CN101232392A - Method for notifying multicast source between MSDP and PIM - Google Patents
Method for notifying multicast source between MSDP and PIM Download PDFInfo
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Abstract
The invention discloses a method for notifying multicast source between PIM and MSDP boundary routers with flexible and simple networking application. A cross-domain multicast is implemented by adopting the method and when RP and MSDP are disposed in different devices, the RP and the MSDP can be notified of current active information with each other. The method comprises that the PIM notifies multicast source to the MSDP, and the MSDP notifies multicast source to the PIM. The PIM wherein notifies multicast source to the MSDP by a method that the MSDP transmits an active source inquire to an RP; and if effective multicast source exists in local area, the RP constitutes an inquire response message containing information of the multicast source and replies the message to the MSDP. The MSDP notifies multicast source to the PIM by a method that the MSDP transmits an active source registration message to an RP in the same domain according to new active source message in active source buffer; and if corresponding multicast is added on the RP in the domain and no corresponding multicast source/multicast source pair exists, and a PIM (S, G) additional message is transmitted to the active source.
Description
Technical field
The invention belongs to cross-domain technical field of multicast, relate in particular to the method for notifying multicast source between a kind of MSDP and PIM.
Background technology
At present, PIM SM (protocol-independent-sparse mode) remains the recognised standard of multicast in the territory, along with carrying out of multicast service, also will there be more user the IP multicast services need be expanded to the network boundary of crossing over ISP, for realization multicast between fields service that can be successful, in networking mode commonly used, often adopt PIM-SM/MBGP (multiprotocol bgp)/MSDP (Multicast Source Discovery Protocol: the solution of combination Multicast SourceDiscovery Protocol), like this at the whole network operation PIM-SM, propagate the information of multicast topology between the territory by MBGP, propagate information about multicast source by MSDP.
When having a plurality of pim-sm domain in the network, the MSDP edge router can be so that the RP in each pim-sm domain (convergent point) can shared activity source information, and local activity source information is passed to the RP of far-end, RP in remote domain recognizes the information of active source, they just can transmit the information to the recipient in this territory, like this, multicast packet just can have been transmitted between the territory.
In the multicast networking, ISP can be according to the size of multicast network, requirements such as fail safe come flexible configuration RP and MSDP edge router, when RP is configured on the identical equipment with the MSDP edge router, and when using identical IP address, login mechanism by PIM-SM, the MSDP edge router can be known the active source that current RP is all, RP also can be known the source information that the MSDP edge router obtains from other multicast domain, but when RP is configured on the different equipment with the MSDP edge router, just need an approach, make MSDP edge router and RP can know current each other active source information each other.
Realizing cross-domain multicast, and RP is with on MSDP is deployed in different equipment the time, existing solution all is that the edge router that will dispose the MSDP session also is chosen for the RP point, between them, move Anycast RP (appoint and broadcast RP) then, its mechanism is summarised as: identical Anycast RP address of a plurality of RP configuration, afterwards RP use this interface externally issue organize the map information of RP.Between these RP, re-use different separately addresses and set up MSDP and connect, utilize MSDP realize information source information between all RP synchronously.Its essence all is RP and MSDP need be deployed in identical device, and underaction is used in networking, has increased the networking complexity simultaneously.
Summary of the invention
The technical problem to be solved in the present invention provides the method for notifying multicast source between easy PIM of a kind of networking applying flexible and MSDP edge router, adopt this method realizing cross-domain multicast, and RP can make and know current each other active source information between MSDP and the RP effectively with on MSDP is deployed in different equipment the time.
For solving the problems of the technologies described above, between PIM of the present invention and MSDP the method for notifying multicast source comprise PIM to MSDP notifying multicast source and MSDP to the PIM notifying multicast source, wherein PIM to the method for MSDP notifying multicast source is: the MSDP edge router sends the active source inquiry to the RP in autonomous territory, its place, if there is effective multicast source in this locality, then the RP structure comprises the inquiry request response message message of this information about multicast source and it is replied to MSDP; MSDP to the method for PIM notifying multicast source is: MSDP in according to the active source buffer memory new active source message send the active source logon message to the RP of its same area, if there is corresponding multicast group to add on the RP of this territory, and do not exist corresponding multicast source/multicast group right, (S G) joins message then to send PIM to the source.
