KR20090132659A - Apparatus for internet group management protocol proxy - Google Patents

Abstract

PURPOSE: An internet group management protocol proxy apparatus is provided to support continuously a normal multicast service irrespective of a failure of an upstream interface, a link failure between the upstream interface and a multicast router or a failure of the multicast router. CONSTITUTION: A switching unit(500) transmits an IGMP report packet to a corresponding multicast router according to a receiving state of a packet of at least one downstream interface. The switching unit switches a connective relation between a plurality of upstream interfaces and at least one downstream interface. The switching unit transmits multicast packet received from the upstream interfaces to a corresponding host. A first table stores priority information assigned to the upstream interfaces.

Description

Internet group management protocol proxy device {apparatus for Internet Group Management Protocol Proxy}

The present invention relates to an IGMP proxy device, and more particularly, but not exclusively, to an IGMP proxy device that can effectively cope with a failure situation.

Since the Internet Group Management Protocol (IGMP) proxy can forward multicast packets only with IGMP membership information, the Multicast Routing Protocol: Hereinafter, MRP) is not necessarily required. Therefore, it is possible to reduce the complicated calculation performance by the MRP, even if different MRP is used.

1 and 2 are conceptual diagrams for explaining a general IGMP proxy.

IGMP proxy device 170 has one upstream interface 110 and downstream interfaces 120 and 130.

The upstream interface 110 is an interface connected to the multicast router 100 located above, and serves as a host of IGMP.

The first downstream interface 120 and the second downstream interface 130 are interfaces connected to the first subnet 150 and the second subnet 160, respectively, and serve as routers of IGMP. At least one host (not shown) is included in the subnets 150 and 160, and a switch or the like may be included in some cases.

The first and second downstream interfaces 120 and 130 manage the first and second subscription lists 122 and 132, respectively. Here, the subscription lists 122 and 132 are information including membership of the subnets 150 and 160 associated with the downstream interfaces 120 and 130, and the membership is a multicast address serving the corresponding subnets 150 and 160. Means.

The membership database 140 is a database in which the subscription lists 122 and 132 of the downstream interfaces 120 and 130 are merged. As shown in FIG. 1, a set of membership records is stored as an entry. Here, the membership record includes a multicast address, as shown in FIG. 1, and may additionally include a filter mode and a source list.

FIG. 2 shows an IGMP when a host (not shown) in the first subnet 150 transmits an IGMP report packet to receive a multicast service of a multicast address 225.1.2.1 in the state of FIG. 1. It is a conceptual diagram for explaining the operation of the proxy device 170. For convenience, the reference numerals in FIG. 2 refer to the same reference numerals in FIG. 1.

In FIG. 2, when the first downstream interface 120 receives an IGMP report packet from the first subnet 150, the first subscription information 122 is updated. Here, examples of the IGMP report packet may include an IGMP membership report packet for notifying a multicast address that you want to receive a service, and an IGMP leave report packet for indicating that you do not want a service for the multicast address. It is not limited to this.

The updated subscription information is reflected in the membership database 140, and the updated portion of the membership DB 140 (ie, the membership record) is transmitted through the upstream interface 110 in the form of an IGMP report packet. Is passed to.

Since the IGMP report packet in FIG. 2 is intended to receive the service of the multicast address 255.1.2.1, the multicast router 100 which has received this transfers the packet corresponding to the multicast address to the IGMP proxy device 170. As a result, a host (not shown) in the first subnet 150 requesting the corresponding service receives the corresponding multicast packet through the downstream interface 120 of the IGMP proxy device 170.

On the other hand, the above-described IGMP proxy device is designed on the assumption of a simple tree topology environment that does not require routing information exchange. There is a problem that can not be provided.

The technical problem to be achieved by the present invention is to provide an IGMP proxy device that can effectively cope with a failure situation.

In order to achieve the above technical problem, a first aspect of the present invention provides a plurality of upstream interfaces; At least one downstream interface; And sending the IGMP report packet to the corresponding multicast router according to the packet reception at the at least one downstream interface, or sending the multicast packet received from the plurality of upstream interfaces to the host. An internet group protocol proxy apparatus including a switching unit for switching a connection relationship between interfaces and the at least one downstream interface.

