CN106375223A - SDN-based data forwarding system and method - Google Patents
SDN-based data forwarding system and method Download PDFInfo
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- CN106375223A CN106375223A CN201610936286.3A CN201610936286A CN106375223A CN 106375223 A CN106375223 A CN 106375223A CN 201610936286 A CN201610936286 A CN 201610936286A CN 106375223 A CN106375223 A CN 106375223A
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Abstract
The invention relates to the technical field of SDN, particularly to an SDN-based data forwarding system and method. The system comprises an SDN controller and an SDN switch. The SDN controller generates a multicast forwarding table according to an IGMP control message from the SDN switch and issues a flow table to the SDN switch based on the multicast forwarding table; and the SDN switch forwards or abandons an IGMP data message according to the flow table. On the basis of the SDN architecture, the SDN controller generates the all-network multicast forwarding table according to the IGMP control message and issues the flow table based on the multicast forwarding table, and the subsequent multicast flow is forwarded based on the flow stable, so that all-network multicast controlling is realized.
Description
Technical field
The invention belongs to sdn technical field is and in particular to a kind of data forwarding system based on sdn and method.
Background technology
If multiple main frames to be sent information to rather than All hosts in a network, realize according to broadcast mode, no
Unwanted main frame only can be sent information to and waste bandwidth, nor realize cross-network segment send；Real according to mode of unicast
Existing, the ip bag of repetition not only can take massive band width, also can increase the load of source host.So, traditional unicast and broadcast are logical
Letter mode can not efficiently solve single-point transmission, the problem of multipoint reception.Multicast refers to packet in ip network with as possible
The form of transmission is sent to the node set (i.e. multicast group) of certain determination, and its basic thought is: source host (i.e. multicast source) is only
Send a data, its destination address is multicast group address；All recipients in multicast group can receive same data and copy
Shellfish, and only have the main frame in multicast group can receive this data, and other main frame then can not receive.
Igmp snooping is internet group management protocol snooping(the Internet group
Management agreement spy upon) abbreviation, it is the multicast tied mechanism operating on two-layer equipment, for managing and controlling multicast group.
When two-layer equipment does not run igmp snooping, multicast packet is broadcasted at two layers；When two-layer equipment runs
It is known that the multicast packet of multicast group will not be broadcasted at two layers after igmp snooping, and it is multicast at two layers and connects to specified
Receipts person.The two-layer equipment running igmp snooping passes through the igmp message receiving is analyzed, and is port and multicast
Mac sets up mapping relations in address, and is set up according to such mapping relations and safeguard multicast forward table and according to multicast forwarding
Table carries out transmitting multicast data (if Fig. 1 is traditional igmp snooping technical schematic diagram).List item in multicast forward table has group
Broadcast mac address, source mac, vlan id, port bitmap etc..At present, some cpe(cpe: customer premise
Equipment, is physically located at the hardware of client layer, including modem, hub, switch, router) on be with soft
Part table is realizing igmp snooping function.Created using dynamic approach and delete list item, join message when receiving igmp
When, the memory headroom taking cpu immediately creates a software list item, when receiving igmp and leaving message, then leaves out this table
, discharge occupied memory headroom simultaneously.Created using this dynamic approach and delete software list item, continually distribute and release
Put internal memory, be easily caused the generation of memory fragmentation.
Patent as Publication No. cn103647720a discloses a kind of processing method and processing device of igmp snooping,
It is related to technical field of multicast, significantly reduce igmp snooping joins and departs from time delay, thus decreasing the switching of channel
Time, improve user's experience.The specific embodiment of this invention includes: online clamping receives enable igmp that main control card issues
Snooping and after opening the configuration leaving function immediately, when receiving the instruction message of main frame transmission it becomes possible to directly
Process this instruction message in line card.
Existing igmp snooping is distributed just for a certain switching equipment, configuration, if network topology is multiple
Miscellaneous, the configuration operation creating and deleting software list item using static method is very loaded down with trivial details.
