CN100518119C - Method for implementing Ethernet multicast based on internetwork grouping management agreement - Google Patents
Method for implementing Ethernet multicast based on internetwork grouping management agreement Download PDFInfo
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- CN100518119C CN100518119C CNB2007101114828A CN200710111482A CN100518119C CN 100518119 C CN100518119 C CN 100518119C CN B2007101114828 A CNB2007101114828 A CN B2007101114828A CN 200710111482 A CN200710111482 A CN 200710111482A CN 100518119 C CN100518119 C CN 100518119C
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Abstract
The present invention discloses an Ethernet multicast realization method based on the internet grouping management protocol v3 edition, which can realize the Ethernet multicast in the IGMPv3. The present invention comprises the following steps: (a) after the Ethernet exchanger receives the multicast member report, the multicast member information table is updated, the information recorded in the multicast member information table comprise a multicast address, a virtual local area network number, an interface number, a source record, and the multicast address, the virtual local area network number and the interface number are used to mark a record uniquely; (b) when the Ethernet exchanger receives multicast flow data, and the data are required to transmitted to the user, the multicast member information table is checked according to the multicast address, the virtual local area network number, and the source record carried in the multicast flow data to determine the transmission direction of the multicast flow data.
Description
Technical field
The present invention relates to IP network, particularly a kind of Ethernet multiport method of realizing group broadcasting based on the Internet packet management agreement (IGMP).
Background technology
The IP multicasting technology has been realized the efficient data transmission of IP network mid point to multiple spot.This technology is conserve bandwidth, reduction offered load effectively, is widely used in all many-sides such as multimedia conferencing, real-time Data Transmission, recreation.IGMP (Internet Group Management Protocol, the Internet packet management agreement) is important module in the IP multicast route technology, the multicast member report information that the multicast router of operation IGMP agreement is responsible for collecting is given other multicast routers, so multicast router serves as " multicast path is by side " and " multicast user's side " two kinds of roles in the IGMP agreement.
IGMPv3 (IGMP the 3rd edition) has increased IPv4 (Internet protocol the 4th edition) source filtering function on IGMPv2 (IGMP the 2nd edition) basis, promptly system can specify reception to receive from the multicast data flow beyond the particular source from the multicast data flow or the appointment of particular source.The IGMPv3 standard is defined by RFC3376, wherein describes the function of the system of operation IGMPv3 at route side and user side in detail.
In the route side, system mainly finishes the multicast monitoring function.System cycle transmission general polling message, group membership's information of request place network.For the situation that a plurality of interfaces are arranged in the same network, only use an interface to handle in the agreement, and (list structure defines: { multicast address multicast address (being called for short MA) to use the multicast member information table, group timer group timer, filtered model filter-mode, the organization definition of source record source records}}, source record source address source address, source timer source timer}) write down multicast member information.Wherein, { source records} is used to write down the IP address that all ask the system of multicasts, is the set of source record.The dissimilar user report of receiving for the route side joint (as the report of different multicast group address or the report of different multicast group address and different source addresses), according to the described Policy Updates multicast member information table of the 6.4th joint in the standard, and the multicast inquiry message of transmission particular group or particular source.
At user side, system according to multicast monitoring to multicast information finish the multicast agent function.When system receives the general polling message, the multicast member information table of system queries oneself, and the information about firms of transmission Current-State Record reports to router.When user expired because of the multicast group timer, that the source address timer is expired, new joins request etc. when causing that the system multicast information about firms changes, send State-Change Report message to router according to the described rule of the 5.1st joint in the standard, guarantee the unanimity of multicast tree in the network with this.
Only use the multicast member information table of an interface to write down the multicast request of a plurality of ports in the network in the IGMPv3 standard, though in the IPv4 routing multicast, can set up multicast tree preferably and realize the shearing of multicast tree, in the Ethernet multicast, can not control to the multicast data flow of specific user's port.The IGMPv3 multicast routing protocol of describing in the standard is only considered the multicast information management of multi-cast system realization single network node, the regulatory requirement of discontented sufficient Ethernet multi-cast system multiport.In the Ethernet multi-cast system, which multicast data flow of which port request in the multicast group of need knowing for sure the record, comprise which information, to satisfy of the multicast data flow control of upper-layer service such as IPTV to the particular port user.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of Ethernet method of realizing group broadcasting based on the Internet packet management agreement v3 version, realizes the Ethernet multicast among the IGMPv3.
