CN103501491B - A kind of proxy mobile IPv 6 keeps the successional method of local routing - Google Patents
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Abstract
The present invention proposes to keep the successional method of local routing in a kind of proxy mobile IPv 6, the method is suitable for following scene: two mobile node MN 1 and MN2 are registered in respective local mobility anchor LMA1 and LMA2 respectively and carry out local routing by same access gateway MAG1, subsequently, MN2 switches to another and accesses gateway MAG2, MN1 and MN2 by MAG1 and MAG2 continuation local routing.Before MN2 switches, LMA1 and LMA2 has the local routing entry (LRE) including partner address respectively, and MAG1 also has LRE.When MN2 switches to MAG2 from MAG1, LRE relevant with MN2 in MAG1 with LMA1 will eliminate therewith, but LMA2 will retain the LRE relevant with MN2.When MN2 switches to MAG2 and after LMA2 re-registers, LMA2 utilizes the log-on message of LRE and MN2 retained to initiate local routing, the seriality of local routing after keeping switching.
Description
Technical field
The present invention relates to the communications field, be specifically related in a kind of proxy mobile IPv 6 keep local routing seriality
Method.
Background technology
Proxy mobile IPv 6 (PMIPv6, RFC5213) proposes the another kind of side solving IP mobility demand
Method.In PMIPv6, in network act on behalf of mobile entity perform and home agent between Signalling exchange and
The mobile node (MN) being connected on network is replaced to move management.This network mobile mechanism
Need not MN and participate in the mobility support of IP.In the structural system of PMIPv6, core functional entities is
Local mobility anchor (LMA) and Mobile Access Gateway (MAG).LMA is MN in PMIPv6 territory
Home agent, is responsible for maintaining the reachable state of MN and is the topological anchor node of MN home network prefix.
MAG is that instead of MN and performs the entity of mobile management function, and it is positioned on the link of MN institute anchor.
The message transmission procedure of traditional PMIPv6 is following (with mobile node MN 1 to mobile node MN 2
Transmitting procedure as a example by, the MAG that wherein MN1 accesses is designated as the LMA note that MAG1, MAG1 connect
The MAG accessed for LMA1, MN2 is designated as the LMA that MAG2, MAG2 connect and is designated as LMA2, sees
Fig. 1):
MN1 is to the home address (HoA1) that MAG1 transmission source address is MN1, and destination address is MN2
The message of home address (HoA2), after MAG1 receives this message, between MAG1 and LMA1
Tunnel message is issued LMA1, LMA1 message is discharged in network, this message is intercepted and captured by LMA2,
LMA2 inquires about list of bindings according to HoA2, then by the tunnel between LMA2 and MAG2 by message
Issue MAG2, MAG2, according to the destination address HoA2 of message, message is issued MN2.
Transmitting procedure from MN2 to MN1 is then the inverse process of said process.
But, MAG1 and MAG2 accessed as MN1 and MN2 is positioned in same carrier network
Time, this transmitting procedure but brings unnecessary delay, strengthens transmission cost and the data payload of LMA, and
And add the risk of network congestion.The prioritization scheme that local routing scheme proposes for the problems referred to above just, it
Allow MAG routing packets in subrange, it is not necessary to reversely route the packet to the LMA of MN, thus
Reduce delay, improve communication quality, and decrease the transmission cost on LMA and data payload.
File RFC6279 according to IETF task groups, the application scenarios of local routing can be subdivided into following four
(see Fig. 2):
A11: two MN access same MAG and LMA；
A21: two MN access same LMA but different MAG；
A12: two MN access same MAG but different LMA；
A22: two MN access different MAG and LMA.
The file " draft-ietf-netext-pmip-lr-07 " of IETF task groups for A11, A21, A12 this three
Plant scene, it is proposed that the solution of local routing.
