CN100337457C - Cross-VLAN layer 2 multicast data transmission method of Ethernet switch - Google Patents
Cross-VLAN layer 2 multicast data transmission method of Ethernet switch Download PDFInfo
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- CN100337457C CN100337457C CNB2005100732867A CN200510073286A CN100337457C CN 100337457 C CN100337457 C CN 100337457C CN B2005100732867 A CNB2005100732867 A CN B2005100732867A CN 200510073286 A CN200510073286 A CN 200510073286A CN 100337457 C CN100337457 C CN 100337457C
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Abstract
The present invention provides a cross-VLAN multicast data transmission method for two-layer multicast of an Ethernet exchanger, which comprises that first, VLANs which are specially used for carrying multicast data flows of multicast sources are arranged on an Ethernet exchanger, namely multicast distribution VLANs (MDV); then an IGMP snooping protocol is run on the Ethernet exchanger to snoop around the interaction between multicast members distributed at any VLAN in the Ethernet exchanger and IGMP messages of a router and learns link information of the multicast members which need to receive the multicast data streams. When the Ethernet exchanger receives the multicast data streams from the router in an MDV, the Ethernet exchanger establishes a new multicast data retransmitting table which adopts a two-stage data structure to record the link information of the multicast members. The Ethernet exchanger copies multicast data messages to all clicked VLANs according to the new multicast data retransmitting table in a spanning VLAN mode, and the multicast data messages are sent to users from respective multicast member ports of the clicked VLANs, so that the two-layer multicast of the Ethernet exchanger can realize the cross-VLAN multicast data transmission.
Description
Technical field
The invention belongs to technical field of the computer network, particularly relate to a kind of layer 2 multicast data transmission method of in network, realizing the Ethernet switch travelling across VLAN.
Background technology
Broadband IP network begins to take shape through in a few years construction, and the network infrastructure in high broadband and considerable number of users have been arranged.FTP, HTTP, conventional data network business such as Email have been difficult to satisfy the demand of user to information service, for the user provides new Network and service, improve the core missions that broadband network operation income has become current operator.Multicast type business such as remote teaching, news briefing, Web TV will become new round operation competition focal point, and sub-district IPTV becomes the new Network that operator preferentially carries out fast; The multicast-capable of Ethernet is strong, the bandwidth height, and cost is low to be the professional desirable carrying basis of this class.
General sub-district Ethernet structure as shown in Figure 1, user network equipment and layer 2 ethernet switch are direct-connected, router is by 100,000,000 link aggregation Layer 2 switch; Layer 2 switch generally can connect 24 or 48 users.When carrying out multicast type services such as IPTV, media server (channel program source) sends to router to the program data stream of each channel, router sends to Layer 2 switch for each user duplicates portion again, Layer 2 switch sends program data stream to user, and arrow is represented situation among whole process such as Fig. 1.Create a VLAN for each user on the Layer 2 switch, switch can only be transmitted in VLAN, can not transmit by travelling across VLAN,, and directly be transferred to the VLAN that the user is arranged on the Layer 2 switch so router need all duplicate a data flow separately for each VLAN on the Layer 2 switch; Each channel data flow of IPTV is generally 2-4Mbps, for the Layer 2 switch that 24 users are arranged, even each user only watches a channel simultaneously, need 4Mbps bandwidth program for high definition, IPTV data traffic sum between Layer 2 switch and the router is 96Mbps, and physical link also has only 100Mpbs between the two, so can not support subscriber household to see the program of a plurality of channels, the bandwidth of other types network application also can be tied up totally simultaneously, is had a strong impact on.
