CN101854692A - Subnet access method based on identity-position separate mapping mechanism - Google Patents
Subnet access method based on identity-position separate mapping mechanism Download PDFInfo
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Abstract
The invention belongs to the technical field of network communication, particularly relates to a subnet access method based on an identity-position separate mapping mechanism. The method is used for accessing a terminal into a virtual tree network structure comprising a switch router and a subnet router to realize a micromotion protocol. The method comprises the steps of: establishing the virtual tree network structure in a default route mode; setting the route mode of the subnet router into a host route mode and setting the route mode for accessing the switch router into a policy route mode; and accessing the terminal into the subnet router. By the identity-position separate mapping mechanism, the invention realizes the micromotion protocol, solves the extensible problem of a network route, reduces the switching delay of the terminal among networks, overcomes obstacles existing when a heterogeneous terminal is accessed into a network, and avoids the generation of triangular route.
Description
Technical field
The invention belongs to network communications technology field, relate in particular to a kind of subnet access method based on identity and position separate mapping mechanism.
Background technology
After entering into the 21st century of information technology develop rapidly, people are more and more higher to the demand of the communication technology, network technology, and the Internet has become an indispensable part in people's work and the life, and become the enormous motivation that promotes social progress.In recent years, internet scale enlarges rapidly, and number of users is advanced by leaps and bounds.Yet the Internet is born three during the last ten years, and people to the demand of the Internet significant variation have taken place, and this causes some original design defectives of the Internet to display gradually.Mobility tenability difference is exactly a huge bottleneck of traditional internet development.
Discover that the double attribute of IP address on semantics in the Internet protocol system is one of basic reason that causes problems.In the conventional the Internet protocol system, the IP address is the identity information of representation node both, the also positional information of representation node, but the double attribute of IP address has caused the serious route scaling problem in the Internet, makes the Internet be difficult to support to move and functions such as many locals.
The present invention proposes the thought of a kind of identity and position separate mapping mechanism, is that the identity information with the IP address in traditional the Internet separates with this dual nature of positional information.The terminal that no longer requires network moves the back and uses new address access network, and terminal is used unique just enjoy network service anywhere of access sign.This new network architecture with good mobility, fail safe and credibility does not also insert at subnet and proposes research.
Introduce the access of the polytype terminal of support that subnet can be more convenient, not only for the IP terminal, can also support the terminal of mobile radio communication, for example each Terminal Type of 3G (3rd-generation), WiMAX networks such as (Worldwide Interoperability for Microwave Access).
Simultaneously, the introducing that inserts subnet makes that moving of terminal no longer is to move through the grand of core net, and moving in the subnet promptly becomes little moving.Grandly move frequent switching meeting and send various management control messages to network, little move not only can reduce grandly move the management control messages that brings, and moving in subnet need not pass through core net again, significantly reduced handover delay.At present little mobile having become studied focus in the industry, the famous company of each colleges and universities and communication industry has all proposed at oneself little mobility protocol in the territory, move scheme CellularIP as the main frame that proposes by Ericsson and Columbia University, the wireless network HAWAII that moves in the support region that proposes by LucentTechnologies etc.
In view of the subnet access scheme that does not also have at present perfect identity and position separation mechanism, existing subnet research substantially all is based on mobile IP and is used as its macro-mobility.Consider ambulant design exactly for an important starting point that inserts the subnet design, i.e. little mobile design under existing macro-mobility.Present little mobility protocol all is in grand mobile research for being done under the mobile IP.
In order to support mobility, internet engineering task group (IETF, Internet EngineeringTask Force) has proposed a series of mobility supported protocols, comprises mobile IPv 4 (Mobile IPv4) and mobile IP v 6 (Mobile IPv6).MIPv4 and MIPv6 are the representative protocol of network layer mobile management mechanism, and part has solved the communication persistent problem of portable terminal in moving process.
