CN102752197B - A kind of method and interchanger for simulating igmp querying device - Google Patents
A kind of method and interchanger for simulating igmp querying device Download PDFInfo
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- CN102752197B CN102752197B CN201210211194.0A CN201210211194A CN102752197B CN 102752197 B CN102752197 B CN 102752197B CN 201210211194 A CN201210211194 A CN 201210211194A CN 102752197 B CN102752197 B CN 102752197B
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Abstract
The present invention provides a kind of interchanger, the interchanger has the function of IGMP Snooping, the interchanger includes: monitoring module, for monitoring the universal group polling message of IGMP, the IP address of the igmp querying device of the universal group polling message of the IGMP is sent in local record after listening to the universal group polling message of IGMP；The universal group polling message of the IGMP is not listened in preset time T then notifies analog module；Analog module sends the universal group polling message of IGMP for simulating the igmp querying device after receiving the notice for monitoring module, wherein the source IP address of the universal group polling message of the IGMP for simulating transmission is the IP address for monitoring the igmp querying device of module record.Corresponding to the interchanger, the present invention also provides a kind of methods for simulating igmp querying device.Technology of the invention is implemented simple, is not related to any process for thinking manual configuration, easy user's operation, while the limitation without there must be management address on interchanger, increases flexibility.
Description
Technical field
The present invention relates in network data communication multicasting technology more particularly to it is a kind of simulate igmp querying device method with
And interchanger.
Background technique
In existing multicast environment, igmp querying device (IGMP Querier) is generally deployed on convergence layer routing device,
After two layers of access device and convergence layer routing device physical link interrupt or after the failure of convergence layer routing device, it can lead
Cause the multicast forwarding list item on two layers of access device due to can not receive downstream host equipment and the report message of multicast group is added
Aging.Flux of multicast would not be introduced into the host equipment in downstream in this way.
When former solution is the configuration igmp querying device on Layer 2 switch, the address of user's given query device is
The management address of Layer 2 switch, the requestor participate in competing together with the requestor on convergence layer routing device, and victor fills
When igmp querying device.It usually can be by configuring so that igmp querying device is served as in the triumph of convergence layer routing device.In this way when two layers
After access device and convergence layer routing device physical link interrupt or after the failure of convergence layer routing device, two layers of access are set
It is standby to serve as igmp querying device automatically, send query message.
Although the above method can solve the problem of present physical link down or equipment fault, but this method is still deposited
In some problems: 1, management address is not necessarily present on Layer 2 switch, if it were to be so, the above method just loses understanding
The certainly basis of problem；It, be in each VLAN on two layers of access device if 2, having more VLAN on two layers of access device
All configuration querying devices, it is comparatively laborious in this way；3, since the address of the igmp querying device on Layer 2 switch is Layer 2 switch
Management address, and this management address is that user specifies, if it is 0.0.0.0, host subscriber's meeting of Windows
The query message is abandoned, this just loses meaning existing for requestor.
Summary of the invention
In view of this, the present invention provides a kind of interchanger, which has the function of IGMP Snooping, the interchanger
Including monitoring module and analog module: module is monitored, it is universal listening to IGMP for monitoring the universal group polling message of IGMP
The IP address of the igmp querying device of the universal group polling message of the IGMP is sent after group polling message in local record；In preset time
The universal group polling message of the IGMP is not listened in T then notifies analog module；Analog module, for receiving monitoring mould
The igmp querying device is simulated after the notice of block and sends the universal group polling message of IGMP, wherein simulating the IGMP of transmission, generally group is looked into
The source IP address for asking message is the IP address for monitoring the igmp querying device of module record.
Preferably, the module of monitoring continuously listens to the universal group polling of n IGMP that the same igmp querying device is sent
The IP address of the igmp querying device of the universal group polling message of the IGMP is sent after message in local record, n is the nature greater than 1
Number.
