CN102255814A - Method, device and system for selecting transfer path - Google Patents
Method, device and system for selecting transfer path Download PDFInfo
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- CN102255814A CN102255814A CN2011102198225A CN201110219822A CN102255814A CN 102255814 A CN102255814 A CN 102255814A CN 2011102198225 A CN2011102198225 A CN 2011102198225A CN 201110219822 A CN201110219822 A CN 201110219822A CN 102255814 A CN102255814 A CN 102255814A
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Abstract
The embodiment of the invention discloses a method, a device and a system for selecting a transfer path. Utilizing the technical proposal provided by the embodiment of the invention, the problem that the transfer path of data messages is different from the certification path of an access network so that a client cannot access the network in the prior art can be solved by analyzing the information such as IP (Internet Protocol) address of the client in a DHCP (Dynamic Host Configuration Protocol) response message, generating an optimized path information table and guiding the forwarding of the client data messages.
Description
Technical field
The present invention relates to network communication field, relate in particular to a kind of methods, devices and systems of selecting transfer path.
Background technology
There are three roles in the DHCP (Dynamic Host Configuration Protocol abbreviates DHCP as): dhcp client, Dynamic Host Configuration Protocol server and DHCP relay.When dhcp client and Dynamic Host Configuration Protocol server are in different sub-network, can DHCP protocol massages inter-network section be relayed to the purpose Dynamic Host Configuration Protocol server by DHCP relay, make that the dhcp client on the heterogeneous networks can a shared Dynamic Host Configuration Protocol server.
Broadband Remote Access Server (Broadband Remote Access Server, abbreviate BRAS as) be the novel IAD of using towards broadband network, be positioned at the edge of backbone network, the user who finishes various broadband access methods inserts, authenticates, charges, controls, manages, and realizes converging and transmitting of multiple business.BRAS can serve as Dynamic Host Configuration Protocol server simultaneously, after the authentication of finishing the user, send the DHCP back message using to DHCP relay, be used for distributing Internet protocol (Internet Protocol to dhcp client, abbreviate IP as) address and name server (Domain Name Server, abbreviate DNS as) etc. configuration information, and on BRAS, generate user's forwarding check table, source IP to the user, VLAN (Virtual Local Area Network, abbreviate VLAN as) etc. information check that the flow that prevents counterfeit user is from the BRAS device forwards.
If DHCP relay connects many BRAS simultaneously, perhaps there are many virtual links in DHCP relay to a BRAS, when the certification path of the data message transfer path of client and client access network is inconsistent, because according to transmitting check table, to the validity check of client data message failure, cause the client can't accesses network.
Summary of the invention
The embodiment of the invention provides a kind of methods, devices and systems of selecting transfer path, and is inconsistent with the certification path of the data message transfer path that solves client in the prior art and client access network, the problem that client can't accesses network.
According to an aspect of the present invention, the invention provides a kind of method of selecting transfer path, comprising:
Receive the dynamic host configuration protocol DHCP response message, comprise the Internet protocol IP address of client in the described DHCP response message;
Obtain preferred path information according to described DHCP response message, described preferred path information comprises the IP address of described client and the corresponding relation of the port-mark of the port that receives described DHCP response message;
The described preferred path information of record in the preferred path information table;
Receiving data packets;
Inquire about described preferred path information table according to the source IP address of described data message, when the IP address of an existing preferred path information that exists when the source IP address of described data message and described preferred path information table is identical, transmit described data message from described existing preferred path information middle port sign corresponding port.
According to another aspect of the present invention, the invention provides a kind of device of selecting transfer path, comprise receiver, acquiring unit, record cell, query unit and transmitter, wherein:
Described receiver is used to receive the dynamic host configuration protocol DHCP response message from server, comprises the Internet protocol IP address of client in the described DHCP response message; Described receiver also is used for receiving data packets;
Described acquiring unit is used for obtaining preferred path information according to described DHCP response message, and described preferred path information comprises the IP address of described client and the corresponding relation of the port-mark of the port that receives described DHCP response message;
Described record cell is used in the described preferred path information of preferred path information table record;
Described query unit is used for inquiring about described preferred path information table according to the source IP address of described data message;
Described transmitter, be used for the IP address of an existing preferred path information existing when the source IP address of described data message and described preferred path information table when identical, transmit described data message from described existing preferred path information middle port sign corresponding port.
