KR20080051309A - Method of configuring ipv6 link-local addresses using pseudo eui-64 identifiers irrespective of type of physical media - Google Patents

Abstract

A method for configuring IPv6 link-local addresses using pseudo EUI(Extended Unique Identifier)-64 identifiers is provided to configure the IPv6 addresses, even when plural systems are connected to a single subnet, by generating an identifier without using an identifier allocation token. An identifier for a user interface is allocated, so that IPv6(Internet Protocol version 6) link/lock addresses are configured. Vender ID information and system ID information are collected by using a MAC(Media Access Control) address of the user interface. Interface ID information is collected in a system by using physical position information of the user interface and a logical interface identifier. The identifier for the user interface is allocated by using the vender ID information, the interface ID information, and the system ID information.

Description

METHOD OF CONFIGURING IPv6 LINK-LOCAL ADDRESSES USING PSEUDO EUI-64 IDENTIFIERS IRRESPECTIVE OF TYPE OF PHYSICAL MEDIA}

1 is a flow diagram of a method for assigning an identifier for a subscriber interface, according to one embodiment.

2 is a diagram illustrating a process of collecting vendor identification information and system identification information using a MAC (Media Access Control) address of a management network according to an exemplary embodiment.

3 is a diagram illustrating a structure of an identifier obtained using collected vendor identification information, interface identification information, and system identification information, according to an exemplary embodiment.

The present invention relates to a method for generating an interface (physical medium) identifier when configuring an Internet Protocol version 6 (IPv6) link-local address. More specifically, the present invention provides a MAC (Media Access Control) address of a management network when it is impossible or difficult to configure an IPv6 link-local address by EUI-64 (64-bit Extended Unique Identifier) scheme. It relates to a method of constructing an IPv6 link-local address using other information. In addition, the present invention provides a different IPv6 link-local address for each subscriber interface regardless of the presence or absence of a hardware address of the subscriber interface in equipment in which a plurality of different types of subscriber interfaces are accommodated, such as router or switch equipment. It relates to how to configure.

IPv6 was designed as a set of protocols to improve the current IPv4. The most obvious improvement over IPv6 over IPv4 is that the length of the IP address has increased from 32 bits to 128 bits. This expansion has responded to the concern that the Internet will explode in the near future, resulting in a shortage of network addresses.

IPv6 has been improved over IPv4 as follows. First, you can describe the options in an extended header, which means that networking is fast overall because it is only retrieved at the destination. Second, IPv6 allows headers to be extended to specify mechanisms for packet origin authentication, data integrity, and confidentiality. Third, one of the most useful features of IPv6 is the ability to automatically configure itself. By default, IPv6 hosts can configure link-local addresses for each interface.

Conventional EUI How to Configure Interface Identifier According to -64 Method

According to the relevant standards of the Institute of Electrical and Electronic Engineers (IEEE), an EUI-64 address consists of a 24-bit company identifier assigned as a 64-bit identifier and a 40-bit extended identifier (or board identifier) assigned by the producer.

The interface identifier collection method according to the conventional EUI-64 method is as follows. EUI- from an IEEE 802 address (which uses a 48-bit address as an existing interface identifier for a network adapter, each consisting of a 24-bit company identifier and an extended identifier, also known as a physical hardware address or a media access control (MAC) address). To map 64 addresses, 16 bits of 0xFFFE are inserted into the IEEE 802 address between the company identifier and the extended identifier. The configured EUI-64 address requires universal / local (U / L) supplementation for the seventh bit of the first byte, with 1 being set to 0 and 0 to 1. The interface identifier configured in this way constitutes the lower 64 bits of the IPv6 link-local address.

In the above, the IPv6 link-local address configuration method using the conventional EUI-64 interface ID (interface ID) has been described. However, the following problem may occur when using this conventional method.

