CN100372292C - Method for making multicast accurate to terminal in three-layer switchboard - Google Patents
Method for making multicast accurate to terminal in three-layer switchboard Download PDFInfo
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- CN100372292C CN100372292C CNB031532519A CN03153251A CN100372292C CN 100372292 C CN100372292 C CN 100372292C CN B031532519 A CNB031532519 A CN B031532519A CN 03153251 A CN03153251 A CN 03153251A CN 100372292 C CN100372292 C CN 100372292C
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Abstract
The present invention provides a method for realizing multicast accurate to ports on a three-layer switchboard, namely that a main inquirer of an IGMP and a DR of a PIM are arranged on the same switchboard during network configuration; the port of the main inquirer is determined, and every IGMP agent switchboard obtains the port. When the switchboard receives an REPORT message transmitted by a main station, the REPORT message is cut to a protocol layer and the forwarding of the REPORT message is stopped. If the switchboard is not the DR, a port which receives the REPORT message is recorded, and simultaneously a member increasing report is forwarded to the DR through the port of the main inquirer. If the switchboard is the DR, the member increasing report is directly given to a PIM protocol layer, and simultaneously the port which receives the REPORT message is recorded and is marked as a group member port. When a multicast data message reaches, the forwarding accurate to the ports can be realized. The present invention is added with one kind of agent on the original IGMP protocol and can overcome a defect caused by the REPORT inhibition of the IGMP on the three-layer switchboard.
Description
Technical field:
The invention belongs to the multicast correlative technology field in the network service, relate in particular to and realize that multicast is accurate to the retransmission method of port.
Background technology:
At present,, mainly also be based on the multicast of interface, that is to say, in a virtual lan (VLAN) territory, broadcast in this territory and to achieve the goal in the multicast field.
In Internet Group Management Protocol (IGMP) realization, a characteristic is arranged: if a user receives some group IGMP report message (IGMP REPORT message), just no longer send IGMP REPORT message, this characteristic is called " REPORT inhibition " on agreement, therefore, do not overcome this characteristic, can't realize being accurate to the forwarding of port, and on agreement, overcome this characteristic, just can only be to allow the REPORT message not transmit, but directly receive protocol layer.So-called IGMP REPORT message, main purpose are which multicast group main frame (HOST) oneself belongs to the multicast router report.
At present, stoping the realization of broadcasting in the territory is to realize guaranteeing IGMP SNOOPING or other agreement can be accurate to port on two-layer equipment on Layer 2 switch.
But at 3 layer switch, if the REPORT message is grabbed up, do not allow it transmit, to bring a critical defect, in network environment shown in Figure 1, main frame host and port e1, e2, e3 are in same VLAN, and e1 place switch 1 enables PIM (Protocol Independent Multicast agreement) and IGMP simultaneously with e3 place switch 2, but e3 place switch is DR (Designated Router).Switch 1 realizes that IGMP is accurate to port, switch 2 also realizes being accurate to port, but switch 2 is the DR of PIM, switch 1 has connected subscriber's main station host, and at this moment, user's REPORT message is intercepted and captured by switch 1, directly deliver to protocol layer, and do not allow this message transmit, but because switch 1 itself is not the DR of PIM, therefore, in fact, 1 pair of this message of switch is can not add by report of user, and simultaneously, DR is not owing to receive the REPORT message yet, therefore, can not add this user, so this user incites somebody to action forever can't program request yet!
Summary of the invention:
The objective of the invention is increases a kind of agency's method on original IGMP agreement, thereby can be on 3 layer switch, and the REPORT that overcomes IGMP suppresses the defective brought, realizes being accurate to the forwarding of port.
Technical scheme of the present invention is as follows:
Realize on the three-tier switch that multicast is accurate to the method that port is transmitted, be called the igmp proxy method, may further comprise the steps:
1. during network configuration, the main requestor of IGMP and the DR of PIM are located on the same switch.
2. determine the port at main requestor place, other each igmp proxy switches obtain the port at main requestor place.
3. main requestor sends igmp querying message (IGMP QUERY message) to each igmp proxy switch, and the igmp proxy switch is received this message, and all of the port beyond inbound port is transmitted this QUERY message.
4. when some ports of switch are received the REPORT message that subscriber's main station sends, intercept protocol layer, do not allow this message transmit; Whether switch inspection oneself is DR in the multicast group shown in this REPORT message, and by the IGMP agreement this REPORT message is carried out following processing:
If it oneself is not DR that check result is found, then the port of REPORT message received in record, simultaneously this member increased report and transmit to DR by the port at main requestor place, by DR the member increased report and give PIM protocol layer;
If it oneself is DR that check result is found, then directly the member is increased report and give PIM protocol layer, the port of REPORT message received in record simultaneously, and be labeled as group membership's port;
5. when multicast data message arrives, can be accurate to port in the following manner transmits: multicast data message arrives DR, be forwarded to the IGMP switch by group membership's port, after data message arrived subordinate's switch, the port of receiving the REPORT message that subordinate's switch passes through to be write down again was forwarded to subscriber's main station.