1, the local routing of A11 scene
In A11 scene, LMA is the initiator of local routing.Fig. 3 is to set up local road under A11 scene
By flow process, detailed process is as follows:
(1) LMA sends local routing to MAG and initializes (Local Routing Initialization, LRI)
Message, the mobile option of message comprises [MN1-ID, MN1-HNP] and [MN2-ID, MN2-HNP]；
(2), after MAG receives the LRI message that LMA sends, first MAG inquires about in oneself configuration file
EnableMAGLocalRouting flag bit, if 1, show this MAG be configured to support this
Ground route, otherwise, shows that MAG does not support local road.If support local routing, MAG can be this two
Individual MN creates corresponding local routing entry (Local Routing Entry, LRE), and LRE contains this locality
Route binding: [mark of MN1-HNP → down hop] and [mark of MN2-HNP → down hop]；
(3) MAG replys local routing confirmation (Local Routing Acknowlege, LRA) to LMA
Message, the mobile option of message comprise [MN1-ID, MN1-HNP], [MN2-ID, MN2-HNP] and
Conditional code to LRI Message Processing result.Conditional code is that 0 expression local routing is successfully established, other value tables
Show the different reasons setting up local routing failure.
2, the local routing of A21 scene
In A21 scene, LMA is the initiator of local routing.Fig. 4 is to set up local road under A21 scene
By flow process, detailed process is as follows:
(1) LMA sends LRI (Opt1) message to MAG1, the mobile option of message comprise [MN1-ID,
MN1-HNP], [MN2-ID, MN2-HNP] and the address of MAG2；
(2) LMA sends LRI (Opt2) message to MAG2, the mobile option of message comprise [MN1-ID,
MN1-HNP], [MN2-ID, MN2-HNP] and the address of MAG1；
(3), after MAG1 receives LRI (Opt1) Message Processing that LMA sends, LRE, LRE are created
Comprise local routing to bind: [address of MN2-HNP → MAG2].Then, MAG1 replys to LMA1
LRA (Opt1) message；
(4), after MAG2 receives LRI (Opt2) Message Processing that LMA sends, LRE, LRE are created
Comprise local routing to bind: [address of MN1-HNP → MAG1].Then, MAG2 replys to LMA2
LRA (Opt2) message.
3, the local routing of A12 scene
In A12 scene, MAG is the initiator of local routing.Fig. 5 is to set up local road under A12 scene
By process, detailed process is as follows:
(1) MAG to LMA1 send LRI message (Opt1), the mobile option of message comprise [MN1-1D,
MN1-HNP], [MN2-ID, MN2-HNP] and the address of LMA2；
(2) MAG to LMA2 send LRI message (Opt2), the mobile option of message comprise [MN1-ID,
MN1-HNP], [MN2-ID, MN2-HNP] and the address of LMA1；
(3) LMA1 replys LRA (Opt1) message to MAG, message comprises indicate whether to allow into
The conditional code of row local routing, conditional code is that 0 expression allows local routing, and other values represent and do not allow local road
By different reasons；
(4) LMA2 replys LRA (Opt2) message to MAG, message comprises indicate whether to allow into
The conditional code of row local routing, conditional code is that 0 expression allows local routing, and other values represent and do not allow local road
By different reasons；
(5) MAG receives LRA (Opt1) and LRA (Opt2), if their conditional code is 0,
Then create LRE, LRE and contain local routing binding: [MN1-HNP → down hop mark] and
[MN2-HNP → down hop mark].
For A22 scene, the most still lack the effective scheme of setting up local routing corresponding with this scene.Cause
This, after A11 scene, A12 scene or A21 scene are switched to A22 scene, the most applying this locality
Two mobile nodes of route possibly cannot continue to apply local routing.
The present invention proposes a kind of (hereinafter referred to as A12 → A22 field after A12 scene is switched to A22 scene
Scape) keep the successional method of local routing, make mobile node remain to continue this locality in A12 → A22 field
Route.
Summary of the invention
The present invention proposes to keep the successional method of local routing in a kind of PMIPv6, makes originally carrying out this
The mobile node (hereinafter referred to as A12 → A22 scene) after A12 scene is switched to A22 scene of ground route
Remain to proceed local routing.
