CN101645835B - Method and system of host identity planar route of access network - Google Patents

Method and system of host identity planar route of access network Download PDF

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Publication number
CN101645835B
CN101645835B CN2009100916549A CN200910091654A CN101645835B CN 101645835 B CN101645835 B CN 101645835B CN 2009100916549 A CN2009100916549 A CN 2009100916549A CN 200910091654 A CN200910091654 A CN 200910091654A CN 101645835 B CN101645835 B CN 101645835B
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router
couple
access
main frame
access network
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CN101645835A (en
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郜帅
姚楠
张宏科
郭华明
周平
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Beijing Jiaotong University
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Beijing Jiaotong University
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Abstract

The invention provides a method and a system of host identity planar router of access network in the existing Internet, wherein the method comprises the following steps: adding an access router node to an access network; determining the position of a specified access router in the access network by the access router through a consistent Hashing algorithm and reporting the host-position relation of an access terminal to the access network; transmitting a data packet to the access terminal in the access network through establishing a tunnel by the access router; transmitting the data packet arriving at the external of the access network to an access switching router by the access router; and quitting the access network by the access router node. The system comprises the access terminal, the access router and the access switching router. The embodiment of the invention distributes variable-length host identity HID for the network access terminal and sends and receives the data to access terminals in the same or different access networks by the router method to reduce host identity router table items maintained by the access router.

Description

Access network host identity planar method for routing and system
Technical field
The present invention relates to access network host identity planar method for routing and system, is a kind of plane mark routing mode based on the distributed hash table algorithm, is the method that a kind of access network is supported elongated host identification data communication, belongs to data communication field.
Background technology
In the middle of routing architecture and routing forwarding mode research field, the complanation routing mode has become the domestic and international research focus.Query along with the route querying mode of existing network longest prefix match meets with increasing extensibility, people tend to a complanation routing mode (comprising main frame route, source routing and structuring DHT network routing mode) as a kind of method that solves the route scalability problem.
SEATTLE (A Scalable Ethernet Architecture for Large Enterprises, Princeton University) has provided a kind of method that the DHT algorithm carries out packet exchange of using in the middle of large-scale Ethernet.The existing relatively IP route network of Ethernet exchange will be more prone to configuration, implement and management, but extensibility is but superior not as the IP route network.SEATTLE has guaranteed the plug-and-play feature of large-enterprise network by implementing the addressing structure of complanation, and by the shortest path route with guarantee the availability and the extensibility of system based on the host information mechanism for resolving of distributed hash algorithm.But the work of SEATTLE only rests on the exchange aspect, and effective routing forwarding mechanism is not provided.
ROFL (Routing On Flat Labels) has provided a kind of plane method for routing that utilizes the addressing of complanation host identification in the Internet.ROFL proposes to guaranteeing the extensibility of future network routing architecture, route can be directly Network Based in the identifier of main frame, the while network layer protocol that can eliminate any routing mechanism dependence is determined the position of network like this.ROFL also provides simulation result and analysis, but the whole network extensibility of this method still remains to be discussed;
Compact Routing summarizes to existing complanation method for routing and hierarchical structure routing mode and classifies, Compact Routing has discussed for existing the Internet routing architecture many and has improved mechanism and provide at Stretch, the algorithm assessment and the proof of attributes such as Path, but its related work more rests on theoretical aspect, and the specific implementation method and the step that are proposed are left to be desired.
Summary of the invention
The end host sign that the objective of the invention is in access network adopts under the plane mark allocative decision of non-structureization, and a kind of mechanism that conventional router prefix Network Based is carried out routing forwarding that replaces is provided.The present invention proposes the access network routing plan based on the complanation identifier space, and it is central for the main frame that adopts the non-structure host identification provides route can reach information to be intended to access network, finishes quick, accurate transmit of packet in the middle of access network.
The technical scheme that the present invention takes is that access network host identity planar method for routing comprises step:
A, couple in router add the process of access network;
B, couple in router are reported the main frame-position corresponding relation that accesses terminal;
C, couple in router are the forwarding packet that accesses terminal in the access network;
The packet that D, couple in router will arrive the access network outside is forwarded to the access switch router;
E, couple in router withdraw from the process of access network;
Described step B specifically comprises step:
B1, access terminal and report self identity information to the couple in router of its access;
B2, couple in router generate host identification and couple in router position correspondence relationship information for accessing terminal;
B3, couple in router are determined the position of the appointment couple in router of management this main frame-position corresponding relation by compatible hash algorithm H;
B4, couple in router report described main frame-position corresponding relation to described appointment couple in router.