Advantage of the present invention and good effect:
The present invention increases a kind of agency on original IGMP agreement, thereby can be on three-tier switch, and the REPORT that overcomes IGMP suppresses the defective brought, and multicast more easily realizes being accurate to port.Under the switch that haves three layers situation on the scene, conserve bandwidth better simultaneously, owing to can be accurate to port on three-tier switch, can overcome the charging defective that multicast and broadcast in the past causes, and can charge at the user.
Description of drawings:
Fig. 1 is a three-tier switch group network system schematic block diagram;
Fig. 2 is accurate to the schematic diagram that port is transmitted;
Fig. 3 is the process chart of igmp proxy method of the present invention.
Embodiment:
According to technical scheme of the present invention, the example procedure an of the inventive method is described:
As shown in Figure 3, realize on the three-tier switch that multicast is accurate to the method that port is transmitted, may further comprise the steps:
1. network configuration is located at the main requestor of IGMP and the DR of PIM on the same switch.
2. determine the port at main requestor place, other each igmp proxy switches obtain the port at main requestor place.Can be divided into following two kinds of situations:
If have only a switch operation IGMP and PIM in the network, when then in step 1, carrying out network configuration, specify main requestor port simultaneously, each igmp proxy switch directly writes down main requestor place port.
If there are many switches to move IGMP and PIM simultaneously in the network, then PIM campaigns for out DR by competition; IGMP campaigns for out IGMP master's requestor by competition.According to agreement, PIM can specify DR, and makes the priority of DR; For IGMP, in the V1 version, if this switch be DR then will control oneself and think main requestor, then be to campaign in the V2 version according to the IP address, the little person in IP address is the inquiry.The process that each IGMP switch participates in the main requestor of election contest acquisition place port is as follows: at first giving tacit consent to oneself is that DR (does not then have router port this moment, directly the REPORT message being delivered to the PIM layer handles), if receive the QUERY message of an IGMP, write down this port, then the IP address of this QUERY message and the IP address of DR are compared, if find the IP address of the IP address of new QUERY message demonstration less than DR, think that then the switch at place, IP address of new QUERY message is DR, the address of changing DR is new IP address, and renewal DR place port is a QUERY message place port.The election contest process also can be finished in following step 3 simultaneously.
3. main requestor sends igmp querying message (IGMP QUERY message) to each igmp proxy switch, and the igmp proxy switch is received this message, and all of the port beyond inbound port is transmitted this QUERY message.Main requestor sends the QUERY message, and main purpose is for allowing All hosts can both receive query message, thereby allows main frame receive response in time after this query message, and sends REPORT message (if this main frame belongs to certain multicast group really).
In this step, also can finish each IGMP switch election contest simultaneously to obtain the process of main requestor place port.
4. when some ports of switch are received the REPORT message that subscriber's main station sends, intercept protocol layer, do not allow this message transmit; Whether switch inspection oneself is DR in the multicast group shown in this REPORT message, and by the IGMP agreement this REPORT message is carried out following processing:
If it oneself is not DR that check result is found, then the port (PORTLISTNN) of REPORT message received in record, simultaneously this member increased report and transmit to DR by the port at main requestor place, by DR the member increased report and give PIM protocol layer;
If it oneself is DR that check result is found, then directly the member is increased report and give PIM protocol layer, the port (PORTLISTDR) of REPORT message received in record simultaneously, and be labeled as group membership's port;
5. when multicast data message arrives, can be accurate to port in the following manner transmits: multicast data message arrives DR, (PORTLISTDR) is forwarded to the IGMP switch by group membership's port, after data message arrived subordinate's switch, the port of receiving the REPORT message (PORTLISTNN) that subordinate's switch passes through to be write down again was forwarded to subscriber's main station.
Fig. 2 shows the example of a concrete precise relay.In Fig. 2, e1 is a DR place port, and promptly main requestor place port, e2, e4 are REPORT message place port (being group membership's port), and e3 is non-multicast group member port.E1, e2, e3, e4 are at same VLAN, this switch has started IGMP, at this moment, and, it is the port at a certain multicast member place that IGMP has write down e2, e4, and e1 is the port that multicast traffic stream enters, when e1 port data stream flows into, switch can carry out precise relay according to the e2 that is write down, e4 port, and the user at e3 port place will can not receive these data this moment.