For convenience of narration, the present invention is designated as MAG1, MAG1 the MAG accessed before MN1 and MN2 switching
Two LMA connected are designated as LMA1 and LMA2 respectively.The MAG accessed after MN2 switching is designated as
MAG2。
(1) when A12 scene, MAG1 sets up LRE, wherein comprises local routing and binds: [MN1-HNP
→ down hop identifies] and [MN2-HNP → down hop mark].The communication process of A12 scene is as follows:
● if MN1 sends datagram to MN2, and MAG1 extracts according to the destination address of data message
MN2-HNP, inquires about LRE according to MN2-HNP, thus obtains the down hop mark of MN2,
Down hop further according to MN2 identifies, and data message is sent to MN2.
● if MN2 sends datagram to MN1, and MAG1 extracts according to the destination address of data message
MN1-HNP, inquires about LRE according to MN1-HNP, thus obtains the down hop mark of MN1,
Down hop further according to MN1 identifies, and data message is sent to MN1.
Application claims: LMA1 LRE to be set up, wherein comprise [MN1-ID, MN1-HNP],
[MN2-ID, MN2-HNP] and the address of LMA2；LMA2 LRE to be set up, wherein comprises
[MN1-ID, MN1-HNP], [MN2-ID, MN2-HNP] and the address of LMA1.
(2) when MN2 switches to MAG2 from MAG1, relevant with MN2 in MAG1 with LMA1
LRE will eliminate therewith, but LRE relevant with MN2 in LMA2 will retain a period of time (note: root
According to the regulation of PMIPv6, when MN2 leaves MAG1, MN2 will retain at the log-on message of LMA2
A period of time, in order to MN2 again when LMA2 registers, keeps MN2 home address by MAG2
Coherency.Therefore, it is rational that relevant with MN2 in LMA2 LRE retains the most in the lump).
(3) in A12 → A22 scene, LMA2 is the initiator of local routing.MN2 passes through MAG2
After LMA2 re-registers, the LRE triggering A12 relevant with MN2 that LMA2 retains according to oneself →
The local routing of A22 scene, detailed process is following (see Fig. 6):
● LMA2 obtains the address of LMA1 from the LRE oneself retained, and sends LRI (Opt1) to LMA1
Message, the mobile option of message comprises [MN1-ID, MN1-HNP], [MN2-ID,
MN2-HNP] and the address of MAG2；
● after LMA1 receives LRI (Opt1) message that LMA2 sends, determine according to MN1-HNP
MAG1, then sends LRI (Opt2) message to MAG1, and the mobile option of message includes
[MN2-ID, MN2-HNP], [MN2-ID, MN2-HNP] and the address of MAG2；
● after MAG1 receives LRI (Opt2) message that LMA1 sends, set up LRE, including this
Ground road binding: [address of MN2-HNP → MAG2].Then, MAG1 returns to LMA1
Multiple LRA (Opt2) message；
● after LMA1 receives LRA (Opt2) message that MAG1 replys, set up LRE, including
[MN1-ID, MN1-HNP], [MN2-ID, MN2-HNP] and the address of LMA2.So
After, LMA1 replys LRA (Op1) message to LMA2, including [MN1-ID,
MN1-HNP], [MN2-ID, MN2-HNP] and the address of MAG1；
● after LMA2 receives LRA (Op1) message that LMA1 replys, send LRI (Opt3) to MAG2
Message, including [MN1-ID, MN1-HNP], [MN2-ID, MN2-HNP] and
The address of MAG1；
● after MAG2 receives LRI (Opt3) message of LMA2, set up LRE, including local road
By binding: [address of MN1-HNP → MAG1].Then, MAG2 replys to LMA2
LRA (Opt3) message.
● after LMA2 receives LRA (Opt3) message that MAG2 replys, set up LRE, including
[MN1-ID, MN1-HNP], [MN2-ID, MN2-HNP] and the address of LMA1.Extremely
This, A12 → A22 scene local routing has configured.
