CN101222414A - Device, system and method for implementing multicast communication - Google Patents
Device, system and method for implementing multicast communication Download PDFInfo
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Abstract
The embodiment of the invention provides a device for realizing the multicast communication, a system and a method. The device comprises an identity resolving server; the system comprises an SM, an access route, a receiver and an identity resolving server; the method mainly comprises the following steps that: the SM obtains and stores all mapping relation information between EID of all nodes and IP addresses; according to the EID information of all the nodes, a multicast tree is established and controlled; the multicast communication between the SM and the receiver is realized by the transfer of the access route according to the multicast tree and the IP address information of the nodes. The invention ensures that an intermediate node in the network takes charge of transmitting the multicast communication message without storing the state information of an application layer multicast tree or maintaining the application layer multicast tree, thereby effectively reducing the burden of a middle layer.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of device, system and method for realizing cast communication.
Background technology
Multicast is a kind of technology of using network bandwidth resources of optimizing.Adopt multicasting technology can allow data flow to send to a plurality of destinations from one or more data sources.Can avoid unnecessary data cladding system, help reducing the backbone network flow, thereby more effectively utilize Internet resources.
At present, multicast mainly is divided into IP multicast and application layer multicast (being also referred to as the overlay multicast) two big classes.In traditional IP multicast model, adopt igmpinternet to carry out alternately between multicast recipient and the multicast router, igmpinternet comprises: IGMP (at the igmpinternet of IPv4) and MLD (at the igmpinternet of IPv6).Then adopt multicast routing protocol to set up, upgrade and safeguard multicast tree between the router, router draws the path of duplicating and distributing multicast message according to this multicast tree.The collected database of igmpinternet is used for judging whether have the multicast recipient on local subnet by multicast routing protocol, guarantees that the multicast recipient receives the multicast message that it is asked.
At present, the IP multicast service model mainly comprises two kinds: ASM (Any-Source Multicast) model and SSM (specific source multicasting) model.The IP multicast has the network utilization height, can save the advantage of sender's its other resources, is suitable for real-time, insecure application.But also there is following problem in the IP multicast:
1, router is necessary for each multicast group preservation state, and autgmentability is poor;
2, require all-router all to support multicast routing protocol, be unfavorable for promoting the use of;
3, adapt to all application with unified model, the algorithm design difficulty;
4, the expense to management such as multicast group add, withdraws from is big.
The basic characteristics of application layer multicast are the forwarding models that keeps original simple, unreliable, the clean culture in the Internet, realize the multicast forwarding function by end system.The application layer multicast Technology Need is based on following prerequisite:
1, the bandwidth of network is relative abundant with the forwarding resource, and wherein the disposal ability of server is main bottleneck;
2, multicast member can provide resource to be used for transmitting;
3, application is not harsh to performance demands, tolerable message dropping and bigger time delay.
In the application layer multicast technology, the member of multicast group interconnects by the mode of setting up the overlay multicast tree.All multicast functionalitys are all realized on terminal as functions such as group membership management, packet duplicate.The application layer multicast agreement has been constructed two topologys between them when each group membership is organized together: control topological sum data topology.Wherein data topology is a multicast distribution tree, and it has defined the path that data are distributed between the group membership; The control topology then is a network structure, and its purpose is to increase connectedness and the robustness between the group membership.
Application layer multicast has following advantage: only need to change end system, be convenient to realize and promote; Be convenient to be optimized at application-specific.But because application layer multicast is not considered the route and the data forwarding of IP layer, therefore, its efficient is lower than IP multicast, and performances such as delay, forwarding rate are lower than IP multicast.At present, application layer multicast is mainly used in real-time multimedia transmission, as the dissemination system (as video broadcasting) and the subscription/dissemination system of video conferencing system, Media Stream.