Preferably, which further includes list item processing module, for receiving certain multicast group of the addition of host feedback
After membership report's message, the host multicast group address to be added is parsed: turning if there is no corresponding to the multicast group
Forwarding list item then creates forwarding-table item, receiving port is added in exit port list, and start ageing timer；If deposited
In the corresponding forwarding-table item of the multicast group, but do not include the receiving port in its exit port list, then adds the receiving port
Into exit port list, and start ageing timer；If having existed the corresponding forwarding-table item of the multicast group, and its exit port
Include the receiving port in list, then reset its ageing timer, wherein ageing time is T1, and T1 is greater than the preset time
T。
Preferably, the monitoring module simulates the igmp querying device in analog module and sends the universal group polling message of IGMP
Listen to the universal group polling message of IGMP, then the result notice analog module listened to this again afterwards；The analog module is in mould
Intend receiving when the igmp querying device sends IGMP universal group polling message and monitors the IGMP that listens to that module is sent generally group is looked into
The igmp querying device transmission universal group polling message of IGMP is no longer simulated after asking the result of message.
The present invention also provides a kind of method for simulating igmp querying device, this method is applied to Layer 2 switch, this two layers friendship
Changing planes has the function of IGMP Snooping, method includes the following steps: monitoring the universal group polling message of IGMP, is listening to
The IP address of the igmp querying device of the universal group polling message of the IGMP is sent after the universal group polling message of IGMP in local record；?
The igmp querying device transmission IGMP generally group is simulated after not listening to the universal group polling message of the IGMP in preset time T
Query message, wherein the source IP address of the universal group polling message of the IGMP for simulating transmission is the IP address of the igmp querying device.
Preferably, it continuously listens to after the universal group polling message of n IGMP that the same igmp querying device is sent in local
Record sends the IP address of the igmp querying device of the universal group polling message of the IGMP, and n is the natural number greater than 1.
Preferably, it after the membership report's message for receiving certain multicast group of the addition of host feedback, parses host and wants
The multicast group address of addition: the forwarding-table item if there is no corresponding to the multicast group then creates forwarding-table item, by receiving port
It is added in exit port list, and starts ageing timer；If the corresponding forwarding-table item of the existing multicast group, but its outlet
Do not include the receiving port in mouth list, then the receiving port is added in exit port list, and start ageing timer；Such as
Fruit has existed the corresponding forwarding-table item of the multicast group, and includes the receiving port in its exit port list, then resets its aging
Timer, wherein ageing time is T1, and T1 is greater than the preset time T.
Preferably, IGMP generally group is listened to again after simulating the igmp querying device and sending the universal group polling message of IGMP
The igmp querying device is no longer simulated after query message sends the universal group polling message of IGMP.
Implement simply, not being related to any process for thinking manual configuration the invention has the advantages that: technology of the invention, it is easy
User's operation, while limitation without there must be management address on interchanger, increase flexibility.
Detailed description of the invention
Fig. 1 is the network diagram of the embodiment of the present invention.
Fig. 2 is the device of that embodiment of the invention building-block of logic.
Fig. 3 is the another network diagram of the embodiment of the present invention.
Fig. 4 is flow chart of the embodiment of the present invention.
Specific embodiment
Below in conjunction with FIG. 1 to FIG. 3, embodiment that the present invention will be described in detail.Network as shown in Figure 1, including with IGMP
The Layer 2 switch 12 of Snooping function, 12 uplink port of interchanger connection, one routing with igmp querying device 11 are set
Standby, downlink port connects several hosts 13.The Layer 2 switch 12 forwards mould in addition to the data packet with general Layer 2 switch
Block (not shown) outside, further includes monitoring module 120 and analog module 121, joins Fig. 2.The monitoring module 120, for monitoring IGMP
Universal group polling message sends the universal group polling message of the IGMP in local record after listening to the universal group polling message of IGMP
Igmp querying device IP address；The universal group polling message of the IGMP is not listened in preset time T, then is not supervised this
Hear the result notice analog module of the universal group polling message of IGMP；Analog module 121, for receiving described do not hear
The igmp querying device is simulated after the result of the universal group polling message of IGMP sends the universal group polling message of IGMP, the source of the message
IP address is the IP address of the igmp querying device.
