CN102752197A - Method for simulating IGMP (internet group management protocol) finder and switch - Google Patents
Method for simulating IGMP (internet group management protocol) finder and switch Download PDFInfo
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- CN102752197A CN102752197A CN2012102111940A CN201210211194A CN102752197A CN 102752197 A CN102752197 A CN 102752197A CN 2012102111940 A CN2012102111940 A CN 2012102111940A CN 201210211194 A CN201210211194 A CN 201210211194A CN 102752197 A CN102752197 A CN 102752197A
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Abstract
The invention provides a switch. The switch has a IGMP Snooping function, and comprises a monitoring module and a simulation module, wherein the monitoring module is used for monitoring IGMP (internet group management protocol) common group query messages, and after an IGMP common group query message is monitored, locally recording an IP address of an IGMP finder sending the IGMP common group query message, and when the IGMP common group query message is not monitored in a preset time T, notifying the simulation module; and the simulation module is used for simulating the IGMP common group query message sent by the IGMP finder after the notice of the monitoring module is received, wherein the IP address of the simulated sent IGMP common group query message is the IP address of the IGMP finder recorded by the monitoring module. Corresponding to the switch, the invention also provides a method for simulating an IGMP finder. According to the invention, the technical implementation is simple, and no manual configuration process is involved, thereby simplifying the user operation; and a restriction that a management address must exist on the switch does not exist, thereby increasing the flexibility.
Description
Technical field
The present invention relates to the multicasting technology in the network data communication, relate in particular to a kind of method and switch of Simulation with I GMP requestor.
Background technology
In the existing multicast environment; Igmp querying device (IGMP Querier) generally is deployed on the convergence-level routing device; After perhaps the convergence-level routing device breaks down when having no progeny in two layers of access device and the convergence-level routing device physical link, can cause two layers of multicast forwarding list item on the access device to wear out because of the report message that can't receive downstream main process equipment adding multicast group.Flux of multicast just can not be incorporated into the main process equipment in downstream like this.
Current a kind of solution is a configuration igmp querying device on Layer 2 switch, and the address of user's given query device is layer 2-switched management address, and the requestor of this requestor on the convergence-level routing device participates in the competition, and the victor serves as the igmp querying device.Usually can make the convergence-level routing device win through configuration and serve as the igmp querying device.After perhaps the convergence-level routing device broke down when having no progeny in two layers of access device and the convergence-level routing device physical link like this, two layers of access device served as the igmp querying device automatically, send query message.
Current physical link interrupts or the problem of equipment fault though said method can solve; But still there are some problems in this method: 1, not necessarily have management address on the Layer 2 switch; If like this, said method has just lost the basis of dealing with problems; If on 2 two layers of access device more VLAN is arranged, then will be at the configuration querying device all of each VLAN on two layers of access device, more loaded down with trivial details like this; 3, because the address of the igmp querying device on Layer 2 switch is layer 2-switched management address; And this management address is user's appointment; If it is 0.0.0.0, the host subscriber of Windows can abandon this query message, and this has just lost the meaning that requestor exists.
Summary of the invention
In view of this; The present invention provides a kind of switch; This switch has IGMP Snooping function; This switch comprises monitors module and analog module: monitor module, be used to monitor the general group polling message of IGMP, after listening to the general group polling message of IGMP, send the IP address of the igmp querying device of the general group polling message of this IGMP at local record; In preset time T, do not listen to the general group polling message of said IGMP and then notify analog module; Analog module; Be used for after receiving the notice of monitoring module, simulating said igmp querying device and send the general group polling message of IGMP, wherein the source IP address of the general group polling message of IGMP of simulation transmission is the IP address of the said igmp querying device of monitoring module records.
Preferably, said monitoring module listens to behind the general group polling message of n IGMP that same igmp querying device sends in the IP address of the igmp querying device of the general group polling message of local record this IGMP of transmission continuously, and n is the natural number greater than 1.
Preferably; This switch also comprises the list item processing module; Be used for after the member relation report message of the adding multicast group of receiving the main frame feedback, parsing the multicast group address that main frame will add:, then create forwarding-table item if there is not the pairing forwarding-table item of this multicast group; Receiving port is added in the outbound port tabulation, and start ageing timer; If there has been the corresponding forwarding-table item of this multicast group, but do not comprise this receiving port in its outbound port tabulation, then this receiving port is added in the outbound port tabulation, and start ageing timer; If there has been the corresponding forwarding-table item of this multicast group, and comprise this receiving port in its outbound port tabulation, its ageing timer of then resetting, wherein ageing time is T1, and T1 is greater than said preset time T.
