CN100396043C - Connection dismantling method and access device - Google Patents
Connection dismantling method and access device Download PDFInfo
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- CN100396043C CN100396043C CNB2006100651296A CN200610065129A CN100396043C CN 100396043 C CN100396043 C CN 100396043C CN B2006100651296 A CNB2006100651296 A CN B2006100651296A CN 200610065129 A CN200610065129 A CN 200610065129A CN 100396043 C CN100396043 C CN 100396043C
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Abstract
The present invention provides a connection dismantling method and access equipment based on conversion of a PPPoA to a PPPoE. The access equipment in the present invention can carry out connection dismantling operation in time according to an LCP terminal request message identified by the access equipment by receiving and identifying the LCP terminal request message sent by a connection dismantling initiating party. When the connection information stored in the access equipment is deleted, the access equipment can delete the connection information stored by the access equipment in time, and the phenomenon that unnecessary connection information occupies access equipment resources is avoided. Because the access equipment in the present invention can dismantle the connection in time, the phenomenon that after a PPPoA user abnormally drops, when access is initiated once more in a short time, the PPPoA user can not be normally accessed is avoided. Thereby, the purposes that the access equipment resources are saved and the connection dismantling method based on the conversion of the PPPoA to the PPPoE is perfected are realized by a technical scheme provided by the present invention.
Description
Technical field
The present invention relates to the network communications technology field, be specifically related to a kind of based on the connection method for dismounting and the access device of PPPoA to the PPPoE conversion.
Background technology
In broadband access network based on ATM (asynchronous transfer mode) technology, operator is when inserting the user, generally with the two-layer protocol of PPPoA (PPP Over ATM, ATM carries point-to-point protocol), so that utilize characteristics such as the good authentification of user of ppp protocol, management as access.Broadband access equipment does not change the encapsulation of message after receiving user's PPPoA message, directly give BRAS (Broadband Access Server, BAS Broadband Access Server) device processes with the PPPoA message transmission.
Because Ethernet (Ethernet) technology has cheapness, high bandwidth, is easy to characteristics such as broadband services lays, so, development trend become based on the broadband access network of Ethernet technology.For Incumbent, from the ATM access network to the process of Ethernet access network migration, need to keep PPPoA user's access module and use and experience.
For the smooth migration that realizes that PPPoA user inserts, at present, industry is mainly carried out PPPoA and is changed to PPPoE on broadband access equipment.Below in conjunction with accompanying drawing the PPPoA among the WT101 " Migration to Ethernet BasedDSL Aggregation " is described to the process of PPPoE conversion.
PPPoA to the process of PPPoE conversion as shown in Figure 1.
Among Fig. 1, PPPoA user is linked in the network, and the PPPoA that broadband access equipment is finished can be divided into 3 steps to the process of PPPoE conversion, promptly link setup, normally transmit and tear open chain.The chain process of tearing open among Fig. 1 is initiatively initiated by BRAS.
The incident that the triggering access device is removed certain user's connection mainly comprises following two kinds:
Incident 1, access device receive the PADT (PPPoE activates and finds end of packet) that BRAS sends, the connection of removing designated user among the PADT.
Incident 2, certain has been finished the link setup process, has been in the user of normal repeating process, do not changed, illustrated that fault has taken place in this user's connection, needed to remove if this user's transmitting-receiving bag counting is long-time.
Access device need be with the information deletion of transmitting middle relative users of forwarding module when removing user's connection, and in incident 1, access device need send to connect and remove message when removing connection to PPPoA user; In incident 2, access device need send simultaneously to be connected to PPPoA user and BRAS removes message.
According to ppp protocol among the RFC1661 and the PPPoE consensus standard among the RFC2516, user and BRAS can directly consult to tear open chain at the ppp protocol layer, and link is removed the initiator can be the user, also can be BRAS.
For PPPoE user, the user can directly initiate the PPP connection and be connected with PPPoE, when needs are removed the connection of PPPoE user between BRAS, no matter be to adopt LCP-Terminate (LCP termination) message packet in the ppp protocol to interrupt connecting at the PPP layer, still adopt the PADT message in the PPPoE agreement to interrupt connecting at the PPPoE layer, the connection between PPPoE user and the BRAS all can disconnect.Above-mentioned LCP-Terminate (LCP termination) message packet comprises: LCP Terminate-Request (LCP terminate request message) and LCP Terminate-Ack (LCP final response message).
