CN100499583C - Method for realizing simplified IGMP multicast surrogate - Google Patents
Method for realizing simplified IGMP multicast surrogate Download PDFInfo
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- CN100499583C CN100499583C CNB2005101006523A CN200510100652A CN100499583C CN 100499583 C CN100499583 C CN 100499583C CN B2005101006523 A CNB2005101006523 A CN B2005101006523A CN 200510100652 A CN200510100652 A CN 200510100652A CN 100499583 C CN100499583 C CN 100499583C
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Abstract
The present invention relates to numerical information transmission in network technique, especially referring to simplified IGMP multicasting proxy implementation method. It contains host computer transmitting IGMP adding request message requesting connecting preset multicasting group; IGMP multicasting proxy sending said request message to authentication module to make authentication, at the same time checking whether said host computer applied channel already establishment, if it is not establishment then transmitting Said request message to multicasting router requesting said channel; if authentication fail then IGMP multicasting proxy transmitting leaving message to multicasting router. The present invention raises host subscriber switch channel speed, reducing hardware requirement, simplifying software process.
Description
[technical field]
The present invention relates to the transmission of digital information in the network technology, particularly a kind of IGMP multicast agent implementation method of simplification.
[background technology]
IGMP (IGMP) agreement run on main frame and with multicast router that main frame directly links to each other between, be that the IP main frame is used for reporting the multi-address broadcast group membership agreement of identity.By the IGMP agreement, main frame can wish to add and receive the information of certain particular multicast group by IGMP notice of settlement local router on the one hand; On the other hand, whether the router member that periodically inquires about certain known group in the local area network (LAN) by the IGMP agreement is in active state.The main effect of IGMP agreement is the problem that solves occupied bandwidth when broadcasting on the network.In network, when sending broadcast message for all clients, the exchange opportunity of supporting IGMP with broadcast message without issuing all clients with filtering, but these information only need be transferred to the client of some parts by multicast mode, in a large number conserve network bandwidth, reduction offered load.
Multicast is a kind of message to be mail to a plurality of recipients' communication mode, has realized that the IP network mid point transmits to the efficient data of multiple spot, in a large number conserve network bandwidth, reduction offered load.In many application, it is better than broadcasting, because multicast has reduced the burden that does not participate in the main frame of communicating by letter.Simple IGMP agreement is the basic module of multicast.Multicasting technology comprises: aspects such as address assignment, group membership management, multicast message forwarding, route foundation, reliability.The present invention relates to group membership management, promptly set up the group membership's relation information in the direct connection network segment in router and switch, specifically, is exactly the member which multicast group is arranged under which interface, the channel that each member watches.
Router mainly is the function that requestor and control multicast data flow issue.IGMP has the requestor election mechanism.The IGMP router of lowest unicast IP address is elected as requestor.All IGMP router initialization oneself are requestor " Querier ", in case receive on the same network segment one from the inquiry of lower IP address it just abandons own role " Non-Querier " as requestor.Query message is divided into two kinds, usually inquiry (GeneralQuery) and designated groups inquiry (Group-specific Query); The designated groups inquiry writes on the group address that will inquire about in the group address territory.When the member receives query message, will start the timer of a value at (0 ~ maximum response time).During timer clocked, if receive an inquiry from router again, the maximum response time of this inquiry that and if only if was reset during less than the value of present timing device.Router is received response message, with the group address adding tabulation of report, and sets timer (Group Membership Interval), and the response message of repetition is with the replacement revaluate, if this is worth after date, does not receive response message yet, thinks that then this group lost efficacy.
DSLAM, promptly Digital Subscriber Line Access Multiplexer is a physical entity of realizing IGMP multicast agent (PROXY); IGMP multicast agent (PROXY) then is the part of DSLAM software function.
