CN100544302C - Polymerizing method for two layer multicast virtual local area network and convergence switch thereof - Google Patents
Polymerizing method for two layer multicast virtual local area network and convergence switch thereof Download PDFInfo
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Abstract
Polymerizing method for two layer multicast virtual local area network and convergence switch thereof.Message processing rule with the corresponding network side VLAN multicast message of a plurality of user side VLAN multicast messages is set, and user side VLAN receiving group message is handled the back according to the message processing rule and is sent to the upstream switching equipment by network side VLAN; Network side VLAN receiving group message is handled the back according to the message processing rule and is sent to user side by user side VLAN.By monitoring the IGMP message, multicast forward table is set up and safeguarded to convergence switch, and convergence switch is transmitted the multicast message that the upstream switching equipment issues according to multicast forward table.The two layer multicast virtual local area network convergence switch comprises the ether processing module and drives processing module, can also comprise the multicast protocol processing module.The present invention has realized not enabling IGMP and multicast routing protocol, carries out the multicast packet travelling across VLAN and transmit under the L2 configuration.
Description
Technical field
The present invention relates to the computer network communication technology field, relate to polymerizing method for two layer multicast virtual local area network and convergence switch thereof more specifically.
Background technology
Growing along with network technology is because the realization of multicasting technology has improved message forwarding efficient in the network greatly, so obtained using very widely in network service.Simultaneously, broadband IP network begins to take shape through in a few years construction, and the network infrastructure of high bandwidth and a large amount of users have been arranged.The IP multicasting technology has been realized the efficient data transmission of IP network mid point to multiple spot.Because multicast is conserve network bandwidth, reduction offered load effectively, so all be widely used in all many-sides such as real time data transmission, multimedia conferencing, data copy, recreation and emulation.Can utilize the multicast feature of network that some new value-added services are provided easily, comprise the information service field of the Internets such as online live, Web TV, long-distance education, tele-medicine, network radio station, real-time video meeting.In addition in present broadband network communication, often need be in VLAN (VLAN, Virtual Local Area Network) inside or cross-VLAN developing multicast business.
The networking of existing broadband network is combined in the function of finishing in the network service and can be divided into three layers of (layer3 according to the network equipment itself and the network equipment, L3) network portion and two layers of (layer2, L2) network portion, the a certain concrete network equipment also can comprise three-layer network part and double layer network part, its double layer network partly is mainly used in directly and links to each other with user side, then mainly as the part of Internet or other three-layer networks, the multicast source that sends multicast service in the network is usually located in the three-layer network three-layer network.
Fig. 1 is two layers of networking schematic diagram of prior art, in two layers of networking, has a plurality of subscriber's main stations to insert different VLAN, and each VLAN is transparent to gateway device such as terminating on L3 switch or the router by L2 access switch and convergence switch respectively.In the network service process, double layer network can't be realized the transmission of multicast message between different VLAN, the IP network sector address that each VLAN of common double layer network is corresponding different respectively, so realize between different VLAN that multicast can carry out duplicating of multicast message by three-layer network, and the message after will duplicating sends in different VLAN, be three-layer network with double layer network between the connectivity port just need simultaneously the message transmission content identical but the different multicast message of VLAN ID (VLAN ID) has caused waste of network resources.
Multicast protocol is divided into the agreement between main frame-router, i.e. multicast member management protocol, and agreement between the router-Router mainly is various Routing Protocols.The group membership concerns that agreement comprises IGMP (Internet igmpinternet); Multicast routing protocol comprises agreements such as PIM (Protocol IndependentMulticast Protocol Independent Multicast)-SM, PIM-DM, DVMRP in the territory.In order effectively to suppress the diffusion of multicast packet in double layer network, Layer 2 Multicast agreements such as IGMP Snooping have been introduced simultaneously.
By IGMP and Layer 2 Multicast agreement, in router and switch, set up the group membership's relation information in the direct connection network segment.Specifically, be exactly the member which multicast group is arranged under which interface.IGMPSnooping (Internet Group Management Protocol Snooping) is the multicast tied mechanism that operates on the layer 2 ethernet switch, is used for management and control multicast group.
When layer 2 ethernet switch is received the IGMP message that transmits between main frame and the router, IGMPSnooping analyze the IGMP message with information.When listening to the igmp host report message (IGMP host report message) that main frame sends, switch just will join in the corresponding multicast table with this main frame; When listening to IGMP that main frame sends when withdrawing from message (IGMP Leave message), switch just will be deleted the multicast list corresponding with this main frame.When system does not move IGMP Snooping, multicast message will be broadcasted in the L2 scope.
IGMP Report message is sent in Sub-VLAN by user terminal, and process L2 access switch and convergence switch are transparent to the router of L3 switching equipment, and corresponding multicast forwarding list item is set up and safeguarded to the router of L3 switching equipment at L3.The same with the Report message, process L2 access switch and convergence switch are transparent to the router of L3 switching equipment, and corresponding multicast forwarding list item is safeguarded or deleted to the router of L3 switching equipment at L3.By L3 multicast mode, different user vlans is played different L3 interfaces, utilize the multicast forwarding list item to carry out the L3 multicast forwarding by IGMP and PIM agreement.
In the networking of prior art, the VLAN that the user inserts needs to be transparent on the gateway L3 switching equipment and terminates, when the VLAN number of user's access is more, need on the L3 switching equipment, carry out a large amount of VLAN terminations, each VLAN needs to consume the routing interface resource of a L3 switching equipment, handle for the L3 switching equipment and caused bigger pressure, simultaneously when following a plurality of users add same multicast group, it is descending to have the identical multicast data flow of multichannel in convergence-level, has wasted valuable bandwidth resources.In addition, on L3 equipment, need to carry out the configuration of user vlan interface and IP address, increased configuration complexity.
