CN101808004A - Method and system for realizing Anycast-RP mechanism - Google Patents
Method and system for realizing Anycast-RP mechanism Download PDFInfo
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- CN101808004A CN101808004A CN201010140592A CN201010140592A CN101808004A CN 101808004 A CN101808004 A CN 101808004A CN 201010140592 A CN201010140592 A CN 201010140592A CN 201010140592 A CN201010140592 A CN 201010140592A CN 101808004 A CN101808004 A CN 101808004A
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Abstract
The invention discloses a method for realizing an Anycast-RP mechanism. The method comprises that a multicast source sends a multicast stream to an SDR; the SDR sends a packaged registration message to an RP; the RP is added with an SPT in the multicast source direction and establishes the SPT from the multicast source to a multicast receiver; the RPT is switched to the SPT and the SDR sends the multicast stream to a UDR by the SPT. The invention also discloses a system for realizing the Anycast-RP mechanism. According to the technical scheme of the invention, the Anycast-RP mechanism is simply realized.
Description
Technical field
The present invention relates to procotol multicast technology in the data communication field, relate in particular to a kind of method and system of realizing Anycast-RP mechanism.
Background technology
Procotol (IP, Internet Protocol) multicasting technology provides the data forwarding mode that a kind of network layer is put multiple spot, in the application that network data transmits, multicast has bandwidth efficiently and once transmits the ability of identical contents to a plurality of receiving stations, has reduced the load of network and server.Up to the present, the IP multicasting technology has been widely used in value-added services such as video request program, IPTV (IPTV, InternetProtocol Television), video conference, long-distance education, network radio station, online game.Because the characteristic of IP multicasting technology itself makes the IP multicasting technology in the IP network field huge development prospect be arranged.
Sparse mode independent multicast agreement (PIM-SM, Protocol Independent Multicast-SparseMode) implication is that multicast path is by not having correlation with the kind that adopts unicast routing protocol, this agreement possesses independence, ease for use, high efficiency and the extensibility of natural agreement, has become at present and the preferred version of IP multicasting technology of future generation.
Convergent point (RP, Rendezvous Point) is notion important among the PIM-SM, it is the router of a kind of RP by name, direct-connected multicast source Designated Router (DR, Designated Router) is responsible for to RP registration information about multicast source, thereby set up RP to the shortest path tree (SPT, Shortest-Path Tree) between the direct-connected multicast source DR.Last DR connects the multicast recipient, is responsible for initiating to add multicast share tree (RPT, Rendezvous Point Tree) to the RP direction, thereby sets up multicast source to the multicast distribution tree between the multicast recipient.Therefore RP becomes the maincenter that connects between multicast source and the multicast recipient, also is the key node that flux of multicast is transmitted among the PIM-SM.Claim that below the DR of direct-connected multicast source is SDR, direct-connected multicast recipient's DR is UDR.
In standard P IM-SM, each multicast group can only be mapped to a unique movable RP, and these characteristics are brought following defective: one, control message and data message all will pass through RP, have not only increased the weight of the burden of RP, have also formed network bottleneck; Two, after movable RP lost efficacy, need carry out the RP election again, initiate registration and adition process again, cause the multicast routing convergence slow; Wherein movable RP is the RP that is finally elected among a plurality of RP; Three, single RP reliability is relatively poor.In order to strengthen the reliability of RP among the PIM-SM, and the flux of multicast in the network is shared, can on backbone network, be chosen some RP operation Anycast-RP mechanism, to reach the purpose of redundancy backup and load balancing.Broadcast convergent point (Anycast-RP arbitrarily, AnycastRendezvous Point) mechanism refers to and chooses certain unicast address as RP address (RPA in pim-sm domain, Rendezvous Point Address), RP information can also can dynamically be issued by PIM-SM by static configuration, and RP information comprises the priority of RP and the RPA of RP; Select a group node as RP in pim-sm domain, this group node is called the Anycast-RP collection, and all members enable the local loopback interface (Loopback) of an address as RPA in the Anycast-RP collection, and are published in the singlecast router system.Each member is called Anycast-RP member in the Anycast-RP collection.Share information about multicast source by certain means between the Anycast-RP member, each Anycast-RP member only bears the maincenter role of its peripheral region.