In order to address the above problem, the invention provides a kind of Ethernet method of realizing group broadcasting based on internetwork grouping management agreement, may further comprise the steps:
(a) after Ethernet switch is received the multicast member report, upgrade multicast information about firms table, the information that writes down in the described multicast member information table comprises multicast address, the virtual local area network No., port numbers, source record, described source record comprises source address and source address timer, described multicast address, the virtual local area network No., a record in the port numbers unique identification table, described Ethernet switch makes up a multicast member relation table according to described multicast member information table, the content that writes down in the described multicast member relation table comprises: multicast address, the virtual local area network No., source address and port list, described multicast address, the virtual local area network No., source address is used for the record of label table;
(b) when Ethernet switch receives that the multicast data flow data need be transmitted to the user, search described multicast member relation table according to the multicast address that carries in the multicast data flow data, virtual local area network No., source address, determine the transmit port of multicast data flow data.
Further, said method also can have following characteristics, described step (a) further comprises: Ethernet switch is resolved the multicast member report, judge whether to exist multicast member information record with described index information according to the index information in the message, if, then upgrade this record, otherwise, create a new record, comprise multicast address, virtual local area network No., port numbers, source record in the record.
Further, said method also can have following characteristics, and the multicast address in the described multicast member report message, virtual local area network No. and port numbers are index information.
Further, said method also can have following characteristics, in described step (a), described multicast member information table upgrades the renewal that described multicast member relation table is triggered in the back, and the renewal of described multicast member relation table comprises: search described multicast member relation table respectively with multicast address, VLAN port numbers, each source address, judge whether to exist the multicast member relation record with above-mentioned information, if, then upgrade this record, otherwise, a new record created.
Further, said method also can have following characteristics, after existence has the multicast member relation record of above-mentioned information in judging described multicast member relation table, if judge that again the source address timer is not out of date and source address is effective, then port information is added in the port member tabulation of this record.
Further, said method also can have following characteristics, and new record of described establishment is meant that the port that the source address timer is not out of date adds in the record of multicast member relation table correspondence of new establishment.
Further, said method also can have following characteristics, and described multicast member relation table regularly detects multicast member relation table after upgrading, and upgrades multicast address, virtual local area network No., port list, source address in the exchanger chip synchronously.
Compared with prior art, adopt the method for the invention, on existing IP agreement multicast route basis, in system's route side, by multicast member information is managed, realize multicast management and control, further guarantee the high efficiency and the accuracy of user multicast request.
Description of drawings
Fig. 1 realizes the flow chart of the multicast of IGMPv3 for present embodiment;
Fig. 2 is multicast member information table contrast figure in present embodiment and the prior art;
Fig. 3 is the mapping relations figure of present embodiment multicast member information table and multicast member relation table;
Fig. 4 is the renewal flow chart of present embodiment multicast member information table;
Fig. 5 is the synchronized relation figure of present embodiment multicast member information table and multicast member relation table;
Fig. 6 is the renewal flow chart of present embodiment multicast member relation table;
Fig. 7 is that present embodiment Ethernet switch chips is upgraded flow chart.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
By side,, can realize the multicast of IGMPv3 at the IGMPv3 multicast path, increase a static multicast member relation table simultaneously newly, Ethernet switch multiport user's multicast member management of information is provided by expanding original multicast member information table structure.As shown in Figure 1, may further comprise the steps:
Step 1, Ethernet switch are received multicast member report, upgrade multicast information about firms table, and the information that writes down in the multicast member information table comprises multicast address, vlan number, Port number and source address;
Ethernet switch extracts vlan number and will receive that Port number of this message joins in the multicast member information table from the report of the multicast member received.
The report of described multicast member can be by Ethernet switch inquiry regularly and get, perhaps descends user initiatively to report by it and gets.
Step 2, when Ethernet switch received that multicast data flow data that the multicast data flow server is sent need be transmitted to the user, tabling look-up sent to the user with the multicast data flow data.