Content of the invention
It is an object of the invention to provide a kind of stability is high, configuration is simple, network topology is simple, high efficiency can realize the whole network
The data forwarding system based on sdn of multicast forwarding and method.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that:
A kind of data forwarding system based on sdn, including sdn controller and sdn switch, sdn controller is handed over according to from sdn
The igmp changing planes controls message to generate multicast forward table, and issues flow table to sdn switch according to described multicast forward table；sdn
Switch forwards/abandons igmp data message according to described flow table.Wherein, igmp controls message, at least includes igmp report report
Literary composition, igmp leave message, igmp query message；Multicast forward table, at least includes multicast address information, inquiry port information,
Member port information；Inquiry port information, at least includes receiving the id information of the sdn switch of described igmp query message, connects
Receive the port information of described igmp query message；Member port information, at least includes receiving the sdn of described igmp report message
The id information of switch, receive described igmp report message port information, receive described igmp report message port old
Change temporal information.
Preferably, sdn controller is according to the igmp report message from member port, learn described igmp report report
The multicast ip address information of literary composition, generates member port information and adds to multicast forward table.
Preferably, sdn controller leaves message according to the igmp from member port, if this member port is group
Broadcast last member port in forward table, remove described multicast forward table；Otherwise, by corresponding for this member port member end
Message breath removes from multicast forward table.
Preferably, sdn controller is according to the igmp query message from inquiry port, learn described igmp query message
Multicast ip address, generate inquiry port information and simultaneously add to described multicast forward table.
Preferably, sdn switch receives igmp data message, if described igmp data message and described flow table
Join, then described igmp data message is forwarded according to described flow table.
Preferably, sdn switch receives igmp data message, if described igmp data message and described flow table are not
Join, then abandon described igmp data message.
Preferably, sdn switch receives igmp controls message, and it is forwarded to described sdn controller.
The invention also discloses a kind of data forwarding method based on sdn is it is adaptable to include sdn controller and sdn exchange
The sdn system of machine；It is as follows:
Step 1, sdn switch sends igmp and controls message to described sdn controller；
Step 2, sdn controller controls message to produce multicast forward table according to described igmp；
Step 3, sdn controller issues flow table to described sdn exchanger according to described multicast forward table；
Wherein, igmp controls message, at least includes igmp query message, igmp report message, igmp leave message；Multicast turns
Deliver, at least include multicast address information, inquiry port information, member port information；Inquiry port information, at least includes receiving
The id information of the sdn switch of described igmp query message, the port information of the described igmp query message of reception；Member port is believed
Breath, at least includes the id information receiving the sdn switch of described igmp report message, the end receiving described igmp report message
Message breath, the port ageing time information of the described igmp report message of reception.
Preferably, in step 2, sdn controller receives and controls message from the igmp of switch, and judges to control message
Type: if igmp report message, learn the multicast ip address information of described igmp report message, generate member port information
And add to multicast forward table；If igmp leaves message, judge that this igmp leaves the corresponding member port of message and is whether
Last member port in multicast forward table；If it is, removing described multicast forward table；Otherwise, by this member port
Corresponding member port information removes from multicast forward table；If igmp query message, study described igmp inquiry report
The multicast ip address of literary composition, generates inquiry port information and adds to described multicast forward table.
Preferably, carrying out step 1-1 before step 1, sdn switch receives multicast message, judges type of message；If
It is that igmp controls message, then be forwarded to sdn controller；If igmp data message and mating with described flow table, then according to
Described flow table forwards described igmp data message；If igmp data message and with described flow table mismatch, then abandon institute
State igmp data message.
The present invention is based on sdn framework, and sdn controller controls message to generate the multicast forward table of whole network according to igmp, and
Flow table is issued according to described multicast forward table, follow-up flux of multicast is forwarded according to described flow table, realizes the group of whole network
Broadcast Control system.
Brief description
Fig. 1 is traditional igmp snooping technical schematic diagram；
Fig. 2 is a kind of igmp snooping system schematic based on sdn of preferred embodiment of the present invention；
Fig. 3 is a kind of igmp snooping process chart based on sdn of preferred embodiment of the present invention；
Fig. 4 is a kind of sdn controller process chart of preferred embodiment of the present invention；
Fig. 5 is a kind of sdn switch processes flow chart of preferred embodiment of the present invention；
Fig. 6 is a kind of schematic diagram of the simulation test environment of preferred embodiment of the present invention.