In the prior art, by between Anycast-RP member, setting up Multicast Source Discovery Protocol (MSDP, Multicast Source Discovery Protocol) peer-to-peer, utilize source activity (SA, Source-Active) message is shared information about multicast source, as shown in Figure 1, Anycast-RP mechanism in PIM-SM workflow and act on as follows:
1, RP1 and RP2 MSDP peer-to-peer each other, and enable identical IP address, as RPA.
2, the Designated Router SDR1 that connects multicast source S1 selects nearer convergent point RP1 registration.
3, Anycast-RP member RP1 is by MSDP another member RP2 notifying multicast source information in the Anycast-RP collection.
4, the Designated Router UDR2 that connects multicast recipient USER2 selects nearer convergent point RP2 to add SPT, and RP2 initiates to add to Designated Router SDR1 direction, creates RPT.
5, create from Designated Router SDR1 to convergent point RP1 again the multicast forwarding path of Designated Router UDR2.
6, the flow process of multicast recipient USER1 receiving group source S2 is with above-mentioned step.
If 7 convergent point RP1 inefficacy or Designated Router SDR1 lost efficacy to the unicast path of RP1, after the convergence of wait singlecast router, SDR1 can reselect RP2 as convergent point; Equally, if after convergent point RP2 inefficacy or Designated Router SDR2 to the unicast path inefficacy of RP2, waited for the singlecast router convergence, SDR2 can reselect RP1 as convergent point, thereby realizes the quick convergence of multicast forwarding path.
In the method for above-mentioned existing techniques in realizing Anycast-RP mechanism, need on all Anycast-RP member node, move MSDP, need safeguard MSDP peer-to-peers a large amount of between the Anycast-RP member node like this; Because the MSDP peer-to-peer links to each other with a plurality of pim-sm domains, thereby find the information about multicast source that other pim-sm domain is interior,, thereby increased the complexity of Anycast-RP mechanism so existence is mutual between pim-sm domain and a plurality of MSDP peer-to-peer.In addition, in the research of next generation network and the planning, IP multicast system has been abandoned MSDP.No matter this shows, be in order to optimize current network, still in order to improve IP multicast routing protocol in the next generation network, all needs to consider how to keep Anycast-RP mechanism under the condition of removing MSDP.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and system of realizing Anycast-RP mechanism, has simply realized Anycast-RP mechanism.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of method that realizes Anycast-RP mechanism, comprising:
Multicast source sends the Designated Router (SDR) of multicast data flow to direct-connected multicast source, and SDR sends to convergent point (RP) with the logon message of encapsulation;
RP adds the shortest path tree (SPT) of multicast source direction, sets up the SPT of multicast source to the multicast recipient;
(RPT) switches to SPT by multicast share tree, and SDR sends to multicast data flow by SPT direct-connected multicast recipient's Designated Router (UDR).
In the said method, this method further comprises:
Broadcast convergent point (Anycast-RP) member last configuration convergent point address (RPA) and convergent point mailing address (RPCA) arbitrarily at each.
In the said method, described on each Anycast-RP member configuration RPA and RPCA be specially:
On each Anycast-RP member, all dispose identical RPA, and on each Anycast-RP member, all dispose a RPCA, all preserve other Anycast-RP members' RPCA on each RP.
In the said method, described multicast source sends multicast data flow to SDR, and SDR sends to RP with the logon message that encapsulates and is specially:
Multicast source sends multicast data flow to SDR, elects a RP according to the priority of candidate RP and the RPA of RP, and by searching the singlecast router that destination address is RPA, SDR sends the logon message that has encapsulated multicast data message to the outgoing interface direction of RP.
In the said method, described RP adds the SPT of multicast source direction, sets up multicast source and is specially to multicast recipient's SPT:
RP adds the SPT of multicast source direction, sends stopped registration messages to SDR, transmits logon message to other all Anycast-RP members; SDR stops to send logon message, and after registration suppresses timer expiry, sends empty logon message to RP; Other Anycast-RP members send stopped registration messages to RP, and add the SPT of multicast source direction.