IGMP PROXY (multicast agent) agreement need be finished following function:
(1) IGMP that receives the member asks, and sets up group membership's relation;
(2) IGMP that receives the member leaves, and confirms by group-specific query whether the user has left this group, and revises group membership's relation;
(3), regularly member port is carried out general query, the craft personal relation as requestor;
(4) as the member of upper strata router, to send the IGMP request when needing certain group, request adds this group, sends IGMP when leaving and leaves, and the notice router is from this group deletion oneself, the general polling of response upper strata router, the own multicast group that is added of report.
In the existing multicasting technology, main frame transmission IGMP joins request after the predetermined multicast group of message request connection, at first need to carry out authentication, just begin application then and set up the channel connection, just can receive this multicast traffic stream (as shown in Figure 1) after the success of application channel, the time delay that causes the member to add like this is long.
The shortcoming of prior art also comprises:
1, requires switching net can support the L3 function, support the IGMP agreement to capture host CPU, and can realize the chip price costliness of these functions, and the software work amount is bigger than normal, having relatively high expectations to CPU;
2, to realize above standard I GMPPROXY four big functions, software processes flow process complexity;
3, for the many members multichannel under the DSLAM (Digital Subscriber Line Access Multiplexer), CPU will handle a large amount of messages in real time, take a large amount of cpu resources, CPU is had relatively high expectations, be difficult to guarantee the promptness handled simultaneously, can increase cost if improve cpu performance, if do not improve cpu performance then can reduce user's processing of request speed and concurrent user are asked treating number.
[summary of the invention]
The object of the present invention is to provide a kind of IGMP multicast agent implementation method of simplification, can overcome defective of the prior art.
The technical solution adopted for the present invention to solve the technical problems is: a kind of IGMP multicast agent implementation method of simplification comprises step:
101, main frame sends the IGMP message request that joins request and connects predetermined multicast group;
102, the IGMP multicast agent is delivered to authentication module with this request message and is carried out authentication, checks simultaneously whether the channel that this main frame is applied for is set up, if also do not set up, then this request message is forwarded to this channel of multicast router request;
103, if failed authentication, the IGMP multicast agent is checked the online number of members of described main frame place channel, if described main frame is last member of this channel, then sends leave message to multicast router; Otherwise the IGMP multicast agent is deleted described host subscriber, and refreshes the online information about firms of this channel.
In the step 102, if the channel that described main frame is applied for is set up, then router directly abandons this request message, no longer is forwarded to multicast router.
Further comprise after the step 103: after the IGMP multicast agent is received leave message from main frame, check the online number of members of main frame place channel, if described main frame is last member of this channel, then this leave message is forwarded to multicast router, this multicast data flow of request deletion; Otherwise the IGMP multicast agent is deleted this host subscriber, and refreshes the online information about firms of this channel.
As an improvement of the present invention, the inventive method further comprises step: the IGMP multicast agent increases channel and reports device, reports interval T every one section, and described channel reports the device channel that all are online to report multicast router.
Wherein, the IGMP multicast agent directly abandons the query message that multicast router sends over.
The IGMP multicast agent starts a timer, calculates the time point that reports of each current line channel by the line channel number, reports a channel time of advent when putting, and arrives to report to recomputate new line channel again after the interval T and report time point.
Describedly report reporting message to be evenly distributed on to report in the interval T and reporting of channel in the interval T.
As an improvement of the present invention, the described polling interval that reports interval T less than multicast router.
Described authentication module is positioned at that DSLAM (Digital Subscriber Line Access Multiplexer) goes up, on the outside webmaster or on the system journal SYSLOG equipment.