In order to achieve the above technical problem, a second aspect of the present invention provides a plurality of upstream interfaces; At least one downstream interface; And a management unit configured to store merge information on at least one of the plurality of upstream interfaces, information of merging subscription lists of at least one downstream interface connected with the upstream interface, in a membership DB. To provide.

Embodiments of the present invention presented above may have an effect including the following advantages. However, all the embodiments of the present invention are not meant to include them all, and thus the scope of the present invention should not be understood as being limited thereto.

According to an embodiment of the present invention, even if a failure of the upstream interface itself, a link failure between the upstream interface and the multicast router, a failure of the multicast router, etc., the normal multicast service can be continuously provided.

According to an embodiment of the present invention, since the IGMP proxy function is performed through several upstream interfaces and multiple multicast routers connected thereto, even in an environment where hosts or subnets are provided with multicast services, the multicast service can be effectively provided. have.

Since descriptions of embodiments of the present invention are merely illustrated for structural to functional descriptions of the present invention, the scope of the present invention should not be construed as limited by the embodiments described in the present invention. That is, the embodiments of the present invention may be variously modified and may have various forms, and thus, it should be understood that the present invention includes equivalents capable of realizing the technical idea of the present invention.

On the other hand, the meaning of the terms described in the present invention will be understood as follows.

Terms such as "first" and "second" are intended to distinguish one component from another component, and the scope of the present invention should not be limited by these terms. For example, a first component may be named a second component, and similarly, a second component may also be named a first component.

The term “and / or” should be understood to include all combinations that can be presented from one or more related items. For example, "first item, second item, and / or third item" means "at least one or more of the first item, second item, and third item", and means first, second, or third item. A combination of all items that can be presented from two or more of the first, second and third items as well as the third item.

When a component is referred to as being "connected" to another component, it should be understood that there may be other components in between, although it may be directly connected to the other component. On the other hand, when a component is said to be "directly connected" to another component, it should be understood that there is no other component in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

Singular expressions described herein are to be understood to include plural expressions unless the context clearly indicates otherwise, and the terms "comprise" or "having" include elements, features, numbers, steps, operations, and elements described. It is to be understood that the present invention is intended to designate that there is a part or a combination thereof, and does not exclude in advance the possibility of the presence or addition of one or more other features or numbers, steps, actions, components, parts or combinations thereof. .

Each step described in the present invention may occur differently from the stated order unless the context clearly dictates the specific order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall be interpreted as having ideal or overly formal meanings unless expressly defined in this application. Can't be.

If an upstream interface-related failure occurs, the hosts underneath the IGMP proxy device can no longer receive multicast services. Here, an example of an upstream interface-related failure may include a failure in a multicast router connected to an upstream interface, a failure of a link between the multicast router and an IGMP proxy device, or an failure of the upstream interface itself. It is not necessarily limited thereto.

Accordingly, according to one embodiment of the present invention, in order to ensure continuous multicast service even in such a failure situation, the IGMP proxy device includes a plurality of upstream interfaces. It also provides, as an additional embodiment, the efficient operation and structure of an IGMP proxy device to cope with failure situations.

3A and 3B are diagrams for describing an operation of an IGMP proxy device according to an embodiment of the present invention.

3A and 3B show a first multicast router 300, a second multicast router 302, a third multicast router 304, an IGMP proxy device 310, and an IGMP proxy device 310. The upstream interfaces u1, u2, u3, the downstream interfaces d1, d2, the first table 320, the second table 330, the subscription lists 340, 342, and the membership database 350. It is shown to include.

FIG. 3A is a diagram illustrating that the IGMP proxy device 310 operates in a normal situation according to an embodiment of the present invention, and FIG. 3B illustrates the IGMP proxy device 310 in a situation where a failure occurs in the first upstream interface u1. ) Is a view for explaining the operation.

Referring to Figure 3a, the operation in the normal situation will be described as follows.