In the said method, described SDR stops to send logon message, and after registration suppresses timer expiry, also comprises after RP sends empty logon message:
RP sends stopped registration messages to SDR, transmits empty logon message to other all Anycast-RP members; Other RP among the Anycast-RP member send stopped registration messages to the RP that sends empty logon message.
The present invention also provides a kind of system that realizes Anycast-RP mechanism, and this system comprises: SDR, RP, handover module, UDR, wherein,
SDR is used for the multicast data flow that the receiving group source sends, and the logon message of encapsulation is sent to RP; By SPT multicast data flow is sent to UDR;
RP is used to receive the logon message of encapsulation, and adds the SPT of multicast source direction, sets up the SPT of multicast source to the multicast recipient;
Handover module is used for RPT is switched to SPT;
UDR is used to receive the multicast data flow that SDR sends by SPT.
In the said system, this system further comprises:
Configuration module is used for configuration RPA and RPCA on each Anycast-RP member.
The method and system of realization Anycast-RP mechanism provided by the present invention, on the basis of removing MSDP of the prior art, the simple Anycast-RP mechanism that realizes, and the redundancy backup of RP, the load sharing of flux of multicast and the quick convergence of multicast forwarding path, further perfect IP multicast routing protocol and current network in the next generation network.
Description of drawings
Fig. 1 uses the networking schematic diagram for the typical case who realizes Anycast-RP mechanism in the prior art;
Fig. 2 realizes the schematic flow sheet of the method for Anycast-RP mechanism for the present invention;
Fig. 3 registers and adds the schematic flow sheet of method of the SPT of multicast source direction for RP of the present invention;
Fig. 4 realizes the networking schematic diagram of embodiment of the method for Anycast-RP mechanism for the present invention;
Fig. 5 realizes the schematic flow sheet of first embodiment of the method for Anycast-RP mechanism for the present invention;
Fig. 6 realizes the structural representation of the system of Anycast-RP mechanism for the present invention.
Embodiment
The present invention proposes to realize in the pim-sm domain method and system of Anycast-RP mechanism, and basic thought of the present invention is: multicast source sends multicast data flow to SDR, and SDR sends to RP with the logon message of encapsulation; RP adds the SPT of multicast source direction, sets up the SPT of multicast source to the multicast recipient; Switch to SPT by RPT, SDR sends to UDR by SPT with multicast data flow.
Below by drawings and the specific embodiments the present invention is described in further detail again.
Fig. 2 is the schematic flow sheet that the present invention realizes the method for Anycast-RP mechanism, and as shown in Figure 2, this method may further comprise the steps:
Step 201, configuration RPA and RPCA on each Anycast-RP member;
Concrete, all dispose identical RPA on each Anycast-RP member in pim-sm domain, and on each Anycast-RP member, all dispose a convergent point mailing address (RPCA, RendezvousPoint Contact Address), all preserve other Anycast-RP members' RPCA on each RP, like this Anycast-RP member can know each other existence and other Anycast-RP members' RPCA, so just can intercom mutually; In the present embodiment, the equipment of enabling Anycast-RP all is called Anycast-RP member;
Step 202, multicast source send multicast data flow to SDR, and SDR sends to RP with the logon message of encapsulation;
Concrete, multicast source sends multicast data flow to SDR, SDR elects a RP according to the priority of candidate RP and the RPA of RP, usually the RP that selects is the RP nearest apart from SDR, and this distance refers to physical distance, and the address of this RP is RPA, by searching the singlecast router that destination address is RPA, SDR sends the logon message that has encapsulated multicast data message to the outgoing interface direction of RP, and the source address of this logon message is the address of SDR, and destination address is RPA;
Step 203, RP adds the SPT of multicast source direction, sets up the SPT of multicast source to the multicast recipient;
Step 204 switches to SPT by RPT, and SDR sends to UDR by SPT with multicast data flow;
Concrete, in above-mentioned steps, formed the SPT of multicast source to the multicast recipient, therefore multicast data flow just is not optimum forward-path along the forward-path of RP and RPT arrival UDR, RPT need be switched to SPT, formed the shortest path forwarding tree of multicast source to the multicast recipient after switching, SDR sends to UDR by SPT with multicast data flow; Because setting up multicast source behind multicast recipient's SPT, RPT and SPT exist simultaneously, therefore the final jump in the multicast routing table utilizes Protocol Independent Multicast (PIM, Protocol Independent Multicast) cut off RPT, the multicast data flow of originally transmitting in RPT just can automatically switch among the SPT to be transmitted;
Switch to the change that SPT is a unicast path by RPT, only can cause that the processing logic on the RP changes, can not cause that SDR and UDR go up the change of logic.