Specific embodiment
The following is the specific embodiment of the present invention and combine accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
Embodiment one
As shown in Fig. 2 a kind of igmp snooping processing system based on sdn of the present embodiment, it includes sdn controller and sdn
Switch (s0, s1, s2, s3).Multicast server sends igmp by sdn switch s3 and inquires about (igmp query) message, right
Particular multicast group enters inquiry, and multicast client sends igmp by sdn switch s1 and reports that (igmp report) message proposes
Connection request, adds particular multicast group.
Sdn controller controls message to generate multicast forward table according to the igmp from sdn switch, and according to described multicast
Forward table issues flow table to sdn switch；Sdn switch forwards/abandons igmp data message according to described flow table.
Sdn controller should support the igmp snooping technical configuration task sequence based on sdn, should include based on sdn's
Igmp snooping function is opened or is closed.
| Configuration item | Implication |
| Igmp snooping function based on sdn | Open or close the igmp snooping function based on sdn |
Igmp controls message to be encapsulated on ip layer, specifically includes igmp inquiry (igmp report) message, igmp leaves (igmp
Leave) message, igmp inquiry (igmp query) message.
The igmp report message of multicast client, comprises the group that multicast client specifies particular multicast group to be added
Broadcast ip address.Igmp report message is received by member port, and is forwarded to sdn controller according to certain format is packed；
Sdn controller parses to the message receiving, and obtains and learn the multicast ip address comprising in this igmp report message
(multicast ip address, the unique mark of mark particular multicast group), obtains the sdn switch s1 receiving this igmp report message
Mac address and port numbers, and using this mac address and port numbers as member port information, add to multicast forward table.Group
Broadcast the addition that client completes particular multicast group.
In the present embodiment, study multicast ip address refers to: after sdn controller obtains multicast ip address, searches local
Whether there is the multicast forward table of this multicast ip address, if it does not exist, then setting up multicast forward table for this particular multicast group.
The igmp leave message of multicast client, comprises the multicast that multicast client specifies particular multicast group to be left
Ip address.Igmp leave message is received by member port, and is encapsulated as being forwarded to sdn controller according to certain format；sdn
Controller parses to the message receiving, and obtains the multicast ip address comprising in this igmp report message, obtains and receives
The mac address of sdn switch s1 of this igmp leave message and port numbers, and using this mac address and port numbers as member
Port information；According to obtain multicast ip this particular multicast group of address search multicast forward table, by this member port information from
This multicast forward table is deleted；If this member port is last member port in this multicast forward table, directly should
Multicast forward table is deleted.
The igmp query message of multicast server, comprises the multicast that multicast server specifies particular multicast group to be inquired about
Ip address.Igmp query message is queried port and receives, and is forwarded to sdn controller according to certain format is packed；Sdn is controlled
Device processed parses to the message receiving, and is forwarded to sdn controller according to certain format is packed；Sdn controller docks
The message receiving is parsed, and obtains and learn the multicast ip address comprising in this igmp report message, obtains to receive and is somebody's turn to do
The mac address of sdn switch s3 of igmp query message and port numbers, and using this mac address and port numbers as inquiry end
Message ceases, and adds to multicast forward table.Finally, flow table is issued according to multicast forward table.
Sdn switch s0, s2, receive multicast message, and judge type of message:
Control message if igmp, then this igmp control message is forwarded to sdn controller；
If igmp data message, then the flow table being issued this igmp data message with sdn controller further is mated:
If the match is successful, sdn switch forwards this igmp data message according to flow table；
If it fails to match, sdn switch abandons this igmp data message.
Sdn switch and sdn controller need to support to expand flow table, and it is defined as follows shown in table:
| Match field | Counter field | Instruction field |
| Multicast ip address | The bag that the match is successful is counted | Multicast data forwarding message |
Whether igmp data message is mated with flow table, that is, judge the match of the multicast ip address in igmp data message and flow table
Whether the multicast ip address in field mates.