Summary of the invention
At problems of the prior art, of the present inventionly provide a kind of polymerizing method for two layer multicast virtual local area network, the present invention also provides a kind of two layer multicast virtual local area network convergence switch, do not enable under the situation of IGMP and multicast routing protocol to reach at L2, under the L2 configuration, carry out the multicast traffic stream travelling across VLAN and transmit, reach the purpose of saving broadband resource.
In order to achieve the above object, polymerizing method for two layer multicast virtual local area network of the present invention, technical scheme is realized by following mode, and the message processing rule with the corresponding network side VLAN multicast message of a plurality of user side VLAN multicast messages is set, and
The multicast message up direction by described user side VLAN receiving group message, is handled the back according to described message processing rule and is sent to the upstream switching equipment by described network side VLAN;
The multicast message down direction by described network side VLAN receiving group message, is handled the back according to described message processing rule and is sent to user side by described user side VLAN.
Polymerizing method for two layer multicast virtual local area network of the present invention, described network side VLAN are a M-VLAN that is exclusively used in the bear multicast message of network side configuration, and described multicast message comprises multicast data message and multicast protocol message.
Polymerizing method for two layer multicast virtual local area network of the present invention, the Sub-VLAN with user side VLAN is configured to M-VLAN is configured in each subscriber's main station in the different Sub-VLAN.
Polymerizing method for two layer multicast virtual local area network of the present invention, foundation and maintenance are used for determining the multicast forward table of Sub-VLAN and multicast group corresponding relation in M-VLAN, described multicast forward table is set up a multicast forwarding list item for each multicast group;
After M-VLAN is received the IGMP Report message of user side, the VLAN ID of this message is joined in the multicast forwarding list item of this multicast group, after M-VLAN is received the IGMP Leave message of user side, the VLAN ID of this message is deleted from the multicast forwarding list item of this multicast group;
According to described multicast forwarding list item, the multicast traffic stream in the M-VLAN copied in corresponding user's Sub-VLAN transmit.
Polymerizing method for two layer multicast virtual local area network of the present invention, by operation IGMP Snooping agreement, monitoring users main frame IGMP protocol massages, described message processing rule is:
For in Sub-VLAN, send IGMP Report message by user side, first user side VLAN ID that adds the IGMP Report message of this multicast group is replaced with the VLAN ID of M-VLAN, forward to and be transmitted to the upstream switching equipment in the M-VLAN, suppress the report message of follow-up this multicast group of adding;
Inhibition is sent IGMP Leave message by user side in Sub-VLAN, the VLAN ID with last user side VLAN ID that withdraws from the IGMP Leave message of this multicast group replaces with M-VLAN forwards to and upwards is transmitted to the upstream switching equipment in the M-VLAN.
Polymerizing method for two layer multicast virtual local area network of the present invention, set the time interval of a sustainable batch processing of user side, at the multicast message up direction, focus on the multicast message that in the described time interval, receives according to described message processing rule, and the message after will handling is sent to the upstream switching equipment by described network side VLAN by described user side VLAN.
Two layer multicast virtual local area network convergence switch of the present invention, technical scheme are realized by following mode, and the message processing rule with the corresponding network side VLAN multicast message of a plurality of user side VLAN multicast messages is set on the described convergence switch, and
Multicast message up direction, described convergence switch are handled the back according to described message processing rule and are sent to the upstream switching equipment by described network side VLAN by described user side VLAN receiving group message;
Multicast message down direction, described convergence switch are handled the back according to described message processing rule and are sent to user side by described user side VLAN by described network side VLAN receiving group message;
Two layer multicast virtual local area network convergence switch of the present invention, described network side VLAN is a M-VLAN that is exclusively used in the bear multicast message of convergence switch network side configuration, described multicast message comprises multicast data message and multicast protocol message; User side VLAN is configured to the Sub-VLAN of M-VLAN, and each user side is configured in the different Sub-VLAN.
Described convergence switch comprises: ether processing module and driving processing module, wherein:
Described ether processing module is used to be provided with described message processing rule, and handles the multicast message that described driving processing module is imported according to described message processing rule, and the multicast message after handling is outputed to described driving processing module;
Described driving processing module receives the multicast message that multicast message that user side sends by user side VLAN and upstream switching equipment issue by network side VLAN, with described multicast message input ether processing module; Transmit the multicast message of described ether processing module output.
Two layer multicast virtual local area network convergence switch of the present invention, described convergence switch also comprises the multicast protocol processing module, described multicast protocol processing module can be obtained the VLAN ID of multicast message, foundation and maintenance are used for determining the multicast forward table of user side and multicast group corresponding relation in described multicast protocol processing module, and described multicast forward table is set up a multicast forwarding list item for each multicast group;
Described multicast protocol processing module joins the VLAN ID that joins message in the multicast forwarding list item of its multicast group; The VLAN ID that withdraws from message is deleted from the multicast forwarding list item of its multicast group;
After described driving processing module is received the multicast protocol message of user side, send described message to described multicast protocol processing module by the ether processing module.
Described driving processing module, the multicast forwarding list item according to described multicast protocol processing module issues copies to the multicast traffic stream in the M-VLAN in the Sub-VLAN of this multicast group of program request.