In recent years, along with the development of wireless technology, increasing people is connected on the Internet by wireless device, supports to be moved into the inevitable requirement for internet development.Move and the combination of multicast will further enlarge and moves and the range of application of multicast, for both application provides development space more widely.But combination mobile and multicast has brought new challenge to the both.In mobile environment, multicast not only needs to manage dynamic multicast group membership, foundation and safeguards multicast tree, also needs to solve the problem that group membership's position dynamic changes.But the multicast protocol that uses in the Internet supposes all that usually its group membership is static now, and does not consider the situation that group membership's position dynamic changes.If after move each group membership position, all be used as an initiate group membership, bring too much expense then can for the management and the maintenance of multicast tree of multicast group, increase the burden of network; In addition, moving of group membership also can cause phenomenons such as handover delay, packet loss, can not satisfy real-time multimedia and use.
Traditional ICP/IP protocol is mainly used in the communication between the stationary nodes.In traditional internet architecture based on the ICP/IP protocol stack, the IP address is both as the identify label of main frame, also as the station location marker of main frame, when the IP of main frame address change, the original transmission of setting up of this main frame connects and will be interrupted, need rebulid connection, be unfavorable for supporting the mobility of main frame.
At present, many schemes are arranged,, traditional ICP/IP protocol is redesigned, so that make the Internet support mobility as HIP (hostid agreement) etc.HIP has proposed a kind of mechanism of separating with the position based on identity, the dual-use function of Traditional IP address is separated an IP address station location marker as main frame; Introduce a new name space simultaneously: the end hostid, the use side hostid is as the identify label of main frame.The mechanism that this identity is separated with the position, even make IP addresses of nodes change, the connection of transport layer can not interrupted yet, and does not need to rebulid connection.
A kind of application layer multicast scheme is in the prior art: Bayeux application layer multicast technical scheme.This scheme is based on the Tapestry routing mechanism.Each node all has a globally unique identifier ID in the network, and this ID is independent of the position of node and the location independent of node.Each node all must be safeguarded a neighbor entry in the network, and in this neighbor entry, the ID of neighbor node and the ID of this node have the identical bits of some.When carrying out the forwarding of packet, the ID of n hop node has at least the n position identical with the ID of destination node.When certain intermediate node carries out the packet forwarding, if the ID of the ID of this intermediate node and destination node has the n position identical, then this intermediate node is inquired about the neighbor entry of oneself, check whether to have the identical node in n+1 position is arranged with the ID of destination node, if have, then intermediate node is transmitted to this next-hop node to the next-hop node of the node that finds as oneself to packet simultaneously.
In this scheme, used special logical construction multicast node is shone upon or to address.Each multicast conversation is by＜session name, UID〉common expression, wherein the session name WD content of this multicast, UID represents a particular example of this session.When setting up the overlay multicast tree, multicast source is oneself to be root node, and each intermediate node is set up according to the content in the own neighbor entry and transmitted accordingly, finally forms the whole network overlay multicast tree.A simple Bayeux overlay multicast is set schematic diagram as shown in Figure 1, the ID of this node of digitized representation of intranodal among Fig. 1.
In Bayeux overlay multicast tree shown in Figure 1, if recipient 3360 wishes to insert 7876 multicast group, then 3360 transmissions add message to 7876, and the path of this message process is x360, xx60, xxx0,7876.After multicast source 7876 receives this adding message, give recipient's 3360 echo reply message.Multicast source, recipient 3360, this response message the intermediate node of process made up an overlay multicast tree jointly.Because the asymmetry of Tapestry routing mechanism, the recipient send join message the path of process and the path in the final overlay multicast tree that forms might not equate.
Bayeux application layer multicast technology is on the basis of Tapestry routing mechanism, the state information of overlay multicast tree is kept on the intermediate node, utilize the Tapestry routing mechanism that message is forwarded, make multicast forwarding can use simple rule to realize, thereby reduced the state-maintenance expense and transmitted expense, avoided the use of Routing Protocol.
The shortcoming of the application layer multicast scheme of above-mentioned prior art is:
1: in this scheme, the relation of internodal relation in can not corresponding real network in the logical space, the relation of internodal relation in can not corresponding real network in the multicast tree just, therefore the message forwarding path that obtains from multicast tree might not be a shortest path, makes message forwarding have bigger delay.