(4) communication process of A12 → A22 scene.In A12 → A22 scene, if MN1 is to MN2
Sending datagram, MAG1 extracts MN2-HNP, according to MN2-HNP according to the destination address of data message
Inquiry LRE, thus obtain the address of MAG2, then data message is packaged, the data after encapsulation
Message, destination address is the address of MAG2, and source address is the address of MAG1.Data message after encapsulation
Without LMA1, it is sent directly to MAG2.MAG2 is to the data message decapsulation through encapsulation, so
According to the destination address of data message, data message is sent to MN2 afterwards.
Whereas if MN2 sends datagram to MN1, MAG2 is according to the destination address of data message
Extract MN1-HNP, inquire about LRE according to MN1-HNP, thus obtain the address of MAG1, the most right
Data message is packaged, the data message after encapsulation, and destination address is the address of MAG1, and source address is
The address of MAG2.Data message after encapsulation, without LMA2, is sent directly to MAG1.MAG1
To the data message decapsulation through encapsulation, then according to the destination address of data message, data message is sent to
MN1。
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the data message communication of tradition PMIPv6；
Fig. 2 is four kinds of application scenarios of local routing；
Fig. 3 is the flow chart initiating and setting up local routing under A11 scene；
Fig. 4 is the flow chart initiating and setting up local routing under A21 scene；
Fig. 5 is the flow chart initiating and setting up local routing under A12 scene；
Fig. 6 is the flow chart initiating and setting up local routing under A12 → A22 scene that the present invention proposes；
Detailed description of the invention
The detailed description of the invention of the method for A12 → A22 scene maintenance local routing that the present invention proposes is as follows:
(1) MN2 switches to MAG2 from MAG1.Now, the LRE that MAG1 and LMA1 maintains will
Delete therewith, and the log-on message of LRE and MN2 that LMA2 maintains will retain the regular hour.
(2) MN2 is authenticated by aaa server and obtains the address of LMA2 by MAG2；
(3) MAG2 is according to the regulation of PMIPv6, is that MN2 notes to LMA2 by PBU/PBA message
Volume, therefore LMA2 obtains the address of MAG2；
(4) LMA2 inquires about the LRE oneself retained and obtains the address of LMA1, sends LRI to LMA1
(Opt1) message, the mobile option of message comprises [MN1-ID, MN1-HNP], [MN2-ID, MN2-HNP]
Address with MAG2；
(5) after LMA1 receives LRI (Opt1) message that LMA2 sends, if refusal local routing,
Then reply LRA (Opt1) message, the conditional code non-zero of message to LMA2.If LMA1 accepts this locality
Route, then to MAG1 send LRI (Opt2) message, the mobile option of message comprise [MN1-ID,
MN1-HNP], [MN2-ID, MN2-HNP] and the address of MAG2；
(6) after MAG1 receives LRI (Opt2) message that LMA1 sends, if refusal local routing,
Then reply LRA (Opt2) message, the conditional code non-zero of message to LMA1.LMA1 receives MAG1 and sends out
After LRA (Opt2) message of the conditional code non-zero sent, to the LRA (Opt1) of LMA2 recoil state code non-zero
Message.If MAG1 accepts local routing, then set up LRE, bind including local routing:
[address of MN2-HNP → MAG2].Then, MAG1 is the LRA of zero to LMA1 recoil state code
(Opt2) message.
(7), after LMA1 receives the LRI that conditional code is zero (Opt2) message that MAG1 replys, LRE is set up,
Including [MN1-ID, MN1-HNP], [MN2-ID, MN2-HNP] and the address of LMA2.
Then, LAM1 to LRA (Opt1) message that LMA2 recoil state code is zero, including [MN1-ID,
MN1-HNP], [MN2-ID, MN2-HNP] and the address of MAG1.
(8) after LMA2 receives the LRA that conditional code is zero (Opt1) message that LMA1 replys, to MAG2
Send LRI (Opt3) message, the mobile option of message include [MN1-ID, MN1-HNP], [MN2-ID,
MN2-HNP] and the address of MAG1.