But, for PPPoA user, because when realizing PPPoA to the conversion of PPPoE, the PPPoE that PPPoA user is set up between user and the BRAS by access device connects, PPPoA user only and set up the PPP connection between the BRAS, and, BRAS does not also know that the terminal use is PPPoA user or PPPoE user, so, when BRAS removes the initiator for connecting, BRAS may adopt the LCP-Terminate message packet to remove connection between itself and the PPPoA user, also may adopt the PADT message to remove connection between itself and the PPPoA user.When BRAS adopted the PADT message to remove connection, in accompanying drawing 1, access device can be with the information deletion of transmitting middle relative users of its forwarding module; When BRAS adopted the LCP-Terminate message packet to remove to connect, access device was not owing to capture the PADT message, thereby can not delete the information of relative users in the transmitting of its forwarding module.When PPPoA user when connect removing the initiator, access device is same owing to do not capture the PADT message, and can not delete the information of relative users in the transmitting of its forwarding module.
Above-mentioned access device can not delete transmit under the situation of respective user information, whether access device can only promptly have the transmitting-receiving bag by detecting user link by incident 2, determines whether to need to remove to connect.Like this, user and BRAS remove be connected after for a long time, access device just may be removed attended operation, like this, invalid user information can be stored in the access device for a long time, has wasted the resource of access device.
In addition, if when PPPoA user does not also utilize incident 2 to remove connection between PPPoA users and the BRAS at access device, initiate once to insert application again, access device can think that original connection is not disconnected by mistake, thereby, continue to use original stored user information to finish message and transmit.Because this moment, BRAS disconnected and being connected of this PPPoA user, and caused this PPPoA user's message to be dropped, and finally caused PPPoA user normally to insert.
Summary of the invention
The objective of the invention is to, provide a kind of based on the connection method for dismounting and the access device of PPPoA to the PPPoE conversion, access device is by identification LCP termination request message, and when identifying LCP termination request message, in time carry out and connect dismantling operation, avoided unnecessary link information to take the phenomenon of access device resource, perfect in the connection method for dismounting of PPPoA to the PPPoE conversion.
For achieving the above object, provided by the invention a kind of based on the connection method for dismounting of PPPoA to the PPPoE conversion, comprising:
Being connected in a, PPPoA user and the BAS Broadband Access Server removes the initiator and removes message to the opposite end transmission based on the connection of PPP;
B, access device are caught described connection based on PPP and are removed message, and are capturing after described connection based on PPP removes message, are sent to described initiator's opposite end with removing the information that connects, and carry out the operation of removing this connection.
Removing the initiator when described connection is: during BAS Broadband Access Server, described step b comprises:
Access device judges that the connection dismounting message based on PPP that BAS Broadband Access Server sends sends to PPPoA user, still sends to PPPoE user's;
If send to PPPoA user, then will remove the information that connects and be sent to described PPPoA user, and carry out the operation of removing this connection;
If send to PPPoE user, then directly described connection dismounting message based on PPP is transmitted to PPPoE user.
Removing the initiator when described connection is: during PPPoA user, described step b comprises:
Access device is caught the connection dismounting message based on PPP that PPPoA user sends, and after capturing described connection dismounting message based on PPP, sends the PADT message to BAS Broadband Access Server, carries out the operation of removing this connection; Perhaps
Access device is caught the connection dismounting message based on PPP that PPPoA user sends, and after capturing described connection dismounting message based on PPP, sends LCP termination request message to BAS Broadband Access Server, carries out the operation of this connection of dismounting.
The step of carrying out the operation of removing this connection among the described step b comprises:
This PPPoA user's who stores in the deletion access device forwarding-table item information.
Described method also comprises step:
Access device is removed the connection dismounting response message of initiator's transmission based on PPP to connecting.