2: in this scheme, intermediate node need be preserved the state information of application layer multicast tree, and the application layer multicast tree is safeguarded, therefore, has increased the weight of the burden of intermediate node.
Summary of the invention
The purpose of the embodiment of the invention provides a kind of device, system and method for realizing cast communication, thereby can make the intermediate node in the network not need to preserve the state information that application layer multicast is set, do not need the application layer multicast tree is safeguarded, only be responsible for carrying out the forwarding of multicast data message, thereby alleviate the burden in intermediate layer effectively.
The purpose of the embodiment of the invention is achieved through the following technical solutions:
A kind of identity resolution server comprises:
Mapping relations are preserved module: be used to preserve the end hostid EID and the IP address of all nodes and multicast source, and the mapping relations information between EID and the IP address;
The mapping relations administration module: be used for mapping relations are preserved described EID and the IP address that module is preserved, and the mapping relations information between EID and the IP address increase, upgrade and delete at least one operation;
Mapping relations parsing module: be used for the analysis request of carrying EID information according to the node transmission, the query mappings relation is preserved the described mapping relations information of preserving in the module, obtain the IP address information of the EID correspondence of carrying in the described analysis request, this IP address information is returned to described node.
A kind of system that realizes cast communication comprises:
Multicast source: be used to obtain and preserve the EID of all nodes and the mapping relations information between the IP address; Make up and the managing multicast tree according to the EID information of all nodes, according to this multicast tree and IP addresses of nodes information by couple in router transfer and node between carry out cast communication;
Couple in router: use that Open Shortest Path First ospf protocol is carried out the transmission of multicast data message between multicast source and recipient;
Recipient: send the multicast message that joins request to multicast source, add corresponding multicast group; Carry out cast communication between transfer by couple in router and the multicast source.
A kind of method that realizes cast communication comprises:
Multicast source obtains and preserves the EID of all nodes and the mapping relations information between the IP address; Make up with managing multicast according to the EID information of all nodes and to set;
Described multicast source is according to the transfer by couple in router of described multicast tree and IP addresses of nodes information, and carries out cast communication between the recipient.
The technical scheme that provides by the invention described above embodiment as can be seen, the embodiment of the invention is represented the station location marker of node by the identify label with EID (end hostid) expression node with the IP address; Be provided with that IRS (identity resolution server) preserves, parsing and the EID of management node and the mapping relations between the IP address.Compare with prior art, have following advantage:
1, the intermediate node in the network does not need to preserve the state information of application layer multicast tree, does not need the application layer multicast tree is safeguarded yet, just is responsible for carrying out the forwarding of multicast data message, therefore, has alleviated the burden of intermediate node.
2, at the IP layer, the router in the network uses OSPF (shortest path priority route protocol) to carry out the forwarding of routing and multicast data message according to the IP address of source node and destination node, makes that the forward-path of multicast data message is a shortest path.
3, multicast source is set up multicast tree according to the identity information of node, when multicast source or recipient are moved, does not need to change the topological relation of multicast tree, makes stationary nodes and mobile node all carry out cast communication with a kind of uniform way.
Description of drawings
Fig. 1 is a simple Bayeux overlay multicast tree schematic diagram;
Fig. 2 is the structural representation of the described IRS of the embodiment of the invention;
Fig. 3 is the form schematic diagram of the information of the described IRS preservation of the embodiment of the invention;
Fig. 4 is the form schematic diagram that the embodiment of the invention described identity analysis request message and identity are resolved response message;
Fig. 5 is the structural representation of the system of the described realization cast communication of the embodiment of the invention;
Fig. 6 is the particular flow sheet of the method for the described realization cast communication of the embodiment of the invention;
Fig. 7 is the join request form schematic diagram of message of the described multicast of the embodiment of the invention;
Fig. 8 is the form schematic diagram of the resource record of preservation in the described multicast member tabulation of the embodiment of the invention;
Fig. 9 is described after the recipient is moved for the embodiment of the invention, the process chart that multicast tree is safeguarded;
Figure 10 is the form schematic diagram that message is upgraded in the described address of the embodiment of the invention;
Figure 11 is described after multicast source is moved for the embodiment of the invention, the process chart that multicast tree is safeguarded.