According to another aspect of the present invention, the invention provides a kind of system of selecting transfer path, comprise the network equipment and server, wherein:
The described network equipment, be used to receive DHCP response message from described server, the IP address that comprises client in the described DHCP response message, obtain preferred path information according to described DHCP response message, described preferred path information comprises the IP address of described client and the port-mark of described DHCP response message; The described preferred path information of record in the preferred path information table; The described network equipment also is used for receiving data packets, inquire about described preferred path information table according to the source IP address of described data message, when the IP address of an existing preferred path information that exists when the source IP address of described data message and described preferred path information table is identical, transmit described data message from the port-mark corresponding port of described existing preferred path information.
Adopt technical scheme provided by the invention, by information such as client ip address in the parsing DHCP response message, generate the preferred path information table, the forwarding of directs client data message, the certification path that can solve the data message transfer path of client in the prior art and client access network is inconsistent, the problem that client can't accesses network.
Description of drawings
Fig. 1 is a kind of method flow diagram of selecting transfer path that the embodiment of the invention provides;
Fig. 2 is a kind of information interaction figure that selects transfer path that the embodiment of the invention provides;
Fig. 3 is the information interaction figure that the another kind that provides of the embodiment of the invention is selected transfer path;
Fig. 4 is the method flow diagram that the another kind that provides of the embodiment of the invention is selected transfer path;
Fig. 5 is a kind of device block diagram of selecting transfer path that the embodiment of the invention provides;
Fig. 6 is a kind of system block diagram of selecting transfer path that the embodiment of the invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.
The embodiment of the invention provides a kind of methods, devices and systems of selecting transfer path.Described method comprises: receive the DHCP response message, comprise the IP address of client in the described DHCP response message; Obtain preferred path information according to described DHCP response message, described preferred path information comprises the IP address of described client and the corresponding relation of the port-mark of the port that receives described DHCP response message; The described preferred path information of record in the preferred path information table; Receiving data packets; Inquire about described preferred path information table according to the source IP address of described data message, when the IP address of an existing preferred path information that exists when the source IP address of described data message and described preferred path information table is identical, transmit described data message from described existing preferred path information middle port sign corresponding port.The technical scheme that adopts the embodiment of the invention to provide, by information such as client ip address in the parsing DHCP response message, generate the preferred path information table, the forwarding of directs client data message, the data message transfer path that guarantees client is consistent with the certification path of client access network, realizes the normal accesses network of client.
Referring to Fig. 1, be a kind of method flow diagram of selecting transfer path that the embodiment of the invention provides, described method comprises:
101: the network equipment receives the DHCP request message from client, and to the described DHCP request message of server forwards; Described server is described client distributing IP address, and responds the DHCP response message; The described network equipment receives described DHCP response message, comprises the IP address of client in the described DHCP response message.
The described network equipment comprises the router with dhcp relay feature.
Described server comprises the router with dhcp server functionality, for example BRAS.
102: the described network equipment obtains preferred path information, and described preferred path information comprises the IP address of described client and the corresponding relation of the port-mark of the port that receives described DHCP response message;
The described network equipment can be resolved described DHCP response message, obtains the IP address of described client.
Described port-mark can be a port numbers; It can also be port numbers and VLAN sign.
The described network equipment can also obtain described VLAN sign according to described DHCP response message.
103: the described network equipment writes down described preferred path information in the preferred path information table.
Optionally, the described network equipment is set up described preferred path information table according to described DHCP response message.
The described network equipment is transmitted described DHCP response message to client.
104: described network equipment receiving data packets;
105: the described network equipment is inquired about described preferred path information table according to the source IP address of described data message;
106: when the IP address of an existing preferred path information that exists when the source IP address of described data message and described preferred path information table is identical, transmit described data message from described existing preferred path information middle port sign corresponding port.
When the IP address of any existing preferred path information in the source IP address of described data message and the described preferred path information table was all inequality, the described network equipment was transmitted described data message according to routing table.
