KR20010005278A - Dynamic multicast address allocation mechanism for Ipv6 - Google Patents

Abstract

PURPOSE: A method for allocating a multicast address in the internet protocol(IP) V6 is provided to divide multicast ranges into a local range and a global range, and to make a host opening a multicast session generate the multicast session in the local range, then to allocate the multicast address to the host through an address server in the global range, so as to minimize load caused when the multicast address is allocated. CONSTITUTION: If a multicast session is formed by a host in an internet protocol(IP) V6(1), the host designates a multicast range. The host decides whether the designated multicast range is a global range(2). If so, the host receives an address through a multicast address server(3). If the designated multicast range is not the global range, the host confirms whether the multicast range is a site local(4). If so, the host combines a subnet ID, an interface ID, and an 8-bit Y value, and generates a multicast address(6). If the designated multicast range is not the site local, the host combines the interface ID with an 8-bit X value only, and generates a multicast address(5). The multicast address generations are completed.

Description

Dynamic multicast address allocation mechanism for IPv6

The present invention relates to a multicast address allocation method in IPv6, and more particularly, to a method for generating an address according to a multicast range when a multicast session is formed in IPv6.

The multicast address allocation method currently in use is a method of generating a multicast address arbitrarily within a certain range, which may cause an address duplication problem due to an increase in multicast sessions. In addition, the hierarchical multicast address allocation method provided by the Multicast Group Authority (MGA) requires an allocation to a higher node through an intermediate node to receive an address from a local MGA node. And the load accompanying address management is increased.

FIG. 1 illustrates an example of MGA address allocation, in which a request is made to an upper node root via an intermediate node 1.1 and a node 1 in order to be assigned an address at a local MGA node 1.1.1. The process of receiving 10 addresses from the 30 addresses provided and assigning the address to the host requesting the multicast address is shown.

Therefore, in the present invention devised to solve the above problems, the object of the present invention is to minimize the possibility of address duplication, delay time due to address assignment, and load due to address management by applying different address generation methods according to the multicast range. have.

1 is a view schematically showing an example of address allocation by a conventional multicast group authorization method (MGA),

2 is a flowchart of an algorithm for generating a multicast address when forming a multicast session;

3 illustrates a format for global multicast address generation;

4 is a conceptual diagram illustrating a site local multicast address generation format;

5 is a conceptual diagram illustrating a link-local multicast address generation format.

In order to realize the above object, the present invention allows the host to generate an address itself when the multicast range is local, and to be assigned an address through a server when the range is global. This multicast address allocation method minimizes the possibility of address duplication, delay time due to address assignment, and load due to address management.

The present invention provides a method for allocating a multicast address in IPv6.

Determining, by the multicast address server, the subscriber prefix and the subnet ID from the router in the subnet when determining the global multicast address range;

Determining an available address area from the obtained information and assigning a multicast address to the host;

Allocating the multicast address to generate a site-local multicast address and a link-local multicast address.

In this multicast address assignment method, the global multicast address assignment step secures a unique address area through a request for an address area to be used between servers in the subnet. In addition, when generating a site-local multicast address, the host generates a first group ID value by combining a subnet ID, an interface ID, and an arbitrary 8-bit value. When generating a link-local multicast address, the host itself generates a second group ID value by combining the interface ID with an arbitrary 8-bit value.

Now, with reference to the accompanying drawings with respect to Figures 2 to 3, 4, and 5 to be described below will be described in detail.

2 is a flowchart of an algorithm for generating a multicast address when forming a multicast session according to the multicast address allocation method of the present invention.

When a multicast session is established by the host in IPv6 (step), the host specifies a multicast range. Determine whether the specified multicast range is global (step). If it is determined that it is global in the step, the address is assigned through the multicast address server (step). In the meantime, if the designated multicast range is not global, it is checked whether the multicast range is site-local. (step ).

If the multicast range is site-local, the host itself generates a multicast address by combining its subnet ID, interface ID, and 8-bit Y value. The host generates a multicast address by combining only the interface ID and an 8-bit X value (step). The multicast address generation then ends.

3 is an embodiment of global multicast address generation (see step 2 of FIG. 2).

The multicast address server obtains information on the subscriber prefix and the subnet ID from the router in the subnet to which the multicast address area to be allocated to the host is formed as in the global multicast address format of FIG. 3. The Z value of the global multicast address format indicates an assignable address area. If there is more than one multicast address server in the subnet, each server must decide which address area to use in the subnet. 3 illustrates an embodiment of determining an address area between servers in a subnet. Server A requests to use a multicast address having an address range of FFlE: X: Y: 0010/108 in the available address area. Server B, which receives the address assignment request from Server A, sends a collision message Collision_message to Server A because it is already using the address requested by Server A. Server A, which has received the collision message Collision_message, selects a new address area. If there is no response from another server in response to the newly selected address area request, it registers as its own address area.

4 is a conceptual diagram illustrating a method for generating a site-local multicast address. The IPv6 multicast address starts with FF. In the case of the site-local multicast address, the range of multicast is limited to one site, so 5 is assigned to the scope of the multicast address. The group ID value in the multicast address area of FIG. 4 is composed of a combination of a subnet ID, an interface ID, and an 8-bit Y value. The subnet ID is an identifier for identifying the subnet to which the host is connected. The subnet ID can be obtained from the router connected to the link, and the interface ID is the hardware address of the host. The Y value is a value arbitrarily selected by the host.

5 is a conceptual diagram illustrating a method of generating a link-local multicast address. The IPv6 multicast address starts with FF. In the case of a link-local multicast address, since the multicast range is limited to one link, 2 is assigned to the scope value of the multicast address. The group ID value in the multicast address area of Fig. 5 is composed of a combination of an interface ID and an 8-bit X value. The interface ID is the hardware address of the host and the X value is a value arbitrarily selected by the host.

2 to 3, 4, and 5 described above, in the present invention, when the multicast range is local, the host generates itself by combining the information obtained from the router with the host information. Minimize the delay that follows. In this case, the address is generated by combining the subnet ID and the interface ID in consideration of the locality of the multicast range and minimizing the possibility of address duplication within the range.

On the other hand, when the multicast range is global, in order to minimize the delay time caused by the address area allocation in the multicast address server, an available address area is determined from router information between servers in the subnet and the only address area within the range is selected. .

Thus, in the present invention, by applying different address generation methods according to the multicast range, the possibility of address duplication, delay time due to address assignment, and load due to address management are minimized.

Claims (4)

In the method of assigning a multicast address in IPv6, Determining, by the multicast address server, the subscriber prefix and the subnet ID from the router in the subnet when determining the global multicast address range; Determining an available address area from the obtained information and assigning a multicast address to the host; Generating a site-local multicast address and a link-local multicast address by assigning the multicast address. The method of claim 1, The address allocating step includes a step of securing a unique address area through a request for an address area to be used between servers in a subnet. The method of claim 1, And generating a first group ID value by combining a subnet ID, an interface ID, and an arbitrary 8-bit value by the host when generating the site-local multicast address. The method of claim 1, And generating a second group ID value by combining an interface ID and a predetermined 8-bit value by the host by itself when generating the link-local multicast address.