Little mobility protocol is moving in switching frequent zonule.Little mobility protocol of IP and mobile IP form complementation, so that quick seamless switching strategy to be provided.Typical little mobility protocol comprises: IP (HMIP) and TeleMIP (Telecommunication EnhancedMobile IP) are moved in cellular ip (CellularIP), HAWAII, layering, and they all are the remarkable examples in the little mobility protocol of IP.
Cellular IP is by Columbia University and the support paging of Ericsson's proposition and little mobility protocol of a series of handover mechanisms.Cellular IP is made up of base station (BS) and Cellular IP gateway (Gateway) two large divisions, and agreement is based upon on the basis of IP packet forward.Between the Cellular IP gateway, the overall mobility of network supported by Mobile IP agreement, and in Cellular IP gateway inside, adopts the mobile management of cellular mobile system and the local mobility that handoff functionality comes network enabled.
The handover optimization wireless Internet structure (HAWAII) that Lucent Technologies proposes, different with Cellular IP, HAWAII is substitute I P but be operated on the IP not.Particular path changes among the agency before creating a mechanism and being used for being installed to the main frame route entry between the routing table of router or portable terminal and root area router, thereby supports local moving.
Move the registration process that a kind of different algorithm of IP (HMIP) employing is handled mobile IP by the layering that Ericsson and Nokia propose.Hierarchical Mobile IP is the far-end HA registration problem that the people such as former designer Charles E.Perkins by Mobile IP are suffered from order to improve Mobile IP, and supports IP to notify from a phone call, and the little mobility protocol that proposes.
Hierarchical Mobile IP is to supporting the expansion of the mobile IP of Foreign Agent classification between MN and HA.The tree-shaped hierarchy type management domain pattern that on mobile IP basis, has adopted the multilayer foreign agent FA to constitute.Because HMIP adopts the route point layering of single level to reduce the number of mobile management node in the network, compares the mobility protocol that other aim at the mobility routing Design, produces higher handover delay.
In summary, cellular ip (Cellular IP), HAWAII, layering are moved IP (HMIP) and are agreement based on MobileIP, perfect not enough, the two-way packets need process subnet summit router of communication mechanism between the terminal does not have the special routing plan of optimizing to this in the subnet.
Be different from Mobile IP based on terminal access scheme in the subnet of identity and position separation mechanism, there is not the distribution of CoA (anti-counterfeit certificate), terminal inserts and need not to register to HA, also need not bind with FA, need not set up the equipment that is similar to home agent among the mobile IP, need not introduce tunneling mechanism, encapsulation decapsulation that needn't process of passing through tunnel when packet send to receive, the notion that does not have the local router, there is not the triangle routing issue, and what the subnet scheme adopted is the mode of routing-based, effectively reduces terminal and moves time delay and packet loss problem in the handoff procedure.
Summary of the invention
The present invention is directed to present communication network in the deficiency that exists aspect the support mobility terminal, propose a kind of subnet access method based on identity and position separate mapping mechanism.
Technical scheme is, a kind of subnet access method based on identity and position separate mapping mechanism, be used for just that terminal is linked into the virtual tree mesh network structure that comprises switch router and subnet router, realize little mobility protocol, it is characterized in that described method comprises the following steps:
--set up virtual tree mesh network structure by the default route mode;
--the routing mode of subnet router is set to the main frame routing mode, and the routing mode that inserts switch router is set to tactful routing mode;
--terminal is inserted subnet router.
Describedly set up virtual tree mesh network structure by the default route mode and specifically be, with the leaf node of the subnet router in each subnet, for it is provided with default gateway as the tree network structure; Described default gateway is the upper level subnet router of subnet router or inserts switch router; With the root node of described access switch router as the tree network structure.
The routing mode of described subnet router is set to the main frame routing mode, the network prefix length of subnet router route is set to the length of the access sign of terminal, receive the access message or updating message of transmission of portable terminal or next stage subnet router when subnet router after, it is forwarded to the upper level subnet router or inserts switch router; Receive the affirmation message of the transmission that inserts exchange route or upper level subnet router when subnet router after, it is forwarded to the next stage subnet router.