In the ethernet network of typical sub-district, Layer 2 switch can not be transmitted and the copy data message by travelling across VLAN, router copies to a plurality of VLAN to multicast traffic stream and is handed down to Layer 2 switch, the result is exactly that 100,000,000 links between Layer 2 switch and the router become bottleneck, one of several difficult points of Here it is current developing multicast type service, promptly the transmission efficiency of data flow is not high.100,000,000 links between Layer 2 switch and the Router are upgraded to gigabit link can alleviate problem, but require gigabit Layer 2 switch and router, cost can extensive rise, and along with the carrying out of more this type business, link bandwidth still can become bottleneck very soon.
Summary of the invention
The present invention overcomes existing Ethernet switch Layer 2 Multicast and can not travelling across VLAN transmits and the deficiency of copy data message, a kind of Ethernet switch layer 2 multicast data transmission method is provided, makes the Ethernet switch Layer 2 Multicast have the function of travelling across VLAN multicast data transmission message.
Technology contents of the present invention: a kind of layer 2 multicast data transmission method of Ethernet switch travelling across VLAN, its step comprises:
Ethernet switch receives the multicast traffic stream from router in the multicast distributing virtual local area network (LAN), the operation IGMP is monitored IGMP Snooping agreement, learn the link information of the multicast member of described multicast traffic stream, set up the transmitting multicast data table, and according to described transmitting multicast data table, the multicast data message cross-VLAN is copied to the program request VLAN, and send the user to from each multicast group member port of described program request VLAN;
Wherein, described multicast distributing virtual local area network (LAN) is the VLAN of the multicast traffic stream that is exclusively used in the bear multicast source created on the Ethernet switch,
Described IGMP Snooping agreement has been done partly expansion, is used to monitor the Internet igmpinternet message that the multicast member that is distributed in any VLAN that switch creates sends,
Described program request VLAN is for existing the VLAN that need carry out the user of program request.
IGMP Snooping agreement has been done partly expansion, can also concentrate in the MDV and carry out the IGMP message interaction with upstream router.
The IGMP message that IGMP Snooping agreement sends by the monitoring multicast member is learnt the link information of multicast member, and the link information of multicast member comprises the label TAG of physical port number and affiliated VLAN thereof.
The transmitting multicast data table adopts the link information of two-stage data structure records multicast member, the two-stage data structure comprises multicast link table and member port tabulation, the multicast link table is deposited the TAG of program request VLAN, each node of multicast link table is represented a program request VLAN, a member port tabulation is all arranged under each node, the shared member port tabulation of all multicast members under the different program request VLAN, a physical port of each nodes records switch of member port tabulation.
Technique effect of the present invention: the IGMP Snooping agreement by expansion is calculated, in MDV, set up new transmitting multicast data table, new transmitting multicast data table adopts two-stage data structure sign multicast member, increases the TAG that the multicast link table is used to deposit program request VLAN.Switch is according to the TAG of program request VLAN duplicated multicast data message respectively, and each multicast group member port from program request VLAN under sends to the user, thus the Layer 2 Multicast transfer of data of realization Ethernet switch travelling across VLAN.
Description of drawings
Below in conjunction with accompanying drawing, the present invention is made detailed description.
Fig. 1 is the Ethernet structure schematic diagram;
Fig. 2 MDV structural representation;
Fig. 3 transmitting multicast data list item schematic diagram;
Fig. 4 embodiment of the invention schematic diagram.
Embodiment
MDV-Multicast Distributing VLAN is VLAN who is exclusively used in the multicast traffic stream in bear multicast source on the Ethernet switch, and the exchange function controllably copies to the multicast traffic stream among this VLAN among other a plurality of program request VLAN goes.As shown in Figure 2, MDV receives the source IP multicast traffic stream of a plurality of multicast group from core/convergence-level, and switch copies to descending user's program request VLAN with multicast data message, and G1, G2, G3 represent to have the multicast traffic stream of a plurality of multicast group among Fig. 2.
The agreement computational entity of MDV is the IGMP Snooping agreement after the part expansion, can monitor the mutual of IGMP message between the multicast member that is distributed in any VLAN of switch and the router, study needs the group address of the multicast traffic stream of the link information of multicast member of receiving multicast data stream and upstream router, and the link information of multicast member comprises the TAG of physical port ID and affiliated VLAN thereof.