The present invention also provides a kind of access device, comprising: forwarding module and control module;
Forwarding module: be used for catching and remove the connection dismounting message that the initiator sends to the opposite end being connected of PPPoA user and BAS Broadband Access Server, and the described message that it is caught is forwarded to control module based on PPP;
Control module: after receiving the next connection dismounting message of forwarding module transmission, be sent to the opposite end that the initiator is removed in described connection with removing the information that connects, and the operation of this connection is deleted in execution based on PPP.
Described forwarding module comprises:
Transmit submodule one: be used to catch the connection dismounting message that user side sends based on PPP, and will
Its this message of catching is forwarded to control module;
Transmit submodule two: be used to catch the connection dismounting message that BAS Broadband Access Server sends based on PPP, determining this message is when sending to PPPoA user's message, its this message of catching is forwarded to control module, determining this message is when sending to PPPoE user's message, and its this message of catching directly is forwarded to described PPPoE user.
Described control module comprises:
Send submodule: be used for after receiving the next connection dismounting message of forwarding module transmission, message being removed in described connection based on PPP being sent to the opposite equip. that the initiator is removed in described connection based on PPP;
Control submodule: be used for after receiving the next connection dismounting message of forwarding module transmission this PPPoA user's of storage information during the deletion access device is transmitted based on PPP.
Removing the initiator when connection is: during PPPoA user, send submodule after receiving the next connection dismounting message based on PPP of forwarding module transmission, the PADT message is sent to BAS Broadband Access Server.
Described control module also comprises:
Response submodule: be used for receiving after the connection based on PPP that forwarding module transmission comes removes message, remove the initiator and send based on the connection of PPP and remove response message to connecting.
Description by technique scheme as can be known, access device among the present invention is removed the LCP termination request message that the initiator sends by receiving and identifying to connect, make access device in time connect dismantling operation according to its LCP that identifies termination request message, as delete the information of this connection of storing in the access device, make access device can in time delete the information of this connection of its storage, avoided unnecessary link information to take the phenomenon of access device resource; Because the access device among the present invention can in time be removed connection, has avoided PPPoA user after improper rolling off the production line, when initiating to insert once more in the short time, the phenomenon that can't normally insert; Thereby realized saving access device resource by technical scheme provided by the invention, improved the purpose to the connection method for dismounting of PPPoE conversion based on PPPoA.
Description of drawings
Fig. 1 is the flow chart of the PPPoA of prior art to the PPPoE transfer process;
Fig. 2 is the process chart one of module in the connection method for dismounting of the embodiment of the invention and the access device;
Fig. 3 is the process chart two of module in the connection method for dismounting of the embodiment of the invention and the access device.
Embodiment
From description of the prior art as can be known, being connected in PPPoA user and BAS Broadband Access Server removes the initiator and sends LCP Terminate-Request message to the opposite end, when interrupting the connection between PPPoA user and the BAS Broadband Access Server, access device is not owing to capture the PADT message, so, can not in time carry out and remove the operation that this PPPoA user connects, can not delete the PPPoA user's of its storage information as access device.If access device can be carried out according to the LCP-Terminate message packet and remove the operation that this PPPoA user connects, access device is in time carried out removed the operation that this PPPoA user connects, thereby avoid because PPPoA user's information is stored in the phenomenon in the access device for a long time after removing connection.
Therefore, in technical scheme of the present invention, send when removing message such as present LCPTerminate-Request message to the opposite end when removing the initiator being connected in PPPoA user and the BAS Broadband Access Server based on the connection of PPP, access device should be able to be caught based on the connection of PPP and be removed message, and promptly access device should be able to identify from the message of its reception based on the connection of PPP and remove message.
The initiator is removed in above-mentioned connection can be PPPoA user, also can be BAS Broadband Access Server.When connect removing the initiator when be PPPoA user, PPPoA user is when need to determine to interrupt it and PPP between the BAS Broadband Access Server is connected, to BAS Broadband Access Server transmission LCP Terminate-Request message.When connect removing the initiator when be BAS Broadband Access Server, BAS Broadband Access Server need to determine interruption its when PPP between the PPPoA user is connected, send LCP Terminate-Request message to PPPoA user.