(9) after MAG2 receives LRI (Opt3) message that LMA2 sends, if refusal local routing,
Then reply LRA (Opt3) message, the conditional code non-zero of message to LMA2.If MAG2 accepts this locality
Route, then set up LRE, binds including local routing: [address of MN1-HNP → MAG1].So
After, MAG2 is to LRA (Opt3) message that LMA2 recoil state code is zero.
(10), after LMA2 receives the LRA that conditional code is zero (Opt3) message that MAG2 sends, set up
LRE, including [MN1-ID, MN1-HNP], [MN2-ID, MN2-HNP] and the ground of LMA1
Location.
(11) LRE that MAG sets up all has life cycle, sends out without local routing within a certain period of time
Raw, then MAG can eliminate LRE and inform LMA.LMA eliminates the LRE that oneself retains the most therewith.
Claims (1)
1. a proxy mobile IPv 6 (PMIPv6) keeps the successional method of local routing, it is characterised in that:
A, described PMIPv6 keep the successional method of local routing to be suitable for following scene: two mobile node MN 1 and MN2 are respectively respectively
From local mobility anchor LMA1 and LMA2 registers and carries out local routing by same access gateway MAG1, subsequently, MN2 switches to separately
One is accessed gateway MAG2, MN1 and MN2 and continues local routing by MAG1 and MAG2；
B, before MN2 switches, LMA1 has local routing entry (LRE), including [ID (MN1-ID) of MN1, MN1
Home address network prefix (MN1-HNP)], [the home address network prefix (MN2-HNP) of the ID (MN2-ID) of MN2, MN2]
Address with LMA2；LMA2 also has LRE, including: [MN1-ID, MN1-HNP], [MN2-ID, MN2-HNP] and LMA1
Address；MAG1 also has LRE, binds including local routing: [MN1-HNP → down hop mark] and [MN2-HNP → under
One jumps mark]；When MN2 switches to MAG2 from MAG1, LRE relevant with MN2 in MAG1 with LMA1 will eliminate therewith, but
LRE relevant with MN2 in LMA2 will retain a period of time；
C, switching to MAG2 and after local mobility anchor LMA2 of oneself re-registers as MN2, LMA2 initiates local routing, and step has
Body includes:
C1, LMA2 obtain the address of LMA1 from the LRE oneself retained, and send local routing initial (LRI) (Opt1) to LMA1 and disappear
Breath, comprises [MN1-ID, MN1-HNP], [MN2-ID, MN2-HNP] and the address of MAG2 in the mobile option of message；
After C2, LMA1 receive LRI (Opt1) message that LMA2 sends, determine MAG1 according to MN1-HNP, then send out to MAG1
Sending LRI (Opt2) message, the mobile option of message includes [MN2-ID, MN2-HNP], [MN2-ID, MN2-HNP] and MAG2
Address；
After C3, MAG1 receive LRI (Opt2) message that LMA1 sends, set up LRE, including the binding of local road:
[address of MN2-HNP → MAG2], then, MAG1 replys local routing response (LRA) (Opt2) message to LMA1；
C4, LMA1 receive MAG1 reply LRA (Opt2) message after, set up LRE, including [MN1-ID, MN1-HNP],
[MN2-ID, MN2-HNP] and the address of LMA2, then, LMA1 replys LRA (Op1) message to LMA2, including [MN1-ID,
MN1-HNP], [MN2-ID, MN2-HNP] and the address of MAG1；
After C5, LMA2 receive LRA (Op1) message that LMA1 replys, send LRI (Opt3) message to MAG2, including [MN1-ID,
MN1-HNP], [MN2-ID, MN2-HNP] and the address of MAG1；
After C6, MAG2 receive LRI (Opt3) message of LMA2, set up LRE, bind including local routing: [MN1-HNP → MAG1
Address], then, MAG2 replys LRA (Opt3) message to LMA2；
C7, LMA2 receive MAG2 reply LRA (Opt3) message after, set up LRE, including [MN1-ID, MN1-HNP],
[MN2-ID, MN2-HNP] and the address of LMA1.
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