The described routing mode that inserts switch router is set to tactful routing mode, insert switch router and a default route is set for each network interface card interface, be used to connect this network interface card interface and subnet router, and set up tactful routing table, write down the corresponding relation between network interface card interface and the subnet router.
Describedly terminal is inserted subnet router comprise that specifically access network, terminal move moving between the subnet under the same access switch router with terminal terminal first between the subnets under the different access switch router.
Described terminal access network first comprises the following steps:
Step 11: terminal sends to the subnet router that inserts and comprises the access message that terminal inserts sign;
Step 12: subnet router is set up one by the main frame route of described terminal to this subnet router after receiving and inserting message; And the access of described terminal sign and this main frame route added in the routing table of subnet router self, then upwards the primary subnet router sends described access message;
Step 13: after the upper level subnet router is received and inserted message, judge whether self is to insert switch router, if execution in step 14 then; Otherwise, repeating step 12;
Step 14: inserting switch router is described terminal distribution exchange Route Distinguisher, and the access sign in the access message that described exchange Route Distinguisher and described terminal are sent is made into one group of mapping relations, described mapping relations and described terminal are write the mapping relations table to the main frame route that inserts switch router, and deposit in the mapping server database;
Step 15: insert switch router and oppositely return acknowledge message to described terminal along the main frame route of setting up, the notice terminal is access network smoothly.
Described terminal moves between the subnet under the same access switch router and comprises the following steps:
Step 21: terminal sends to the subnet router that inserts and comprises the access message that terminal inserts sign;
Step 22: judge whether self is crossover router, if then execution in step 24; Otherwise, execution in step 23;
Step 23: subnet router is that described terminal is set up one by the main frame route of terminal to this subnet router, and in the routing table with the access of described terminal sign and described main frame route adding subnet router self, then will insert message and be sent to the upper level subnet router, return step 22;
Step 24: judge whether self is to insert switch router, if, execution in step 26; Otherwise, execution in step 25;
Step 25: subnet router is that described terminal is set up one by the main frame route of terminal to this subnet router, replace in the routing table simultaneously, original in the main frame route of terminal to this subnet router, and upwards the primary subnet router sends updating message, returns step 24;
Step 26: more new terminal is to the main frame route that inserts switch router, and the terminal after will upgrading writes the mapping relations table to main frame route and original mapping relations of access switch router, upgrades the mapping server database simultaneously; Along the rightabout of original terminal to the main frame route that inserts switch router, the primary subnet router sends acknowledge message downwards, terminal access sign in the routing table of deletion next stage subnet router self and terminal are to the main frame route of next stage subnet router, until terminal.
Described terminal moves between the subnet under the difference access switch router and comprises the following steps:
Step 31: terminal sends to the subnet router that inserts and comprises the access message that terminal inserts sign;
Step 32: subnet router is that terminal increases by one by the main frame route of described terminal to this subnet router; And the access of terminal sign and this main frame route added in the routing table of subnet router self, then upwards the primary subnet router sends described access message;
Step 33: after the upper level subnet router is received and inserted message, judge whether self is to insert switch router, if execution in step 34 then; Otherwise, repeating step 32;
Step 34: inserting switch router is described terminal distribution exchange Route Distinguisher, and the access sign in the access message that described exchange Route Distinguisher and described terminal are sent is made into one group of mapping relations, described mapping relations and described terminal are write the mapping relations table to the main frame route that inserts switch router, and deposit in the mapping server database;
Step 35: according to the mapping relations of preserving in the mapping server database, find the original affiliated access switch router of terminal, and send the terminal mobile messaging to it;
Step 36: the access switch router under terminal is original is upgraded original mapping relations, and along the main frame route of original foundation, the primary subnet router sends the terminal mobile messaging downwards, terminal access sign in the routing table of deletion next stage subnet router self and terminal are to the main frame route of next stage subnet router, till the afterbody subnet router;
Step 37: oppositely return acknowledge message to described terminal along the main frame route of setting up, the notice terminal is access network smoothly.