Fig. 3 is a concrete grammar of realizing step 203 among Fig. 2, is the SPT that RP of the present invention adds the multicast source direction, sets up the schematic flow sheet of multicast source to the method for multicast recipient's SPT, and as shown in Figure 3, this method may further comprise the steps:
Step 301, RP adds the SPT of multicast source direction, sends stopped registration messages to SDR, transmits logon message to other all Anycast-RP members;
Concrete, RP receives this logon message of decapsulation behind the logon message of encapsulation, and the internal layer multicast data message is issued RPT, initiate to add the SPT of multicast source direction, RP adds after the SPT, sends stopped registration messages to SDR, transmits logon message to other all Anycast-RP members;
Step 302, SDR stops to send logon message, and after registration suppresses timer expiry, sends empty logon message to RP; Other Anycast-RP members send stopped registration messages to RP, and add the SPT of multicast source direction;
Concrete, after SDR received stopped registration messages, refresh registration suppressed timer, and stops to send logon message, after registration suppresses timer expiry, sent empty logon message to RP; Other RP among the Anycast-RP member receive from decapsulation logon message behind the logon message of RP, the internal layer multicast data message is issued RPT, initiate to add the SPT of multicast source direction, RP adds after the SPT, sends stopped registration messages to the RP that sends logon message;
Step 303, RP sends stopped registration messages to SDR, transmits empty logon message to other all Anycast-RP members;
Concrete, after RP receives the empty logon message that SDR sends, refresh that (S, G) time-to-live timer time send stopped registration messages to SDR, copy empty logon message, and other RP in Anycast-RP member send the empty logon message of copy; (S, G) multicast routing table of expression multicast group G and multicast source S comprises multicast source address, multicast group address, incoming interface, outgoing interface tabulation, timer etc.; (S, G) the time-to-live timer is used to carry out multicast group routing table update, refreshes at every turn that (S, G) time-to-live timer time just carry out the renewal of multicast group routing table;
After SDR received the stopped registration messages of RP transmission, refresh registration suppressed timer once more, and behind this timer expiry, SDR can continue to send empty logon message to RP;
Step 304, other RP among the Anycast-RP member send stopped registration messages to the RP that sends empty logon message;
Concrete, other RP among the Anycast-RP member send stopped registration messages to the RP that sends empty logon message after receiving empty logon message from RP, refresh (S, G) time-to-live timer time.
Fig. 4 is the networking diagram of the embodiment of the present invention's method of realizing Anycast-RP mechanism, as shown in Figure 4, RP1 and RP2 belong to the RP of indirectly connected source DR, RP3 belongs to the RP of direct-connected source DR, the direct-connected multicast source S1 of SDR1, the direct-connected multicast recipient of UDR1 USER1, SDR1 and UDR1 and RP1 are configured to have nearest clean culture distance relation, the direct-connected multicast recipient of UDR2 USER2, UDR2 and RP2 are configured to have nearest clean culture distance relation, the direct-connected multicast source S3 of RP3, and RP3 is simultaneously as SDR3, at the RP of indirectly connected source DR and the RP of direct-connected source DR, explanation realizes the method for Anycast-RP mechanism respectively below.