Two layer multicast virtual local area network convergence switch of the present invention passes through operation IGMP Snooping agreement on the described convergence switch, monitoring users main frame IGMP protocol massages, and described message processing rule is:
For in Sub-VLAN, send IGMP Report message by user side, the VLAN ID that after described multicast protocol processing module is received first is added the IGMP Report message of this multicast group replaces with the VLAN ID of M-VLAN, output to described driving processing module and be transmitted to the upstream switching equipment, the IGMP Report message of follow-up this multicast group of adding will be suppressed by described multicast protocol processing module;
For in Sub-VLAN, send IGMP Leave message by user side, the VLAN ID that only last is withdrawed from the IGMP Leave message of this multicast group after described multicast protocol processing module is received replaces with the VLAN ID of M-VLAN, output to described driving processing module and be transmitted to the upstream switching equipment, the IGMP Leave message that before withdraws from this multicast group will be suppressed by described multicast protocol processing module.
After enabling the two layer multicast virtual local area network polymerization on the convergence switch of the present invention, up direction can converge to the multicast protocol message that belongs to the some broadcasting user of different Sub-VLAN in the M-VLAN, has reduced the quantity consumed of upstream L3 equipment VLAN routing interface; And also transport multicast stream in M-VLAN only of L3 equipment down direction is finished M-VLAN by convergence switch to transmit to the multicast replication user vlan, has effectively saved bandwidth resources.
Technical scheme provided by the invention can solve the VLAN aggregation problem in the double layer network multicast application, this scheme is low to inserting switch request, multicast replication is directly carried out at user vlan, and access switch only needs the supported vlans division to get final product, and does not need access switch to support multicast feature.
The present invention utilizes the multicast forwarding list item of L3 to realize the multicast forwarding of travelling across VLAN, but convergence switch remains as the L2 switch and use, and neither plays the L3 interface, and the IGMP protocol massages does not terminate yet.
Polymerizing method for two layer multicast virtual local area network of the present invention and convergence switch thereof, configuration is simple, and ease for use is strong.Do not need to realize the multicast forwarding of travelling across VLAN, simplified configuration and saved the IP address by configuration L3 interface.More flexible with the upstream equipment intercommunication, there is not the problem that cooperates between multicast routing protocol, convergence switch can support Layer 2 Multicast agreement IGMP-snooping to get final product.
Low to the switch request below the convergence switch, only need its supported vlans to divide and get final product, do not need it to support multicast features such as IGMP-SNOOPING.
Description of drawings
Fig. 1 is the schematic diagram of two layer multicast virtual local area network in the prior art;
Fig. 2 is the schematic diagram of realization polymerizing method for two layer multicast virtual local area network of the present invention and convergence switch thereof;
Fig. 3 is the up multicast message handling process schematic diagram of two layer multicast virtual local area network convergence switch of the present invention;
Fig. 4 is the networking structure figure of the IPTV of embodiment of the invention operator multicast application.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the specific embodiment of the invention is described in detail below in conjunction with accompanying drawing.
Fig. 2 is the schematic diagram of realization polymerizing method for two layer multicast virtual local area network of the present invention and convergence switch thereof, as shown in Figure 2, the networking structure of polymerizing method for two layer multicast virtual local area network of the present invention comprises program request user side, convergence switch and L3 gateway device, the multicast protocol message that the program request user side sends, through converging of convergence switch, concentrate with the L3 gateway device and carry out message interaction.
In this manual, described user side VLAN is meant the VLAN that user side directly inserts, and network side VLAN is meant the VLAN between convergence switch and the upstream switching equipment.Described up direction is meant multicast message by the message transmissions direction of user side to gateway device, and described down direction is meant that multicast message is by the message transmissions direction of L3 gateway device to user side.Described multicast message comprises multicast data message and multicast protocol message.Described some broadcasting user is meant and adds certain multicast group, promptly receive the user side of certain multicast source multicast packet.Described multicast message of the same type is meant and is all IGMP Report message or is all the IGMPLeave message.
Convergence switch is preferably layer 2 ethernet switch described in the two layer multicast virtual local area network convergence switch of the present invention, gateway device is preferably router or L3 switch, below with layer 2 ethernet switch as convergence switch, router illustrates two layer multicast virtual local area network polymerization of the present invention and convergence switch thereof as the L3 gateway device.
As shown in Figure 2, a message processing rule is set on convergence switch, this message processing rule corresponds to the multicast message of a network side with the multicast message of a plurality of user sides, also the multicast message of a network side is corresponded to the multicast message of a plurality of user sides simultaneously.Here the corresponding relation of mentioning, can be for being this destination address multicast protocol message of the same type that the multicast protocol message of the same type of being sent by subscriber's main station of same multicast group corresponds to a network side with a plurality of destination addresses, the multicast data message of a certain multicast group that router is issued corresponds to the multicast data message of this multicast group that mails to a plurality of Sub-VLAN of user side simultaneously.Convergence switch will be handled message according to such message processing rule, and at up direction, convergence switch receives the multicast message that subscriber's main station is sent by user side VLAN, and the multicast message after will handling by described network side VLAN is sent to router; At down direction, convergence switch is surveyed VLAN receiving group message by described network, by described user side VLAN multicast message is duplicated and is forwarded to each corresponding Sub-VLAN.
Furthermore, corresponding relation in the message processing rule can also be this destination address the type multicast protocol message that the multicast protocol message of the same type of same multicast group corresponds to a network side for all destination addresses in the certain hour that will be sent by subscriber's main station, and the multicast data message of a certain multicast group that router in the certain hour is issued corresponds to the multicast data message that all contain this multicast group of each Sub-VLAN of user side that mails to of user side simultaneously.
As shown in Figure 2, can dispose a multicast dedicated vlan on convergence switch, be used for the multicast traffic stream in bear multicast source, multicast traffic stream comprises multicast data message and multicast protocol message.This M-VLAN is designated M-VLAN ID.