First, the IPv6 link-local address configuration using the EUI-64 interface identifier can be applied when the identifier of the link or the node itself of the interface is used. The interface identifier that can be used is a MAC address. It is a Link-Layer Interface Identifier, which is different from the logical interface identifier used to manage and operate multiple subscriber interfaces in routers or switch equipment. This is because logical interface identifiers are generally assigned sequentially according to the creation order of the interface regardless of the link-layer of the interface. When using the logical interface identifier to configure the link-local address in the EUI-64 manner, the logical interface identifier that the system uses to manage the interface does not consider other systems in the subnet and creates an interface inside the system. Since only the order is taken into consideration, there may be a problem in that the link-local address is overlapped with an interface of another system (router or switch) connected to the same subnet.

As a result, a logical interface identifier of one system may become the same as a logical interface identifier of another system. If the two systems are on the same subnet, the same IPv6 link-local address may be duplicated on different interfaces of different systems. It exists. As a result, in a system including an interface without a link-layer interface identifier, a problem arises in configuring an IPv6 link-local address.

Accordingly, an object of the present invention is to provide a method of configuring an IPv6 link-local address such that the same IPv6 link-local address does not exist on different interfaces of different systems.

Another object of the present invention is a method of configuring a different IPv6 link-local address for each subscriber interface regardless of the presence or absence of a hardware address of the subscriber interface in equipment in which multiple subscriber interfaces are accommodated in different physical types. To provide.

It is still another object of the present invention to provide a method for distinguishing all of the interfaces even if a plurality of interfaces exist in one link by using logical interface identifiers in addition to physical location information.

According to one embodiment, a method is provided for generating a new identifier for a subscriber interface to configure IPv6 link-local addresses in a system internal assignment scheme. The method includes collecting vendor identification information and system identification information using a MAC address of a subscriber interface, and collecting interface identification information within a system using physical location information and a logical interface identifier of the subscriber interface. And assigning an identifier for the subscriber interface using the vendor identification information, the interface identification information, and the system identification information. The method may further comprise an IPv6 link-local address configuration process using the identifier.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, a method for generating a new identifier distinguished between a system and a subnet is provided as one of a method for configuring an IPv6 link-local address using an internal system allocation scheme.

1 is a flowchart of a method for assigning an identifier for a subscriber interface, according to one embodiment. In step 102, vendor identification information and system identification information are collected using the MAC address of the subscriber interface. In one embodiment step 102 may be performed as follows. First, the MAC address of the subscriber interface is read. In a typical 48-bit Mac address, the upper 24 bits indicate the company identifier. The upper 24 bits of the Mac address read here are extracted, and the seventh bit from the upper is made '1' to collect 24-bit vendor identification information. . Typical 802.x (IEEE 802 standard refers to a set of LAN connection method and protocol standards developed by the IEEE 802 committee, which is driving the standardization of computer networks.) Universal / local (U / L) bits and personal in network adapter addresses The / group (I / G) bit is set to '0', which corresponds to the globally managed unicast MAC address, which is set to '1' to become a multicast address in unicast identifying a single interface. This conversion to multicast addresses is for the identification of the various interfaces, and the configured packets are delivered to all the interfaces whose addresses are identified through the appropriate multicast routing topology, which is used for one-to-many communication.

Second, the 16-bit system identification information is obtained by adding the lowest 8 bits of the upper 24 bits (same as the lowest 8 bits of the vendor identification information) and the highest 8 bits of the lower 24 bits in the MAC address of the management network read above. Collect (see FIG. 1).

Finally, the collected 24-bit vendor identification information (v) and 16-bit system identification information (s) are stored for use in the next step.

Then, in step 104, the interface identification in the system is collected using the physical location information and the logical interface identifier of the subscriber interface. In one embodiment, step 104 may be performed as follows. The subscriber interface is a logical interface but has a specific physical location (physical interface or physical port or link) within the system. This physical location information and the system collects 24-bit interface identification information using a logical interface identifier used internally for subscriber interface management.