Access network host identity planar route system, comprise access terminal, couple in router, access switch router;
Described accessing terminal sends self identity message to couple in router;
Described couple in router, with access terminal and other couple in routers link to each other, for the agency that accesses terminal generates and responsible storage host sign and couple in router position corresponding relation, determine the position of the appointment couple in router of management this main frame-position corresponding relation by compatible hash algorithm H, to the main frame-position corresponding relation of specifying the couple in router registration to access terminal, for other couple in routers provide main frame-position corresponding relation inquiry service, constitute the routing device chain circuit state maintenance area with other couple in routers, safeguard accessibility by the bottom Routing Protocol;
Described access switch router as the gateway router of access network, receives and transmits the data traffic of going to every other access network, constitutes the routing device chain circuit state maintenance area with couple in router, safeguards accessibility by the bottom Routing Protocol.
The beneficial effect that the present invention produces is:
1. support the routing mechanism of elongated host identification by the hash algorithm, the existing route mechanism or the longest prefix match mode that continues to rely on are carried out route, elongated host identification can't be incorporated in the middle of the network, and improvements of the present invention are the methods that propose to support elongated host identification data communication in access network;
2. existing network relies on longest prefix match method route, can't provide good support for the complanation identifier space.The present invention will propose to support the routing mechanism of complanation host identification in access network;
3. existing route mechanism provides less support to the mobility of terminal in the network.The present invention supports the little of main frame to move by being combined in of hash algorithm and shortest path searching algorithm in the access network.
Description of drawings
Fig. 1 is the access network host identity planar route topological schematic diagram of embodiment one;
Fig. 2 is that the access network plane road of embodiment one is by the data flow schematic diagram;
Fig. 3 is embodiment three described access network host identity planar route router data repeating process schematic diagrames.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment one:
At first introduce the more used terms of present embodiment:
Host identification (HID): only be used for access network, representative accesses terminal or the open identity of subnet, and whether no matter terminal moves moves to diverse access point, and this sign does not change.For simply describing and making things convenient for call for Votes, present embodiment to suppose that each terminal only has a globally unique HID.
Couple in router: only in access network, occur, with access terminal and other couple in routers link to each other, for master agent generates and stores main frame-position relation, and to specifying couple in router registration main frame-position relation, provide main frame-position enquiring service to other couple in routers, constitute the routing device chain circuit state maintenance area with other couple in routers, safeguard accessibility by the bottom Routing Protocol;
Insert switch router (ASR): be used in access network and core network edge, as the access network gateway router, receive and transmit the data traffic of going to every other access network, constitute the routing device chain circuit state maintenance area with other couple in routers, safeguard accessibility by the bottom Routing Protocol.
As shown in Figure 1, in the present embodiment, access network host identity planar route system, comprise access terminal, couple in router, access switch router; Wherein access terminal, send self identity message to couple in router; Couple in router with access terminal and other couple in routers link to each other, for master agent generates and is responsible for storage host-position corresponding relation, to specifying couple in router registration main frame-position relation, for other couple in routers provide main frame-position enquiring service, constitute the routing device chain circuit state maintenance area with other couple in routers, safeguard accessibility by the bottom Routing Protocol; Described access switch router as the gateway router of access network, receives and transmits the data traffic of going to every other access network, constitutes the routing device chain circuit state maintenance area with other couple in routers, safeguards accessibility by the bottom Routing Protocol.
Above-mentioned access terminal comprise elongated host identification addressing structure, with the data transmit-receive unit of mutual self identity information of couple in router.