Can also be with the descending VLAN of convergence switch, promptly user side VLAN is configured to the Sub-VLAN of M-VLAN, and each some broadcasting user of multicast source is in different Sub-VLAN.As shown in Figure 2, be divided into VLAN1, VLAN2, VLAN3 and VLAN4, they be configured to the Sub-VLAN of M-VLAN at user side.
Double layer network as shown in Figure 2, the mode of preferably duplicating the multicast data forwarding message is by operation IGMP Snooping agreement on convergence switch, by monitoring users end IGMP protocol massages, the multicast forward table of foundation and maintenance carries out the forwarding of data message in M-VLAN.
The multicast packet of multicast source is stored in the multimedia server that router connects, and upper layer network is set up a multicast group for each multicast source, this multicast group be designated multicast ID.There is the user of program request demand then to send the multicast protocol message IGMP Report that adds this multicast group, the information of the VLAN ID that carries the affiliated VLAN of this user side of this multicast protocol message, the destination address of this multicast protocol message is multicast ID.
Listen to this user side IGMP multicast protocol message on the convergence switch, will handle this message according to the multicast protocol message processing rule of prior setting.Monitoring multicast message can realize by operation IGMP Snooping agreement on the double layer network, also can realize by other agreement or application programs that can reach same purpose.
Specifically, for networking structure shown in Figure 2, polymerizing method for two layer multicast virtual local area network of the present invention, operation IGMP Snooping agreement on the convergence switch, the processing rule to the IGMP protocol massages when monitoring main frame IGMP protocol massages is:
(1) IGMP Report message is sent in Sub-VLAN by a broadcasting user, after convergence switch is received, first user side VLAN ID that adds this multicast group is replaced with the VLAN ID of M-VLAN, pass through the router of upstream, and in M-VLAN, set up the multicast forwarding list item of this multicast group; The IGMP Report message of follow-up this multicast group of adding will be suppressed, and safeguard corresponding multicast forwarding list item, and the VLAN ID that is about to this user's affiliated Sub-VLAN adds in the corresponding multicast forwarding list item.
(2) IGMP Leave message is sent in Sub-VLAN by a broadcasting user, after convergence switch is received, suppress this IGMP Leave message and safeguard corresponding multicast forwarding list item, when receiving last IGMP Leave message that withdraws from this multicast group, delete this multicast forwarding list item, and this message forwarded in the M-VLAN, the user vlan ID of IGMP Leave message is replaced with the VLAN ID of M-VLAN and to this IGMP Leave message of router transparent transmission.
First is meant described in this specification initially or is not temporarily having under the program request state of user, and first of arrival joins message; Described last withdraw from be meant that this broadcasting user withdraws from after, this multicast group is temporary transient or permanent is in no program request state of user.
For networking structure shown in Figure 2, polymerizing method for two layer multicast virtual local area network of the present invention, to the general query message, convergence switch is transmitted in the Sub-VLAN that a broadcasting user is arranged according to multicast forward table, and the group-specific query message is then abandoned.Because the last escape mechanism of IGMP Leave makes the group-specific query message receive response never, need not transmit the group-specific query message again.
For IGMP Report message, set message processing rule is equivalent to the IGMP Report message for same multicast group is corresponded to an IGMP Report message, and the VLAN ID of the source address of this IGMP Report message is the VLAN ID of M-VLAN.And for IGMP Leave message, set message processing rule is equivalent to the IGMP Leave message for same multicast group is corresponded to an IGMP Leave message, and the VLAN ID of the source address of this IGMP Leave message is the VLAN ID of M-VLAN.For multicast data message, the message processing rule is equivalent to a multicast data message of certain multicast group is corresponded to the multicast data message of being issued each Sub-VLAN that contains user side by M-VLAN.
Simultaneously, for a very large network of program request customer volume, may in an extremely short time, just have a large number of users adding or withdraw from certain multicast group.Can consider to set such multicast protocol message processing rule in the certain applications, set the time interval of the sustainable batch processing of a some broadcasting user, for example 1/10 second.In this time interval, after convergence switch receives first IGMPReport message, do not upload to router at once, but after the time interval of setting the by the time arrival, if do not receive the IGMP Leave message of this broadcasting user, just upwards transmit this IGMP Report message; In like manner, after last member of multicast group sends IGMP Leave message, do not upload to router equally at once, but after the time interval of setting the by the time arrival, if do not receive the IGMP Report message of any some broadcasting user, just upwards transmit this IGMP Leave message.
Router is received the multicast data message that then issues corresponding multicast group behind the IGMP Report message to M-VLAN.The multicast data message that issues will copy to each Sub-VLAN according to relevant multicast forwarding list item by convergence switch.Router is received the multicast data message that then stops to issue to M-VLAN corresponding multicast group behind the IGMP Leave message.
For double layer network shown in Figure 2, the multicast forward table of setting up and safeguarding, this data forwarding table is set up a data forwarding-table item for each multicast group.
If the multicast forwarding list item of certain multicast group is empty, then represent the current broadcasting user of not putting of this multicast group.
For double layer network shown in Figure 2, the step that the multicast packet of M-VLAN down direction duplicates forwarding is: convergence switch is according to the multicast forwarding list item, determine to contain the VLANID of each Sub-VLAN of a broadcasting user, the M-VLAN head is replaced with the Sub-VLAN head, it is duplicated be transmitted to Sub-VLAN, be forwarded to subscriber's main station by Sub-VLAN again.
In the networking structure as shown in Figure 2, the user side of convergence switch can be provided with the access switch that supported vlans is divided.