The beneficial effect that technical solution of the present invention is brought is: 1. host subscriber's authentication process, multicast router application multicast data flow is parallel processing to the upper strata, improves the speed of host subscriber's switching channels.2. simplified report device funtion part as upper strata multicast router member, descending query message directly abandons at hardware, is not transparent to the host subscriber, and CPU does not handle, alleviated the processing burden of software and user side, by offering group membership's relation of keeping on the router in the active.3. adopted particular algorithm, the even branch of message that reports of a plurality of channels reports interval T to report, and has reduced the message burstiness and to the impact of multicast router.4. the present invention is guaranteeing under the situation that IGMP PROXY function realizes, simplified the IGMP PROXY handling process of standard, reduced the complexity of software processes, no longer require switching net to support the L3 function, promptly do not need switching net that descending IGMP agreement is captured host CPU, reduce the processing load of CPU, thereby reduced hardware requirement, simplified the software processes flow process.In sum, the present invention is when satisfying the requirement of IGMP PROXY protocol processes fully, and it is succinct stable to make software realize, low to the cpu performance requirement, hardware cost is low.
[description of drawings]
Fig. 1 is the canonical system working mode figure of group membership management in the prior art;
Fig. 2 is the process chart that the user adds multicast group among the present invention;
Fig. 3 is the process chart that the user leaves multicast group among the present invention;
Fig. 4 is the system works ideograph of group membership management in the inventive method.
[embodiment]
Below in conjunction with specific embodiment the inventive method is further elaborated.
The user adds the process chart of multicast group in the embodiments of the invention shown in Figure 2.
At first, main frame sends the IGMP message request that joins request and connects predetermined multicast group: after the user opened a group broadcasting video frequency, main frame sent IGMP message that joins request.
The IGMP multicast agent captures this IGMP and joins request behind the message, only delivers to software processes.A large number of users under a large amount of DSLAM (Digital Subscriber Line Access Multiplexer) directly is transparent to the upper strata multicast router to separately IGMP request message simultaneously, increased the burden of multicast router, the IGMP multicast agent does not need that again user's IGMP request message is copied into two parts and transmits wherein portion then to top network.
The IGMP multicast agent is delivered to authentication module with this request message and is carried out authentication, and whether detect this module legal, and whether the channel of checking this host subscriber simultaneously and being applied for is set up.If set up, then this request message is directly abandoned, issuing message joins this multicast data flow PVC (permanent virtual connection) with this host subscriber, makes this user can receive this multicast traffic stream; If also do not set up, then this request message is forwarded to this channel of multicast router request, create multicast PVC, the request multicast router is delivered to DSLAM with this multicast data flow, and the host subscriber is joined in the multicast PVC of new application.Wherein, authentication module can be positioned on the DSLAM, or on the outside webmaster, perhaps on the SYSLOG equipment.
If this subscription authentication failure (user is illegal), the IGMP multicast agent is checked the online number of members of this main frame place channel, if described main frame is last member of this channel, then sends leave message to multicast router, the deletion multicast data flow; Otherwise the IGMP multicast agent is deleted this host subscriber, and refreshes the online information about firms of this channel.Like this, authentication process be parallel processing to upper strata multicast router application multicast data flow, rather than the method for serial process, i.e. subscription authentication and application multicast data flow are carried out simultaneously, have effectively reduced the time delay that the member adds.
Shown in Figure 3 is in the embodiments of the invention, and the user leaves the process chart of multicast group.
After DSLAM receives leave message from main frame, check the online number of members of main frame place channel,, then this leave message is forwarded to multicast router, this multicast data flow of request deletion if described main frame is last member of this channel; Otherwise DSLAM deletes this host subscriber, and refreshes the online information about firms of this channel.
The present invention has simplified the report device funtion part as upper strata multicast router member, descending query message directly abandons at hardware, be not transparent to the host subscriber, CPU does not handle, alleviated the processing burden of software and user side, by offering group membership's relation of keeping on the router in the active, as shown in Figure 4.Be that the IGMP multicast agent increases channel and reports device, report interval T, channel to report the device channel that all are online to report multicast router every one section, prevent that the upper strata multicast router from thinking that channel is aging and having stopped the forwarding of group broadcasting program.Simultaneously, in order to reduce the burstiness that reports the multicast router message, to report message to be dispersed in the unsolicited report interval, implementation method is as follows: timer of system start-up, calculate the time point that reports of each current line channel by the line channel number, report a channel time of advent when putting, recomputate new line channel again when arrival reports interval T and report time point.Wherein, report interval T to be less than the polling interval of router, like this, it is aging that channel is unlikely to, and the while can not report overstocked yet, causes the overload of multicast router.