Implementation procedure of the present invention may be summarized to be following two stages, control messages transfer phase and data transfer phase, imbody as shown in Figure 2, have receiving terminal (Receiver), transmitting terminal (Sender), purpose couple in router Dest, source couple in router Src in the figure, specify couple in router DAR, corresponding step of each arrow among the figure, the concrete course of work is as follows:
S101, Receiver report self identity information to the couple in router of its access; Dest be Receiver generate HID and couple in router position corresponding relation (Receiver, Dest); Dest determines the appointment couple in router DAR of management this main frame-position corresponding relation by compatible hash algorithm H;
S102, Dest report this main frame-position corresponding relation to DAR;
It is the packet of Dest that S103, Sender send the destination to its couple in router; Src determines the position of the appointment couple in router DAR of management this main frame-position corresponding relation by compatible hash algorithm H;
S104, Src send to DAR with packet; DAR determines the position of the purpose couple in router Dest of access Receiver by inquiry self main frame-position correspondence relation storage;
S105, DAR are transmitted to Dest with packet;
S106, DAR inform the corresponding relation of Receiver on-position true with it in network simultaneously to notice message of Src loopback;
S107, Src receive the notice message of DAR, and the follow-up packet that arrives Receiver directly is forwarded to Dest; Dest receives the packet that arrives Receiver, the local main frame-position correspondence relation storage that inserts of inquiry, definite interface that inserts Receiver;
S108, Dest are transmitted to Receiver with packet; Receiver accesses terminal to receive behind the packet according to the application program indication and finishes communication process or send a reply or confirm packet to transmitting terminal.
To sum up state content and summarize access network host identity planar method for routing, may further comprise the steps:
A, access router node add the process of access network;
B, couple in router are reported the main frame-position relation that accesses terminal;
C, couple in router are the forwarding packet that accesses terminal in the access network;
The packet that D, couple in router will arrive the access network outside is forwarded to the access switch router;
E, access router node withdraw from the process of access network.
Above-mentioned steps A specifically comprises step:
A1, new couple in router add network, safeguard by route accessibility and logic connection status that link-state routing protocol is set up between the couple in router;
A2, new couple in router are sought the follow-up couple in router of self in access network, and to the adding of this follow-up router advertisement self;
A3, follow-up router travel through the main frame-position relation management tabulation of this machine storage, and (new node adds the back and is responsible for stored relation by new node) that wherein storage relation is changed sends to initiate node by notice message;
Above-mentioned steps B specifically comprises step:
B1, main frame are reported self identity information to the couple in router of its access;
B2, couple in router generate main frame HID and couple in router position correspondence relationship information for accessing terminal;
B3, couple in router are determined the appointment couple in router of management this main frame-position corresponding relation by compatible hash algorithm H;
B4, couple in router report this main frame-position corresponding relation to this appointment couple in router;
Above-mentioned steps C specifically comprises step:
C1, couple in router are determined the appointment couple in router position R of this host identification of management according to the packet rs destination host identification, by compatible hash algorithm H;
C2, couple in router are transmitted to this appointment couple in router R with packet;
C3, appointment couple in router R determine to insert this couple in router position Rd that accesses terminal by inquiring about main frame-position correspondence relation storage of self being in charge of;
C4, couple in router R are transmitted to this couple in router Rd with packet;
Local main frame-position the correspondence relation storage that inserts of C5, couple in router Rd inquiry is determined that purpose accesses terminal to insert the Rd interface;
C6, couple in router Rd are transmitted to purpose with packet and access terminal;
Above-mentioned steps E specifically comprises step:
E1, certain couple in router withdraw from from network, make in the access network other couple in routers remove this router from neighbor list by link-state routing protocol, and route accessibility and the logic connection status adjusted between couple in router are safeguarded;
Other couple in routers are removed the router node that withdraws from E2, the access network from this machine router neighbor list;
Local management main frame-position the relation list of other couple in routers traversal self in E3, the access network will re-register on the follow-up router that withdraws from router node by withdrawing from main frame-position corresponding relation that node is in charge of originally.
Embodiment two:
Present embodiment is about the improvement of couple in router on the basis of embodiment one.Couple in router comprises that terminal communication unit, main frame-position concern that generation unit, memory cell, main frame-position concern notification unit, main frame-position relational query service unit, Link State maintenance unit, route accessibility maintenance unit and data forwarding unit in the present embodiment;
The effect of the terminal communication unit interactive terminal identity information that is and accesses terminal;
Main frame-position concerns that the effect of generation unit is to being concerned by the terminal binding host identification HID of couple in router access and corresponding couple in router position thereof;
The effect of memory cell be to store by this couple in router be responsible for inserting local access network access terminal HID and himself position corresponding relation and be responsible for providing the main frame-position corresponding relation of inquiry service according to what compatible hash algorithm H determined by this couple in router;
Described main frame-position concerns notification unit, is used for announcing this corresponding relation to the couple in router of initiating inquiry after receiving about certain clauses and subclauses main frame-position relational query message for the first time, optimizes forward-path;
The effect of main frame-position relational query service unit is by the couple in router position of compatible hash algorithm H computation host sign HID correspondence and this main frame-position corresponding relation is reported to this appointment couple in router, and when transmitting packet to corresponding appointment couple in router search purposes main frame-position corresponding relation, handle main frame-position relational query message that other couple in routers send simultaneously;
The effect of Link State maintenance unit is and other couple in router interactive link states and router identifier information, forms topological database between the access network router;
The effect of route accessibility maintenance unit is to calculate the route entry that arrives each couple in router based on topological database between the access network router, safeguards the route accessibility between router;
The effect of data forwarding unit is to transmit and accesses terminal in the territory of sending and packet and the main frame between the couple in router-position relational query that overseas packet, other couple in routers send and report packet.