Claims (4)
1. realize on the three-tier switch that multicast is accurate to the method for the forwarding of port, is characterized in that may further comprise the steps:
(1) during network configuration, the main requestor of IGMP and the DR of PIM are located on the same switch;
(2) determine the port at main requestor place, other each igmp proxy switches obtain the port at main requestor place;
(3) main requestor sends the QUERY message to each igmp proxy switch, and the igmp proxy switch is received this message, and all of the port beyond inbound port is transmitted this QUERY message;
(4) when some ports of switch are received the REPORT message that subscriber's main station sends, intercept protocol layer, do not allow this message transmit; Whether switch inspection oneself is DR in the multicast group shown in this REPORT message, and by the IGMP agreement this REPORT message is carried out following processing:
If it oneself is not DR that check result is found, then the port of REPORT message received in record, simultaneously this member increased report and transmit to DR by the port at main requestor place, by DR the member increased report and give PIM protocol layer;
If it oneself is DR that check result is found, then directly the member is increased report and give PIM protocol layer, the port of REPORT message received in record simultaneously, and be labeled as group membership's port;
(5) when multicast data message arrives, can be accurate to port in the following manner transmits: multicast data message arrives DR, be forwarded to the igmp proxy switch according to group membership's port, data message is forwarded to subscriber's main station by the port of receiving the REPORT message that proxy switch write down after arriving proxy switch again.
2. realize on the three-tier switch as claimed in claim 1 that multicast is accurate to the method for the forwarding of port, it is characterized in that, each igmp proxy switch obtains the mode of the port at main requestor place and is in the described step (2): specify the port at main requestor place when carrying out network configuration in step (1), the specified main requestor place port of each igmp proxy switch record.
3. realize on the three-tier switch as claimed in claim 1 that multicast is accurate to the method for the forwarding of port, it is characterized in that, each igmp proxy switch obtains the mode of the port at main requestor place and is in the described step (2): each IGMP switch is by election contest, campaign for out main requestor, other each igmp proxy switches obtain main requestor place port.
4. realize on the three-tier switch as claimed in claim 3 that multicast is accurate to the method for the forwarding of port, it is characterized in that, the process that described each IGMP switch is campaigned for main requestor is as follows: at first giving tacit consent to oneself is DR, if receive the QUERY message of an IGMP, write down this port, then the IP address of this QUERY message and the IP address of DR are compared, if find the IP address of the IP address of new QUERY message demonstration less than DR, think that then the switch at place, IP address of new QUERY message is DR, the address of changing DR is new IP address, and renewal DR place port is a QUERY message place port.
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| CNB031532519A CN100372292C (en) | 2003-08-11 | 2003-08-11 | Method for making multicast accurate to terminal in three-layer switchboard |
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| CN100372292C true CN100372292C (en) | 2008-02-27 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417139C (en) * | 2005-12-01 | 2008-09-03 | 华为技术有限公司 | Method for multicast data uninterrupted repeat |
| CN100442776C (en) * | 2005-12-06 | 2008-12-10 | 杭州华三通信技术有限公司 | Method for realizing multicast translation in three-layer switching unit |
| KR100656487B1 (en) * | 2006-01-17 | 2006-12-11 | 삼성전자주식회사 | Internet group membership protocol network device and signal process control method in digital broadcasting system thereof |
| 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 |
| CN1925468B (en) * | 2006-09-27 | 2010-05-19 | 华为技术有限公司 | Internet set managerial protocol report inhibiting method and communications network system |
| EP2234344B1 (en) * | 2008-01-09 | 2013-02-27 | Huawei Technologies Co., Ltd. | Methods, system and routers for realizing switching between layer-2 and layer-3 multicast route tracing |
| CN101594288B (en) | 2008-05-28 | 2013-03-20 | 华为技术有限公司 | Query facility selecting method, router and network system |
| CN101610200B (en) * | 2008-06-19 | 2012-04-04 | 华为技术有限公司 | Switching method and device of multicast routing |
| CN103179599B (en) * | 2011-12-26 | 2016-01-27 | 中国移动通信集团河北有限公司 | The method for supervising of WLAN performance, equipment and system |
| CN102801632A (en) * | 2012-08-28 | 2012-11-28 | 盛科网络（苏州）有限公司 | Unified electoral method of PIM-SM (Protocol Independent Multicast-Sparse Mode) designated router and IGMP (Internet Group Management Protocol) querier |
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Patent Citations (5)
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| JPS6384158A (en) * | 1986-09-29 | 1988-04-14 | Nec Corp | Semiconductor integrated circuit switch |
| US6058429A (en) * | 1995-12-08 | 2000-05-02 | Nortel Networks Corporation | Method and apparatus for forwarding traffic between locality attached networks using level 3 addressing information |
| WO2000056013A2 (en) * | 1999-03-17 | 2000-09-21 | Broadcom Corporation | Method for avoiding out-of-ordering of frames in a network switch |
| AU2137201A (en) * | 1999-12-28 | 2001-07-09 | Mosaid Technologies Incorporated | Forward overrides in a packet switch |
| CN1402487A (en) * | 2002-10-14 | 2003-03-12 | 北京港湾网络有限公司 | Method for optimazed configuration of third layer exchange chip of network exchange apparatus |
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