For instance, as shown in Figure 2, customer end A is connected to BRAS1 and BRAS2 simultaneously by DHCP relay, and wherein the port Port1 of DHCP relay connects BRAS1, and the port Port2 of DHCP relay connects BRAS2.
During the customer end A access network, send the DHCP request message to Dynamic Host Configuration Protocol server, request distributing IP address by DHCP relay;
After DHCP relay was received the DHCP request message of customer end A transmission, the DHCP request message that customer end A is sent was transmitted to BRAS1;
After BRAS1 receives described DHCP request message, be customer end A distributing IP address and configuration information etc., and be encapsulated into and send to DHCP relay in the DHCP response message;
After DHCP relay is received described DHCP response message, resolve described DHCP response message and obtain the IP address ip-A that distributes to customer end A, port numbers Port1 and the IP-A that receives described DHCP response message recorded in the preferred path information table; Example is as shown in table 1:
Table 1 preferred path information table
| The IP address | Port numbers | ... |
| IP-A | Port1 |
DHCP relay is transmitted described DHCP response message to customer end A;
Customer end A is received described DHCP response message, obtains IP address ip-A and configuration information from described DHCP response message, for example DNS etc.
During the customer end A accesses network, the source IP address of the data message of transmission is IP-A;
After DHCP relay was received described data message, preferentially according to the source IP address of data message, promptly IP-A inquired about the preferred path information table;
When described preferred path information table existed the IP address of an existing preferred path information to be IP-A, from the port-mark corresponding port of described existing preferred path information, promptly Port1 transmitted described data message.Thereby the data message transfer path that guarantees client is consistent with the certification path of client access network.
Again for instance, as shown in Figure 3, the port Port1 of DHCP relay connects BRAS1, there are virtual link 1 and virtual link 2 between DHCP relay and the BRAS1, virtual link 1 corresponding VLAN1 (Virtual Local Area Network wherein, VLAN is called for short VLAN), virtual link 1 corresponding VLAN2.
During the customer end A access network, send the DHCP request message to BRAS1 by VLAN1;
After BRAS1 receives the DHCP request message, be customer end A distributing IP address and configuration information etc., and be encapsulated into and send to DHCP relay in the DHCP response message;
After DHCP relay is received described DHCP response message, resolve the DHCP response message and obtain the IP address ip-A that distributes to customer end A, will receive the port-mark Port1 and the VLAN1 of described DHCP response message, and IP-A records in the preferred path information table; Example is as shown in table 2:
Table 2 preferred path information table
| The IP address | Port numbers | The VLAN sign | ... |
| IP-A | Port1 | VLAN1 |
DHCP relay is transmitted described DHCP response message to customer end A;
Customer end A is received described DHCP response message, obtains IP address ip-A, configuration information etc.
During the customer end A accesses network, the source IP address of the data message of transmission is IP-A;
After DHCP relay is received described data message, preferentially according to IP-A inquiry preferred path information table;
When described preferred path information table exists the IP address of an existing preferred path information to be IP-A, transmit described data message from port-mark corresponding port Port1 and VLAN1.Thereby the data message transfer path that guarantees client is consistent with the certification path of client access network.
As shown in Figure 4, be the method flow diagram that the another kind that provides of the embodiment of the invention is selected transfer path, described method comprises:
The described network equipment can dispose the transfer path selection strategy, and the state of described transfer path selection strategy is set.
The network equipment receives the DHCP request message from dhcp client, and transmits described DHCP request message to Dynamic Host Configuration Protocol server; Described Dynamic Host Configuration Protocol server is described dhcp client distributing IP address, and responds the DHCP response message; The described network equipment receives described DHCP response message, comprises the IP address of dhcp client in the described DHCP response message.
When the state of described transfer path selection strategy is set to enable Enable, preferred path information when the described network equipment obtains the dhcp client access network, the described preferred path information of record is transmitted described DHCP response message to dhcp client then in the preferred path information table; When the state of described transfer path selection strategy was set to enable disable, the described network equipment was transmitted described DHCP response message to dhcp client.
Described network equipment receiving data packets.