When router transmission multicast packet flow to Ethernet switch, switches learn began to create new Layer 2 Multicast data forwarding table to the group address of multicast traffic stream.Fig. 3 is the schematic diagram of new transmitting multicast data table.New transmitting multicast data table adopts the link information of two-stage data structure records multicast member, and the two-stage data structure is made of multicast link table and member port tabulation.Program request VLAN with different TAG is distributed in the multicast link table, and each node of multicast link table is represented a program request VLAN.Different program request VLAN has a member port tabulation respectively, shared this member port tabulation of all multicast members under each program request VLAN, a physical port of each nodes records switch of member port tabulation, i.e. a multicast member.New transmitting multicast data table is distributed in the user of different VLAN by above-mentioned two-stage data structure sign.
Fig. 3 is the forwarding data table items that example has been described a multicast group to organize 1, has a plurality of multicast group in actual the use, and the forwarding-table item of other groups all will be set up forwarding-table item with this form.
Fig. 4 is typical multicast network topological structure, and each user distribution is in different VLAN among the figure.We will describe certain channel program of user's program request in detail according to this figure, promptly add and leave the overall process of certain group.
Layer 2 switch has listened to the user need add certain group, can give up router with user's Report message reporting from MDV, note the inbound port ID of Report message and the TAG of affiliated VLAN thereof simultaneously, so that in the transmitting multicast data table, identify this user.
Router is after receiving the Report message that Layer 2 switch reports, and multicast data forwarding flows to Layer 2 switch, and this multicast traffic stream flows into Layer 2 switch in MDV.Layer 2 switch begins to create new transmitting multicast data table, and at first the TAG with VLAN under the user adds the multicast link table to, and secondly the ID with physical port adds in the member port tabulation of this program request VLAN.
When router constantly issues multicast traffic stream, Layer 2 switch matches specific transmitting multicast data list item according to the group address of multicast traffic stream, from the multicast link table of this list item, find active user's program request VLAN, obtain the physical port of this multicast traffic stream again from the member port tabulation of each program request VLAN, realized the transmission of Layer 2 switch thus the travelling across VLAN of multicast traffic stream.
Need leave certain group when Layer 2 switch listens to the existing subscriber, still give up router from MDV with user's Leave message reporting, router no longer issues multicast traffic stream.Simultaneously, the Layer 2 switch link information that will identify this user is deleted from the transmitting multicast data table.
Claims (4)
1, a kind of layer 2 multicast data transmission method of Ethernet switch cross-VLAN, its step comprises:
Ethernet switch receives the multicast traffic stream from router in the multicast distributing virtual local area network (LAN), the operation IGMP is monitored IGMP Snooping agreement, learn the link information of the multicast member of described multicast traffic stream, set up the transmitting multicast data table, and according to described transmitting multicast data table, the multicast data message cross-VLAN is copied to the program request VLAN, and send the user to from each multicast group member port of described program request VLAN;
Wherein, described multicast distributing virtual local area network (LAN) is the VLAN of the multicast traffic stream that is exclusively used in the bear multicast source created on the Ethernet switch,
Described IGMP Snooping agreement has been done partly expansion, is used to monitor the Internet igmpinternet message that the multicast member that is distributed in any VLAN that switch creates sends,
Described program request VLAN is for existing the VLAN that need carry out the user of program request.
2, the layer 2 multicast data transmission method of Ethernet switch cross-VLAN as claimed in claim 1 is characterized in that: described IGMP Snooping agreement can also concentrate in the multicast distributing virtual local area network (LAN) carries out Internet igmpinternet message interaction with upstream router.
3, the layer 2 multicast data transmission method of Ethernet switch cross-VLAN as claimed in claim 2, it is characterized in that: the Internet igmpinternet message that described IGMP Snooping agreement sends by the monitoring multicast member is learnt the link information of multicast member, and the link information of multicast member comprises the label of physical port number and affiliated VLAN thereof.