Priority information assigned to the upstream interfaces u1, u2, and u3 is stored in the first table 320. Referring to FIG. 3A, it can be seen that the first upstream interface u1 is priority 3 and has the highest priority.

The second table 330 stores information on at least one candidate upstream interface to be connected to each of the downstream interfaces d1 and d2. Referring to FIG. 3A, the candidate upstream interfaces to be connected to the first downstream interface d1 may be the first upstream interface u1, the second upstream interface u2, and the third upstream interface u3. .

The IGMP proxy device 310 manages subscription lists 340 and 342 corresponding to each of the downstream interfaces d1 and d2.

In addition, the IGMP proxy device 310 stores / manages the merged information for each of the upstream interfaces u1, u2, and u3 in the membership database 350. Here, the merging information is information obtained by merging subscription lists 340 and 342 of at least one downstream interface d1 and d2 connected to the corresponding upstream interfaces u1, u2 and u3. Referring to FIG. The merging information of the upstream interface u1 includes the multicast addresses 225.1.1.1, 225.1.1.2, and 225.1.1.3, and the second and third upstream interfaces u2 and u3 connect with the downstream interfaces d1 and d2. Since it is not, there is no merge information for this.

When the membership database 350 is updated according to the packet reception at the downstream interfaces d1 and d2, the IGMP proxy device 310 transmits an IGMP report packet to a corresponding multicast router 300, 302, 304, or upstream. In order to transmit the multicast packets received from the interfaces u1, u2 and u3 to the host (not shown), the connection relationship between the upstream interfaces u1, u2 and u3 and the downstream interfaces d1 and d2 is switched. .

For example, when receiving an IGMP report packet transmitted from a host (not shown) at the first downstream interface d1, the IGMP proxy device 310 updates the first subscription list 340 and then updates the updated contents. To the membership database 350. When the membership database 350 is updated, the IGMP proxy device 310 may determine that the candidate upstream interface of the first downstream interface d1 in which the IGMP report packet is received is the first, second, and third upstream interfaces u1, u2, and u3. By checking through the second table 330, and then confirming through the first table 320 that the highest priority among the candidate upstream interfaces (u1, u2, u3) is the first upstream interface (u1), The IGMP report packet is transmitted through the first upstream interface u1. As a result, the host transmitting the IGMP report packet can receive the corresponding multicast packet through the first downstream interface d1 of the first multicast router 300 and the IGMP proxy device 310.

An example of receiving a multicast packet is as follows. The IGMP proxy device 310 checks the merging information of the upstream interfaces u1, u2, u3 where the multicast packet is received and determines whether to forward or discard it. If determined to forward, the IGMP proxy device 310 determines the downstream interfaces d1 and d2 to be used for multicast packet transmission based on the subscription lists 340 and 342. For example, when a multicast packet associated with the multicast address 225.1.1.2 is received at the first upstream interface u1, the multicast packet associated with the multicast address 225.1.1.2 may be received according to the state of the membership database 350 and the subscription lists 340 and 342 shown in FIG. 3A. 2 is forwarded through the downstream interface d2.

Referring to FIG. 3B, the operation when a failure situation occurs is as follows. That is, FIG. 3B is a diagram illustrating a result of performing an error coping operation by the IGMP proxy device 310 operating in the normal environment as shown in FIG. 3A by detecting a failure associated with the first upstream interface u1.

Here, as an example of a failure detection method, a method of confirming through a status parameter of upstream interfaces u1, u2, and u3, and a multicast packet of a group joined by upstream interfaces u1, u2, and u3 are fixed. A method of confirming whether or not it is being received for a time may be included, but is not necessarily limited thereto.