In the network that one starts IGMP agreement, igmp querying device can be periodically in a manner of multicast to local network segment
Interior All hosts send the universal group polling message of IGMP.As shown in Figure 1, igmp querying device 11 sends destination address for multicast
The universal group polling message of location 224.0.0.1, the monitoring module 120 of Layer 2 switch 12 listen to the query message, this are looked into
Inquiry message is transmitted to the host 13 that it is connected and host is made to feed back the multicast that oneself needs to be added after receiving the query message
Group.Here, the monitoring module 120 of Layer 2 switch 12 is after listening to the query message, also by the source IP of the query message
Location is recorded in local, which is the IP address for sending the igmp querying device 11 of query message.Due to igmp querying device
11 periodically send the universal group polling messages of IGMP, so when and network normal in the requestor 11 is normal, Layer 2 switch
12 monitoring module 120 will periodically listen for the universal group polling message of IGMP of its sending.If local have been recorded with
The source IP address of the universal group polling message of the IGMP listened to is then subsequent to be not repeated to record.For the universal group polling report of the IGMP
Text can play a timer, when not listen to the IGMP in predetermined time T general for the monitoring module 120 of Layer 2 switch 12
All over group polling message, such as 2 requestors send the period of the universal group polling message of IGMP, at this moment monitor module 120 and need
The analog module 121 oneself of notice Layer 2 switch 12 does not listen to the IGMP of igmp querying device sending in the preset time
Universal group polling message.Analog module 121 is to monitor module 120 in the address of the igmp querying device 11 of local record as source address
It simulates igmp querying device 11 and sends the universal group polling message of IGMP.Host 13 in network is as receiving real igmp querying device 11
The universal group polling message of the IGMP of transmission equally handles the universal group polling message of IGMP of the sending of Layer 2 switch 12: host 13 is anti-
Membership report's message (IGMP Report) of certain multicast group is added in feedback, shows the multicast group for itself needing to be added.For two
Layer switch, list item processing module (not shown) is in the membership report's message for receiving certain multicast group of the addition of host feedback
Afterwards, the host multicast group address to be added is parsed, and following processing is done to the receiving port of message: if there is no the multicast
The corresponding forwarding-table item of group, then create forwarding-table item, which be added in exit port list, and it is fixed to start aging
When device；If the corresponding forwarding-table item of the existing multicast group, but do not include the port in its exit port list, then by the port
It is added in exit port list, and starts ageing timer；If having existed the corresponding forwarding-table item of the multicast group, and it goes out
Include the port in port list, then resets its ageing timer.It is assumed that ageing time is T1, in order to guarantee flow not
It interrupts, T1 is greater than preset time T.
Module is monitored continuously to listen to after the universal group polling message of IGMP that the same igmp querying device is sent in local note
Record sends the IP address of the igmp querying device of the universal group polling message of the IGMP.
In Fig. 3, router A and router B are thinking it oneself is igmp querying device at the beginning, so can be in local
Network segment sends the universal group polling message of IGMP to all hosts and router, and destination address is 224.0.0.1.Router A and
Router B will receive the query message of other side's transmission respectively, and Layer 2 switch 12 then will receive router A and router B respectively
Query message.After router A and router B receives the query message of other side's transmission, by the source IP address of the message and oneself
The IP address of port is compared, and the small router of IP address will become igmp querying device.Router as requestor will be all
The universal group polling message of the transmission IGMP of phase property.So Layer 2 switch will receive two inquiries at first in this example
The universal group polling message that device is sent, rear extended meeting will receive the universal group polling message of the same requestor transmission.Only receive
The query message that the same requestor is sent, the address for recording the requestor are just significant.It here can be a with n is continuously received
Determine that the sender of the message is real requestor, can also use preset time after the identical universal group polling message of source address
Determine that the sender of the message is real requestor after continuously receiving the universal group polling message of same source address in m.When true
Its address can be recorded in locally after having determined real requestor.When Layer 2 switch needs to simulate igmp querying device
When, which will work.