Embodiment
The embodiment of the invention provides a kind of device, system and method for realizing cast communication, and this method has been introduced the notion of EID, represents the identify label of node with EID, represents the station location marker of node with the IP address.Be provided with that IRS preserves, parsing and the EID of management node and the mapping relations between the IP address; Multicast source is set up multicast tree according to the identity information of node.
The embodiment of the invention is represented the identify label of node with EID, and each node all has globally unique EID, represents the station location marker of node with the IP address.The EID of each node remains unchanged, and IP addresses of nodes can dynamically change.
The embodiment of the invention provides a kind of IRS, and IRS is used to preserve, parsing and the EID of management node and the mapping relations between the IP address, and all nodes are all known EID and the IP address of IRS in the network.The structural representation of the embodiment of IRS comprises as shown in Figure 2 as lower module:
Mapping relations are preserved module: be used for the EID and the IP address of all nodes of storage networking (comprising multicast source), and the mapping relations information between EID and the IP address, mapping relations are preserved module and above-mentioned information can be kept in the database.The form schematic diagram that mapping relations are preserved the information of preserving in the module as shown in Figure 3, in Fig. 3, a resource record digital section is meant (EID, IP) the right number that writes down among the IRS; Verification and show the integrality of this memory contents.
Mapping relations parsing module: be used for the EID of parse node and the mapping relations between the IP address.When node need be resolved EID, it sent to IRS and carries the identity analysis request message of this EID information, this EID of request analysis; After IRS receives this identity analysis request message, search the mapping relations information of oneself preserving, find and the corresponding IP of this EID address, return the identity of carrying this EID and corresponding IP address information to node then and resolve response message.The form schematic diagram of above-mentioned identity analysis request message and identity parsing response message as shown in Figure 4.Being described below of each field among Fig. 4:
Identification field: by the CLIENT PROGRAM setting and by the server return results, whether CLIENT PROGRAM comes definite response and request to mate by it.
QR field: the type of expression message.0 expression identity analysis request message, 1 expression identity is resolved response message.
The rcode field: whether expression makes a mistake to the parsing of EID.Logical accepted value 0 expression is free from mistakes, and represents to take place mistake with value 1, and the mistake ordinary circumstance takes place be: specifying needs the EID that resolves not exist.
An inquiry digital section: the number of the EID of expression request analysis.Resolve response message for identity, the value of this field is 0.
A resource record digital section: the IP address number that expression is resolved to.For identity analysis request message, the value of this field is 0.
Inquiry EID field: the EID value that the expression request is resolved, this field size is variable.Resolve response message for identity, the value of this field is 0.
Acknowledgement field: the IP address information of gained after expression is resolved EID, this field size is variable.For identity analysis request message, the value of this field is 0.
The mapping relations administration module: to the EID and the IP address of all nodes (comprising multicast source) of preserving, and bookkeepings such as the mapping relations between EID and the IP address increase, renewal and deletion.After node and multicast source are moved, send the address of carrying new IP address information to IRS and upgrade message, IRS upgrades the IP address of this node and multicast source after receiving this address renewal message, realizes node and the EID of multicast source and the dynamic mapping between the IP address.Described mapping relations administration module specifically comprises: node address update module and multicast source address update module.
Wherein, node address update module: be used for upgrading message according to the address of carrying its up-to-date IP address information that node sends, to described IP addresses of nodes information, and the mapping relations information between the EID of described node and the IP address is upgraded;
Wherein, multicast source address update module: be used for upgrading message according to the address of carrying its up-to-date IP address information that multicast source sends, to the IP address information of described multicast source, and the mapping relations information between the EID of described multicast source and the IP address is upgraded.
The structural representation of the system of the described realization cast communication of the embodiment of the invention comprises as shown in Figure 5: multicast source, recipient, couple in router and IRS.
