WO2012041080A1

WO2012041080A1 - Method and system for adjusting ageing time, and modem

Info

Publication number: WO2012041080A1
Application number: PCT/CN2011/076052
Authority: WO
Inventors: 唐剑波
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-09-30
Filing date: 2011-06-21
Publication date: 2012-04-05
Also published as: CN102064956A; CN102064956B

Abstract

The present invention discloses a method and system for adjusting ageing time, and a modem. The method for adjusting ageing time includes that: a modem receives query messages from an upper connection apparatus; the modem monitors a time interval between two continuous query messages; and the modem takes the time interval as ageing time. With the present invention, automatic adjustment of ageing time of a modem can be realized simply and conveniently.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method, system, and modem for adjusting an aging time. BACKGROUND OF THE INVENTION At present, modem (modem) processing of multicast is mainly performed in the following two ways: an Internet Group Management Protocol (IGMP) proxy and an IGMP snooping (IGMP snooping) technology, wherein IGMP Snooping is relatively simple. Mainly working at the link layer, it listens to IGMP messages between the client and the router to establish a multicast table entry for a multicast. The multicast table entry includes the multicast address and the physical address. The mapping between a port and a virtual local area network (VLAN). By using IGMP Snooping, you can establish a multicast table on a Layer 2 switching device that does not support IGMP. This saves bandwidth and controls the forwarding direction of multicast packets. In the modem bridge mode, the following methods are used to implement the multicast mechanism: In step S1, when the IGMP general query message is received from the uplink port, the 4艮 text is directly forwarded on all the lan ports. Step S2: When receiving the IGMP report message of the lan interface, firstly, in the multicast MAC address table, the user (by the MAC address identifier) that has sent the packet is added to the media corresponding to the ip multicast group of the packet. The access control (Media Access Control, MAC for short) multicast group, if the corresponding entry is found according to the MAC multicast address, the port number of the receiving transport port, and the source MAC address, the user has joined the report packet. The multicast group is updated with the aging time and the packets are forwarded on the uplink port. If the corresponding entry is not found, the port has not been added to the multicast group specified in the report. Then, create an entry based on the multicast MAC address, physical port, and source MAC address, and set the aging time. The message is forwarded at the wan port. Step S3: When receiving the IGMP leave message of the lan interface, the multicast address, the lan port, and the source MAC address are also used to find whether the forwarding entry exists in the multicast MAC address table, and the existing MAC address table is deleted from the multicast MAC address table. This entry, and only finds whether there are other entries in the multicast address. If there is another lan interface that needs the multicast, the IGMP leave packet is discarded and is not forwarded to the wan port. If the multicast does not exist. For other entries, the IGMP leave message is forwarded to the wan port. As can be seen from the above 3⁄43⁄4, in the IGMP snooping mode, the modem itself does not actively send the query 4 message to the lan port (query 4 艮 text;), but passively forwards the query 4 艮 message sent by the uplink device, multicast The aging time of each entry in the MAC table can be updated only after receiving the report packet. The report packet is initiated by the user in addition to the first time joining the multicast group. The subsequent report packets are in response to the query. When the message is sent, we can know that the aging time of the MAC forwarding entry depends on the modem uplink device sending the query message. In practical applications, the inventor has found that the interval at which the uplink device sends the query is 180 seconds, and the initial aging time of the multicast forwarding entry in the modem is 120 seconds, within 60 seconds after the uplink device sends the query message. A user joins the multicast 239.1.1.1 from the port ethl. This causes the uplink device to send the next query message. The aging time has expired, causing the corresponding MAC forwarding entry to be deleted. The modem will no longer be used. Forward the multicast stream of 239.1.1.1 to ethl. At the same time, when the initial value of the aging time in the multicast MAC table is 'j, the interval between the sending of the query packets by the uplink device, the lan port multicast stream of the modem may be interrupted due to the aging time. The aging time of the IGMP snooping function is fixed. The aging time of the IGMP snooping function of most modems is fixed. The interface is not configured on the user interface. The modem cannot be changed after leaving the factory. If the above fault occurs, you need to adjust the interval at which the uplink device sends the query. Only a small number of modems can modify the aging time of IGMP snooping. However, it is also cumbersome for the staff to set the aging time according to the query interval of the uplink device. SUMMARY OF THE INVENTION The present invention has been made in view of the cumbersome problem of adjusting the aging time of an adjustment demodulator in the related art. To this end, the main object of the present invention is to provide an adjustment method and system for aging time, and a modem to solve the above problem. problem. In order to achieve the above object, according to an aspect of the present invention, a method of adjusting an aging time is provided. The method for adjusting the aging time comprises: the modem receiving the query message from the uplink device; the time interval at which the modem listens to two consecutive queries; and the modem uses the time interval as the aging time. Preferably, the modem detects whether the interval time has changed; and if the modem changes the interval time, the aging time is adjusted according to the changed interval time. Preferably, the initial value of the aging time is zero. Preferably, before the modem receives the query message from the uplink device, the method further includes: the uplink device detects whether a user joins the multicast group; and the uplink device detects that a user joins the multicast group, Send a query. Preferably, the time interval for the modem to listen to two consecutive queries includes: the modem creates the first variable and the second variable; and the modem saves the time of the two consecutive queries by using the first variable and the second variable respectively; And when the uplink device detects that a user joins the multicast group, the modem adds the difference between the time when the second variable is saved and the time when the first variable is saved plus the first time as the initial value of the aging