Described subnet router is also moved dynamic routing protocol.
Described terminal is a kind of in common desktop computer, personal digital assistant, Worn type computer, notebook computer, smart phone or the portable terminal of supporting 3G/WiMAX.
Effect of the present invention is, realize little mobility protocol by identity and position separate mapping mechanism, but solved the scaling problem of network route, reduced terminal time delay for switching between network, the obstacle that has faced when having overcome isomery type terminals access network has been avoided the generation of triangle route.
Description of drawings
Fig. 1 is the subnet access method flow chart based on identity and position separate mapping mechanism provided by the invention;
Fig. 2 is the terminal method flow diagram of the present invention under the access network situation first;
Fig. 3 is that terminal is switched schematic diagram between Intranet;
Fig. 4 is the of the present invention method flow diagram of terminal under switch instances between Intranet;
Fig. 5 is that terminal is switched schematic diagram between outer net;
Fig. 6 is the of the present invention method flow diagram of terminal under switch instances between outer net.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, rather than in order to limit the scope of the invention and to use.
Comprised in the network topology that polytype subnet inserts, and also has polytype terminal equipment.This diversified multi-type network meets network configuration in the reality, and some terminal or two-layer equipment are the access switch router that can directly insert under separation and the map architecture option, have avoided three layers data processing like this.Packet can go directly the access switch router and need not the multi-hop route.But, under some complex situations, must introduce this three-layer equipment of router, reached the purpose of UNE isomery and enlargement network range.So invention contains the infrastructure network that this structure of multilayer router is considered as inventing with subnet, other subnet that comprises switch, AP (Access Point, WAP (wireless access point)) or direct-connected terminal is the special circumstances of invention in fact.
Fig. 1 is the subnet access method flow chart based on identity and position separate mapping mechanism provided by the invention.Among Fig. 1, implementation procedure of the present invention is:
Step 1: set up virtual tree mesh network structure by the default route mode.
Virtual tree network structure is a kind of structure in logic, and the designed subnet of the present invention can be netted physically, but by for the router in each subnet is provided with default gateway network being developed into a kind of tree topology in itself.The default gateway here is exactly the upper level router of this router in fact, as long as the default gateway that can successively make progress for each configuration of routers at last, and all-router can both be linked under the common access switch router, just can form virtual tree network structure.In practical operation, with the leaf node of the subnet router in each subnet as the tree network structure, for it is provided with default gateway, default gateway is the upper level subnet router of subnet router or inserts switch router; The root node of switch router as the tree network structure will be inserted.
Step 2: the routing mode of subnet router is set to the main frame routing mode, and the routing mode that inserts switch router is set to tactful routing mode.
The routing mode of subnet router is set to the main frame routing mode, the network prefix length of subnet router route is set to the length of the access sign of terminal, receive the access message or updating message of transmission of portable terminal or next stage subnet router when subnet router after, it is forwarded to the upper level subnet router or inserts switch router; Receive the affirmation message of the transmission that inserts exchange route or upper level subnet router when subnet router after, it is forwarded to the next stage subnet router.
The routing mode that inserts switch router is set to tactful routing mode and specifically is, insert switch router and a default route is set for each network interface card interface, be used to connect this network interface card interface and subnet router, and set up tactful routing table, write down the corresponding relation between network interface card interface and the subnet router.
Step 3: terminal is inserted subnet router.
In the present invention, router also moves dynamic routing protocol in the subnet.Insert switch router except the operation dynamic routing protocol, identity is with outside shadowing agreement is separated in the position, the little mobility protocol that also moves the present invention and realized.Terminal is a kind of in the portable terminal of common desktop computer, personal digital assistant, Worn type computer, notebook computer, smart phone, support 3G or WiMAX.
In the present invention, terminal inserts subnet router three kinds of situations, and (1) terminal is access network first, and (2) terminal moves between the subnets under the different access switch router with (3) terminal mobile between the subnet under the same access switch router.In order to make implementation procedure of the present invention clearer, the different situations during to accessing terminal to network describe respectively with embodiment respectively below.