Described PIM specifically may further comprise the steps to the MSDP notifying multicast source:
Step 101, MSDP edge router periodically send the active source inquiry to the RP in autonomous territory, its place;
Step 102, RP carry out rpf check to the query message of receiving, check failure, then finish the processing of this polling cycle; Rpf check is passed through, and then forwards step 103 to;
Step 103, RP are checked whether effective multicast source of this locality, if do not have, then abandon this message packet, finish the processing of this polling cycle; Then execution in step 104 is arranged;
Step 104, RP construct corresponding inquiry request response message message and it are replied to the MSDP edge router, and this inquiry request response message message comprises the described effective multicast source message of step 103;
Step 105, MSDP edge router carry out rpf check to the inquiry response message of receiving, check failure, and packet loss finishes the processing of this polling cycle; Then execution in step 106 is passed through in rpf check;
The described multicast source message that step 106, MSDP edge router comprise the inquiry response message of receiving is notified the MSDP partner of far-end.The described MSDP of this step is adopted the active source information announcement to far-end MSDP partner massage pattern is a MSDP SA pattern.
Described MSDP specifically may further comprise the steps to the PIM notifying multicast source:
Step 201, when the active source information of the MSDP partner announcement of receiving other autonomous territory, the MSDP edge router checks whether this territory active source buffer memory produces new effective active source, does not stop at the operation of this active source information if having then; If produce then execution in step 202 of new effective active source;
Step 202, MSDP send the active source logon message according to active source message cycle new in the active source buffer memory to the RP of its same area;
Step 203, RP carry out rpf check to the active source logon message of receiving, if check failure, then finish the processing in this cycle; If rpf check is passed through, then forward step 204 to;
Step 204, RP resolve this logon message;
Step 205, RP check whether this territory has corresponding multicast group to add, and do not exist corresponding multicast source/multicast group right, are execution in step 206 then, otherwise execution in step 207;
Step 206, (S G) joins message to send PIM to the source;
Step 207, RP send out registration to the MSDP of same area edge router and stop message;
Step 208, MSDP stop message to the registration of receiving and carry out rpf check, check failure, then finish the processing in this cycle; Rpf check is by then stopping forwarding step 202 described active source logon messages
The present invention relates to 5 kinds of type of messages, be respectively: active source inquiry (Active Source Query), active source are replied (Active Source Reply), active source registration (Active Source Register), the active source registration stops (Active Source Register stop), active source message (Active SourceMessage).
Adopt the method for notifying multicast source between two kinds of RP provided by the invention and MSDP edge router, because the relatively independent execution of RP and MSDP by the interaction flow between them, is announced the not active source of same area simultaneously the role of network; Cross-domain like this multicast can be according to actual networking when selecting RP point and MSDP edge router, and flexible configuration and unified plan need not be subjected to too many constraints.
Description of drawings
Fig. 1 is that RP of the present invention is to MSDP edge router announcement active source information schematic diagram;
Fig. 2 is that MSDP edge router of the present invention is to RP announcement active source information schematic diagram;
Fig. 3 is the interaction flow schematic diagram of RP and MSDP edge router.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
Between PIM of the present invention and MSDP the method for notifying multicast source comprise PIM to MSDP notifying multicast source and MSDP to two parallel aspects of PIM notifying multicast source, when realizing cross-domain multicast, make between MSDP and the RP and can effectively know current each other active source information, and on making RP and MSDP can being deployed in different equipment.Figure 1 shows that the schematic diagram of PIM, Figure 2 shows that the schematic diagram of MSDP to the PIM notifying multicast source to the MSDP notifying multicast source.The present invention relates to 5 kinds of type of messages: active source inquiry (Active SourceQuery), active source are replied (Active Source Reply), active source registration (Active SourceRegister), the active source registration stops (Active Source Register stop), active source message (Active Source Message).
Because in the methods of the invention, PIM is two parallel aspects to MSDP notifying multicast source and MSDP to the PIM notifying multicast source, is therefore adopting the inventive method to carry out in the autonomous territory of cross-domain multicast, and the processing procedure of RP is as follows:
Step 301, RP receive the unicast messages that the MSDP edge router sends, and distinguish information type, if the active source registration message then forwards step 302 to; If query messages then forwards step 312 to;
Step 302, processing messages are carried out rpf check to the active source logon message of receiving; Check failure, finish the processing of this registration period; Rpf check is passed through, and forwards step 303 to;
Step 303, parsing message packet;
Step 04, RP check whether this territory has corresponding multicast group to add, and do not exist corresponding multicast source/multicast group right, are then to forward step 305 to; Otherwise forward step 306 to;
Step 305, forward PIM SM handling process to, (S G) joins message to send PIM to the source;
Step 306, send out registration to the MSDP edge router and stop message;
Step 312, the query message of receiving is carried out rpf check, check failure, then finish the processing of this polling cycle; Rpf check is passed through, and forwards step 313 to;
Step 313, check whether effective multicast source of this locality,, finish the processing of this polling cycle if do not have; Then execution in step 314 is arranged;
Step 314, the corresponding inquiry request response message message of structure, this inquiry request response message comprises the described effective multicast source message of step 313;
Step 315, reply inquiry request response message to the MSDP edge router.