time. Preferably, the two consecutive queries are the first query and the second query, and the method further includes: after receiving the first query message, the modem determines whether the second time is received. The second query is 4; and the modem updates the old ^^ time with the initial value if the second query is not received at the second time. In order to achieve the above object, according to another aspect of the present invention, a modem is provided. The modem includes: a receiving module, configured to receive an inquiry message from the uplink device; a monitoring module, configured to monitor two consecutive intervals of the query message; and a first adjustment module, configured to set the time The interval is the aging time. Preferably, the modem further comprises: a detecting module configured to detect whether the interval time changes; and a second adjusting module configured to adjust the aging time according to the changed interval time if the interval time is changed. In order to achieve the above object, according to another aspect of the present invention, an adjustment system for aging time is provided. The aging time adjustment system includes: an uplink device configured to send a query message; and a modem configured to receive the query message, listen to two consecutive time intervals of the query message, and set the time interval The interval is the aging time. Preferably, the uplink device is further configured to detect whether a user joins the multicast group, and if it is detected that the user joins the multicast group, send the query message. Through the invention, the modem receives the query message from the uplink device; the modem monitors the time interval of two consecutive queries; and the modem uses the time interval as the aging time method, and solves the related solution in the related art. Adjusting the aging time of the regulator is a cumbersome problem, and the effect of automatically adjusting the aging time of the demodulator is easily and conveniently achieved. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a schematic diagram of an aging time adjustment system according to an embodiment of the present invention; FIG. 2 is a flowchart of an aging time adjustment method according to an embodiment of the present invention; FIG. 3 is an embodiment of the present invention. FIG. 4 is a schematic diagram of setting an IGMP snooping aging time according to an embodiment of the present invention; FIG. 5 is a schematic diagram of a modem according to an embodiment of the present invention; FIG. 6 is a preferred embodiment of a modem according to the present invention; Schematic diagram. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. 1 is a schematic diagram of an adjustment system for aging time according to an embodiment of the present invention. As shown, the aging time adjustment system includes an uplink device 10 and a modem 20. The uplink device 10 is configured to send a query message, and the uplink device 10 can be a multicast router, a bas or the like, and the modem 20 is configured to receive the query message and monitor two consecutive messages. The time interval of the query 4 and the time interval as the aging time. The uplink device 10 can also be configured to detect whether a user joins the multicast group, and if the user is added to the multicast group, the query message is sent. The aging time adjustment system can automatically modify the IGMP snooping time of the modem according to the interval at which the uplink device sends the query message. 2 is a flow chart showing a method of adjusting an aging time according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps: Step S102: The modem receives the query message from the uplink device. Before the step 4 is aggregated, the uplink device may first detect whether a user joins the multicast group; and the uplink device sends the query message if it detects that a user joins the multicast group. Step S104, the modem monitors the time interval of two consecutive queries. For example, the time interval in which the modem listens to two consecutive queries may be in the following manner: the modem creates a first variable and a second variable; the modem utilizes the first variable and the second variable Separating the time of the two consecutive queries; and the time when the uplink device saves the second variable and the number of times when the uplink device detects that a user joins the multicast group The difference in time during which a variable is saved plus the first time is taken as the initial value of the aging time. Specifically, when the modem system starts, it creates several variables, query_first (used to save the time when the previous query 4 message arrived;), query second (used to save the time when the next query message arrived), timer query_timer, Old ^ ί匕 time initial value query_timeout. Preferably, in the case that no user joins the multicast group, the initial value of the aging time can be set to zero, so that the multicast does not age at the initial time. Initially, because no user joins any multicast group, the uplink device does not send the query packet, so the interval between the sending of the query message cannot be known. To prevent the uplink device from sending the query message, the user group. The broadcast forwarding entry has been aging, and the initial value of query_timeout is 0. The method may further include: after receiving the first query message, determining, by the modem, that the two consecutive query messages are the first query message and the second query message, Receiving the second query message at a second time; and the modem updating the aging time of all entries with the initial value if the second query message is not received at the second time. Step S106, the modem uses the time interval as an aging time. The aging time is the aging time of all entries in the multicast table. Preferably, the method may further include: the modem detecting whether the interval time is changed; and the modem is configured to change the aging time according to the changed interval time when the interval time is changed. Make adjustments. In the embodiment of the present invention, after the modem is started, when any user joins the multicast group, the uplink device starts to send the query 4 message, and the interval between the sending of the query message can be known by monitoring two consecutive query 4 texts. The aging time of the IGMP snooping is saved. If the user joins the multicast group, the saved value can be used as the initial value of the aging time. If the queried packet is sent after the uplink device is found, If the interval is changed, the value saved in the modem is also changed accordingly. This ensures that the IGMP snooping aging time changes with the interval between the sending of the query packets by the uplink device. FIG. 3 is a flow chart of obtaining an aging time according to an embodiment of the present invention. Step 4 gathers S302. Initially, the initial value of the aging time is query_timeout=0. Step S304, when receiving a query message, the first variable saves the query message, that is,