The process flow of the igmp snooping processing system based on above-described embodiment is as shown in figure 3, concrete steps
As follows:
Step 1, sdn switch sends the igmp control message not mating flow table to sdn controller；
Step 2, sdn controller passes through parsing and obtains igmp control message, the mac address of sdn switch id(sdn switch),
Sdn switch ports themselves information (port numbers of sdn switch)；
Step 3, sdn controller generates multicast forward table；
Step 4, sdn controller issues flow table according to multicast forward table.
Sdn controller handling process such as Fig. 4.
Specifically, during step 2, sdn controller receives igmp from sdn switch and controls message, and judges
Igmp controls type of message, if igmp report message, learns the multicast ip address letter of described igmp report message
Breath, generates member port information and adds to multicast forward table.
During step 2, sdn controller receives igmp from sdn switch and controls message, and judges that igmp controls report
Civilian type, if igmp leave message, judges whether this corresponding member port of igmp leave message is multicast forwarding
Last member port in table: if it is, removing described multicast forward table；Otherwise, by corresponding for this member port one-tenth
Member's port information removes from multicast forward table.
During step 2, sdn controller receives igmp from sdn switch and controls message, and judges that igmp controls report
Civilian type, if igmp query message, learns the multicast ip address of described igmp query message, generates inquiry port letter
Cease and add to described multicast forward table.
Sdn switch processes flow process such as Fig. 5.
Specifically, before step 1, carry out step 1-1:sdn switch and receive multicast message, judge that type of message is
Igmp controls message or igmp data message.
Carry out in step 1-1, if it is determined that type of message be igmp control message, then by igmp control message send to
Sdn controller.
Carry out in step 1-1, if it is determined that type of message is igmp data message then determines whether igmp data message
The flow table whether being issued with sdn controller is mated.If igmp data message mismatches flow table, sdn switch abandons this igmp
Data message.If igmp data message mates flow table, sdn switch is according to this igmp data message of flow table forwarding multicasting.
To the technical scheme described in the present embodiment, tested, testing procedure is as follows:
Build test environment according to Fig. 6: include multicast server, multicast client a, multicast client b, sdn controller, sdn
Switch s0, sdn switch s1, sdn switch s2, sdn switch s3.Multicast client a and multicast client b and group
Broadcast server composition particular multicast group.
Multicast client a and multicast client b sends igmp report message and adds particular multicast group, multicast client a
Send igmp leave message with multicast client b and leave particular multicast group, multicast server sends igmp query message and looks into
Ask specific multicast group information and state.Sdn controller controls message to safeguard that multicast forward table: sdn is controlled according to the igmp receiving
Device processed is set up according to the igmp report message receiving and igmp query or is updated multicast forward table, according to receiving
Igmp leave message delete multicast forward table in related port information, or delete whole multicast forward table.
The igmp data message of flux of multicast is sent through sdn switch s3 by multicast server, and s3 switch receives this
After igmp data traffic, carry out that the match is successful with issuing flow table, igmp packet is forwarded to by sdn switch according to flow table
s1；After sdn switch s1 receives this igmp data, carry out that the match is successful with issuing flow table, send to multicast client a,
And by this igmp data forwarding to sdn switch s0；After sdn switch s0 receives this igmp data, and issue flow table
Carry out that the match is successful, send to multicast client b.
The technical solution used in the present invention is based on sdn framework, and its sdn controller controls message to generate the whole network according to igmp
The multicast forward table of network, and flow table is issued according to described multicast forward table, follow-up flux of multicast carries out turning according to described flow table
Send out, the multicast realizing whole network controls.