Adopting the inventive method to carry out in the autonomous territory of cross-domain multicast, the processing procedure of MSDP edge router is as follows:
Step 401, MSDP edge router check whether receive message packet, if execution in step 402 then;
Step 402, differentiation type of message are to register when stopping message if receive type of message, forward step 411 to; If during active source message, forward step 421 to; If when looking into the news response message, forward step 431 to;
Step 411, the registration of receiving is stopped message carrying out rpf check, check failure, finish the processing of this registration period; Then execution in step 412 is passed through in rpf check;
Step 412, the Login of stopping action, flow process finishes.
Whether step 421, the local SA-Cache of inspection exist effective active source, then do not finish the processing of polling cycle; Then execution in step 422 is arranged;
Step 422, send the active source registration message to local RP according to SA-Cache property information cycle;
Step 431, the inquiry response message of receiving is carried out rpf check, check failure, packet loss finishes the processing of this polling cycle; Then execution in step 432 is passed through in rpf check;
Effective multicast source during step 432, processing are replied, notice MSDP session is constructed the MSDP partner that MSDP SA message sends to far-end according to response message.
Provide one below in two autonomous territories, RP all is deployed on the different equipment with the MSDP edge router, and the embodiment of the inventive method is all adopted in these two autonomous territories:
Fig. 3 is the interaction flow schematic diagram of RP and MSDP edge router, and network 1 is the networking of ISP1, and ISP1 the whole network is disposed PIM SM, configuration AA1 is ISP1 multicast domain RP, carry out the RP handling process, configuration AA2 is this territory MSDP edge router, carries out MSDP edge router handling process.
Network 2 is networkings of ISP2, and ISP2 the whole network is disposed PIM SM, and configuration BB1 is ISP2 multicast domain RP, carries out the RP handling process, and configuration BB2 is this territory MSDP edge router, carries out MSDP edge router handling process.
ISP1AA2 and ISP2BB2 set up MSDP session and MBGP session.
As ISP1 and ISP2 during without any active source, ISP1AA2 and ISP2BB2 all periodically send the active source inquiry to the RP in this autonomous territory, after RP receives query messages, check that local multicast source/multicast group is right, do not have effective multicast source, then abandon this message packet; If multicast server S1 of ISP1 this moment, begin to send to the multicast message of G1, multicast source login mechanism according to PIM SM, RP knows that at this moment effective source/group of existence is to (S1, G1), ISP1AA1 is tectonic activity source response message immediately, clean culture sends to ISP1AA2, ISP1AA2 carries out rpf check to this message packet, and inspection is passed through, then with the (S1 that carries in the message, G1) pass to the MSDP partner ISP2BB2 of far-end by MSDP SA message, ISP2BB2 receives SA message, after analytic message and rpf check, with the source/group of carrying in the SA message to writing local SA-Cache, send the active source registration message simultaneously to this territory RP:ISP2BB1, ISP2BB1 receives the active source registration message, if there is this moment the multicast group that needs to receive the G1 flow to add, then according to PIM SM, send PIM (S to source S1, G) add message, the structure multicast transmit tree is sent out the active source registration to ISP2BB2 simultaneously and is stopped message.So far, finish can different autonomous territories between the structure of active tree, realized the cross-domain forwarding of multicast data flow.
All adopt among the embodiment of the inventive method in above-mentioned two autonomous territories, information about multicast source is communicated to another territory from the RP in a territory the process of RP is as follows:
Step 1, MSDP edge router periodically send the active source inquiry to the RP in autonomous territory, its place;
Step 2, RP carry out rpf check to the query message of receiving, check failure, then finish the processing of this polling cycle; Rpf check is passed through, and then forwards step 3 to;
Step 3, RP are checked whether effective multicast source of this locality, if do not have, then abandon this message packet, finish the processing of this polling cycle; Then execution in step 4 is arranged;
Step 4, RP construct corresponding inquiry request response message message and it are replied to the MSDP edge router, and this inquiry request response message message comprises the described effective multicast source message of step 3;
Step 5, MSDP edge router carry out rpf check to the inquiry response message of receiving, check failure, and packet loss finishes the processing of this polling cycle; Then execution in step 6 is passed through in rpf check;
The described multicast source message that step 6, MSDP edge router comprise the inquiry response message of receiving is notified the MSDP partner of far-end;
The MSDP of step 7, the described remote domain of step 6 checks whether the active source buffer memory in this territory produces new effective multicast source, if then do not finish the processing of this polling cycle; Then execution in step 8 is arranged;
The MSDP of step 8, described remote domain periodically sends the active source logon message to the RP of its same area according to the described new effective multicast source of step 7;
The RP of step 9, described remote domain carries out rpf check to the active source logon message of receiving, if check failure, then finishes the processing of this registration period, and this cycle is the described cycle of step 8; If rpf check is passed through, then execution in step 10;
The RP of step 10, described remote domain resolves this logon message;
The RP of step 11, described remote domain checks whether existing corresponding group membership adds in its this territory, and does not exist corresponding multicast source/multicast group right, is then to forward step 12 to; Otherwise forward step 13 to;
Step 12, (S G) joins message to send PIM to the source;
The RP of step 13, described remote domain sends out registration to the MSDP of same area edge router and stops message;
Step 14, MSDP stop message to the registration of receiving and carry out rpf check, check failure, then finish the processing of this registration period, and this cycle is the described cycle of step 8; Rpf check is by then stopping forwarding step 8 described active source logon messages.