Multicast source: be used for the managing multicast group, use the EID of node to make up multicast tree.Only comprising multicast source and recipient in this multicast tree, is a simple end-to-end relation, does not comprise intermediate node.Preserve the multicast member tabulation in the multicast source, preserve the mapping relations between each recipient EID and the IP address in this multicast member tabulation.After occurrence positions moves, send the address to IRS and upgrade message.
Each multicast group of multicast source management all has the identify label G of oneself
EID, the present invention uses (S
EID, G
EID) expression multicast group, wherein a S
EIDBe the identify label of multicast source, G
EIDIt is the identify label of multicast group.
Couple in router: couple in router has constituted the middle layer node of system of the present invention, does not need to preserve the state information of application layer multicast tree in couple in router, does not also need the application layer multicast tree is safeguarded, just is responsible for the forwarding of packet.Couple in router uses traditional unicast protocol OSPF (Open Shortest Path First) to carry out the routing and the transmission of multicast packet at the IP layer, can guarantee that multicast source is a shortest path to the information transmission path between the recipient.
The recipient: have EID and the IP address information of IRS, and the EID information of the EID of multicast source and multicast group.Send identity analysis request message to IRS, obtain the IP address information of multicast source by the parsing of IRS.Send the multicast message that joins request to multicast source, add corresponding multicast group, the multicast data message that the receiving group source sends.After occurrence positions moves, send the address to IRS and upgrade message.
IRS: be used for EID of all nodes of preservation, parsing and supervising the network (comprising multicast source) and the mapping relations between the IP address.
The idiographic flow of the method for the described realization cast communication of the embodiment of the invention comprises the steps: as shown in Figure 6
Step 61: the EID (S that obtains multicast source as the recipient
EID) and the EID (G of multicast group
EID) after, can determine whether to add this multicast group, whether receive the service of this multicast group.If after determining to need to add this multicast group, then the recipient sends to IRS and carries S
EIDThe identity analysis request message of information, this S of request analysis
EID
After step 62:RS receives above-mentioned identity analysis request message, search the EID of the preservation in the own database and the mapping relations information between the IP address, find and above-mentioned S
EIDCorresponding IP address then, is returned the identity of carrying the IP address information that finds to the recipient and is resolved response message, S
EIDAnd the corresponding relation between its IP address is told to this recipient.
Step 63: the recipient is with the S that receives
EIDAnd the corresponding relation between its IP address preserves, and sends the multicast that carries multicast source EID and the recipient EID message that joins request to multicast source, and request adds this multicast group.Above-mentioned multicast join request message the form schematic diagram as shown in Figure 7.
In Fig. 7, type field is 1, represents that this message is the multicast message that joins request; The packet length field is represented the join request total length of message of multicast, represents with byte number; Whether checksum field is used for detection messages and is destroyed in transmission course.
Step 64: multicast source receives above-mentioned multicast that the recipient sends over and joins request behind the message, notes recipient's EID (R
EID).Then, multicast source sends to IRS and carries R
EIDThe identity analysis request message of information, this R of request analysis
EID
Step 65: after IRS receives above-mentioned identity analysis request message, search the EID that preserves in its database and the mapping relations information between the IP address, find and above-mentioned R
EIDCorresponding IP address.Then, return the identity of carrying the IP address information that finds to multicast source and resolve response message, R
EIDAnd the mapping relations between its corresponding IP address are told to multicast source.
Step 66:, recipient's EID and IP address are recorded in the multicast member tabulation when multicast source receives after above-mentioned identity that IRS sends over resolves response message.The form schematic diagram of the resource record of preserving in the multicast member tabulation as shown in Figure 8.In Fig. 8, resource record number field is represented the recipient's of record in the multicast member tabulation (EID, IP) right number; Checksum field shows the integrality of this memory contents.
Step 67: when carrying out actual cast communication, multicast source sends multicast data message by router to the recipient according to the recipient EID and the IP address of record in the multicast member tabulation.Should contain multicast group EID field in the header of multicast data message, make the recipient confirm that this data message is a multicast data message, also make the recipient confirm that this data message belongs to the multicast data message of which multicast group simultaneously.