4, as claim 1, the layer 2 multicast data transmission method of 2 or 3 described Ethernet switch cross-VLANs, it is characterized in that: described transmitting multicast data table adopts the link information of two-stage data structure records multicast member, the two-stage data structure comprises multicast link table and member port tabulation, described multicast link table is deposited the label of program request VLAN, each node of described multicast link table is represented a program request VLAN, a member port tabulation is all arranged under each node, the shared member port tabulation of all multicast members under the different program request VLANs, a physical port of each nodes records switch of member port tabulation.
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100420195C (en) * | 2006-09-27 | 2008-09-17 | 华为技术有限公司 | Internet set managerial protocol report inhibiting method and communications network system |
| CN101163093B (en) * | 2006-10-12 | 2011-07-13 | 中兴通讯股份有限公司 | Method of implementing centralized multicast management on integrated access equipment |
| CN101175068B (en) * | 2006-11-02 | 2011-08-17 | 上海未来宽带技术及应用工程研究中心有限公司 | Multi-version multicast protocol amalgamation method |
| CN1980246B (en) * | 2006-12-07 | 2011-04-13 | 杭州华三通信技术有限公司 | Two-layer multi-casting flow retransmission method |
| CN100563213C (en) * | 2006-12-27 | 2009-11-25 | 华为技术有限公司 | The implementation method that IGMP is intercepted, system and device |
| CN101170513B (en) * | 2007-11-23 | 2010-09-29 | 中兴通讯股份有限公司 | Control method for access user multicast service |
| 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 |
| CN101262419B (en) * | 2008-01-30 | 2011-05-18 | 华为技术有限公司 | Multicast service forward method and device |
| CN101267396B (en) * | 2008-03-19 | 2011-01-05 | 北京星网锐捷网络技术有限公司 | A realization device and method for downstream interface list of multicast route |
| CN101252456B (en) * | 2008-03-20 | 2010-12-08 | 华为技术有限公司 | Apparatus, system and method for multicasting traffic wholesale |
| WO2011160300A1 (en) | 2010-06-24 | 2011-12-29 | 华为技术有限公司 | Method, apparatus and system for implementing multicast |
| CN101895481B (en) * | 2010-08-31 | 2013-01-09 | 迈普通信技术股份有限公司 | Bridging method for supporting second-layer multicast forwarding and router thereof |
| CN101938429B (en) * | 2010-09-30 | 2012-08-29 | 迈普通信技术股份有限公司 | Two-layer multicast forwarding method based on two-layer multicast domain and router |
| CN105490942B (en) * | 2014-09-17 | 2019-09-24 | 联想(北京)有限公司 | A kind of information processing method and electronic equipment |
| CN106034061A (en) * | 2015-03-10 | 2016-10-19 | 中兴通讯股份有限公司 | Service uplink forwarding method, service downlink forwarding method, service uplink forwarding device and service downlink forwarding device |
| CN104683769B (en) * | 2015-03-11 | 2017-12-12 | 瑞斯康达科技发展股份有限公司 | A kind of method and device that multicast on demand is realized under ring environment |
| CN106789649B (en) * | 2016-12-19 | 2019-12-31 | 中国电子科技集团公司第二十研究所 | Layer two multi-path fast routing method based on labels |
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| EP1318628A1 (en) * | 2001-12-10 | 2003-06-11 | Alcatel | Method and apparatus of directing multicast traffic in an Ethernet MAN |
| CN1458771A (en) * | 2002-05-15 | 2003-11-26 | 华为技术有限公司 | Multicasting messag transmission method base on two layer exchange device |
| CN1540932A (en) * | 2003-04-22 | 2004-10-27 | 华为技术有限公司 | Implementing Method for sending datagram type message from assigned port |
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