In the networking structure as shown in Figure 2, realize polymerizing method for two layer multicast virtual local area network of the present invention, described message suppresses mechanism by judging that whether the message that received is that first of a certain multicast group joins message or last withdraws from message and realizes.If that receives joins message to first joins message, then to this message of router transparent transmission; Not that first joins message if this joins message, then suppress this message.If the message of receiving that withdraws from withdraws from message for last, then to this message of router transparent transmission; If this withdraws from message is not that last withdraws from message, then suppress this message.
Described message suppresses mechanism also can be realized by the multicast forwarding list item that judges whether this multicast group.For joining message, if the multicast forwarding list item of this multicast group is empty in the multicast forward table, the multicast forwarding list item that then the VLAN ID of this message is added this multicast group joins message accordingly to the router transparent transmission simultaneously, and the user who suppresses follow-up this multicast group of adding joins message.For withdrawing from message, the VLAN ID of this message is deleted from the multicast forwarding list item of this multicast group, if the multicast forwarding list item of this multicast group is empty, then withdraw from message accordingly to the router transparent transmission.
In networking shown in Figure 2, in order to realize the two layer multicast virtual local area network polymerization, do not setting up on the convergence switch and safeguarding under the situation of multicast forward table, can use the mode of broadcasting directly to send multicast data message to user side.Form transmission multicast data message with broadcasting then can cause the huge wasting of resources.
Fig. 3 is the up multicast message handling process schematic diagram of two layer multicast virtual local area network convergence switch of the present invention;
As shown in Figure 3, convergence switch of the present invention comprises: ether processing module and driving processing module, wherein
The ether processing module is used to be provided with the message processing rule, and handles the multicast message that drives the processing module input according to the message processing rule, and the multicast message after handling is outputed to described driving processing module;
Drive processing module, receive user side and send the multicast message that issues by network side VLAN, multicast message is imported the ether processing module by multicast message and the upstream switches that user side VLAN sends; Transmit the multicast message of ether processing module output.
As shown in Figure 3, two layer multicast virtual local area network convergence switch of the present invention, message processing rule set in the ether processing module is: the type message that the multicast message of the same type of a plurality of same purpose multicast group of user side is corresponded to this multicast group of network side; The multicast message of a certain multicast group of network side is corresponded to the multicast message of a plurality of these multicast group of user side.For example joining message of a plurality of certain multicast group corresponded to joining message of this multicast group.The ether processing module can comprise a rule and submodule user setting is set and preserve the message processing rule.
Two layer multicast virtual local area network convergence switch of the present invention, described network side VLAN is a M-VLAN that is exclusively used in the bear multicast message of convergence switch network side configuration, described multicast message comprises multicast data message and multicast protocol message; Convergence switch user side VLAN is configured to the Sub-VLAN of M-VLAN, and each user side is configured in the different Sub-VLAN.Drive processing module the configuration management that the configuration management submodule is realized the Sub-VLAN of M-VLAN and M-VLAN is set.
As shown in Figure 3, two layer multicast virtual local area network convergence switch of the present invention also comprises the multicast protocol processing module, the multicast protocol processing module can be obtained the VLAN ID of multicast message, foundation and maintenance are used for determining the multicast forward table of user side and multicast group corresponding relation in the multicast protocol processing module, and multicast forward table is set up a multicast forwarding list item for each multicast group;
After the driving processing module is received the multicast protocol message of user side, can send this message to the multicast protocol processing module by the ether processing module.
The multicast protocol processing module joins this VLAN ID that joins message in the multicast forwarding list item of its multicast group; The VLAN ID that withdraws from message is deleted from the multicast forwarding list item of its multicast group;
For the multicast traffic stream that router issues by M-VLAN, drive processing module according to the multicast forwarding list item that the multicast protocol processing module issues, the multicast traffic stream in the M-VLAN is duplicated in the Sub-VLAN that is forwarded to this multicast group of program request.
As shown in Figure 3, two layer multicast virtual local area network convergence switch of the present invention, the multicast protocol processing module is provided with the monitoring submodule, agreement operation submodule operation IGMP Snooping agreement, monitor submodule monitoring users main frame IGMP protocol massages, the mode of convergence switch processing this moment message is:
For in Sub-VLAN, send IGMP Report message by user side, the VLAN ID that after the multicast protocol processing module is received first is added the IGMP Report message of this multicast group replaces with the VLAN ID of M-VLAN, output to the forwarding of driving processing module and be transmitted to the upstream switching equipment by driving processing module, the IGMP Report message of follow-up this multicast group of adding will be suppressed by the multicast protocol processing module;
For in Sub-VLAN, send IGMP Leave message by user side, the VLAN ID that only last is withdrawed from the IGMP Leave message of this multicast group after the multicast protocol processing module is received replaces with the VLAN ID of M-VLAN, output to the driving processing module and be transmitted to the upstream switching equipment, the IGMP Report message of follow-up this multicast group of adding will be suppressed by the multicast protocol processing module.
Simultaneously, for a very large network of program request customer volume, may in an extremely short time, just have a large number of users adding or withdraw from certain multicast group.Can consider in the multicast protocol processing module, to be provided with a timer in the certain applications, set the time interval of the sustainable batch processing of a some broadcasting user, for example 1/10 second.At first, with the timer initialization, in this time interval, after the driving processing module receives first IGMP Report message, it is delivered to the multicast protocol processing module by the ether processing module, this moment, the multicast protocol processing module was not handled at once, but after the response time of the timer arrival by the time, if the multicast protocol processing module is not received the IGMPLeave message of this broadcasting user, just the driving processing module is handled and outputed to this IGMP Report message, upload to router by driving processing module; In like manner, after last member of multicast group sends IGMP Leave message, the multicast protocol processing module is not handled this message at once, but after the response time of the timer arrival by the time, if do not receive the IGMP Report message of any some broadcasting user, just this message is handled and outputed to the driving processing module, to this IGMP Leave message of router transparent transmission.
