CN102970152A - Method for statically realizing Internet group management protocol (IGMP) Snooping - Google Patents
Method for statically realizing Internet group management protocol (IGMP) Snooping Download PDFInfo
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- CN102970152A CN102970152A CN201210485652XA CN201210485652A CN102970152A CN 102970152 A CN102970152 A CN 102970152A CN 201210485652X A CN201210485652X A CN 201210485652XA CN 201210485652 A CN201210485652 A CN 201210485652A CN 102970152 A CN102970152 A CN 102970152A
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Abstract
The invention provides a method for statically realizing Internet group management protocol (IGMP) Snooping. The method comprises the following steps of: constructing a multicast table with a fixed size, wherein each option comprises multicast multi-access control (MAC), source MAC, a port number, a virtual local area network (vlan) identity (ID) and aging time, wherein the primary value of the aging time is 300 seconds; when customer promise equipment (CPE) receives a message that an IGMP is added, and the existing corresponding options are searched, updating the aging time of the options to be 300 seconds if the corresponding options are not searched, adding the corresponding options into the multicast group, and setting the aging time as the primary value; when the CPE receives a message that the IGMP leaves, searching whether the corresponding options exist in the multicast table, and if the corresponding options are searched, deleting the options. By the method, the multicast group with the fixed size only occupies a fixed space, and a certain option is added into and/or deleted from the multicast table with the fixed size. Compared with the prior art, the method has the advantages that extra memory space is not occupied, and the memory space can be frequently released; and therefore, fragments of the memory can be avoided.
Description
[technical field]
The present invention relates to the network data communication technical field, relate in particular to the method for configuration multicast table in a kind of IGMP Snooping agreement.
[background technology]
IGMP Snooping is Internet Group Management Protocol Snooping(internet group management protocol snooping) abbreviation, it is the multicast tied mechanism that operates on the two-layer equipment, is used for management and control multicast group.When two-layer equipment did not move IGMP Snooping, multicast packet was broadcasted at two layers; After two-layer equipment had moved IGMP Snooping, the multicast packet of known multicast group can not be broadcasted at two layers, and at two layers by the recipient of multicast to appointment.
The two-layer equipment of operation IGMP Snooping is by analyzing the IGMP message of receiving, for port and multicast mac address are set up mapping relations, and sets up and maintenance software is transmitted and according to the forwarding-table item multicast data forwarding according to such mapping relations.List item in the software forward table has multicast mac address, source MAC, VLAN ID, port bitmap etc.
At present, some CPE(CPE:Customer Premise Equipment, be physically located at the hardware of client layer, comprise modulator-demodulator, hub, switch, router) on be to realize IGMP snooping function with software register, use dynamic approach to create and remove entries, when receiving that IGMP joins message, take software list item of the instant establishment of memory headroom of CPU, when receiving IGMP leave message, then leave out this list item, discharge simultaneously occupied memory headroom.Use this dynamic approach to create and deletion software list item, distribute continually and releasing memory, cause easily the generation of memory fragmentation.
[summary of the invention]
The technical problem that the present invention need solve is to overcome above-mentioned deficiency, and the method for a kind of static IGMPSnooping of realization is provided.
For solving above-mentioned technical problem, the present invention has designed the method for a kind of static IGMP of realization Snooping, it is characterized in that, comprises following step:
Step 1: set up the multicast table of a fixed size in the CPE internal memory, multicast table comprises N item list item, N〉5, each list item comprises multicast MAC, source MAC, port numbers, vlan ID, ageing time, the ageing time initial value is 300s;
Step 2: when CPE receives that IGMP joins message, record multicast MAC, source MAC, port numbers, vlan ID, and in multicast table, search whether have corresponding list item, if in multicast table, find existing corresponding list item, the ageing time of then upgrading this list item is 300s, if in multicast table, search less than corresponding list item, then corresponding list item is added in the multicast table, and to dispose its ageing time be initial value;
Step 3: when CPE receives IGMP leave message, record multicast MAC, source MAC, port numbers, vlan ID, and search whether have corresponding list item in multicast table, find corresponding list item, then delete this list item.
Further improve as the present invention, the method has also created a time timer, refresh multicast table every 10s, and the ageing time of each list item cut 10s, whether the ageing time of judging again each list item is 0, if the ageing time of certain list item is 0, then deletes this list item, otherwise, then keep this list item.
Further improve as the present invention, N is 512.
The present invention sets up the multicast table of a fixed size, only accounts for fixing space of internal memory, and adds in the multicast table of this fixed size and/or leave out certain list item.Compared with prior art, the outer memory headroom of occupying volume and discharge continually extra memory headroom no longer, thus avoided the generation memory fragmentation.
[description of drawings]
Fig. 1 is the schematic flow sheet of the method for the static IGMP of realization of embodiment of the invention Snooping;
Fig. 2 is the illustrative flow chart of embodiment of the invention time timer.