The monitoring module of Layer 2 switch simulates the igmp querying device in analog module and sends the universal group polling report of IGMP
The universal group polling message of IGMP, then the result notice analog module listened to this are listened to after text again；The analog module exists
Simulate received when the igmp querying device sends IGMP universal group polling message monitor that module sends listen to IGMP generally group
The igmp querying device is no longer simulated after the result of query message sends the universal group polling message of IGMP.
It may be that requestor itself occurs that the monitoring module of Layer 2 switch, which is monitored less than the universal group polling message of IGMP,
There is failure in failure or network, and after these troubleshootings, the query message can will be listened to again by monitoring module.It monitors
Module listens to query message notice analog module and closes its simulation igmp querying device transmission universal group polling message of IGMP
Function.Universal group polling message is not retransmited after analog module is notified.
With reference to Fig. 4, a kind of method for simulating igmp querying device is further described.
Step 1, igmp querying device periodically send the universal group polling message of IGMP.
After step 2, interchanger listen to the universal group polling message of IGMP, the igmp querying of the message is sent in local record
The IP address of device.
If, there is only an igmp querying device in aware networks, that interchanger is receiving when network construction
After the universal group polling message of IGMP, the source IP address of the message is directly recorded in local, which is igmp querying
The IP address of device.If have in uncertain network several igmp querying devices or clearly know there are two or two or more IGMP
Requestor then preferably continuously receives the n identical universal group polling messages of IGMP of the same igmp querying device transmission again at this
Ground records the IP address of igmp querying device, and n is the natural number greater than 1.Generally, the present invention is more suitable for single igmp querying device
The case where.
Step 3, interchanger receive the IGMP report message of host transmission, establish multicast forwarding list item.
After host receives the universal group polling message of IGMP, if corresponding multicast group will be added in itself, IGMP can be responded
Report message, interchanger will establish multicast forwarding list item after listening to IGMP report message, and each list item is both provided with
Ageing time.
Step 4, igmp querying device failure, impotentia send the universal group polling message of IGMP or igmp querying device and exchange
Link failure between machine.
Step 5, interchanger do not listen to the universal group polling message of IGMP in preset time, utilize the igmp querying of record
The IP address of device simulates the igmp querying device and sends the universal group polling message of IGMP.
There is failure since the link between failure or igmp querying device and interchanger occurs in igmp querying device, hands over
The universal group polling message of IGMP can not be received in aforementioned failure duration of existence by changing planes, and interchanger is simulated igmp querying device and sent generally
Group polling message.It needs exist for illustrating, to guarantee not interrupting for flux of multicast, the time here preset at is more preferably less than multicast and turns
Forwarding list item ageing time.
Step 6, igmp querying device fault recovery have the ability to send the universal group polling message of IGMP or igmp querying device and
Link failure reparation between interchanger.
Step 7, interchanger listen to the universal group polling message of IGMP again, and no longer simulation igmp querying device sends generally group and looks into
Ask message.
Interchanger listens to the universal group polling message of IGMP again, then It is not necessary to which simulating igmp querying device again sends generally group
Query message, otherwise host will receive the universal group polling message of extra IGMP, increase the burden of host.
There might not be above-mentioned stringent sequence between above step, can actually be adjusted according to obstructed situation
It is whole.