Query The arrival time of the text. Step S306, when receiving the next query message, the second variable saves the query message, that is, query_second=the arrival time of the query message. In step S308, the aging time is the difference between the second variable and the first variable plus a time value t1 (ie, the first time, the value may be set according to actual conditions). That is, query_timeout= query second- query_first+ 10. It can be seen from this embodiment that after a user joins the multicast group, the uplink device starts sending the query 4 message to the modem's wan port. Modem ^" The time to receive the first query 4 保存 is saved to query frist, >\ to the next query 保存保存 save time to query second, and query second minus the value of query first tl time (value The range can be between 10 and 180 seconds. Of course, the value range can also be changed with the change of the application scenario. The specific range is not limited. It is assigned to the query timeout, and the force time is 11 to ensure the initial time of the old time. The value is greater than the interval between the sending of the query 4 text, and then the time of the arrival of the next two query 4 texts is stored in the query_first and the query second, and the interval of the query 4 text is continuously monitored. Update the query timeout value. Step 4: After obtaining the query_timeout value for the first time, the aging time of all multicast entries will be updated with this value.Figure 4 is a schematic diagram of setting IGMP snooping aging time according to an embodiment of the present invention. As shown in Figure 4, when a user joins any multicast group, it first determines whether the query_timeout is 0. If it is 0, the aging time is set to more than half an hour, which is equivalent to ensuring that the query interval is not obtained before. The multicast forwarding entry will not be aged; if it is not 0, the query_timeout is set to the aging time. Preferably, after each receipt of the query 4, the timer query_timer is restarted, and the timing time is the time t2 on the query_timeout power port (ie, the second time, the range may be between Kt2<10 seconds, of course, the value thereof The scope can also be changed according to the application scenario. The specific scope is not limited. If the timer does not receive the query packet, the aging time of all entries is updated with the query_timeout to ensure that the uplink device sends the query interval. Modifications will not affect normal multicast services. From the above description, it can be seen that the present invention can automatically and automatically adjust the aging time of the adjustment demodulator. It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different from that herein. Figure 5 is a schematic illustration of a modem in accordance with an embodiment of the present invention. As shown, the modem includes a receiving module 502, a listening module 504, and a first adjustment module 506. The receiving module 502 is configured to receive a query message from the uplink device; the listening module 504 is configured to monitor two consecutive time intervals of the query; and the first adjusting module 506 is configured to set the time interval. As the aging time. Figure 6 is a schematic illustration of a preferred embodiment of a modem in accordance with the present invention. The modem of this embodiment may further include: a detecting module 508 configured to detect whether the interval time has changed; and a second adjusting module 510 configured to change at the interval time, compared to the foregoing embodiment The aging time is adjusted according to the interval time. In summary, the solution provided by the foregoing embodiment solves the problem that the adjustment of the aging time of the adjustment demodulator is complicated in the related art, and thus the automatic adjustment of the aging time of the adjustment demodulator is achieved simply and conveniently. effect. In addition, the solution does not need to change the hardware architecture of each device in the system and system, and it is easy to implement and has good industrial applicability. It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device, which can be centralized on a single computing device, or distributed in multiple Optionally, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into respective integrations. The circuit modules are implemented by making a plurality of modules or steps of them into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. An adjustment method for aging time, including:

The modem receives the query message from the uplink device;

The time interval at which the modem listens for two consecutive queries; and the modem uses the time interval as the aging time.

2. The method according to claim 1, wherein

The modem detects whether the interval time has changed; and the modem adjusts the aging time according to the changed interval time if the interval time changes.

3. The method according to claim 1, wherein the initial value of the aging time is zero.

The method according to any one of claims 1 to 3, wherein, before the modem receives the query message from the uplink device, the method further includes:

The uplink device detects whether a user joins the multicast group;

The uplink device sends the query message when it detects that a user joins the multicast group.

5. The method according to claim 4, wherein the time interval in which the modem listens to two consecutive queries includes:

The modem creates a first variable and a second variable;

The modem saves the time of the two consecutive queries using the first variable and the second variable;

When the uplink device detects that a user joins the multicast group, the modem adds the difference between the time saved by the second variable and the time saved by the first variable to the first time as the old time. ^ ^ The initial value of the time.

The method of claim 5, wherein the two consecutive queries are the first query and the second query, the method further comprising: After receiving the first query message, the modem determines whether the second query message is received at a second time;

The modem updates the old ^^ time with the initial value if the second query message is not received at the second time.

7. A modem that includes:

a receiving module, configured to receive a query message from the uplink device;

The monitoring module is configured to monitor two consecutive time intervals of the query message; and the first adjusting module is configured to use the time interval as an aging time.

8. The modem according to claim 7, further comprising:

The detecting module is configured to detect whether the interval time changes; and the second adjusting module is configured to adjust the aging time according to the changed interval time when the interval time is changed.

9. An adjustment system for aging time, comprising:

The uplink device is set to send a query message;

The modem is configured to receive the query message, listen to two consecutive intervals of the query message, and use the time interval as an aging time.

10. The system according to claim 9, wherein the uplink device is further configured to detect whether a user joins the multicast group, and if the user is detected to join the multicast group, send the query. Text.