Access device is after capturing the LCP Terminate-Request message that connects dismounting initiator transmission, should carry out two operations, one is operating as: will remove the information that connects and be sent to the opposite end that connects the dismounting initiator, another is operating as: carry out the operation of removing this connection.
When connection dismounting initiator is PPPoA user, access device is that dismounting that BAS Broadband Access Server the sends information that connects can be LCP Terminate-Request message to opposite equip. that connect to remove the initiator, also the PADT message can be, message packet of self-defining message packet, expansion etc. can also be.
When connection dismounting initiator is BAS Broadband Access Server, access device is that dismounting that PPPoA user the sends information that connects can be LCP Terminate-Request message to opposite equip. that connect to remove the initiator, can also be for the message packet of self-defining message packet, expansion etc.
When connection dismounting initiator is BAS Broadband Access Server, access device need judge LCP Terminate-Request message that BAS Broadband Access Server sends be need send to PPPoA user, still need send to PPPoE user's, if send to PPPoA user, then access device need be carried out above-mentioned two operations; If send to PPPoE user, then access device only needs this LCPTerminate-Request message directly transmitted and gets final product.
After capturing the LCP Terminate-Request message that connects dismounting initiator transmission, the sequencing of two operations of execution does not limit to access device in the present invention, promptly can send the information that connects of removing earlier, the operation of back this connection of execution dismounting; Also can carry out earlier and remove the operation that connects, send the information that connects of removing again; Certainly, these two operations also can be carried out simultaneously.
The operation that the dismounting that above-mentioned access device is carried out connects can be identical with the operation that the dismounting of carrying out after access device in the prior art captures the PADT message connects, and deletes this PPPoA user's who stores in the forwarding-table item of its forwarding module information as access device.
Access device among the present invention can also be removed the connection dismounting response message of initiator's transmission based on PPP to connecting, as LCP final response message behind the LCPTerminate-Request message that captures connection dismounting initiator transmission.The present invention does not limit the sequencing of process that access device sends LCP final response message, two operations that above-mentioned access device is carried out.
Provided by the inventionly in the access device of PPPoE conversion, be provided with forwarding module and control module based on PPPoA.
Forwarding module is mainly used in: receive and discern and being connected in PPPoA user and the BAS Broadband Access Server remove the initiator and remove message to the connection based on PPP that the opposite end sends, as catch the LCPTerminate-Request message, after capturing LCP Terminate-Request message, this message is forwarded to control module.
Forwarding module is by transmitting submodule one and transmitting submodule two and form.
Transmit submodule one and be used to catch the LCP Terminate-Request message that user side sends, because PPPoE user is when the connection of removing between itself and the BAS Broadband Access Server, do not send the LCP-Terminate message packet, so the LCP Terminate-Request message of the user side that forwarding submodule one captures is the LCP Terminate-Request message that PPPoA user sends.Like this, transmit submodule one when capturing the LCP-Terminate message packet, directly this message is forwarded to control module and gets final product.
It is the LCPTerminate-Request message that BAS Broadband Access Server sends that forwarding submodule two is used to catch network side, transmit submodule two when receiving the LCPTerminate-Request message that broadband access equipment sends, need to judge that this LCP Terminate-Request message sends to PPPoA user, still send to PPPoE user's, if send to PPPoE user, directly this LCP Terminate-Request message is transmitted processing and get final product; If send to PPPoA user, then need this LCP Terminate-Request message is forwarded to control module.
Control module is mainly used in: after receiving forwarding module transmission next connection dismounting message such as LCP Terminate-Request message based on PPP, the information that remove to connect such as LCP Terminate-Request message or PADT message are sent to the opposite equip. that the initiator is removed in above-mentioned connection, and carry out the operation of deleting this connection, as deleting this PPPoA user's who stores in the access device forwarding-table item information.
Above-mentioned control module can be formed by sending submodule, control submodule and response submodule.
Send submodule and be mainly used in after receiving the next LCP Terminate-Request message of forwarding module transmission, LCP Terminate-Request message is sent to opposite equip. such as BAS Broadband Access Server or the PPPoA user who connects the dismounting initiator.