First kind of situation:
Fig. 2 is the terminal method flow diagram of the present invention under the access network situation first.Setting up virtual tree mesh network structure by the default route mode, and after the routing mode of the subnet router routing mode that is set to the main frame routing mode and inserts switch router is set to tactful routing mode, in Fig. 2, a process that never enters the accessing terminal to network of present networks is:
Step 11: terminal sends to the subnet router that inserts and comprises the access message that terminal inserts sign.
Step 12: subnet router is set up one by the main frame route of described terminal to this subnet router after receiving and inserting message; And the access of described terminal sign and this main frame route added in the routing table of subnet router self, then upwards the primary subnet router sends described access message.
Step 13: after the upper level subnet router is received and inserted message, judge whether self is to insert switch router, if then execution in step 14; Otherwise, repeating step 12.
Step 14: inserting switch router is described terminal distribution exchange Route Distinguisher, and the access sign in the access message that described exchange Route Distinguisher and described terminal are sent is made into one group of mapping relations, described mapping relations and described terminal are write the mapping relations table to the main frame route that inserts switch router, and deposit in the mapping server database.
Step 15: insert switch router and oppositely return acknowledge message to described terminal along the main frame route of setting up, the notice terminal is smoothly behind the access network, described method end.
Second kind of situation:
Fig. 3 is that terminal is switched schematic diagram between Intranet.Among Fig. 3, switching specifically is meant between Intranet, and the access switch router that terminal upwards finally reaches along subnet router still is the same access switch router before terminal is switched.The terminal of original access network moves to subnet router 6 from subnet router 4, its process such as Fig. 4.Terminal is switched access again in the subnet of tree network structure, will inevitably be formed into the new route of terminal.Terminal is so long as in the subnet under same access switch router when mobile, this new route will with old paths intersect, form a crosspoint.This crosspoint is called as crossover router, as the subnet router among Fig. 31.Existing old route (subnet router 4-subnet router 2-subnet router 1) to terminal has the new route (subnet router 6-subnet router 3-subnet router 1) to terminal again above it.Crossover router may be the subnet router that is in minimum one deck, also may be to be positioned at top access switch router, decides according to the span of terminal moving range.The mobile distribution that does not relate to mapping relations in the subnet just must be made renewal to the route of incoming terminal, comprises and sets up main frame route on the new route, deletes the old route on the old path.
Fig. 4 is the of the present invention method flow diagram of terminal under switch instances between Intranet, setting up virtual tree mesh network structure by the default route mode, and after the routing mode of the subnet router routing mode that is set to the main frame routing mode and inserts switch router is set to tactful routing mode, among Fig. 4, the procedure of terminal under switch instances between Intranet is:
Step 21: terminal sends to the subnet router that inserts and comprises the access message that terminal inserts sign.
Step 22: after subnet router is received and inserted message,, judge whether self is crossover router by whether the access sign of described terminal is arranged in the routing table of checking self, if then execution in step 24, otherwise, execution in step 23.See the subnet router 6 among Fig. 3, when terminal inserts subnet router 6, because this router is not a crossover router, so execution in step 23.
Step 23: subnet router is that terminal is set up one by the main frame route (terminal-subnet router 6) of terminal to this subnet router, and in the routing table with the access of described terminal sign and described main frame route adding subnet router self, then will insert message and be sent to upper level subnet router (subnet router 3), return step 22.
After returning step 22, upper level subnet router (subnet router 3) judges whether self is crossover router.Obviously subnet router 3 neither crossover router, subnet router 3 is set up one by the main frame route (terminal-subnet router 6-subnet router 3) of terminal to this subnet router for terminal, and in the routing table with the access of described terminal sign and described main frame route adding subnet router self, then will insert message and be sent to upper level subnet router (subnet router 1), return step 22.
After upper level subnet router (subnet router 1) is received access message, because the access sign of original terminal is arranged in its routing table, so its judgement oneself is a crossover router, execution in step 24.