The data forwarding system based on sdn for the present invention and method have that stability is high, configuration is simple, network topology is simple,
High efficiency can realize the various features such as the multicast forwarding of the whole network.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Claims (10)
1. a kind of data forwarding system based on sdn, including sdn controller and sdn switch it is characterised in that: sdn controller
Control message to generate multicast forward table according to the igmp from sdn switch, and flow table is issued extremely according to described multicast forward table
Sdn switch；Sdn switch forwards/abandons igmp data message according to described flow table；
Wherein, igmp controls message, at least includes igmp report message, igmp leaves message, igmp query message；
Multicast forward table, at least includes multicast address information, inquiry port information, member port information；
Inquiry port information, at least includes receiving the id information of the sdn switch of described igmp query message, receives described igmp
The port information of query message；
Member port information, at least includes receiving the id information of the sdn switch of described igmp report message, receives described igmp
The port information of report message, the port ageing time information of the described igmp report message of reception.
2. a kind of data forwarding system based on sdn according to claim 1 it is characterised in that: sdn controller according to come
From the igmp report message of member port, learn the multicast ip address information of described igmp report message, generate member port letter
Cease and add to multicast forward table.
3. a kind of data forwarding system based on sdn according to claim 1 it is characterised in that: sdn controller according to come
Leave message from the igmp of member port, if this member port is last member port in multicast forward table, remove
Described multicast forward table；Otherwise, corresponding for this member port member port information is removed from multicast forward table.
4. a kind of data forwarding system based on sdn according to claim 1 it is characterised in that: sdn controller according to come
From the igmp query message of inquiry port, learn the multicast ip address of described igmp query message, generate inquiry port information simultaneously
Add to described multicast forward table.
5. a kind of data forwarding system based on sdn according to claim 1 or 2 or 3 or 4 it is characterised in that: sdn hand over
Change planes and receive igmp data message, if described igmp data message is mated with described flow table, institute is forwarded according to described flow table
State igmp data message.
6. a kind of i data forwarding system based on sdn according to claim 1 or 2 or 3 or 4 it is characterised in that: sdn hand over
Change planes and receive igmp data message, if described igmp data message is mismatched with described flow table, abandon described igmp data
Message.
7. a kind of data forwarding system based on sdn according to claim 1 it is characterised in that: sdn switch receive
Igmp controls message, and is forwarded to described sdn controller.
8. a kind of data forwarding method based on sdn is it is adaptable to include the sdn system of sdn controller and sdn switch；It is special
Levy is as follows:
Step 1, sdn switch sends igmp and controls message to described sdn controller；
Step 2, sdn controller controls message to produce multicast forward table according to described igmp；
Step 3, sdn controller issues flow table to described sdn exchanger according to described multicast forward table；
Wherein, igmp controls message, at least includes igmp query message, igmp report message, igmp leave message；
Multicast forward table, at least includes multicast address information, inquiry port information, member port information；
Inquiry port information, at least includes receiving the id information of the sdn switch of described igmp query message, receives described igmp
The port information of query message；
Member port information, at least includes receiving the id information of the sdn switch of described igmp report message, receives described igmp
The port information of report message, the port ageing time information of the described igmp report message of reception.
9. a kind of data forwarding method based on sdn according to claim 8 it is characterised in that: in step 2, sdn control
Device receives and controls message from the igmp of switch, and judges to control type of message；
If igmp report message, learn the multicast ip address information of described igmp report message, generate member port information
And add to multicast forward table；
If igmp leaves message, judge this igmp leave the corresponding member port of message be whether in multicast forward table
A member port afterwards；If it is, removing described multicast forward table；Otherwise, corresponding for this member port member port is believed
Breath removes from multicast forward table；
If igmp query message, learn the multicast ip address of described igmp query message, generate inquiry port information and add
Add to described multicast forward table.
10. a kind of data forwarding method based on sdn according to claim 9 it is characterised in that: carry out before step 1
Step 1-1, sdn switch receives multicast message, judges type of message；If igmp controls message, then it is forwarded to sdn control
Device；If igmp data message and mating with described flow table, then forward described igmp data message according to described flow table；As
Fruit is igmp data message and is mismatched with described flow table, then abandon described igmp data message.
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| CN113347031A (en) * | 2021-05-27 | 2021-09-03 | 中国电子科技集团公司第七研究所 | SDN virtual network construction system and construction method based on multicast mode |
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