The control submodule is mainly used in: after receiving the next LCP Terminate-Request message of forwarding module transmission, and this PPPoA user's who stores in the deletion access device forwarding-table item information.
When connection dismounting initiator is PPPoA user, send submodule after receiving the next LCP termination request message of forwarding module transmission, can be not that BAS Broadband Access Server sends LCP Terminate-Request message, but send the PADT message to BAS Broadband Access Server to connecting the opposite equip. of removing the initiator.
Responding submodule is mainly used in: after receiving the next LCP Terminate-Request message of forwarding module transmission, remove response message to connecting dismounting initiator transmission based on the connection of PPP.
The present invention does not limit the sequencing of above-mentioned transmission submodule, control submodule, response submodule executable operations, both can carry out simultaneously, can successively carry out, and when successively carrying out, the sequencing of three submodule executable operations can be provided with arbitrarily yet.
Describe to the connection method for dismounting and the access device of PPPoE conversion based on PPPoA below in conjunction with 3 pairs in accompanying drawing 2, accompanying drawing are of the present invention.
When connect removing the initiator when be PPPoA user, the handling process of connection method for dismounting of changing to PPPoE based on PPPoA of the present invention and access device internal module as shown in Figure 2.
Among Fig. 2, when step 2-1, PPPoA user need to determine to interrupt it and PPP between the BRAS are being connected, transmission LCP Terminate-Request message.
Forwarding module in step 2-2, access device is caught the LCP Terminate-Request message that PPP connects, and LCP Terminate-Request message is sent to the control module of its place access device, make control module can carry out that PPP is connected the processing procedure of interrupting between PPPoA user and the BRAS.
To the control module of step 2-3, access device the LCPTerminate-Request message that the PPPoA user of its reception sends is transmitted to BRAS, make BRAS can carry out its with PPPoA user between PPP be connected the processing procedure of interrupting.
Control module at step 2-3, access device also can be after receiving PPPoA user's LCPTerminate-Request message, to sending the PADT message to BRAS.
Control module to step 2-4, access device sends LCP final response message to PPPoA user.
Delete this PPPoA user's who stores in the forwarding-table item of forwarding module of its place access device information to the control module of step 2-5, access device.
In above-mentioned description to Fig. 2, the order of step 2-3, step 2-4 and step 2-5 can be changed arbitrarily.
When connect to remove the initiator interrupt by LCP termination request message for BRAS and BRAS its with PPPoA user between be connected the time, the handling process of connection method for dismounting of changing to PPPoE based on PPPoA of the present invention and access device internal module is as shown in Figure 3.
Among Fig. 3, when step 3-1, BRAS determine to need are interrupting it and PPP between the PPPoA user are being connected, transmission LCP Terminate-Request message.
Catch the LCP termination request message of the PPP connection of BRAS transmission to the forwarding module of step 3-2, access device, the forwarding module of access device judge this LCP termination request message be send to PPPoE user, still send to PPPoA user, send to PPPoA user if judge this LCP termination request message, then forwarding module is sent to the control module of its place access device with this LCP termination request message, makes control module can carry out the processing procedure that PPP between PPPoA user and the BRAS is connected interruption; Send to PPPoE user if judge this LCP termination request message, then directly this LCP termination request message is transmitted to corresponding PPPoE user.
To the control module of step 3-3, access device the LCP termination request message that the BRAS of its reception sends is transmitted to PPPoA user, make PPPoA user can carry out its with BRAS between PPP is connected the processing procedure of interruption.
Control module to step 3-4, access device sends LCP final response message to BRAS.
Delete this PPPoA user's who stores in the forwarding-table item of forwarding module of its place access device information to the control module of step 3-5, access device.
In above-mentioned description to Fig. 3, the order of step 3-3, step 3-4 and step 3-5 can be changed arbitrarily.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (10)
1. one kind based on the connection method for dismounting of PPPoA to PPPoE conversion, it is characterized in that described method comprises step:
Being connected in a, PPPoA user and the BAS Broadband Access Server removes the initiator and removes message to the opposite end transmission based on the connection of PPP;
B, access device are caught described connection based on PPP and are removed message, and are capturing after described connection based on PPP removes message, are sent to described initiator's opposite end with removing the information that connects, and carry out the operation of removing this connection.