Preferably, said monitoring module is simulated at analog module and is listened to the general group polling message of IGMP again after said igmp querying device sends the general group polling message of IGMP, then with this result notification analog module that listens to; Said analog module is received to monitor when the said igmp querying device of simulation sends the general group polling message of IGMP and is no longer simulated said igmp querying device behind the result who listens to the general group polling message of IGMP that module sends and send the general group polling message of IGMP.
The present invention also provides a kind of method of Simulation with I GMP requestor; This method is applied to Layer 2 switch; This Layer 2 switch has IGMP Snooping function; This method may further comprise the steps: monitor the general group polling message of IGMP, after listening to the general group polling message of IGMP, send the IP address of the igmp querying device of the general group polling message of this IGMP at local record; The said igmp querying device of simulation sends the general group polling message of IGMP after in preset time T, listening to the general group polling message of said IGMP, and wherein the source IP address of the general group polling message of IGMP of simulation transmission is the IP address of said igmp querying device.
Preferably, listen to continuously behind the general group polling message of n IGMP that same igmp querying device sends in the IP address of the igmp querying device of the general group polling message of local record this IGMP of transmission, n is the natural number greater than 1.
Preferably; After the member relation report message of the adding multicast group of receiving the main frame feedback; Parse the multicast group address that main frame will add: if there is not the pairing forwarding-table item of this multicast group; Then create forwarding-table item, receiving port is added in the outbound port tabulation, and start ageing timer; If there has been the corresponding forwarding-table item of this multicast group, but do not comprise this receiving port in its outbound port tabulation, then this receiving port is added in the outbound port tabulation, and start ageing timer; If there has been the corresponding forwarding-table item of this multicast group, and comprise this receiving port in its outbound port tabulation, its ageing timer of then resetting, wherein ageing time is T1, and T1 is greater than said preset time T.
Preferably, after listening to the general group polling message of IGMP again behind the general group polling message of the said igmp querying device transmission IGMP of simulation, no longer simulate said igmp querying device and send the general group polling message of IGMP.
Beneficial effect of the present invention: technology implementation of the present invention is simple, does not relate to any process of thinking manual configuration, and easy user's operation does not have must exist on the switch restriction of management address simultaneously, has increased flexibility.
Description of drawings
Fig. 1 is the network diagram of the embodiment of the invention.
Fig. 2 is an embodiment of the invention device building-block of logic.
Fig. 3 is the another network diagram of the embodiment of the invention.
Fig. 4 is an embodiment of the invention flow chart.
Embodiment
Below in conjunction with Fig. 1～Fig. 3, specify embodiment of the present invention.Network as shown in Figure 1 comprises the Layer 2 switch 12 with IGMP Snooping function, and this switch 12 uplink ports connection one has the routing device of igmp querying device 11, and downlink port connects several host 13.This Layer 2 switch 12 also comprises and monitors module 120 and analog module 121, ginseng Fig. 2 except having general layer 2-switched packet forwarding module (not shown).This monitors module 120, is used to monitor the general group polling message of IGMP, after listening to the general group polling message of IGMP, sends the IP address of the igmp querying device of the general group polling message of this IGMP at local record; In preset time T, do not listen to the general group polling message of said IGMP, then this is not heard the result notification analog module of the general group polling message of IGMP; Analog module 121 is used for the general group polling message of the said igmp querying device transmission IGMP of simulation behind the result who receives the general group polling message of the said IGMP of not hearing, and the source IP address of this message is the IP address of said igmp querying device.
In the network of a startup IGMP agreement, the igmp querying device can periodically send the general group polling message of IGMP with the All hosts of multicast mode in local network segment.As shown in Figure 1; It is the general group polling message of multicast address 224.0.0.1 that igmp querying device 11 sends destination address; The monitoring module 120 of Layer 2 switch 12 listens to this query message, this query message is transmitted to its main frame that connects 13 makes main frame after receiving this query message, feed back the multicast group that oneself needs adds.Here, the monitoring module 120 of Layer 2 switch 12 is after listening to this query message, and also the source IP address with this query message is recorded in this locality, and this source IP address is the IP address of the igmp querying device 11 that sends query message.Because the periodic general group polling messages of IGMP that send of igmp querying device 11, thus at this requestor 11 normal and network just often, the monitoring module 120 of Layer 2 switch 12 will periodically listen to the general group polling message of its IGMP that sends.If the local source IP address that has recorded the general group polling message of the IGMP that listens to then follow-up no longer duplicate record.Can play a timer to the general group polling message of this IGMP; When the monitoring module 120 of Layer 2 switch 12 does not listen to the general group polling message of this IGMP in the T at the fixed time; Such as 2 cycles that requestor sends the general group polling message of IGMP, at this moment monitoring module 120 needs the analog module 121 of notice Layer 2 switch 12 oneself in this Preset Time, not listen to the general group polling message of IGMP that the igmp querying device sends.Analog module 121 is that source address Simulation with I GMP requestor 11 sends the general group polling message of IGMP in the address of the igmp querying device 11 of local record to monitor module 120.Main frame 13 in the network is handled the general group polling message of IGMP that Layer 2 switch 12 sends as the general group polling message of IGMP of receiving 11 transmissions of real igmp querying device: main frame 13 feedbacks add the member relation report message (IGMP Report) of certain multicast group, show the multicast group that self need add.For Layer 2 switch; Its list item processing module (not shown) is after the member relation report message of the adding multicast group of receiving the main frame feedback; Parse the multicast group address that main frame will add, and the receiving port of message is done following processing:, then create forwarding-table item if there is not the pairing forwarding-table item of this multicast group; This receiving port is added in the outbound port tabulation, and start ageing timer; If there has been the corresponding forwarding-table item of this multicast group, but do not comprise this port in its outbound port tabulation, then this port is added in the outbound port tabulation, and start ageing timer; If there has been the corresponding forwarding-table item of this multicast group, and comprise this port, its ageing timer of then resetting in its outbound port tabulation.Here suppose that ageing time is T1, for not interrupting of dependable flow, T1 is greater than preset time T.