First, the physical location information is determined by the switch port number (typically 0 to 15 or less) and the link number within the board where the subscriber interface is located. In this case, the switch port number of the board and the link number within the board are represented by 4 bits and 6 bits, respectively, so as to include the number of switch ports of the general system and the number of acceptable ports per board. A 14-bit logical interface identifier (ID) is added to the 10-bit physical location information thus collected. As described above, if a logical interface identifier is used in addition to the physical location information, even if a plurality of interfaces (logical interfaces) exist in one link, each interface can be distinguished. The following equation shows the interface identification information collected as described above.

24-bit interface identification (i) = switch port number (4 bits) + link number (6 bits) + interface ID (14 bits)

As shown in FIG. 1, in step 106, an identifier for a subscriber interface is assigned using the vendor identification information, the interface identification information, and the system identification information.

Step 106 constructs an identifier using the identification information obtained in steps 102 and 104 (may be referred to as 'similar EUI-64 type identifier'). First, the 24-bit vendor identification information (v) is placed at the top, followed by the 24-bit interface identification information (i), and finally the 16-bit system identification information (s) is added to form a 64-bit identifier. . 3 shows an identifier structure configured as described above. The method of obtaining an EUI-64 identifier from an existing 48-bit MAC address is as follows.

The method of obtaining an EUI-64 identifier from an existing 48-bit Mac address inserts 16 bits of 0xFFFE between the company identifier and the extended identifier of the Mac address. The configured EUI-64 address requires universal / local (U / L) supplementation for the seventh bit of the first byte, which is set to zero if one and zero if one. The interface identifier configured in this way constitutes the lower 64 bits of the IPv6 link-local address.

On the other hand, in the method of obtaining an identifier according to the present invention, the upper 24 bits are the same company identifier, and the lower 16 bits are values that can distinguish the system by the modified vendor extension identifier (as shown in FIG. 1). The 24 bits are the values that distinguish the interfaces in the system. The structure of the identifier thus constructed is shown in FIG. This becomes an identifier for configuring a different IPv6 link-local address for each subscriber interface regardless of whether there is a hardware address of the subscriber interface.

Finally, the IPv6 link-local address of the interface is configured using the identifier obtained in the above steps as the lower 64 bits of the IPv6 link-local address, which uses the lower 64 bits and is automatically used as in the existing EUI-64 method. It consists of.

According to the embodiments described above, it is easy to configure an IPv6 link-local address when it is difficult to configure an IPv6 link-local address by the conventional EUI-64 method, and even if multiple systems are connected to the same subnet, Allows you to configure IPv6 link-local addresses without affecting the system. In addition, the above embodiments automatically configure an IPv6 link-local address by creating an identifier similar to the EUI-64 scheme without the processing of a server or token for additional EUI-64 identifier assignment, and the similar EUI-64 identifier configured Allows you to configure non-duplicate IPv6 link-local addresses within a network.

Claims (6)

A method of assigning an identifier for a subscriber interface to configure an Internet Protocol version 6 (IPv6) link-local address, Collecting vendor identification information and system identification information using a MAC address of the subscriber interface; Collecting interface identification information in a system using physical location information and a logical interface identifier of the subscriber interface, and Assigning an identifier for the subscriber interface using the vendor identification information, the interface identification information, and the system identification information. How to include. The method of claim 1, The vendor identification information and system identification information collection step, Extracting the upper 24 bits of the MAC address and collecting vendor identification information for converting the seventh bit from the upper part into '1', and And collecting system identification information that adds the lowest 8 bits of the upper 24 bits of the MAC address and the highest 8 bits of the lower 24 bits. The method of claim 1, Collecting interface identification information in the system includes collecting physical location information representing the values in 4 bits and 6 bits, respectively, using the switch port number of the board where the subscriber interface is located and the link number in the board. How to. The method of claim 3, And collecting the identification information of the subscriber interface further comprises adding the logical interface identifier after the collected physical location information to make different values of a plurality of logical interfaces existing in the same physical link. 2. The method of claim 1, further comprising automatically assigning the generated identifier to IPv6 lower 64-bit to configure an IPv6 link-local address. A computer readable storage medium having stored thereon computer executable instructions for performing a method according to any one of claims 1 to 5.

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