2. as claimed in claim 1 a kind ofly it is characterized in that based on the connection method for dismounting of PPPoA to PPPoE conversion, remove the initiator when described connection and be: during BAS Broadband Access Server, described step b comprises:
Access device judges that the connection dismounting message based on PPP that BAS Broadband Access Server sends sends to PPPoA user, still sends to PPPoE user's;
If send to PPPoA user, then will remove the information that connects and be sent to described PPPoA user, and carry out the operation of removing this connection;
If send to PPPoE user, then directly described connection dismounting message based on PPP is transmitted to PPPoE user.
3. as claimed in claim 1 a kind ofly it is characterized in that based on the connection method for dismounting of PPPoA to PPPoE conversion, remove the initiator when described connection and be: during PPPoA user, described step b comprises:
Access device is caught the connection dismounting message based on PPP that PPPoA user sends, and after capturing described connection dismounting message based on PPP, sends the PADT message to BAS Broadband Access Server, carries out the operation of removing this connection; Perhaps
Access device is caught the connection dismounting message based on PPP that PPPoA user sends, and after capturing described connection dismounting message based on PPP, sends LCP termination request message to BAS Broadband Access Server, carries out the operation of this connection of dismounting.
4. describedly a kind ofly it is characterized in that based on the connection method for dismounting of PPPoA the step of carrying out the operation of removing this connection among the described step b comprises as claim 1 or 2 or 3 to PPPoE conversion:
This PPPoA user's who stores in the deletion access device forwarding-table item information.
5. as claim 1 or 2 or 3 described a kind of connection method for dismounting that arrive the PPPoE conversion based on PPPoA, it is characterized in that described method also comprises step:
Access device is removed the connection dismounting response message of initiator's transmission based on PPP to connecting.
6. an access device that arrives the PPPoE conversion based on PPPoA is characterized in that described access device is provided with forwarding module and control module;
Forwarding module: be used for catching and remove the connection dismounting message that the initiator sends to the opposite end being connected of PPPoA user and BAS Broadband Access Server, and the described message that it is caught is forwarded to control module based on PPP;
Control module: after receiving the next connection dismounting message of forwarding module transmission, be sent to the opposite end that the initiator is removed in described connection with removing the information that connects, and the operation of this connection is deleted in execution based on PPP.
7. as claimed in claim 6 a kind of based on the access device of PPPoA to the PPPoE conversion, it is characterized in that described forwarding module comprises:
Transmit submodule one: be used to catch the connection dismounting message that user side sends, and this message that it is caught is forwarded to control module based on PPP;
Transmit submodule two: be used to catch the connection dismounting message that BAS Broadband Access Server sends based on PPP, determining this message is when sending to PPPoA user's message, its this message of catching is forwarded to control module, determining this message is when sending to PPPoE user's message, and its this message of catching directly is forwarded to described PPPoE user.
8. as claimed in claim 6 a kind of based on the access device of PPPoA to the PPPoE conversion, it is characterized in that described control module comprises:
Send submodule: be used for after receiving the next connection dismounting message of forwarding module transmission, message being removed in described connection based on PPP being sent to the opposite equip. that the initiator is removed in described connection based on PPP;
Control submodule: be used for after receiving the next connection dismounting message of forwarding module transmission this PPPoA user's of storage information during the deletion access device is transmitted based on PPP.
9. as claimed in claim 8 a kind of based on the access device of PPPoA to the PPPoE conversion, it is characterized in that, when connecting the dismounting initiator be: during PPPoA user, send submodule after receiving the next connection dismounting message of forwarding module transmission, the PADT message is sent to BAS Broadband Access Server based on PPP.
10. as claim 6 or 7 or 8 or 9 described a kind of access devices that arrive the PPPoE conversion based on PPPoA, it is characterized in that described control module also comprises:
Response submodule: be used for receiving after the connection based on PPP that forwarding module transmission comes removes message, remove the initiator and send based on the connection of PPP and remove response message to connecting.
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| CN1866893A (en) | 2006-11-22 |
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