When the state of described transfer path selection strategy is set to enable Enable, the described network equipment is inquired about described preferred path information table according to the source IP address of described data message, when the IP address of an existing preferred path information that exists when the source IP address of described data message and described preferred path information table is identical, transmit described data message from described existing preferred path information middle port sign corresponding port; When the IP address of any existing preferred path information in the source IP address of described data message and the described preferred path information table was all inequality, the described network equipment was transmitted described data message according to routing table.When the state of described transfer path selection strategy was set to enable disable, the described network equipment was transmitted described data message according to routing table.
The described network equipment is a DHCP relay.
Referring to Fig. 5, be a kind of device block diagram of selecting transfer path that the embodiment of the invention provides, described device comprises receiver 501, acquiring unit 502, record cell 503, query unit 504 and transmitter 505, wherein:
Described receiver 501 is used to receive the DHCP response message from server, comprises the IP address of client in the described DHCP response message; Described receiver 501 also is used for receiving data packets;
Described acquiring unit 502 is used for obtaining preferred path information according to described DHCP response message, and described preferred path information comprises the IP address of described client and the corresponding relation of the port-mark of the port that receives described DHCP response message;
Described record cell 503 is used in the described preferred path information of preferred path information table record;
Described query unit 504 is used for inquiring about described preferred path information table according to the source IP address of described data message;
Described transmitter 505, be used for the IP address of an existing preferred path information existing when the source IP address of described data message and described preferred path information table when identical, transmit described data message from described existing preferred path information middle port sign corresponding port.
Described device comprises the router with dhcp relay feature.
Optionally, described acquiring unit 502 also is used to obtain the VLAN sign of described client access network.
Described port-mark can be a port numbers; It can also be port numbers and VLAN sign.
Described device can also comprise:
Set up the unit, be used for before the described preferred path information of preferred path information table record, setting up described preferred path information table.
Described transmitter 505 also is used for transmitting described DHCP response message to client.
When the IP address of any existing preferred path information in the source IP address of described data message and the described preferred path information table is all inequality, described query unit 504 also is used for the destination address table of query and routing according to described data message, obtain next and jump out port-mark, described transmitter 505 be used for from described next jump out the port-mark corresponding port and transmit described data message.
Optionally, described device also comprises:
Policy unit is used to dispose the transfer path selection strategy, and the state that described transfer path selection strategy is set is for enabling Enable or removing to enable Disable.
When the state of described transfer path selection strategy when enabling Enable, described acquiring unit 502, record cell 503, query unit 504 and transmitter 505 are carried out above-mentioned corresponding operation.
When the state of described transfer path selection strategy when going to enable Disable, described query unit 504 is used for the destination address table of query and routing according to described data message, obtain next and jump out port-mark, described transmitter 505 be used for from described next jump out the port-mark corresponding port and transmit described data message.
Referring to Fig. 6, be a kind of system block diagram of selecting transfer path that the embodiment of the invention provides, described system comprises the network equipment 601 and server 602.Wherein:
The described network equipment 601, be used to receive DHCP response message from described server 602, the IP address that comprises client in the described DHCP response message, obtain preferred path information according to described DHCP response message, described preferred path information comprises the IP address of described client and the port-mark of described DHCP response message; The described preferred path information of record in the preferred path information table; The described network equipment also is used for receiving data packets, inquire about described preferred path information table according to the source IP address of described data message, when the IP address of an existing preferred path information that exists when the source IP address of described data message and described preferred path information table is identical, transmit described data message from the port-mark corresponding port of described existing preferred path information.
Described port-mark can be a port numbers; It can also be port numbers and VLAN sign.
The described network equipment 601 also is used for transmitting described data message according to routing table when the IP address of any existing preferred path information of the source IP address of described data message and described preferred path information table is all inequality.
The described network equipment comprises the router with dhcp relay feature.
Described server comprises the router with dhcp server functionality, for example BRAS.
The described network equipment 601 also is used to receive the DHCP request message from client, and transmits described DHCP request message to described server 602.
Described server 602 is used to receive described DHCP request message, is described client distributing IP address, and sends described DHCP response message to the described network equipment 601.