Router is received the multicast data message that then issues corresponding multicast group behind the IGMP Report message to M-VLAN.The multicast data message that issues will copy to each Sub-VLAN according to the relevant multicast forwarding list item in the multicast protocol processing module by driving processing module.Router is received the multicast data message that then stops to issue to M-VLAN corresponding multicast group behind the IGMP Leave message.
For double layer network shown in Figure 2, the step that the multicast packet of M-VLAN down direction duplicates forwarding is: drive the multicast forwarding list item that processing module issues according to the multicast protocol processing module, determine to contain the VLAN ID of each Sub-VLAN of a broadcasting user, the M-VLAN head is replaced with the Sub-VLAN head, the driving processing module is duplicated it and is transmitted to Sub-VLAN, is forwarded to subscriber's main station by Sub-VLAN again.
In the networking structure as shown in Figure 2, the user side of convergence switch can be provided with two layers of access switch.As shown in Figure 2, the networking structure of realization polymerizing method for two layer multicast virtual local area network of the present invention, comprise that user side, two layer multicast virtual local area network convergence switch of the present invention and three-layer network close equipment, user side is interconnected by cut-in convergent switch and gateway device.
As shown in Figure 2, two layer multicast virtual local area network convergence switch of the present invention, its user side can also be provided with the downstream convergence switch with the convergence switch identical function, the network side of described downstream convergence switch links to each other with described convergence switch, and described downstream convergence switch user side connects user side.At this moment, the network side VLAN of downstream convergence switch also is the user side VLAN of convergence switch simultaneously, and the user side of downstream convergence switch connects user side.The user side of downstream convergence switch still can connect the access switch that supported vlans is divided.The last switching equipment of downstream convergence switch is a convergence switch, and the downstream convergence switch is a user side of convergence switch.
Downstream convergence switch network side VLAN is a M-VLAN that is exclusively used in the bear multicast message; Downstream convergence switch user side VLAN is configured to the Sub-VLAN of M-VLAN, and each subscriber's main station is configured in the different Sub-VLAN.And the M-VLAN of downstream convergence switch is a user side Sub-VLAN of convergence switch.
On the convergence switch of downstream, also can set up and safeguard and be used for determining the user side of this downstream user side that convergence switch inserts and the downstream convergence switch multicast forward table of multicast group corresponding relation.
The driving processing module of downstream convergence switch, the multicast forwarding list item according to the multicast protocol processing module of downstream convergence switch copies to the multicast traffic stream in the M-VLAN in user's Sub-VLAN of this multicast group of program request.
Introduce another embodiment of two layer multicast virtual local area network polymerization of the present invention and convergence switch thereof below, two layer multicast virtual local area network polymerization promptly of the present invention and convergence switch thereof are in the middle multicast application of IPTV.
IPTV (Internet Protocol Television) also be Web TV, is meant the television broadcasting service based on the IP agreement.This business as display terminal, to user provides broadband business such as digital broadcast television, Video service, information service, interactive community, interactive amusement and recreation, ecommerce by broadband network with television set or personal computer.The main feature of IPTV is interactivity and real-time.Subsystems such as its system configuration comprises mainly that streaming media service, program are gathered and edited, storage and authentication and accounting, main storage and the content that transmits are files in stream media, the IP based network transmission, usually the content distribution service node to be set at the edge, configuration flow media services and memory device, user terminal can be IP set-top box+television set, also can be PC.
Fig. 4 is the networking structure figure of the IPTV of operator multicast application.
As shown in Figure 4, in the networking structure of the IPTV of operator multicast application, its user side of park switch as convergence switch connects each IPTV user terminal by access switch, is equivalent to user side of the present invention, is divided into three VLANs at user side, be respectively VLAN101, VLAN1012, VLAN103 is by configuration, with VLAN101, VLAN1012 and VLAN103 are configured to the Sub-VLAN of M-VLAN 4001.Three-layer network pass equipment is BAS Broadband Access Server (Broadband Remote Access Server is called for short BRAS).
Two layer multicast virtual local area network polymerization of the present invention and convergence switch thereof in the step of the middle multicast application of IPTV are:
1) set-top-box opening carries out access authentication of user.
Be that subscriber's main station inserts certain VLAN, at this moment, convergence switch will obtain the VLAN ID of Sub-VLAN that this subscriber's main station inserts.
2) user terminal STB (Set-Top-Box, set-top box) is by obtaining program guide behind the business authentication.
Subscriber's main station gets access to the information of multicast source, can select the information of the multicast group that adds.
When 3) selecting live broadcast service, certain channel of user by selecting, user terminal are initiated the IGMP request, add corresponding multicast group.
Subscriber's main station is selected to add certain multicast group, and the demand that receives this multicast source multicast packet is promptly arranged, and subscriber's main station sends the IGMP Report message that adds this multicast group by Sub-VLAN.
4) access switch joins message transparent transmission to park switch, and park switch is discerned the user according to VLAN, and judges that by the multicast authority controlled function whether the user has the authority that adds this multicast group, if do not have, then abandons IGMP and joins message process ends; If authority is arranged, then enter next step.
Access switch is a Layer 2 switch, and access switch is handled message transmission to park switch.
5) park switch utilizes the M-VLAN polymerization property, the IGMP message is forwarded in the multicast service VLAN up, creates the multicast forwarding list item simultaneously.
Park switch as two layer multicast virtual local area network convergence switch of the present invention is handled this message according to the message processing rule, because the IGMP Report message of its to be first add this multicast group, so it is forwarded in the M-VLAN, its VLAN ID is replaced with M-VLAN ID, and transparent transmission is to the upstream switching equipment, be Service Gateway, in multicast forward table, create the multicast forwarding list item of this multicast group simultaneously, and its VLAN ID is added in this multicast forwarding list item.