Step 24: judge whether self is to insert switch router, if then execution in step 26; Otherwise, execution in step 25.
Because subnet router 1 is not to get involved switch router, so execution in step 25.
Step 25: subnet router (subnet router 1) is set up one by the main frame route (terminal-subnet router 6-subnet router 3-subnet router 1) of terminal to this subnet router for terminal, replace in the routing table simultaneously, it is original that (original main frame route is: terminal-subnet router 4-subnet router 2-subnet router 1) to the main frame route of this subnet router by terminal, then upwards the primary subnet router sends updating message, and returns step 24.
Among Fig. 3, the upper level subnet router of subnet router 1 is the access switch router, so execution in step 26.
Step 26: upgrade from terminal and (insert switch router by original terminal-subnet router 4-subnet router 2-subnet router 1-to the main frame route that inserts switch router, be updated to: terminal-subnet router 6-subnet router 3-subnet router 1-inserts switch router), and the terminal after will upgrading writes the mapping relations table to the main frame route and the original mapping relations that insert switch router, upgrades the mapping server database simultaneously.Opposite direction along original terminal to the main frame route that inserts switch router (inserting switch router-subnet router 1-subnet router 2-subnet router 4-terminal), the primary subnet router sends acknowledge message downwards, terminal access sign in the routing table of deletion next stage subnet router self and terminal are to the main frame route of next stage subnet router, until terminal.Such as in the routing table of subnet router 2, delete the access sign of this terminal and terminal main frame route (terminal-subnet router 4-subnet router 2) to subnet router 2.Subnet router 4 also in this way.
The third situation:
Fig. 5 is the different mobile schematic diagrames between subnet under the switch router that insert.Setting up virtual tree mesh network structure by the default route mode, and after the routing mode of the subnet router routing mode that is set to the main frame routing mode and inserts switch router is set to tactful routing mode, have wireless network card or be connected with the subnet router fixed time broadcast network notifications message of WAP (wireless access point), whether portable terminal constantly receives network notifications message, and detect self in view of the above and be moved.Finding that terminal self has moved to new following time of subnet router, needing to initiate to switch.Fig. 6 is the different mobile schematic diagrames between subnet under the switch router that insert.Among Fig. 6, terminal moves between the subnet under the difference access switch router and comprises the following steps:
Step 31: terminal sends to the subnet router that inserts and comprises the access message that terminal inserts sign.
Step 32: subnet router is that terminal increases by one by the main frame route of described terminal to this subnet router; And the access of terminal sign and this main frame route added in the routing table of subnet router self, then upwards the primary subnet router sends described access message.
In Fig. 5,, the main note route of terminal-subnet router 9 will be increased when the terminal formula that is moved.
Step 33: after the upper level subnet router is received and inserted message, judge whether self is to insert switch router, if execution in step 34 then; Otherwise, repeating step 32.
In Fig. 5, after the upper level subnet road of subnet router 9 device (subnet router 8) is received access message, judge it self is not to insert switch router, then repeating step 32, and promptly subnet router 8 increases by one by the main frame route (terminal-subnet router 9-subnet router 8) of described terminal to this subnet router for terminal; And the access of terminal sign and this main frame route are added in the routing table of subnet router 8 self, then upwards primary subnet router (subnet router 7) sends described access message.
After subnet router 7 receives to insert message, judge it self is not to insert switch router, then repeating step 32.
After access switch router 2 is received access message, execution in step 34.
Step 34: insert switch router 2 and be described terminal distribution exchange Route Distinguisher (the main note route of this moment is: terminal-subnet router 9-subnet router 8-subnet router 7-inserts switch router 2), and the access sign in the access message that described exchange Route Distinguisher and described terminal are sent is made into one group of mapping relations, described mapping relations and described terminal are write the mapping relations table to the main frame route that inserts switch router, and deposit in the mapping server database.
Step 35: according to the mapping relations of preserving in the mapping server database, find the original affiliated access switch router of terminal (inserting switch router 1), and send the terminal mobile messaging to it.