Comprehensively above-mentioned, in same autonomous territory, when the RP that disposes with the MSDP edge router not on identical equipment the time, by the interaction flow of RP and MSDP edge router and the flow process of dealing with separately, between them, can announce effective information about multicast source easily, effectively carry out the forwarding of cross-domain flux of multicast.
Above-described specific embodiment, purpose of the present invention, technical scheme and beneficial effect are further described, institute it should be noted, the above only is specific embodiments of the invention, and those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of the technical scheme of claim record of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (4)
1. the method for notifying multicast source between PIM and MSDP, comprise PIM to MSDP notifying multicast source and MSDP to the PIM notifying multicast source, it is characterized in that:
Described PIM to the method for MSDP notifying multicast source is: the MSDP edge router sends the active source inquiry to the RP in autonomous territory, its place, if there is effective multicast source in this locality, then the RP structure comprises the inquiry request response message message of this information about multicast source and it is replied to MSDP;
Described MSDP to the method for PIM notifying multicast source is: MSDP in according to the active source buffer memory new active source message send the active source logon message to the RP of its same area, if there is corresponding multicast group to add on the RP of this territory, and do not exist corresponding multicast source/multicast group right, (S G) joins message then to send PIM to the source.
2. the method for notifying multicast source between PIM according to claim 1 and MSDP is characterized in that described PIM specifically may further comprise the steps to the MSDP notifying multicast source:
Step 101, MSDP edge router periodically send the active source inquiry to the RP in autonomous territory, its place;
Step 102, RP carry out rpf check to the query message of receiving, check failure, then finish the processing of this polling cycle; Rpf check is passed through, and then forwards step 103 to;
Step 103, RP are checked whether effective multicast source of this locality, if do not have, then abandon this message packet, finish the processing of this polling cycle; Then execution in step 104 is arranged;
Step 104, RP construct corresponding inquiry request response message message and it are replied to the MSDP edge router, and this inquiry request response message message comprises the described effective multicast source message of step 103;
Step 105, MSDP edge router carry out rpf check to the inquiry response message of receiving, check failure, and packet loss finishes the processing of this polling cycle; Then execution in step 106 is passed through in rpf check;
The described multicast source message that step 106, MSDP edge router comprise the inquiry response message of receiving is notified the MSDP partner of far-end.
3. the method for notifying multicast source between PIM according to claim 2 and MSDP is characterized in that: the described MSDP of step 106 is the MSDPSA pattern with the active source information announcement to the massage pattern that far-end MSDP partner is adopted.
4. according to the method for notifying multicast source between claim 1,2 or 3 described PIM and MSDP, it is characterized in that described MSDP specifically may further comprise the steps to the PIM notifying multicast source:
Step 201, when the active source information of the MSDP partner announcement of receiving other autonomous territory, the MSDP edge router checks whether this territory active source buffer memory produces new effective active source, does not stop at the operation of this active source information if having then; If produce then execution in step 202 of new effective active source;
Step 202, MSDP send the active source logon message according to active source message cycle new in the active source buffer memory to the RP of its same area;
Step 203, RP carry out rpf check to the active source logon message of receiving, if check failure, then finish the processing in this cycle; If rpf check is passed through, then forward step 204 to;
Step 204, RP resolve this logon message;
Step 205, RP check whether this territory has corresponding multicast group to add, and do not exist corresponding multicast source/multicast group right, are execution in step 206 then, otherwise execution in step 207;
Step 206, (S G) joins message to send PIM to the source;
Step 207, RP send out registration to the MSDP of same area edge router and stop message;
Step 208, MSDP stop message to the registration of receiving and carry out rpf check, check failure, then finish the processing in this cycle; Rpf check is by then stopping forwarding step 202 described active source logon messages.
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