CN1635743A

CN1635743A - Method for logging-out invalid IGMP multicast port on router

Info

Publication number: CN1635743A
Application number: CNA2003101238610A
Authority: CN
Inventors: 郑平
Original assignee: Huawei Technologies Co Ltd
Current assignee: Beijing property right Bats Exchange Inc
Priority date: 2003-12-31
Filing date: 2003-12-31
Publication date: 2005-07-06
Anticipated expiration: 2023-12-31
Also published as: CN100365987C

Abstract

This invention refers to a method for quick canceling IGMP multicasting terminal which is ineffective in router, which contains (1), testing the connection state in route terminal, (2), canceling ineffective terminal in testing the ineffective terminal according to definite strategy. Said invention can save said terminal occupied multicasting bandwidth in terminal being ineffective.

Description

Nullify the method for the Internet Group Management Protocol multicast port that lost efficacy on the router

Technical field

The present invention relates to a kind of method of nullifying IGMP (Internet Group Management Protocol) multicast port that lost efficacy on the router, relate in particular to a kind of port that utilizes and detect, nullify the method for the IGMP multicast port that lost efficacy on the router fast.

Background technology

In the IGMP multicast protocol, the member of a multicast group may be on one or more ports of equipment, and these ports are to register by the response process of IGMP agreement, are called the member port of this multicast group.Fig. 1 shows the multicast group under the normal operation.As shown in Figure 1, the multicast service that belongs to certain multicast group will be sent to corresponding member port and get on, and other port will not be transmitted, so that conserve bandwidth.When member's port no longer needs multicast service, then in the multicast group of correspondence, nullify this member port with conserve bandwidth.

Generally, in IGMP, the cancellation of member port realizes by dual mode:

1, utilize the timed sending query message to refresh in esse multicast group member port, the member port that needs to continue to use must in time feed back.Be considered as no longer existing for the port that does not have response in time, it is carried out deletion action.

2, under the V2 of IGMP version, when needing to nullify, multicast group member port can send leave message to equipment, and equipment is inquired about separately by the multicast group at this member place, realizes the cancellation of the multicast member of this group.

Above cancellation mode is to realize under the supposition port connects normally, now is analyzed as follows.No matter whether port lost efficacy mode 1, all can work.Mode 2 must send message to equipment, can't make in this way when port connects inefficacy.Lost efficacy if port connects, and then can only utilize method 1 to finish cancellation.For the IGMP agreement, the process of nullifying is: multicast router sends query message, be broadcast to all of the port of equipment, wait for that the member in this group sends response message, response message is lost when preventing that network condition is not good, allow 1 to 4 time do not respond (being generally 3 times), view network situation and deciding.When through repeatedly inquiry, when certain member port does not have the number of times of response to reach predetermined number of times, could determine this port is deleted from the group of correspondence.That is to say that the query time about needing 3 to take turns usually just can be finished cancellation.In general, one takes turns inquiry approximately needs about 2 minutes, and 3 take turns inquiry then needed about 6 minutes, and during this period of time, bandwidth has been wasted.

Thereby existing technology is run into port and is connected situation about losing efficacy in actual applications, and it is slow then to exist cancellation inefficacy port, the situation of waste bandwidth.

Summary of the invention

The above-mentioned shortcoming that the present invention is directed to prior art is made, thereby, the purpose of this invention is to provide a kind of method of nullifying the IGMP multicast port that lost efficacy on the router, refresh port improves bandwidth availability ratio rapidly.

For achieving the above object, the invention provides a kind of method of nullifying the IGMP multicast port that lost efficacy on the router, may further comprise the steps: (1) is detected the connection status of router port; (2) when detecting described port and lost efficacy, nullify described inefficacy port according to certain strategy.

Preferably, adopt the connection status of LPT (link break-through technology) technology for detection port.

Preferably, by checking whether overhead byte judges normally whether port connects.

Preferably, by checking whether the special data frame that port transmitted judges normally whether port connects.

Preferably, judge by the register-bit on the chip of checking the use of IP port whether port connects.

Preferably, described step 2) strategy in is meant, short time-delay is set, and is available if described inefficacy port recovers in described time-delay, then do not nullify, and when finishing as time-delay, described inefficacy port does not recover available, then nullifies described inefficacy port.

Preferably, the strategy described step 2) is meant the described inefficacy port of direct cancellation.

Preferably, when recovering to connect, port sends the multicast group query message at once, so that continue to use the group of multicast to recover registration again to needs.

Preferably, nullify described inefficacy port by a delete interface.

The method of the inefficacy port of IGMP multicast on the cancellation router of the present invention realizes that simply resource occupation is few, does not need the IGMP multicast protocol is carried out big modification, can save the shared multicast bandwidth of this port under the port failure conditions.