The transmit mechanism of multicast data message is the same with the transmit mechanism of general data message, does not need extra processing.Router in the network uses the OSPF Routing Protocol that this above-mentioned data message is carried out routing and forwarding.
Step 68: if the recipient wants to leave above-mentioned multicast group, no longer receive the multicast data message of above-mentioned multicast group, then the recipient sends to IRS and carries S
EIDThe identity analysis request message of information, request analysis S
EIDIRS searches and S after receiving this identity analysis request message
EIDCorresponding IP address.Then, resolve response message for this identity that the IP address that finds is carried in recipient's transmission, S
EIDAnd the relation of hinting obliquely between its corresponding IP address is told to this recipient.
Step 69: after the recipient obtains the IP address of multicast source, send the multicast leave message of carrying multicast source EID and recipient EID to multicast source.The form schematic diagram of multicast leave message such as above-mentioned shown in Figure 7.In Fig. 7, type field is 2, represents that this message is the multicast leave message; The packet length field is represented the total length of multicast leave message, represents with byte number; Whether checksum field is used for detection messages and is destroyed in transmission course.
Step 610: after multicast source receives the multicast leave message, obtain the recipient EID information of wherein carrying,, and send multicast data message no longer for this this recipient corresponding recipient EID in the multicast member tabulation and the deletion of IP address thereof.
After the recipient is moved, need safeguard that the handling process of concrete maintenance process comprises the steps: as shown in Figure 9 accordingly to the multicast tree in the above-mentioned multicast tree
Step 91, recipient carry the address renewal message of the new IP address of oneself to IRS and multicast source transmission, and the new address of oneself is told to IRS and multicast source.The form of above-mentioned address renewal message as shown in figure 10.Wherein, packet length field presentation address upgrades the total length of message, represents with byte number; Whether checksum field is used for detection messages and is destroyed in transmission course.
Step 92, IRS upgrade the recipient IP address information of preserving in its database after receiving above-mentioned address renewal message, and the IP address new with the recipient replaces the original IP address of recipient, the dynamic mapping in the fulfillment database between recipient EID and the IP address.
Multicast source upgrades the multicast member tabulation of oneself preserving after receiving above-mentioned address renewal message, and the IP address new with the recipient replaces the original IP address of recipient, the dynamic mapping during the realization multicast member is tabulated between recipient EID and the IP address.
Step 93, multicast source use the new IP address of recipient to send multicast data message to the recipient.
After multicast source is moved, need safeguard that the handling process of concrete maintenance process comprises the steps: as shown in figure 11 accordingly to the multicast tree in the above-mentioned multicast tree
Step 111, multicast source send the above-mentioned address of the new IP address of carrying oneself and upgrade message to IRS, the new address of oneself is told to IRS.
Step 112, IRS upgrades the multicast source IP address information of preserving in its database after receiving above-mentioned address renewal message, and the IP address new with multicast source replaces the original IP address of multicast source, the dynamic mapping in the fulfillment database between multicast source EID and the IP address.
Step 113, multicast source use its new IP address to send multicast data message to multicast member.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (12)
1. an identity resolution server is characterized in that, comprising:
Mapping relations are preserved module: be used to preserve the end hostid EID and the IP address of all nodes and multicast source, and the mapping relations information between EID and the IP address;
The mapping relations administration module: be used for mapping relations are preserved described EID and the IP address that module is preserved, and the mapping relations information between EID and the IP address increase, upgrade and delete at least one operation;
Mapping relations parsing module: be used for the analysis request of carrying EID information according to the node transmission, the query mappings relation is preserved the described mapping relations information of preserving in the module, obtain the IP address information of the EID correspondence of carrying in the described analysis request, this IP address information is returned to described node.