Fig. 5 is the schematic flow sheet of first embodiment of the present invention's method of realizing Anycast-RP mechanism, and this embodiment is to be that example describes with RP1 in the DR equipment of indirectly connected source, and as shown in Figure 5, this method may further comprise the steps:
Step 501, configuration RPA and RPCA;
Concrete, the same RPA of configuration on RP1, RP2, RP3, and on RP1, RP2, RP3, dispose RPCA1, RPCA2, RPCA3 respectively, all preserve the RPCA of other RP on each RP, for example RP1 has preserved the RPCA of RP2 and RP3, RP1 just knows the existence of RP2 and RP3 and knows RP2 and the RPCA of RP3 like this, utilizes RPCA, and RP1 can communicate with RP2 and RP3;
Step 502 is set up the RPT of RP to UDR;
Concrete, multicast recipient USER1 sends the request that adds multicast group G to UDR1, clean culture distance relation, the priority of candidate RP and the RPCA of RP according to configuration elect RP1, RP1 is the RP nearest apart from SDR1, UDR1 initiates PIM to the outgoing interface direction of RP1 and adds, hop-by-hop adding mode through PIM arrives RP1, sets up the RPT of RP1 to UDR1; Equally, multicast recipient USER2 at first sends the request that adds multicast group G to UDR2, sets up the RPT of RP2 to UDR2 then;
Step 503, multicast source S1 sends the data of multicast group G to SDR1, and SDR1 sends logon message to RP1;
Concrete, multicast source S1 sends the data of multicast group G to SDR1, and SDR1 sends the PIM logon message that has encapsulated multicast data message to the outgoing interface direction of RP1, and the source address of this logon message is SDR1, and destination address is RPA;
Step 504, the multicast data message that the decapsulation logon message is obtained is transmitted to RPT, adds the SPT of multicast source direction, and RP1 sends stopped registration messages to SDR1; Transmit logon message and give RP2 and RP3;
Concrete, after logon message arrived RP1, because the source address of logon message is not the RPCA of other RP, RP1 judged that this logon message is from SDR, the RP1 deblocking takes on the multicast data message in the logon message and is forwarded to the RPT that has set up, and initiates to add the SPT of multicast source S1 direction; RP1 sends stopped registration messages to SDR1, continues execution in step 509 then; Because RP1 has preserved the RPCA of other RP, RP1 transmits this logon message to RP2 and RP3 after duplicating logon message, the source address of the logon message that is forwarded is RPCA1, destination address is RPCA2 and RPCA3, RP2 receives logon message with regard to execution in step 505, and RP3 receives that logon message is with regard to execution in step 506;
Step 505, decapsulation logon message obtain multicast data message and are transmitted to RPT, add the SPT of multicast source direction;
Concrete, after logon message arrives RP2, because the source address of this logon message is the RPCA of RP1, so RP2 judges that this message is from RP1, the RP2 deblocking takes on the multicast data message in the logon message and is transmitted to the RPT that has set up, and send stopped registration messages to RP1, initiate to add the SPT of multicast source S1 direction;
Step 506, RP3 creates routing table, abandons logon message, and sends stopped registration messages to RP1;
Concrete, logon message is not set up RPT after arriving RP3 on the RP3 in step 502, (S, G) routing table are prepared against the SPT that the RP that receives message adds multicast source S1 direction fast so RP3 only creates, RP3 abandons logon message, and sends stopped registration messages to RP1;
Step 507, RP1 abandons stopped registration messages;
Concrete, after RP1 receives the stopped registration messages of RP2 and RP3 transmission, because RP1 is not direct-connected source device, do not possess the login state of maintenance machine, so RP1 abandons stopped registration messages;
Step 508 switches to SPT by RPT, and the data of multicast group G arrive UDR by SPT;
Concrete, in above-mentioned steps, formed the SPT of multicast source S1 to multicast recipient UDR1, therefore RPT is not optimum forward-path, RPT need be switched to SPT, formed the shortest path forwarding tree of multicast source to the multicast recipient after switching, SDR sends to UDR by SPT with the data of multicast group G;
Step 509 after SDR1 receives stopped registration messages, stops to send logon message;
Concrete, after SDR1 receives the stopped registration messages of RP1 transmission, can refresh registration suppress timer, stop to send logon message, behind this timer expiry, SDR1 can send empty logon message to RP1;
Step 510 after RP1 receives the empty logon message of SDR1, sends stopped registration messages to SDR1, transmits empty logon message and gives RP2 and RP3;
Concrete, after RP1 receives the empty logon message of SDR1, refresh the time-to-live timer of relevant multicast route forwarding table, and send stopped registration messages to SDR1, transmit this sky logon message to RP2 and RP3; After SDR1 received the stopped registration messages of RP1 transmission, refresh registration suppressed timer once more, and behind this timer expiry, SDR1 can continue to send empty logon message to RP1;
Step 511, RP2 and RP3 refresh the time-to-live timer, send stopped registration messages to RP1;
Concrete, after RP2 and RP3 receive empty logon message from RP1, refresh the time-to-live timer of relevant multicast route forwarding table, and send stopped registration messages to RP1.