6) Shang Mian Service Gateway is received after IGMP joins message multicast data flow is issued.
The Service Gateway on upper strata issues multicast data message to M-VLAN after receiving the IGMP Report message that user side sends.
7) after park switch is received multicast data flow, copy in the user vlan multicast data flow in the M-VLAN descending according to the multicast forwarding list item.
As the park switch of convergence switch after receiving the multicast traffic stream that send the upstream, according to the multicast forwarding list item, determine to contain the VLAN ID of the Sub-VLAN of a broadcasting user, the M-VLAN ID of multicast traffic stream is replaced with the VLAN ID of each Sub-VLAN, copy in the user multicast VLAN multicast data flow descending.
8) STB receives multicast data flow.
User side receives multicast data message, realizes its program request, promptly watches the programme content of the channel of its selection.
9) during switching channels, the IGMP that the IGMP that STB successively sends original channel withdraws from message and new channel joins message, when park switch is received when withdrawing from message, according to IGMP fastleave function, delete former corresponding multicast list fast, receive when joining message follow-up processing flow such as above-mentioned 4)-9).
Different channels is equivalent to different multicast group, and switching channels is equivalent to withdraw from former multicast group and adds new multicast group, and multicast forward table is set up a multicast forwarding list item for each has the multicast group of watching user and some broadcasting user.
If this network highest channel number is 100, then at convergence switch network side up direction, each has only 100 up multicast protocol messages constantly at most, promptly add and withdraw from the multicast protocol message of certain multicast group, just the user watches certain channel or stops to watch the instruction of certain channel.And at convergence switch network side down direction, each also has only 100 descending multicast traffic streams constantly at most, and promptly each channel has a multicast traffic stream descending at most.Like this great bandwidth of having saved is set, reduced the descending waste that causes of the up or identical multicast data flow of multicast data flow of the same type.
After enabling the two layer multicast virtual local area network polymerization on the convergence switch of the present invention, up direction can converge to the multicast protocol message that belongs to the some broadcasting user of different Sub-VLAN in the M-VLAN, has reduced the quantity consumed of router VLAN routing interface; And also transport multicast stream in M-VLAN only of router down direction is finished M-VLAN by convergence switch to transmit to the multicast replication user vlan, has effectively saved bandwidth resources.
Technical scheme provided by the invention can solve the VLAN aggregation problem in the double layer network multicast application, this scheme is low to inserting switch request, multicast replication is directly carried out at user vlan, and access switch only needs the supported vlans division to get final product, and does not need access switch to support multicast feature.
The present invention utilizes the multicast forwarding list item of L3 to realize the multicast forwarding of travelling across VLAN, but convergence switch remains as the L2 switch and use, and neither plays the L3 interface, and the IGMP protocol massages does not terminate yet.
Polymerizing method for two layer multicast virtual local area network of the present invention and convergence switch thereof, configuration is simple, and ease for use is strong.Do not need to realize the multicast forwarding of travelling across VLAN, simplified configuration and saved the IP address by configuration L3 interface.More flexible with the upstream equipment intercommunication, there is not the problem that cooperates between multicast routing protocol, convergence switch can support Layer 2 Multicast agreement IGMP-snooping to get final product.
Low to the switch request below the convergence switch, only need its supported vlans to divide and get final product, do not need it to support multicast features such as IGMP-SNOOPING.
The above only is a preferable possible embodiments of the present invention; described embodiment is not in order to limit the scope of patent protection of this reality invention; therefore the equivalent structure done of every utilization specification of the present invention and accompanying drawing content changes, and in like manner all should be included in protection scope of the present invention.
Claims (3)
1, a kind of polymerizing method for two layer multicast virtual local area network is characterized in that, the message processing rule with the corresponding network side VLAN multicast message of a plurality of user side VLAN multicast messages is set, and
The multicast message up direction by described user side VLAN receiving group message, is handled the back according to described message processing rule and is sent to the upstream switching equipment by described network side VLAN;
The multicast message down direction by described network side VLAN receiving group message, is handled the back according to described message processing rule and is sent to user side by described user side VLAN;
Described network side VLAN is a M-VLAN that is exclusively used in the bear multicast message of network side configuration, and described multicast message comprises multicast data message and multicast protocol message; User side VLAN is configured to the Sub-VLAN of M-VLAN, each subscriber's main station is configured in the different Sub-VLAN;
Foundation and maintenance are used for determining the multicast forward table of Sub-VLAN and multicast group corresponding relation in M-VLAN, and described multicast forward table is set up a multicast forwarding list item for each multicast group;
After M-VLAN is received the IGMP Report message of user side, the VLAN ID of this message is joined in the multicast forwarding list item of this multicast group, after M-VLAN is received the IGMP Leave message of user side, the VLAN ID of this message is deleted from the multicast forwarding list item of this multicast group;
According to described multicast forwarding list item, the multicast traffic stream in the M-VLAN copied in corresponding user's Sub-VLAN transmit;
By operation IGMP Snooping agreement, monitoring users main frame IGMP protocol massages, described message processing rule is:
For in Sub-VLAN, send IGMP Report message by user side, first user side VLAN ID that adds the IGMP Report message of this multicast group is replaced with the VLAN ID of M-VLAN, forward to and be transmitted to the upstream switching equipment in the M-VLAN, suppress the IGMP Report message of follow-up this multicast group of adding;
Inhibition is sent IGMP Leave message by user side in Sub-VLAN, the VLAN ID with last user side VLAN ID that withdraws from the IGMP Leave message of this multicast group replaces with M-VLAN forwards to and upwards is transmitted to the upstream switching equipment in the M-VLAN.