Monitoring module listens to behind the general group polling message of IGMP that same igmp querying device sends in IP address that local record sends the igmp querying device of the general group polling message of this IGMP continuously.
In Fig. 3, router-A and router B are thinking it oneself is the igmp querying device when initial, so can send the general group polling message of IGMP to all main frames and router in local network segment, destination address is 224.0.0.1.Router-A and router B can receive the query message that the other side sends respectively, 12 query messages that can receive router-A and router B respectively of Layer 2 switch.Router-A and router B after receiving the query message that the other side sends compare the source IP address of this message and the IP address of own port, and the little router in IP address will become the igmp querying device.The router that becomes requestor will periodically send the general group polling message of IGMP.So Layer 2 switch is at the general group polling message that can receive that at first two requestors send in this example, back extended meeting will be received the general group polling message that same requestor sends.Only receive the query message that same requestor sends, the address of noting this requestor is just meaningful.Here can after receiving the identical general group polling message of n source address continuously, confirm that the person of sending of this message is real requestor, can be real requestor with the person of sending who confirms this message behind the general group polling message of receiving same source address in the Preset Time m continuously also.After having confirmed real requestor, just can its address be recorded in local.When Layer 2 switch needs Simulation with I GMP requestor, will work in this address.
Layer 2-switched monitoring module is simulated at analog module and is listened to the general group polling message of IGMP again after said igmp querying device sends the general group polling message of IGMP, then with this result notification analog module that listens to; Said analog module is received to monitor when the said igmp querying device of simulation sends the general group polling message of IGMP and is no longer simulated said igmp querying device behind the result who listens to the general group polling message of IGMP that module sends and send the general group polling message of IGMP.
It possibly be that fault has appearred in requestor itself or fault has appearred in network that layer 2-switched monitoring module is monitored less than the general group polling message of IGMP, after these faults are got rid of, monitors module and will can listen to this query message again.Monitor module and listen to the function that query message notice analog module is closed the general group polling message of its Simulation with I GMP requestor transmission IGMP.The general group polling message of not redispatching after analog module is notified.
With reference to figure 4, further describe a kind of method of Simulation with I GMP requestor.
Step 1, igmp querying device periodically send the general group polling message of IGMP.
After step 2, switch listen to the general group polling message of IGMP, send the IP address of the igmp querying device of this message at local record.
If in network construction, only there is an igmp querying device in the aware networks, that switch is after receiving the general group polling message of IGMP, and directly the source IP address with this message is recorded in this locality, and this source IP address is the IP address of igmp querying device.If several igmp querying devices are arranged in the uncertain network or know that clearly two or more igmp querying devices are arranged; N the identical general group polling message of IGMP then preferably receiving same igmp querying device transmission continuously is again in the IP address of local record igmp querying device, and n is the natural number greater than 1.Usually, the present invention more is applicable to the situation of single igmp querying device.
Step 3, switch are received the IGMP report message that main frame sends, and set up the multicast forwarding list item.
After main frame is received the general group polling message of IGMP, if self will add corresponding multicast group, then can respond IGMP report message, switch will be set up the multicast forwarding list item after listening to IGMP report message, and each bar list item all is provided with ageing time.
Step 4, igmp querying device fault, impotentia is sent the link failure between the general group polling message of IGMP or igmp querying device and the switch.
Step 5, switch do not listen to the general group polling message of IGMP at Preset Time, utilize IP address this igmp querying device of simulation of the igmp querying device of record to send the general group polling message of IGMP.
Because fault has appearred in the link that the igmp querying device has occurred between fault or igmp querying device and the switch, switch can't be received the general group polling message of IGMP at aforementioned fault duration of existence, and switch Simulation with I GMP requestor sends general group polling message.Here need explanation, want to guarantee not interrupting of flux of multicast, the preset here time is preferably less than multicast forwarding list item ageing time.
