to the outgoing interface of this list item, (*, G) list item is saved in list item memory module.
List item memory module: storage (*, G) list item.
Flow forwarding module: receive the multicast data flow that bidirectional pim multicast source is sent, search (*, G) list item corresponding to this multicast data flow in list item memory module, according to the outgoing interface of this (*, G) list item, this multicast data flow is forwarded.
Below provide the composition of the bidirectional pim multicast source that the embodiment of the present invention provides, this bidirectional pim multicast source comprises: the first module, for before the multicast data flow that will send for a multicast group G, send a bidirectional pim multicast source for this multicast group G and join message.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (7)
1. a multicast forwarding list item method for building up in bidirectional protocol independent multicast PIM network, is characterized in that, the method comprises:
The first protocol massages for multicast group G that send in the direct-connected device receiving group source of bidirectional pim multicast source, set up (* according to this protocol massages, G) list item, the outgoing interface of this list item is that the reverse path of direct-connected device forwards RPF interface, and send second protocol message from described RPF interface to point RP direction, so that: receive described second protocol message to arbitrary equipment of RP institute approach from the direct-connected device of multicast source, set up (* according to this second protocol message, G) list item, the outgoing interface of this list item is the RPF interface of this equipment, and this second protocol message finally can arrive RP, wherein, the first protocol massages is that bidirectional pim multicast source sends before the multicast data flow sending for described multicast group G.
2. method according to claim 1, is characterized in that, described the first protocol massages is: IGMPv1 report message, wherein, the Unused field of this message represents that this message is used to indicate direct-connected device and sets up (*, G) list item that outgoing interface is RPF interface.
3. method according to claim 1, it is characterized in that, described second protocol message is: PIM joins message, wherein, second Reserved field of this message represents that this message is used to indicate upstream equipment and sets up (*, G) list item that outgoing interface is RPF interface.
4. a multicast forwarding list item method for building up in bidirectional pim network, is characterized in that, the method comprises:
The second protocol message for multicast group G that the direct-connected device of upstream equipment reception bidirectional pim multicast source is sent, set up (* according to this protocol massages, G) list item, the RPF interface that the outgoing interface of this list item is this upstream equipment, and forward second protocol message from described RPF interface to RP direction; Described second protocol message is to send after described direct-connected device receives the first protocol massages for multicast group G that bidirectional pim multicast source sends, and described the first protocol massages is that bidirectional pim multicast source sends before the multicast data flow sending for described multicast group G.
5. method according to claim 4, it is characterized in that, described second protocol message is: PIM joins message, wherein, second Reserved field of this message represents that this message is used to indicate described upstream equipment and sets up (*, G) list item that outgoing interface is RPF interface.
6. a direct-connected device for bidirectional pim multicast source, on the path between bidirectional pim multicast source and RP, is characterized in that, this equipment comprises:
Protocol massages transceiver module: receive the first protocol massages for a multicast group G that bidirectional pim multicast source is sent, send to list item to set up module this message, send second protocol message from the RPF interface of self to RP direction simultaneously, so that: receive described second protocol message to arbitrary equipment of RP institute approach from the direct-connected device of multicast source, set up (* according to this second protocol message, G) list item, the outgoing interface of this list item is the RPF interface of this equipment, and this second protocol message finally can arrive RP; Wherein, the first protocol massages is that bidirectional pim multicast source sends before the multicast data flow sending for described multicast group G;
List item is set up module: receive the first protocol massages that protocol massages transceiver module is sent, set up (*, G) list item, the RPF interface that the outgoing interface of this list item is this equipment according to this message.
7. a upstream equipment, on the path between direct-connected device and the RP of bidirectional pim multicast source, is characterized in that, this upstream equipment comprises:
Protocol massages transceiver module: receive the second protocol message for a multicast group G from the direct-connected device direction of bidirectional pim multicast source, send to list item to set up module this message, forward second protocol message from the RPF interface of self to RP direction simultaneously, described second protocol message is to send after described direct-connected device receives the first protocol massages for multicast group G that bidirectional pim multicast source sends, and described the first protocol massages is that bidirectional pim multicast source sends before the multicast data flow sending for described multicast group G;
List item is set up module: receive the second protocol message that protocol massages transceiver module is sent, set up (*, G) list item, the RPF interface that the outgoing interface of this list item is this equipment according to this protocol massages.
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| CN101309163A (en) * | 2008-07-15 | 2008-11-19 | 杭州华三通信技术有限公司 | Method and apparatus for PIM SM protocol supporting automatic smoothing of multicast flow |
| CN101867528A (en) * | 2010-06-25 | 2010-10-20 | 北京星网锐捷网络技术有限公司 | Multicast service processing method and device |
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| CN101309163A (en) * | 2008-07-15 | 2008-11-19 | 杭州华三通信技术有限公司 | Method and apparatus for PIM SM protocol supporting automatic smoothing of multicast flow |
| CN101867528A (en) * | 2010-06-25 | 2010-10-20 | 北京星网锐捷网络技术有限公司 | Multicast service processing method and device |
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