With RP3 is the direct-connected source DR of representative, different with the RP1 processing method only is, the data that send multicast group G as multicast source S3 are during to SDR3, because SDR3 is identical with the RP3 position, so SDR3 directly sends the logon message that has encapsulated multicast data message to RP1 and RP2, does not need to transmit by RP3.
The present invention also provides a kind of system that realizes Anycast-RP mechanism, and Fig. 6 is the structural representation that the present invention realizes the system of Anycast-RP mechanism, and as shown in Figure 6, this system comprises: SDR 31, RP 32, handover module 33, UDR34; Wherein,
This system further comprises:
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a method that realizes Anycast-RP mechanism is characterized in that, this method comprises:
Multicast source sends the Designated Router (SDR) of multicast data flow to direct-connected multicast source, and SDR sends to convergent point (RP) with the logon message of encapsulation;
RP adds the shortest path tree (SPT) of multicast source direction, sets up the SPT of multicast source to the multicast recipient;
(RPT) switches to SPT by multicast share tree, and SDR sends to multicast data flow by SPT direct-connected multicast recipient's Designated Router (UDR).
2. method according to claim 1 is characterized in that, this method further comprises:
Broadcast convergent point (Anycast-RP) member last configuration convergent point address (RPA) and convergent point mailing address (RPCA) arbitrarily at each.
3. method according to claim 2 is characterized in that, described on each Anycast-RP member configuration RPA and RPCA be specially:
On each Anycast-RP member, all dispose identical RPA, and on each Anycast-RP member, all dispose a RPCA, all preserve other Anycast-RP members' RPCA on each RP.
4. method according to claim 1 is characterized in that, described multicast source sends multicast data flow to SDR, and SDR sends to RP with the logon message that encapsulates and is specially:
Multicast source sends multicast data flow to SDR, elects a RP according to the priority of candidate RP and the RPA of RP, and by searching the singlecast router that destination address is RPA, SDR sends the logon message that has encapsulated multicast data message to the outgoing interface direction of RP.
5. according to the arbitrary described method of claim 1 to 4, it is characterized in that described RP adds the SPT of multicast source direction, set up multicast source and be specially to multicast recipient's SPT:
RP adds the SPT of multicast source direction, sends stopped registration messages to SDR, transmits logon message to other all Anycast-RP members; SDR stops to send logon message, and after registration suppresses timer expiry, sends empty logon message to RP; Other Anycast-RP members send stopped registration messages to RP, and add the SPT of multicast source direction.
6. method according to claim 5 is characterized in that described SDR stops to send logon message, and after registration suppresses timer expiry, also comprises after RP sends empty logon message:
RP sends stopped registration messages to SDR, transmits empty logon message to other all Anycast-RP members; Other RP among the Anycast-RP member send stopped registration messages to the RP that sends empty logon message.
7. a system that realizes Anycast-RP mechanism is characterized in that, this system comprises: SDR, RP, handover module, UDR, wherein,
SDR is used for the multicast data flow that the receiving group source sends, and the logon message of encapsulation is sent to RP; By SPT multicast data flow is sent to UDR;
RP is used to receive the logon message of encapsulation, and adds the SPT of multicast source direction, sets up the SPT of multicast source to the multicast recipient;
Handover module is used for RPT is switched to SPT;
UDR is used to receive the multicast data flow that SDR sends by SPT.
8. system according to claim 7 is characterized in that, this system further comprises:
Configuration module is used for configuration RPA and RPCA on each Anycast-RP member.
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| CN107547350A (en) * | 2017-08-02 | 2018-01-05 | 新华三技术有限公司 | flow processing method and device |
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