Upon detecting such a failure, the IGMP proxy device 310 deletes the first upstream interface u1 from the second table 330 and then checks whether there are downstream interfaces d1 and d2 connected to the first upstream interface u1. Check it. In FIG. 3A, since both of the first and second downstream interfaces d1 and d2 are connected to the first upstream interface u1, the next upstream interface based on the first table 320 is the second upstream interface u2. After confirming that the first and second subscription lists 340 and 342 are merged and included in the merge information of the second upstream interface u2, the merge information of the first upstream interface u1 is deleted from the membership database 350. Then, the corresponding IGMP report packet is transmitted through the second upstream interface u2. Here, the transmitted IGMP report packet is related to the multicast addresses 225.1.1.1, 225.1.1.2, and 225.1.1.3. Thereafter, the host (not shown) may receive the corresponding multicast service through the second multicast router 302 instead of the first multicast router 300.

4A and 4B are diagrams for describing an operation of an IGMP proxy device according to another embodiment of the present invention.

4A and 4B show a first multicast router 400, a second multicast router 402, a third multicast router 404, an IGMP proxy device 410, and an IGMP proxy device 410. ) Includes upstream interfaces u1, u2, u3, downstream interfaces d1, d2, first table 420, second table 430, subscription lists 440, 442, and membership database 450. It is shown to include.

4A is a diagram illustrating that the IGMP proxy device 410 operates in a normal situation according to an embodiment of the present invention, and FIG. 4B illustrates the IGMP proxy device 410 in a situation where a failure occurs in the second upstream interface u2. ) Is a view for explaining the operation.

In FIG. 4A, since the first downstream interface d1 is connected with the first upstream interface u1, and the second downstream interface d2 is connected with the second upstream interface u2, the first table ( 420 and subscription lists 440, 442, the second table 430 and the membership database 450 have entries as shown in FIG. 4A. If you are in the field, you can fully understand it.

Referring to FIG. 4B, the operation when a failure situation occurs is as follows. That is, FIG. 4B is a diagram illustrating a result of performing an error coping operation by the IGMP proxy device 410 operating in the normal environment as shown in FIG. 4A by detecting a failure associated with the second upstream interface u2.

Referring to the first table 420 of FIG. 4A and the second table 430 of FIG. 4A, the downstream interface related to the second upstream interface u2 may be the second downstream interface d2. . As a result, the contents of the second table 430 of FIG. 4A and the membership database 450 of FIG. 4A are converted into the contents of the second table 430 of FIG. 4B and the membership database 450 of FIG. 4A through a failover operation. You can see that it has changed.

In the situation of FIG. 4B as a result of the failover, the host connected to the second downstream interface d2 can receive continuous multicast service through the third multicast router 404 instead of the second multicast router 402. do.

5 is a block diagram illustrating a configuration of an IGMP proxy device according to an embodiment of the present invention. The specific operation of the embodiment of FIG. 5 can be fully understood from the description of FIGS. 3A, 3B, 4A, and 4B by those skilled in the art, and thus detailed description thereof will be omitted.

5, the IGMP proxy device 410 according to an embodiment of the present invention is the upstream interface (u1, u2, u3). It includes a downstream interface (d1, d2), the switching unit 500, the management unit 510, and the reporting unit 520. The first table, the second table, the subscription list, and the membership database are not shown for convenience and may be included in the management unit 510 or stored in a separate storage module.

When the membership database is updated according to the packet reception at the downstream interfaces d1 and d2, the switching unit 500 transmits an IGMP report packet to a corresponding multicast router (not shown), or the upstream interfaces u1, u2, and the like. In order to transmit the multicast packet received from u3 to the corresponding host (not shown), the connection relationship between the upstream interfaces u1, u2 and u3 and the downstream interfaces d1 and d2 is switched. For example, when a failure is detected at the first upstream interface u2 as illustrated in FIG. 3B, the switching unit 500 may be configured to, among the remaining upstream interfaces u2 and u3 except for the first upstream interface u1 associated with the failure. The connection relationship is switched so that the multicast service can continue through one second upstream interface u2. Specific operations for switching are as described above with reference to FIGS. 3A, 3B, 4A, and 4B.

The management unit 510 stores / manages the merged information of the upstream interfaces u1, u2, and u3 in the membership database.

When the merge information of any one of the upstream interfaces u1, u2, and u3 is updated, the report unit 520 transmits an IGMP report packet including the updated contents through the upstream interface associated with the updated merge information.