Step 36: the access switch router under terminal is original is upgraded original mapping relations, and along the opposite direction (inserting switch router 1-subnet router 1-subnet router 2-subnet router 4) of the main frame route of original foundation, the primary subnet router sends the terminal mobile messaging downwards, terminal access sign in the routing table of deletion next stage subnet router self and terminal are to the main frame route of next stage subnet router, till afterbody subnet router (subnet router 4).
Step 37: oppositely (insert switch router 2-subnet router 7-subnet router 8-subnet router 9-terminal) along the main frame route of setting up, return acknowledge message to described terminal, the notice terminal is access network smoothly.
After terminal is switched between difference inserts subnet under the switch router, if at first with this terminal communication, packet can be routed to by the access switch router under the Correspondent Node under the old access switch router (such as the access switch router 1 among Fig. 5) Correspondent Node.Old access switch router can be forwarded to this packet portable terminal affiliated new access switch router (such as the access switch router 2 among Fig. 5) this moment, and then the access switch router under Correspondent Node sends the message of a notice opposite end, the up-to-date mapping relations of terminal have wherein been comprised, tell its terminal to move away, be allowed to condition in the mapping table of opposite end mapping relations with portable terminal and be updated to up-to-dately, this is a kind of method of being avoided the triangle route.
The process and the mobility management mechanism that the present invention proposes virtual tree mesh network structure and insert the subnet route, realized the little mobility protocol under separation and the mapping mechanism, but solved the route scaling problem of core net effectively, reduced terminal simultaneously and moved time delay and packet loss problem in the handoff procedure.This method has also been unified the identify label of heterogeneous network terminal, for the access control of heterogeneous network terminal provides the basis.
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 (10)
1. subnet access method based on identity and position separate mapping mechanism is used for just that terminal is linked into the virtual tree mesh network structure that comprises switch router and subnet router, realizes little mobility protocol, it is characterized in that described method comprises the following steps:
--set up virtual tree mesh network structure by the default route mode;
--the routing mode of subnet router is set to the main frame routing mode, and the routing mode that inserts switch router is set to tactful routing mode;
--terminal is inserted subnet router.
2. a kind of subnet access method according to claim 1 based on identity and position separate mapping mechanism, it is characterized in that describedly setting up virtual tree mesh network structure by the default route mode and specifically being, with the leaf node of the subnet router in each subnet, for it is provided with default gateway as the tree network structure; Described default gateway is the upper level subnet router of subnet router or inserts switch router; With the root node of described access switch router as the tree network structure.
3. a kind of subnet access method according to claim 2 based on identity and position separate mapping mechanism, the routing mode that it is characterized in that described subnet router is set to the main frame routing mode and specifically is, the network prefix length of subnet router route is set to the length of the access sign of terminal, receive the access message or updating message of transmission of portable terminal or next stage subnet router when subnet router after, it is forwarded to the upper level subnet router or inserts switch router; Receive the affirmation message of the transmission that inserts exchange route or upper level subnet router when subnet router after, it is forwarded to the next stage subnet router.
4. a kind of subnet access method according to claim 2 based on identity and position separate mapping mechanism, it is characterized in that the described routing mode that inserts switch router is set to tactful routing mode and specifically is, insert switch router and a default route is set for each network interface card interface, be used to connect this network interface card interface and subnet router, and set up tactful routing table, write down the corresponding relation between network interface card interface and the subnet router.
5. a kind of subnet access method based on identity and position separate mapping mechanism according to claim 4 is characterized in that describedly terminal is inserted subnet router comprising that specifically access network, terminal move moving between the subnet under the same access switch router with terminal terminal first between the subnets under the different access switch router.