Embodiment three:
Present embodiment is to the improvement of embodiment one about step C2 process in the access network host identity planar method for routing.
Improvements are that step C2 specifically may further comprise the steps, as shown in Figure 3:
S21, for couple in router, if the packet that receives from user interface, then jumps to step S22; If the packet that receives then jumps to step S23 from router interface;
S22, be index with packet rs destination HID, search local routing table, if hit, then be forwarded to the corresponding interface, repeating process finishes; If miss, then generate and specify the couple in router positional information by hash function H, H (HID)=R, and packet is forwarded to this appointments couple in router R (setting up the tunnel between self and the appointment couple in router) with tunnel style, jump to step S25;
S23, if packet from the tunnel, then jump to step S24; If packet is not from the tunnel, be index with packet rs destination HID, search local routing table, if hit, then be forwarded to the corresponding interface; If miss, then abandon this packet, jump to step S25;
S24, with the decapsulation of tunneling data bag, be index with the former HID of packet, the inquiry local routing table if hit, then is forwarded to the corresponding interface; If miss, then inquire about main frame-position relation list of being in charge of, if hit, then be forwarded to corresponding couple in router with tunnel style, if miss, then be forwarded to and insert switch router ASR with tunnel style, jump to step S25;
S25, repeating process finish.

Claims (8)

1. access network host identity planar method for routing is characterized in that, comprises step:
A, couple in router add the process of access network;
B, couple in router are reported the main frame-position corresponding relation that accesses terminal;
C, couple in router are the forwarding packet that accesses terminal in the access network;
The packet that D, couple in router will arrive the access network outside is forwarded to the access switch router;
E, couple in router withdraw from the process of access network;
Described step B specifically comprises step:
B1, access terminal and report self identity information to the couple in router of its access;
B2, couple in router generate host identification and couple in router position correspondence relationship information for accessing terminal;
B3, couple in router are determined the position of the appointment couple in router of management this main frame-position corresponding relation by compatible hash algorithm H;
B4, couple in router report described main frame-position corresponding relation to described appointment couple in router.
2. method according to claim 1 is characterized in that, described steps A specifically comprises step:
A1, new couple in router add access network, safeguard by route accessibility and logic connection status that link-state routing protocol is set up between the couple in router;
A2, new couple in router are sought the follow-up couple in router of self in access network, and announce the adding of self to this follow-up couple in router;
A3, follow-up couple in router travel through the main frame-position corresponding relation managing listings of this machine storage, and the notice message that passes through that wherein storage relation is changed sends to initiate couple in router.
3. method according to claim 1 is characterized in that, described step C specifically comprises step:
C1, couple in router are determined the appointment couple in router position of management this main frame-position corresponding relation according to the packet rs destination host identification, by compatible hash algorithm H;
C2, couple in router are transmitted to this appointment couple in router with packet;
C3, appointment couple in router are determined the couple in router position that purpose accesses terminal by inquiring about main frame-position correspondence relation storage of self being in charge of;
C4, appointment couple in router are transmitted to the couple in router that purpose accesses terminal with packet;
Local main frame-position the correspondence relation storage that inserts of couple in router that C5, purpose access terminal inquiry is determined the access terminal interface of the couple in router that inserts of purpose;
The couple in router that C6, purpose access terminal is transmitted to purpose with packet and accesses terminal;
4. method according to claim 1 is characterized in that, step C, D are specially:
C21, for couple in router, if the packet that receives from user interface, then jumps to step C22; If the packet that receives then jumps to step C23 from router interface;
C22, be index with the packet rs destination host identification, search local routing table, if hit, then be forwarded to the corresponding interface, repeating process finishes; If miss, then generate and specify the couple in router positional information, and packet is forwarded to this appointment couple in router with tunnel style by compatible hash algorithm H, jump to step C25;
C23, if packet from the tunnel, then jump to step C24; If packet is not from the tunnel, be index with the packet rs destination host identification, search local routing table, if hit, then be forwarded to the corresponding interface; If miss, then abandon this packet, jump to step C25;
C24, with the decapsulation of tunneling data bag, be designated index with the former destination host of packet, the inquiry local routing table if hit, then is forwarded to the corresponding interface; If miss, then inquire about main frame-position corresponding relation tabulation of being in charge of, if hit, then be forwarded to corresponding couple in router with tunnel style, if miss, then be forwarded to the access switch router with tunnel style, jump to step C25;
C25, repeating process finish.