Step 6, the fault recovery of igmp querying device have the ability to send the link failure reparation between the general group polling message of IGMP or igmp querying device and the switch.
Step 7, switch listen to the general group polling message of IGMP again, and no longer Simulation with I GMP requestor sends general group polling message.
Switch listens to the general group polling message of IGMP again, there is no need then again that Simulation with I GMP requestor has sent general group polling message, otherwise main frame will be received the general group polling message of unnecessary IGMP, increases the burden of main frame.
In fact the order that might not have above-mentioned strictness between the above step can be adjusted according to obstructed situation.
Technology implementation of the present invention is simple, does not relate to the process of any artificial manual configuration, and easy user's operation does not have must exist on the switch restriction of management address simultaneously, has increased flexibility.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (8)
1. switch, this switch has IGMP Snooping function, it is characterized in that, and this switch comprises monitors module and analog module:
Monitor module, be used to monitor the general group polling message of IGMP, after listening to the general group polling message of IGMP, send the IP address of the igmp querying device of the general group polling message of this IGMP at local record; In preset time T, do not listen to the general group polling message of said IGMP and then notify analog module;
Analog module; Be used for after receiving the notice of monitoring module, simulating said igmp querying device and send the general group polling message of IGMP, wherein the source IP address of the general group polling message of IGMP of simulation transmission is the IP address of the said igmp querying device of monitoring module records.
2. switch as claimed in claim 1; It is characterized in that; Said monitoring module listens to behind the general group polling message of n IGMP that same igmp querying device sends in the IP address of the igmp querying device of the general group polling message of local record this IGMP of transmission continuously, and n is the natural number greater than 1.
3. switch as claimed in claim 1; It is characterized in that this switch also comprises the list item processing module, be used for after the member relation report message of the adding multicast group of receiving the main frame feedback; Parse the multicast group address that main frame will add: if there is not the pairing forwarding-table item of this multicast group; Then create forwarding-table item, receiving port is added in the outbound port tabulation, and start ageing timer; If there has been the corresponding forwarding-table item of this multicast group, but do not comprise this receiving port in its outbound port tabulation, then this receiving port is added in the outbound port tabulation, and start ageing timer; If there has been the corresponding forwarding-table item of this multicast group, and comprise this receiving port in its outbound port tabulation, its ageing timer of then resetting, wherein ageing time is T1, and T1 is greater than said preset time T.
4. according to claim 1 or claim 2 switch; It is characterized in that; Said monitoring module is simulated at analog module and is listened to the general group polling message of IGMP again after said igmp querying device sends the general group polling message of IGMP, then with this result notification analog module that listens to; Said analog module is received to monitor when the said igmp querying device of simulation sends the general group polling message of IGMP and is no longer simulated said igmp querying device behind the result who listens to the general group polling message of IGMP that module sends and send the general group polling message of IGMP.
5. the method for a Simulation with I GMP requestor, this method is applied to Layer 2 switch, and this Layer 2 switch has IGMP Snooping function, it is characterized in that, and this method may further comprise the steps:
Monitor the general group polling message of IGMP, after listening to the general group polling message of IGMP, send the IP address of the igmp querying device of the general group polling message of this IGMP at local record;
The said igmp querying device of simulation sends the general group polling message of IGMP after in preset time T, listening to the general group polling message of said IGMP, and wherein the source IP address of the general group polling message of IGMP of simulation transmission is the IP address of said igmp querying device.
6. method as claimed in claim 5; It is characterized in that; This method comprises, listens to continuously behind the general group polling message of n IGMP that same igmp querying device sends in the IP address of the igmp querying device of the general group polling message of local record this IGMP of transmission, and n is the natural number greater than 1.
7. method as claimed in claim 5; It is characterized in that; After the member relation report message of the adding multicast group of receiving the main frame feedback, parse the multicast group address that main frame will add:, then create forwarding-table item if there is not the pairing forwarding-table item of this multicast group; Receiving port is added in the outbound port tabulation, and start ageing timer; If there has been the corresponding forwarding-table item of this multicast group, but do not comprise this receiving port in its outbound port tabulation, then this receiving port is added in the outbound port tabulation, and start ageing timer; If there has been the corresponding forwarding-table item of this multicast group, and comprise this receiving port in its outbound port tabulation, its ageing timer of then resetting, wherein ageing time is T1, and T1 is greater than said preset time T.
8. like claim 5 or 6 described methods, it is characterized in that, after listening to the general group polling message of IGMP again behind the general group polling message of the said igmp querying device transmission IGMP of simulation, no longer simulate said igmp querying device and send the general group polling message of IGMP.
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