The described network equipment 601 also is used for transmitting described DHCP response message to described client.
The technical scheme that adopts the embodiment of the invention to provide, by information such as client ip address in the parsing DHCP response message, generate the preferred path information table, the forwarding of directs client data message, the certification path that can solve the data message transfer path of client in the prior art and client access network is inconsistent, the problem that client can't accesses network.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer-readable recording medium, described storage medium can be ROM/RAM, disk or CD etc.
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.
Claims (11)
1. a method of selecting transfer path is characterized in that, comprising:
Receive the dynamic host configuration protocol DHCP response message, comprise the Internet protocol IP address of client in the described DHCP response message;
Obtain preferred path information according to described DHCP response message, described preferred path information comprises the IP address of described client and the corresponding relation of the port-mark of the port that receives described DHCP response message;
The described preferred path information of record in the preferred path information table;
Receiving data packets;
Inquire about described preferred path information table according to the source IP address of described data message, when the IP address of an existing preferred path information that exists when the source IP address of described data message and described preferred path information table is identical, transmit described data message from described existing preferred path information middle port sign corresponding port.
2. method according to claim 1 is characterized in that, described method also comprises:
When the IP address of any existing preferred path information in the source IP address of described data message and the described preferred path information table is all inequality, transmit described data message according to routing table.
3. method according to claim 2 is characterized in that, before the DHCP response message that receives from server, also comprises:
Reception is from the DHCP request message of described client;
To the described DHCP request message of described server forwards.
4. according to each described method of claim 1 to 3, it is characterized in that, before obtaining preferred path information according to described DHCP response message, also comprise the transfer path selection strategy that configuration is local, the state of described transfer path selection strategy is set to enable Enable.
5. according to each described method of claim 1 to 4, it is characterized in that described port-mark comprises port numbers, perhaps
Described port-mark comprises port numbers and VLAN sign.
6. a device of selecting transfer path is characterized in that, comprises receiver, acquiring unit, and record cell, query unit and transmitter, wherein:
Described receiver is used to receive the dynamic host configuration protocol DHCP response message from server, comprises the Internet protocol IP address of client in the described DHCP response message; Described receiver also is used for receiving data packets;
Described acquiring unit is used for obtaining preferred path information according to described DHCP response message, and described preferred path information comprises the IP address of described client and the corresponding relation of the port-mark of the port that receives described DHCP response message;
Described record cell is used in the described preferred path information of preferred path information table record;
Described query unit is used for inquiring about described preferred path information table according to the source IP address of described data message;
Described transmitter, be used for the IP address of an existing preferred path information existing when the source IP address of described data message and described preferred path information table when identical, transmit described data message from described existing preferred path information middle port sign corresponding port.
7. device according to claim 6 is characterized in that described transmitter also is used for,
When the IP address of any existing preferred path information in the source IP address of described data message and the described preferred path information table is all inequality, transmit described data message according to routing table.
8. device according to claim 6, it is characterized in that, described device also comprises policy unit, be used for before obtaining preferred path information according to described DHCP response message, the transfer path selection strategy that configuration is local, the state of described transfer path selection strategy is set to enable Enable.
9. device according to claim 6 is characterized in that, described device also comprises sets up the unit, is used for setting up described preferred path information table before the described preferred path information of preferred path information table record.
10. a system of selecting transfer path is characterized in that, comprises the network equipment and server, wherein:
The described network equipment, be used to receive DHCP response message from described server, the IP address that comprises client in the described DHCP response message, obtain preferred path information according to described DHCP response message, described preferred path information comprises the IP address of described client and the port-mark of described DHCP response message; The described preferred path information of record in the preferred path information table; The described network equipment also is used for receiving data packets, inquire about described preferred path information table according to the source IP address of described data message, when the IP address of an existing preferred path information that exists when the source IP address of described data message and described preferred path information table is identical, transmit described data message from the port-mark corresponding port of described existing preferred path information.
11. system according to claim 8, it is characterized in that, the described network equipment also is used for transmitting described data message according to routing table when the IP address of any existing preferred path information of the source IP address of described data message and described preferred path information table is all inequality.
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Application publication date: 20111123 |