Carry multicast address, vlan number, source address information in the multicast data flow data that the multicast data flow server is sent, Ethernet switch tables look-up to determine which user is these multicast data flow data sent to by which port according to these information.
In step 1, owing in the multicast member information table, added vlan number and Port number, as shown in Figure 2, be aimed at which user so that after Ethernet switch is received the multicast data flow data, can determine this multicast data flow data, thereby can realize the IGMPv3 multicast.
In order to guarantee the efficient and accurate of user multicast request, present embodiment also makes up a multicast member relation table, multicast member relation table and multicast member information table have mapping relations (as shown in Figure 3), when the multicast member information table upgrades, upgrade multicast member relation table simultaneously.After Ethernet switch is received the multicast data flow data, can directly look into the multicast member relation table multicast data flow data are sent to the user.
Step 1 is further specified as follows:
Expand original multicast member information table structure, on original multicast member information table, add VLAN and port information, satisfied the Ethernet switch system carries out the multicast information management by the VLAN middle port under the IGMPv3 standard demand, as shown in Figure 2, be about to original multicast member information table structural extended for comprising following content: virtual local area network No. VLAN, multicast address multicast address, port numbers port, group timer group timer, filtered model filter-mode, source record source records, wherein VLAN and port are for increasing content, and the structure of source records is constant.Each Ethernet interface all can write down the multicast group information on the connected network like this, and according to the 6.4 Policy Updates multicast member information tables that save among the RFC3376.
Ethernet switch upgrades multicast information about firms list structure according to the IGMPv3 multicast member report of receiving, as shown in Figure 4, may further comprise the steps:
Step 401, Ethernet switch are resolved the multicast member report, extract vlan number, port number, MA, user report type and multicast source address list information from message;
Step 402, with MA, VLAN and port is that index information is searched the multicast member information table, judge whether the multicast member data entries with this index information exists, if, according to the rule of mating in 12 rules of RFC3376 the 6.4th joint, upgrade described multicast member data entries, otherwise, next step carried out;
Therefore VLAN, port, list item of the unique difference of MA, promptly each list item has at least VLAN, port different with other list items with MA, is that index is searched with MA, VLAN and port, in can multicast member information table of unique definition one.
Step 403 is created new user profile record clauses and subclauses, comprises information such as MA, VLAN, port and source address in the clauses and subclauses;
After having upgraded the multicast member information table,,, notify multicast member relation table to upgrade corresponding multicast relations items for information respectively then according to MA, VLAN in corresponding multicast user's information table and each source address information if having the multicast member relation table; If no, then create a multicast member relation table.
Further specify as follows to the multicast member relation table:
The multicast member relation table has write down the information relevant with multicast, comprise following content: VLAN, multicast address, source address, port list port list, filter-mode, this table record all member port information of each source address correspondence.Clauses and subclauses are to be formed by many record mappings in the multicast member information table in the static multicast member relation table, and both mapping relations as shown in Figure 4.It has not only write down all of the port information of same VLAN, multicast address and sourceaddress in the information about firms table, has also write down the pattern that the last member of relevant this multicast entry reports simultaneously.
Specifically, in the multicast member information table, may every group MA, VLAN and port correspondence a plurality of (in the source record) source address, therefore when switch issues multicast data flow, need all multicast member information tables of traversal, search all source addresses of this multicast data flow data correspondence.And the multicast member relation table to be major event with the source address set up, determine all of the port information of this multicast data flow correspondence to make switch can issue the multicast data flow data fast and accurately from the corresponding port with source address, MA and vlan information.
The multicast member relation table can be static being kept on the switch, also can dynamically set up the static more convenient maintenance of multicast member relation table.
As shown in Figure 5, Ethernet multi-cast system synchronous static multicast member relation table and multicast member information table, promptly Ethernet switch upgrades multicast member relation table according to the multicast member information table, may further comprise the steps:
Step 501, after the multicast member relation table is received multicast user's information to be updated (comprising VLAN, MA and multicast source address chained list), with VLAN, MA, each multicast source address is that the multicast member relation table searched respectively in index, judge whether record exists, if, carry out next step, otherwise, execution in step 503;
Multicast user's information to be updated can also comprise information such as port, user report type.