2. identity resolution server according to claim 1 is characterized in that, described mapping relations administration module specifically comprises:
The node address update module: be used for upgrading message according to the address of carrying its up-to-date IP address information that node sends, to described IP addresses of nodes information, and the mapping relations information between the EID of described node and the IP address is upgraded;
The multicast source address update module: be used for upgrading message according to the address of carrying its up-to-date IP address information that multicast source sends, to the IP address information of described multicast source, and the mapping relations information between the EID of described multicast source and the IP address is upgraded.
3. a system that realizes cast communication is characterized in that, comprising:
Multicast source: be used to obtain and preserve the EID of all nodes and the mapping relations information between the IP address; Make up and the managing multicast tree according to the EID information of all nodes, according to this multicast tree and IP addresses of nodes information by couple in router transfer and node between carry out cast communication;
Couple in router: use that Open Shortest Path First ospf protocol is carried out the transmission of multicast data message between multicast source and recipient;
Recipient: send the multicast message that joins request to multicast source, add corresponding multicast group; Carry out cast communication between transfer by couple in router and the multicast source.
4. the system of realization cast communication according to claim 3 is characterized in that, described system also comprises:
The identity resolution server: be used for preserving, the EID and the IP address of parsing and all nodes of supervising the network and multicast source, and the mapping relations information between EID and the IP address.
5. a method that realizes cast communication is characterized in that, comprising:
Multicast source obtains and preserves the EID of all nodes and the mapping relations information between the IP address; Make up with managing multicast according to the EID information of all nodes and to set;
Described multicast source is according to the transfer by couple in router of described multicast tree and IP addresses of nodes information, and carries out cast communication between the recipient.
6. the method for realization cast communication according to claim 5 is characterized in that, described method specifically comprises:
Represent the identify label of node with globally unique EID, represent the station location marker of node with the IP address, the EID of each node remains unchanged, and its IP address dynamically changes when node is moved.
7. the method for realization cast communication according to claim 5 is characterized in that, described method specifically comprises:
Described couple in router uses ospf protocol to carry out the transfer of multicast data message between multicast source and recipient.
8. according to the method for claim 5,6 or 7 described realization cast communications, it is characterized in that described method specifically comprises:
The identity resolution server is set, by this identity resolution server preserve, the EID and the IP address of all nodes and multicast source in parsing and the supervising the network, and the mapping relations information between EID and the IP address.
9. the method for realization cast communication according to claim 8 is characterized in that, described method specifically comprises:
The recipient sends to the identity resolution server and carries the identity analysis request message of multicast source EID information, described identity resolution server is according to described multicast source EID information, search the EID of its preservation and the mapping relations information between the IP address, find address, return the identity of carrying the IP address information that finds to the recipient and resolve response message with the corresponding IP of described multicast source EID information.
10. the method for realization cast communication according to claim 9 is characterized in that, described method specifically comprises:
The recipient is according to the IP address information of the multicast source that obtains, send the multicast carry multicast source EID and the recipient EID message that joins request to multicast source, multicast source receives this multicast and joins request behind the message, sends to the identity resolution server and carries the identity analysis request message of described recipient EID information;
After described identity resolution server receives described identity analysis request message, find address, return the identity of carrying the IP address information that finds to multicast source and resolve response message with the corresponding IP of described recipient EID;
Mapping relations between the described recipient's that described multicast source will receive EID and the IP address are preserved, according to described multicast tree and described recipient's IP address, carry out the communication of multicast data message between transfer by couple in router and the described recipient.
11. the method for realization cast communication according to claim 8 is characterized in that, described method specifically comprises:
When described recipient need leave described multicast group, described recipient sent the multicast leave message of carrying multicast source EID and recipient EID to described multicast source; After described multicast source receives described multicast leave message,, and send multicast data message no longer for described recipient with the described recipient EID and the deletion of IP address thereof of its preservation.
12. the method for realization cast communication according to claim 8 is characterized in that, described method also comprises:
When described multicast source or recipient after occurrence positions moves, send the address of carrying its up-to-date IP address to the identity resolution server and upgrade message, the identity resolution server after receiving described address renewal message upgrades described multicast source or recipient's IP address.
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