For example, when a failure is detected at the first upstream interface u1 as illustrated in FIG. 3B, the management unit 510 may include one of the remaining upstream interfaces u2 and u3 except for the first upstream interface u1 associated with the failure. After selecting the second upstream interface u2, the merge information of the first upstream interface u1 related to the failure is merged and updated with the merge information of the selected upstream interface u2, and the report unit 520 updates the updated contents. An IGMP report packet containing the message is transmitted through the selected upstream interface u2.

As described above with reference to FIGS. 3A, 3B, 4A, and 4B, the above-described operations may be implemented by effectively utilizing the first table, the second table, the subscription list, and the membership database.

The inventors of the present invention have been described with reference to the embodiments shown in the drawings for clarity, but this is merely exemplary, and those skilled in the art may various modifications and other equivalent embodiments therefrom. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

Embodiments of the present invention presented above may have an effect including the following advantages. However, all the embodiments of the present invention are not meant to include them all, and thus the scope of the present invention should not be understood as being limited thereto.

According to an embodiment of the present invention, even if a failure of the upstream interface itself, a link failure between the upstream interface and the multicast router, a failure of the multicast router, etc., the normal multicast service can be continuously provided.

According to an embodiment of the present invention, since the IGMP proxy function is performed through several upstream interfaces and multiple multicast routers connected thereto, even in an environment where hosts or subnets are provided with multicast services, the multicast service can be effectively provided. have.

1 and 2 are conceptual diagrams for explaining a general IGMP proxy.

3A to 4B are diagrams for describing an operation of an IGMP proxy device according to an embodiment of the present invention.

5 is a block diagram illustrating a configuration of an IGMP proxy device according to an embodiment of the present invention.

Claims (10)

A plurality of upstream interfaces; At least one downstream interface; And The plurality of upstream interfaces to send an IGMP report packet to the corresponding multicast router according to the packet reception at the at least one downstream interface, or to send a multicast packet received from the plurality of upstream interfaces to the host; And a switching unit for switching a connection relationship between the devices and the at least one downstream interface. The method of claim 1, A first table storing priority information assigned to the upstream interfaces; And A second table storing information on at least one candidate upstream interface to be connected with each of the at least one downstream interfaces, And the switching unit determines an upstream interface to be connected with a downstream interface from which a packet is received, based on the first table and the second table. The method of claim 2, wherein the switching unit, Detecting at least one candidate upstream interface to which the packet is to be connected to the received downstream interface based on the second table, and then selecting and connecting one of the at least one candidate upstream interface based on the first table; An internet group management protocol proxy device. The method of claim 1, wherein the switching unit, And when a multicast packet is received, based on a subscription list managed for each of the at least one downstream interface, determining a downstream interface to transmit the received multicast packet to. The method according to any one of claims 1 to 4, wherein the switching unit, And detecting an upstream interface related failure so as to switch the connection relationship so that the multicast service can continue through the upstream interface except the upstream interface associated with the failure. A plurality of upstream interfaces; At least one downstream interface; And A management unit that stores merge information on at least one of the plurality of upstream interfaces in a membership DB, And the merging information is information obtained by merging subscription lists of at least one downstream interface connected with the corresponding upstream interface. The method of claim 6, When the merge information of any one of the plurality of upstream interfaces is updated, Internet group management further comprises a transmission unit for transmitting an IGMP report packet containing the updated content through the upstream interface associated with the updated merge information Protocol proxy device. The method of claim 6, If an upstream interface related to a failure is detected, the management unit selects one of the remaining upstream interfaces, updates the merged information of the upstream interface related to the failure by merging the merged information of the selected upstream interface, and updates the merged information. And a reporting unit which transmits the updated IGMP report containing the updated contents through the selected upstream interface. The method of claim 8, A first table storing priority information assigned to the upstream interfaces; And A second table storing information on at least one candidate upstream interface to be connected with each of the at least one downstream interfaces, And the management unit selects one of the remaining upstream interfaces based on the first table and the second table. The method of claim 9, wherein the management unit, And delete the upstream interface associated with the failure from the second table.

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