Step 502, judge that the multicast source address timer is whether expired and/or whether multicast source address is invalid, if, remove corresponding port information in the multicast member tabulation of this index record, otherwise, port information is added in multicast port member's tabulation of these clauses and subclauses, upgrade the relationship entries correlation behavior of manipulative indexing simultaneously, as organize timer, the multicast group pattern, write information such as chip sign;
Only do not have expired and multicast source address when effective, just add port information at the multicast source address timer; Otherwise, all remove corresponding port information in the multicast member tabulation of this index record, comprise one of following situation: the multicast source address timer is out of date, multicast source address is invalid, the multicast source address timer is out of date and multicast source address is invalid.
Step 503, the port that the source address timer is not out of date are added in the corresponding clauses and subclauses of multicast member relation table of new establishment, upgrade the relationship entries correlation behavior of manipulative indexing simultaneously, as the group timer, the multicast group pattern, write information such as chip sign.
Order is not limit in above-mentioned judgement, for example can adopt flow process as shown in Figure 6 yet.
The situations such as user side group timer variation of the route side state transition of the 6th joint definition and the 5th joint definition cause the incident that the multicast member information table upgrades among the RFC3376, all need synchronous static member's relation table.
In step 2, after Ethernet switch upgrades multicast member relation table,, regularly detect member's relation table according to timer message event (regularly) in order to control the direction of switch multicast stream, come operation chip multicast table timely, in batches.
System regularly detects each clauses and subclauses of member's relation table, if relationship entries is effectively and to write the chip sign effective, and new chip more then; If relationship entries is invalid, then press top-operation and remove the corresponding multicast group information of chip, thereby repeat to write the operation of chip when avoiding a plurality of users to ask same multicast address, guarantee the synchronous of chip and member relation table, thereby and guaranteed that multicast data flow asks timely forwarding by the user.May further comprise the steps:
Step 701, whether detect in the multicast member relation table clauses and subclauses effective, if, continue to carry out, otherwise, remove the list item in the multicast member relation table corresponding in list item in the multicast member relation table and the chip respectively;
Step 702 detects whether write the chip sign in the multicast member relation table effective, if the data entries that then this is comprised VLAN, multicast address, source address and the port member tabulation chip that writes direct covers the information about firms of the original corresponding multicast group of chip.
Ethernet switch can carry out the detection of a multicast member relation table by every 10ms, and this time is set according to systematic function with such as requirements such as the IPTV service interfacing time receiving prolong, can change.Detection regularly can be controlled the multicast data flow of user port in faster, simpler realization, guarantees in special applications such as video conference, delays time less than 20ms for the multicast data flow response of user's request.
Can adopt flow process as shown in Figure 7 during specific implementation.
Above method of operation is upgraded multicast information about firms table record according to user's mode of operation of stipulating among the RFC3376, and carries out operations such as multicast group mode switch and the transmission of multicast inquiry message according to rule.For example, all handle about the management of the processing of user's message and response, agent functionality, timer etc. according to the descriptions of the 4th, 5,6 joints among the RFC3376; The timer rule that the renewal of multicast member information table record is described according to the 5th, 6 joints among the RFC3376, and close information according to the mode of operation synchronization multicast member relation epiphase in the second.
By the enforcement of above step, realized the management of multiport IGMPv3 user profile on Ethernet switch, and carried out multicast data flow control according to the multicast group information that port adds.On the one hand, on original multicast user's information table, add VLAN and PORT information, satisfied the Ethernet switch system and under the IGMPv3 standard, carried out the multicast information regulatory requirement by the VLAN middle port; Next adds the synchronous of static multicast member relation table and realization and multicast member information table, and the assurance system finishes simply, efficiently based on the multicast data flow of VLAN and port by this static multicast member relation table and controls; Once more, system's every 10ms traversal multicast member relation table sign, multicast information to be updated is synchronized in the hardware multicast address table in batches, reduced the problem of system's frequent operation hardware, also satisfied simultaneously the speed of system responses user multicast stream request, the business of controlling based on the Ethernet multicast for the upper strata provides guarantee.