2, polymerizing method for two layer multicast virtual local area network as claimed in claim 1 is characterized in that, sets the time interval of a sustainable batch processing of user side,
At the multicast message up direction, focus on the multicast message that in the described time interval, receives according to described message processing rule, and the message after will handling is sent to the upstream switching equipment by described network side VLAN by described user side VLAN.
3, a kind of two layer multicast virtual local area network convergence switch is characterized in that, the message processing rule with the corresponding network side VLAN multicast message of a plurality of user side VLAN multicast messages is set on the described convergence switch, and
Multicast message up direction, described convergence switch are handled the back according to described message processing rule and are sent to the upstream switching equipment by described network side VLAN by described user side VLAN receiving group message;
Multicast message down direction, described convergence switch are handled the back according to described message processing rule and are sent to user side by described user side VLAN by described network side VLAN receiving group message;
Described network side VLAN is a M-VLAN that is exclusively used in the bear multicast message of convergence switch network side configuration, and described multicast message comprises multicast data message and multicast protocol message; User side VLAN is configured to the Sub-VLAN of M-VLAN, and each user side is configured in the different Sub-VLAN;
Described convergence switch comprises: ether processing module and driving processing module, wherein:
Described ether processing module is used to be provided with described message processing rule, and handles the multicast message that described driving processing module is imported according to described message processing rule, and the multicast message after handling is outputed to described driving processing module;
Described driving processing module receives the multicast message that multicast message that user side sends by user side VLAN and upstream switching equipment issue by network side VLAN, with described multicast message input ether processing module; Transmit the multicast message of described ether processing module output;
Described convergence switch also comprises the multicast protocol processing module, described multicast protocol processing module can be obtained the VLAN ID of multicast message, foundation and maintenance are used for determining the multicast forward table of user side and multicast group corresponding relation in described multicast protocol processing module, and described multicast forward table is set up a multicast forwarding list item for each multicast group;
Described multicast protocol processing module joins the VLAN ID that joins message in the multicast forwarding list item of its multicast group; The VLAN ID that withdraws from message is deleted from the multicast forwarding list item of its multicast group;
After described driving processing module is received the multicast protocol message of user side, send described message to described multicast protocol processing module by the ether processing module;
Described driving processing module according to the multicast forwarding list item that described multicast protocol processing module issues, copies to the multicast traffic stream in the M-VLAN in the Sub-VLAN of this multicast group of program request;
Pass through operation IGMP Snooping agreement on the described convergence switch, monitoring users main frame IGMP protocol massages, described message processing rule is:
For in Sub-VLAN, send IGMP Report message by user side, the VLAN ID that after described multicast protocol processing module is received first is added the IGMP Report message of this multicast group replaces with the VLAN ID of M-VLAN, output to described driving processing module and be transmitted to the upstream switching equipment, the IGMP Report message of follow-up this multicast group of adding will be suppressed by described multicast protocol processing module;
For in Sub-VLAN, send IGMP Leave message by user side, the VLAN ID that only last is withdrawed from the IGMP Leave message of this multicast group after described multicast protocol processing module is received replaces with the VLAN ID of M-VLAN, output to described driving processing module and be transmitted to the upstream switching equipment, the IGMP Leave message that before withdraws from this multicast group will be suppressed by described multicast protocol processing module.
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| CN100583801C (en) * | 2007-11-30 | 2010-01-20 | 华为技术有限公司 | A method, system and switching device for dynamically establishing multicast virtual LAN |
| CN101325531B (en) * | 2008-07-26 | 2012-05-23 | 中兴通讯股份有限公司 | Virtual local area network forwarding method and system |
| CN102130831A (en) * | 2011-02-18 | 2011-07-20 | 李金方 | Networking method based on super virtual local area network (Super VLAN) technology |
| CN102263703B (en) * | 2011-08-29 | 2014-01-01 | 华为技术有限公司 | Method, device and network system for transparently transmitting and multicasting protocol messages |
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| CN104243608B (en) * | 2014-09-29 | 2018-02-06 | 华为技术有限公司 | A kind of communication means, cloud management server and virtual switch |
| CN105939276B (en) * | 2015-10-29 | 2019-11-12 | 杭州迪普科技股份有限公司 | The retransmission method and device of multicast data message |
| CN107276774B (en) * | 2016-04-08 | 2020-07-24 | 华为技术有限公司 | Multicast message transmission method and forwarding equipment |
| CN106713348B (en) * | 2017-01-17 | 2019-12-31 | 无锡雷华网络技术有限公司 | OLT multicast uplink protocol message forwarding method and system |
| CN108924052B (en) * | 2018-07-17 | 2021-07-06 | 迈普通信技术股份有限公司 | Message forwarding method, convergence gateway, access gateway and system |
| CN109194559B (en) * | 2018-08-29 | 2021-04-30 | 迈普通信技术股份有限公司 | Multicast method and VTEP device |
| CN110391919B (en) * | 2019-07-12 | 2021-03-23 | 杭州迪普科技股份有限公司 | Multicast traffic forwarding method and device, and electronic device |
| CN110971499B (en) * | 2019-12-10 | 2021-11-12 | 上海市共进通信技术有限公司 | Method for realizing uniform analysis and processing of VLAN service |
| CN112367263B (en) * | 2020-10-30 | 2022-07-12 | 新华三技术有限公司 | Multicast data message forwarding method and equipment |
| CN117041136B (en) * | 2023-10-10 | 2024-01-23 | 北京国科天迅科技股份有限公司 | Multicast management method, system, device, switch and storage medium |
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