Description of drawings

Fig. 1 is the group under the normal operation;

Fig. 2 is that the port under the normal condition is nullified schematic diagram;

Fig. 3 is the schematic diagram of detection inefficacy port of the present invention and the quick port of nullifying.

Embodiment

Explain specific embodiments of the present invention below in conjunction with accompanying drawing.

As shown in Figure 2, from the log off procedure of prior art as can be known, it is to need that stipulated number-from the process that respective sets is deleted port, such process is comparatively not consuming time through inquire about-not responding-reaching that the normal condition lower port withdraws from IGMP multicast member group.At the port this special circumstances that lost efficacy, the present invention adopts such strategy, promptly monitor all of the port, find certain port inefficacy (for example going offline), all groups of automatic inspection then, the group that comprises this port is handled, this port is rejected, so just can realize the purpose of getting rid of the inefficacy port rapidly, saving this a part of bandwidth.

As shown in Figure 3, the present invention detects by the state to port, realizes refreshing fast of multicast group member port.Can use the connection status of detection port someway, the method for detection port connection status mainly contains two types, and 1, check the IP port, the register-bit on the chip that can use by port judge whether port connects.2, check the virtual port that transmits by optical fiber, can be by checking whether the overhead byte that is transmitted normally judges whether to connect.Also can use other detection method, only need when port can't be accepted multicast service, can be examined out to get final product.Described inefficacy comprises that local terminal lost efficacy or lost efficacy in the opposite end (considering situation about detecting by remote equipment, LPT technology for example, i.e. Link pass through, link break-through technology).

Lost efficacy for local terminal, can with method be whether the register of checking the connection status of port normally obtains, all effective for physics light mouth/electricity mouth.Lost efficacy for far-end, existed only in the virtual port that transmits by optical fiber.In this case, owing to may exist the later terminal of repeatedly cascade that situation about losing efficacy takes place,, must detect by special agreement so can't directly judge by the connection of physical state.This detection has two kinds of main modes: 1, directly utilize the reserve part in the SDH overhead byte to transmit, when finding that this byte becomes abnormal condition, just can judge to connect had lost efficacy.2, special Frame of design transmits in the virtual port business together, as long as professional disconnected, this special frame also can't pass to, and then can judge to connect and lose efficacy.

Be detected if port loses efficacy, and so just can report to IGMP multicast protocol administration module requirement cancellation and lose the member port of effect.To be on the safe side, can decide when nullify this port by certain strategy.These strategies should be determined according to concrete should being used for.For example: 1, short time-delay is set,, does not then carry out cancellation work if during this period of time port recovers available.For the port of failing at the appointed time to recover, handle by calling a delete interface.2, also can call delete interface immediately and delete, but when port recovers to connect, send the multicast group query message at once, so that continue to use the group of multicast to recover registration again to needs.About delete interface, this interface scans the multicast group of all existence, promptly traversal is searched all records of multicast group record sheet, check content corresponding, comprised the inefficacy port that just has been checked through if find the multicast member port in this record, then just the lost efficacy deletion of port of the discovery multicast group that contains the inefficacy port.

More than the preferred embodiments of the present invention are described in detail for illustrative purposes; but those of ordinary skill in the art is to be appreciated that; under the situation of scope and spirit of the present invention; various improvement, interpolation and replacement all are possible, and all in the protection range that claim of the present invention limited.

Claims

1. method of nullifying the Internet Group Management Protocol multicast port that lost efficacy on the router is characterized in that may further comprise the steps:

(1) connection status to router port detects;

(2) when detecting described port and lost efficacy, nullify described inefficacy port according to certain strategy.

2. according to the described method of claim 1, it is characterized in that, adopt the connection status of link break-through technology for detection port.

3. according to the described method of claim 1, it is characterized in that, judge by the register-bit on the chip of checking the use of IP port whether port connects.

4. according to the described method of claim 1, it is characterized in that whether judge normally by checking the overhead byte that port transmitted whether port connects.

5. according to the described method of claim 1, it is characterized in that whether judge normally by checking the special data frame that port transmitted whether port connects.

6. according to each described method of claim 1 to 5, it is characterized in that, described step 2) strategy in is meant short time-delay is set, in described time-delay, if it is available that described inefficacy port recovers, then do not nullify, if delay time when finishing, described inefficacy port does not recover available, then nullifies described inefficacy port.

7. according to each described method of claim 1 to 5, it is characterized in that described step 2) in strategy be meant the described inefficacy port of direct cancellation.

8. according to the described method of claim 6, it is characterized in that, when port recovers to connect, send the multicast group query message at once, so that continue to use the group of multicast to recover registration again to needs.

9. according to the described method of claim 7, it is characterized in that, when port recovers to connect, send the multicast group query message at once, so that continue to use the group of multicast to recover registration again to needs.

10. according to each described method of claim 1 to 5, it is characterized in that, nullify described inefficacy port by a delete interface.