Technology of the invention is implemented simple, is not related to the process of any artificial manual configuration, easy user's operation, simultaneously
There is no there must be the limitation of management address on interchanger, increases flexibility.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (8)
1. a kind of interchanger, which has the function of IGMP Snooping, which is characterized in that the interchanger includes monitoring mould
Block and analog module:
Module is monitored, for monitoring the universal group polling message of IGMP, in local note after listening to the universal group polling message of IGMP
Record sends the IP address of the igmp querying device of the universal group polling message of the IGMP；It is not listened in preset time T described
The universal group polling message of IGMP then notifies analog module；
Analog module sends the universal group polling of IGMP for simulating the igmp querying device after receiving the notice for monitoring module
Message, wherein the source IP address of the universal group polling message of the IGMP for simulating transmission is the igmp querying device for monitoring module record
IP address.
2. interchanger as described in claim 1, which is characterized in that the monitoring module continuously listens to the same igmp querying
The igmp querying device of the universal group polling message of the IGMP is sent after the universal group polling message of n IGMP that device is sent in local record
IP address, n is natural number greater than 1.
3. interchanger as described in claim 1, which is characterized in that the interchanger further includes list item processing module, for receiving
To after membership report's message of certain multicast group of the addition of host feedback, the host multicast group address to be added is parsed: such as
Fruit then creates forwarding-table item, receiving port is added in exit port list there is no forwarding-table item corresponding to the multicast group,
And start ageing timer；If the corresponding forwarding-table item of the existing multicast group, but connect in its exit port list not comprising this
The receiving port is then added in exit port list, and starts ageing timer by receiving end mouth；If having existed the multicast group
Corresponding forwarding-table item, and include the receiving port in its exit port list, then its ageing timer is reset, wherein ageing time
For T1, and T1 is greater than the preset time T.
4. interchanger as claimed in claim 1 or 2, which is characterized in that described in the monitoring module is simulated in analog module
Igmp querying device listens to the universal group polling message of IGMP, the then knot listened to this after sending the universal group polling message of IGMP again
Fruit notifies analog module；The analog module receives prison in the universal group polling message of the simulation igmp querying device transmission IGMP
It is general that the igmp querying device transmission IGMP is no longer simulated after the result for listening to the universal group polling message of IGMP for listening module to send
All over group polling message.
5. a kind of method for simulating igmp querying device, this method is applied to Layer 2 switch, which has IGMP
Snooping function, which is characterized in that method includes the following steps:
The universal group polling message of IGMP is monitored, the IGMP is general in local record transmission after listening to the universal group polling message of IGMP
All over the IP address of the igmp querying device of group polling message；
The igmp querying device transmission IGMP is simulated after not listening to the universal group polling message of the IGMP in preset time T
Universal group polling message, wherein the source IP address of the universal group polling message of the IGMP for simulating transmission is the IP of the igmp querying device
Address.
6. method as claimed in claim 5, which is characterized in that this method includes continuously listening to the same igmp querying device
The igmp querying device of the universal group polling message of the IGMP is sent after the universal group polling message of n IGMP of transmission in local record
IP address, n are the natural number greater than 1.
7. method as claimed in claim 5, which is characterized in that in the member relation for receiving certain multicast group of the addition of host feedback
After report message, the host multicast group address to be added: the forwarding-table item if there is no corresponding to the multicast group is parsed, then
Forwarding-table item is created, receiving port is added in exit port list, and start ageing timer；If the existing multicast group
Corresponding forwarding-table item, but do not include the receiving port in its exit port list, then the receiving port is added to exit port column
In table, and start ageing timer；If having existed the corresponding forwarding-table item of the multicast group, and include in its exit port list
The receiving port then resets its ageing timer, and wherein ageing time is T1, and T1 is greater than the preset time T.
8. such as method described in claim 5 or 6, which is characterized in that send IGMP generally group simulating the igmp querying device
It is listened to again after query message and no longer simulates the igmp querying device after the universal group polling message of IGMP and send IGMP generally group is looked into
Ask message.
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