Claims (7)
1, a kind of Ethernet method of realizing group broadcasting based on internetwork grouping management agreement may further comprise the steps:
(a) after Ethernet switch is received the multicast member report, upgrade multicast information about firms table, the information that writes down in the described multicast member information table comprises multicast address, the virtual local area network No., port numbers, source record, wherein, described source record comprises source address and source address timer, described multicast address, the virtual local area network No., a record in the port numbers unique identification table, described Ethernet switch makes up a multicast member relation table according to described multicast member information table, the content that writes down in the described multicast member relation table comprises: multicast address, the virtual local area network No., source address and port list, described multicast address, the virtual local area network No., source address is used for the record of label table;
(b) when Ethernet switch receives that the multicast data flow data need be transmitted to the user, search described multicast member relation table according to the multicast address that carries in the multicast data flow data, virtual local area network No., source address, determine the transmit port of multicast data flow data.
2, the method for claim 1 is characterized in that, described step (a) further comprises:
Ethernet switch is resolved the multicast member report, judge whether to exist multicast member information record with described index information according to the index information in the message, if, then upgrade this record, otherwise, create a new record, comprise multicast address, virtual local area network No., port numbers, source record in the record.
3, method as claimed in claim 2 is characterized in that, the multicast address in the described multicast member report message, virtual local area network No. and port numbers are index information.
4, the method for claim 1 is characterized in that, in described step (a), described multicast member information table upgrades the renewal that described multicast member relation table is triggered in the back, and the renewal of described multicast member relation table comprises:
Search described multicast member relation table respectively with multicast address, VLAN port numbers, each source address, judge whether to exist multicast member relation record with above-mentioned information, if, then upgrade this record, otherwise, a new record created.
5, method as claimed in claim 4, it is characterized in that, after existence has the multicast member relation record of above-mentioned information in judging described multicast member relation table, if judge that again the source address timer is not out of date and source address is effective, then port information is added in the port member tabulation of this record.
6, method as claimed in claim 4 is characterized in that, new record of described establishment is meant that the port that the source address timer is not out of date adds in the record of multicast member relation table correspondence of new establishment.
7, method as claimed in claim 4 is characterized in that, described multicast member relation table regularly detects multicast member relation table after upgrading, and upgrades multicast address, virtual local area network No., port list, source address in the exchanger chip synchronously.
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| CN101729271B (en) * | 2008-10-27 | 2013-06-05 | 华为技术有限公司 | Method, mobile node and system for maintaining state of multicast group member |
| US8619796B2 (en) | 2010-04-22 | 2013-12-31 | International Business Machines Corporation | Forwarding data frames with a distributed fiber channel forwarder |
| US8379642B2 (en) | 2010-04-26 | 2013-02-19 | International Business Machines Corporation | Multicasting using a multitiered distributed virtual bridge hierarchy |
| US8447909B2 (en) | 2010-07-19 | 2013-05-21 | International Business Machines Corporation | Register access in distributed virtual bridge environment |
| CN102325034B (en) * | 2011-05-25 | 2015-03-11 | 太仓市同维电子有限公司 | IGMP/MLD (Internet Group Management Protocol/Multicast Listener Discovery) multicast control protocol-based multicast control system and control method |
| US8891535B2 (en) | 2012-01-18 | 2014-11-18 | International Business Machines Corporation | Managing a global forwarding table in a distributed switch |
| US8861400B2 (en) | 2012-01-18 | 2014-10-14 | International Business Machines Corporation | Requesting multicast membership information in a distributed switch in response to a miss event |
| CN105099721B (en) | 2014-04-28 | 2018-12-07 | 华为技术有限公司 | Safeguard the method and apparatus of multicast member |
| CN104618247B (en) * | 2014-12-30 | 2018-10-26 | 新华三技术有限公司 | A kind of transmission method and device of multicast message |
| CN107070951A (en) * | 2017-05-25 | 2017-08-18 | 北京北信源软件股份有限公司 | A kind of intranet security guard system and method |
| CN109391551B (en) * | 2017-08-14 | 2021-10-12 | 中兴通讯股份有限公司 | Multi-port multicast method, equipment and computer readable storage medium |
| WO2022082825A1 (en) * | 2020-10-23 | 2022-04-28 | 郑州芯兰德网络科技有限公司 | Multicast system and multicast method for identifier resolution-based routing |
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