6. a kind of subnet access method according to claim 5 based on identity and position separate mapping mechanism, it is characterized in that described terminal first access network comprise the following steps:
Step 11: terminal sends to the subnet router that inserts and comprises the access message that terminal inserts sign;
Step 12: subnet router is set up one by the main frame route of described terminal to this subnet router after receiving and inserting message; And the access of described terminal sign and this main frame route added in the routing table of subnet router self, then upwards the primary subnet router sends described access message;
Step 13: after the upper level subnet router is received and inserted message, judge whether self is to insert switch router, if execution in step 14 then; Otherwise, repeating step 12;
Step 14: inserting switch router is described terminal distribution exchange Route Distinguisher, and the access sign in the access message that described exchange Route Distinguisher and described terminal are sent is made into one group of mapping relations, described mapping relations and described terminal are write the mapping relations table to the main frame route that inserts switch router, and deposit in the mapping server database;
Step 15: insert switch router and oppositely return acknowledge message to described terminal along the main frame route of setting up, the notice terminal is access network smoothly.
7. a kind of subnet access method based on identity and position separate mapping mechanism according to claim 5 is characterized in that described terminal mobile comprising the following steps: between the subnet under the same access switch router
Step 21: terminal sends to the subnet router that inserts and comprises the access message that terminal inserts sign;
Step 22: judge whether self is crossover router, if then execution in step 24; Otherwise, execution in step 23;
Step 23: subnet router is that described terminal is set up one by the main frame route of terminal to this subnet router, and in the routing table with the access of described terminal sign and described main frame route adding subnet router self, then will insert message and be sent to the upper level subnet router, return step 22;
Step 24: judge whether self is to insert switch router, if, execution in step 26; Otherwise, execution in step 25;
Step 25: subnet router is that described terminal is set up one by the main frame route of terminal to this subnet router, replace in the routing table simultaneously, original in the main frame route of terminal to this subnet router, and upwards the primary subnet router sends updating message, returns step 24;
Step 26: more new terminal is to the main frame route that inserts switch router, and the terminal after will upgrading writes the mapping relations table to main frame route and original mapping relations of access switch router, upgrades the mapping server database simultaneously; Along the rightabout of original terminal to the main frame route that inserts switch router, the primary subnet router sends acknowledge message downwards, terminal access sign in the routing table of deletion next stage subnet router self and terminal are to the main frame route of next stage subnet router, until terminal.
8. a kind of subnet access method based on identity and position separate mapping mechanism according to claim 5 is characterized in that described terminal mobile comprising the following steps: between the subnet under the difference access switch router
Step 31: terminal sends to the subnet router that inserts and comprises the access message that terminal inserts sign;
Step 32: subnet router is that terminal increases by one by the main frame route of described terminal to this subnet router; And the access of terminal sign and this main frame route added in the routing table of subnet router self, then upwards the primary subnet router sends described access message;
Step 33: after the upper level subnet router is received and inserted message, judge whether self is to insert switch router, if execution in step 34 then; Otherwise, repeating step 32;
Step 34: inserting switch router is described terminal distribution exchange Route Distinguisher, and the access sign in the access message that described exchange Route Distinguisher and described terminal are sent is made into one group of mapping relations, described mapping relations and described terminal are write the mapping relations table to the main frame route that inserts switch router, and deposit in the mapping server database;
Step 35: according to the mapping relations of preserving in the mapping server database, find the original affiliated access switch router of terminal, and send the terminal mobile messaging to it;
Step 36: the access switch router under terminal is original is upgraded original mapping relations, and along the main frame route of original foundation, the primary subnet router sends the terminal mobile messaging downwards, terminal access sign in the routing table of deletion next stage subnet router self and terminal are to the main frame route of next stage subnet router, till the afterbody subnet router;
Step 37: oppositely return acknowledge message to described terminal along the main frame route of setting up, the notice terminal is access network smoothly.
9. according to the described a kind of subnet access method of any claim in the claim 6,7 or 8, it is characterized in that described subnet router also moves dynamic routing protocol based on identity and position separate mapping mechanism.
10. according to the described a kind of subnet access method of any claim in the claim 6,7 or 8, it is characterized in that described terminal is a kind of in common desktop computer, personal digital assistant, Worn type computer, notebook computer, smart phone or the portable terminal of supporting 3G/WiMAX based on identity and position separate mapping mechanism.
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