Claims (9)
1, a kind of IGMP multicast agent implementation method of simplification is characterized in that: comprise step
101, main frame sends the IGMP message request that joins request and connects predetermined multicast group;
102, the IGMP multicast agent is delivered to authentication module with this request message and is carried out authentication, checks simultaneously whether the channel that this main frame is applied for is set up, if also do not set up, then this request message is forwarded to this channel of multicast router request;
103, if failed authentication, the IGMP multicast agent is checked the online number of members of described main frame place channel, if described main frame is last member of this channel, then sends leave message to multicast router; Otherwise the IGMP multicast agent is deleted described host subscriber, and refreshes the online information about firms of this channel.
2, method according to claim 1, it is characterized in that: in the step 102, if the channel that described main frame is applied for is set up, then the IGMP multicast agent directly abandons this request message, no longer be forwarded to multicast router, only refresh the online information about firms of this channel.
3, method according to claim 1 and 2, it is characterized in that further comprising after the step 103: after the IGMP multicast agent is received leave message from main frame, check the online number of members of main frame place channel, if described main frame is last member of this channel, then this leave message is forwarded to multicast router, this multicast data flow of request deletion; Otherwise the IGMP multicast agent is deleted this host subscriber, and refreshes the online information about firms of this channel.
4, method according to claim 1 is characterized in that further comprising step: the IGMP multicast agent increases channel and reports device, reports interval T every one section, and described channel reports the device channel that all are online to report multicast router.
5, method according to claim 4 is characterized in that: the IGMP multicast agent directly abandons the query message that multicast router sends over.
6, method according to claim 4, it is characterized in that: the IGMP multicast agent starts a timer, calculate the time point that reports of each current line channel by the line channel number, report a channel time of advent when putting, arrive to report and recomputate new line channel again after the interval T and report time point.
7, according to claim 4,5 or 6 described methods, it is characterized in that: the described polling interval that reports interval T less than multicast router.
8, according to claim 4,5 or 6 described methods, it is characterized in that: describedly report reporting message to be evenly distributed on to report in the interval T and reporting of channel in the interval T.
9, method according to claim 1 is characterized in that: described authentication module is positioned on Digital Subscriber Line Access Multiplexer DSLAM, the outside webmaster or on the system journal SYSLOG equipment.
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| CNB2005101006523A CN100499583C (en) | 2005-10-20 | 2005-10-20 | Method for realizing simplified IGMP multicast surrogate |
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| CN100499583C true CN100499583C (en) | 2009-06-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3057263A4 (en) * | 2013-10-08 | 2016-11-23 | Zte Corp | Multicast message response method and device |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101442419B (en) * | 2007-11-21 | 2010-12-08 | 华为技术有限公司 | Method for determining multicast proxy node, multicast method, equipment and system |
| CN101222425B (en) * | 2008-01-22 | 2010-07-07 | 华为技术有限公司 | Multicast forwarding method and multicast router |
| CN101534206B (en) * | 2008-03-13 | 2011-12-21 | 华为技术有限公司 | Method and system for realizing multicast agent |
| EP2400692A4 (en) * | 2009-02-27 | 2012-07-04 | Huawei Tech Co Ltd | Method, terminal device and channel switching server for processing abnormality in channel switching |
| CN104079418B (en) * | 2014-05-28 | 2018-07-31 | 上海斐讯数据通信技术有限公司 | A kind of processing method of simplified multicast message |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3057263A4 (en) * | 2013-10-08 | 2016-11-23 | Zte Corp | Multicast message response method and device |
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