[embodiment]
The invention will be further described below in conjunction with drawings and embodiments.
The method that embodiments of the invention are static realizes IGMP Snooping is to operate in the Ethernet on the modulator-demodulator, and certainly, the static method of IGMP Snooping that realizes of the present invention also may operate on the network equipments such as switch, router, hub.Switch, router, hub, modulator-demodulator are referred to as again CPE.
As shown in Figure 1, present embodiment, the static method of IGMP Snooping that realizes comprises: set up the multicast table of a fixed size in the modulator-demodulator internal memory, namely take the space of a fixed size of modulator-demodulator internal memory, create the multicast table of a fixed size.Present embodiment only adds in the multicast table of this fixed size and/or leaves out list item (being the multicast forwarding list item), no longer goes to additionally to take or discharge the space of other internal memories, and it is static being equivalent to this part shared memory headroom of big or small multicast table that is fixed.
In the present embodiment, multicast table comprises 512 list items, and 512 enough modulator-demodulators of list item move IGMP Snooping agreement when multicast.Certainly, what list items the present embodiment multicast table comprises, and are relevant with its space, if when multicast table created, its space was large, the quantity of list item is then many, and its space is little, and the quantity of list item is then few, and still, the list item quantity of multicast table should be less greater than 5.
Each list item of multicast table comprises multicast MAC, source MAC, port numbers, vlan ID, ageing time.The ageing time initial value is 300s.
When modulator-demodulator is received user's IGMP message, if IGMP joins message, then record multicast MAC, source MAC, port numbers, vlan ID, and in multicast table, search whether have corresponding list item.
If in multicast table, find existing corresponding list item, illustrate that this multicast member is online, the ageing time of upgrading this list item is 300s.
If search less than corresponding list item, then corresponding list item is added in the multicast table, and to dispose its ageing time be initial value, illustrate that namely this member is new multicast member, there is not corresponding list item in the multicast table before, add fashionablely, will be added in the multicast table with its multicast MAC, source MAC, port numbers, the corresponding list item of vlan ID, generate a new list item.
When if modulator-demodulator is received IGMP leave message, record multicast MAC, source MAC, port numbers, vlan ID, and in multicast table, search whether have corresponding list item, find corresponding list item, then delete this list item.
Whether the present invention is online or disconnect in order to monitor multicast member, also created a time timer, as shown in Figure 2, refreshes multicast table every 10s, and the ageing time of each list item is cut 10s, judges whether the ageing time of each list item is 0 again.If the ageing time of certain list item is 0, illustrate that then this multicast member disconnects, do not send IGMP always and join message, its ageing time is cut 10s every 10s, is 0 until cut, and then deletes this list item.
If the ageing time of certain list item is not 0, then keep this list item.Illustrate that this multicast member is online, when multicast member joined message to modulator-demodulator transmission IGMP, the ageing time in its list item was constantly updated and is 300s.
The present invention sets up the multicast table of a fixed size, only account for fixing space of internal memory, and in the multicast table of this fixed size, add and/or leave out certain list item, the outer memory headroom of occupying volume and discharge continually extra memory headroom no longer, thus avoided the generation memory fragmentation.
Above-described only is embodiments of the present invention, should be pointed out that for the person of ordinary skill of the art at this, under the prerequisite that does not break away from the invention design, can also make improvement, but these all belongs to protection scope of the present invention.
Claims (3)
1. a static method that realizes IGMP Snooping is characterized in that, comprises following step:
Step 1: set up the multicast table of a fixed size in the CPE internal memory, multicast table comprises N item list item, N〉5, each list item comprises multicast MAC, source MAC, port numbers, vlan ID, ageing time, the ageing time initial value is 300s;
Step 2: when CPE receives that IGMP joins message, record multicast MAC, source MAC, port numbers, vlan ID, and in multicast table, search whether have corresponding list item, if in multicast table, find existing corresponding list item, the ageing time of then upgrading this list item is 300s, if in multicast table, search less than corresponding list item, then corresponding list item is added in the multicast table, and to dispose its ageing time be initial value;
Step 3: when CPE receives IGMP leave message, record multicast MAC, source MAC, port numbers, vlan ID, and search whether have corresponding list item in multicast table, find corresponding list item, then delete this list item.
2. static state according to claim 1 realizes the method for IGMP Snooping, it is characterized in that: the method has also created a time timer, refresh multicast table every 10s, and the ageing time of each list item cut 10s, whether the ageing time of judging again each list item is 0, if the ageing time of certain list item is 0, then deletes this list item, otherwise, then keep this list item.
3. static state according to claim 1 realizes the method for IGMP Snooping, and it is characterized in that: N is 512.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103618614B (en) * | 2013-11-13 | 2016-08-24 | 深圳市新格林耐特通信技术有限公司 | A kind of method strengthening the study restriction of IGMP Snooping multicast |
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Application publication date: 20130313 |