5. access network host identity planar method for routing according to claim 1 is characterized in that described step e specifically comprises step:
E1, certain couple in router withdraw from from access network, make in the access network other couple in routers remove this couple in router from neighbor list by link-state routing protocol, and route accessibility and the logic connection status adjusted between couple in router are safeguarded;
Other couple in routers are removed the couple in router that withdraws from E2, the access network from this machine router neighbor list;
Local management main frame-position corresponding relation the tabulation of other couple in router traversals self re-registers main frame-position corresponding relation of originally being in charge of by the couple in router that withdraws from the follow-up couple in router that withdraws from couple in router in E3, the access network.
6. access network host identity planar route system is characterized in that, comprise access terminal, couple in router, access switch router;
Described accessing terminal sends self identity message to couple in router;
Described couple in router, with access terminal and other couple in routers link to each other, for the agency that accesses terminal generates and responsible storage host sign and couple in router position corresponding relation, determine the position of the appointment couple in router of management this main frame-position corresponding relation by compatible hash algorithm H, to the main frame-position corresponding relation of specifying the couple in router registration to access terminal, for other couple in routers provide main frame-position corresponding relation inquiry service, constitute the routing device chain circuit state maintenance area with other couple in routers, safeguard accessibility by the bottom Routing Protocol;
Described access switch router as the gateway router of access network, receives and transmits the data traffic of going to every other access network, constitutes the routing device chain circuit state maintenance area with couple in router, safeguards accessibility by the bottom Routing Protocol.
7. access network host identity planar route system according to claim 6 is characterized in that, described access terminal comprise elongated host identification addressing structure, with the data transmit-receive unit of mutual self identity information of couple in router.
8. access network host identity planar route system according to claim 6, it is characterized in that described couple in router comprises terminal communication unit, main frame-position corresponding relation generation unit, memory cell, main frame-position corresponding relation notification unit, main frame-corresponding relation inquiry service unit, position, Link State maintenance unit, route accessibility maintenance unit and data forwarding unit;
Described terminal communication unit is used for and the interactive terminal identity information that accesses terminal;
Described main frame-position corresponding relation generation unit is used to the couple in router position of access terminal the bound host sign and the correspondence thereof of couple in router management to concern;
Described memory cell, be used to store be responsible for inserting access terminal host identification and this couple in router position of local access network by this couple in router corresponding relation, storage by this couple in router as specifying couple in router that the main frame-position corresponding relation of inquiry service is provided, wherein, this couple in router is as specifying couple in router to be determined according to compatible hash algorithm H by couple in router;
Described main frame-position corresponding relation notification unit is used for announcing this corresponding relation to the couple in router of initiating inquiry behind main frame-position corresponding relation data query bag of receiving for the first time about certain clauses and subclauses, optimizes forward-path;
Described main frame-corresponding relation inquiry service unit, position, be used for also this main frame-position corresponding relation being reported to this appointment couple in router by the appointment couple in router position of compatible hash algorithm H management of computing main frame-position corresponding relation, and when transmitting packet to specifying couple in router search purposes main frame-position corresponding relation, handle main frame-position corresponding relation data query bag that other couple in routers send simultaneously;
Described Link State maintenance unit is used for and other couple in router interactive link states and router identifier information, forms topological database between the access network router;
Described route accessibility maintenance unit is used for calculating the route entry that arrives each couple in router based on topological database between the access network router, safeguards the route accessibility between router;
Described data forwarding unit is used to transmit going to packet and the main frame between the couple in router-position corresponding relation inquiry that reaches the outer packet of access network, other couple in routers transmissions in the access network and reporting packet of accessing terminal and send.
CN2009100916549A 2009-08-31 2009-08-31 Method and system of host identity planar route of access network Expired - Fee Related CN101645835B (en)

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