ipv6 address eui-64

Function

The ipv6 address eui-64 command configures an EUI-64 global unicast address for an interface.

The undo ipv6 address eui-64 command deletes the configuration.

By default, no EUI-64 global unicast address is configured for an interface.

Format

ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length } eui-64

undo ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length } eui-64

Parameters

Parameter	Description	Value
ipv6-address	Specifies the IPv6 address to be configured for the interface.	The address is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X.
prefix-length	Specifies the prefix length of the IPv6 address.	The value is an integer that ranges from 1 to 128. In the EUI-64 address format, the prefix length must be less than 64.
ipv6-address/prefix-length	Specifies the IPv6 address and prefix length of an interface.	The value is the IPv6 address/IPv6 address prefix length.

Parameter

Description

Value

ipv6-address

Specifies the IPv6 address to be configured for the interface.

The address is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X.

prefix-length

Specifies the prefix length of the IPv6 address.

The value is an integer that ranges from 1 to 128. In the EUI-64 address format, the prefix length must be less than 64.

ipv6-address/prefix-length

Specifies the IPv6 address and prefix length of an interface.

The value is the IPv6 address/IPv6 address prefix length.

Views

100ge sub-interface view, 100GE interface view, 10GE sub-interface view, 10GE interface view, 200GE sub-interface view, 25GE sub-interface view, 25GE interface view, 400GE sub-interface view, 400GE interface view, 40GE sub-interface view, 40GE interface view, 50GE sub-interface view, 50GE interface view, Eth-Trunk sub-interface view, Eth-Trunk interface view, FlexE interface view, GE optical interface view, GE sub-interface view, GE interface view, GE electrical interface view, Global VE sub-interface view, Loopback interface view, PW-VE sub-interface view, PW-VE interface view, Tunnel interface view, VBDIF interface view, VE sub-interface view, VLANIF interface view, Management interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
interface-mgr	write

Usage Guidelines

Usage Scenario

In the IPv6 addressing scheme, every IPv6 unicast address needs an interface identifier. The interface identifier is unique, similar to a 48-bit MAC address.

The interface identifier of an IPv6 host address complies with the IEEE EUI-64 format. A 64-bit interface identifier is generated based on an existing MAC address; therefore, such an interface identifier is unique globally.

If the interface has been configured with a MAC address, the EUI-64 address is generated based on the MAC address of the interface, with FFFE added in the middle.

If the interface has not been configured with a MAC address, the EUI-64 address is generated based on the following rules:

For Layer 3 physical interfaces and sub-interfaces, the EUI-64 address is generated based on the MAC address of a physical interface, with FFFE added in the middle.
For loopback interfaces , VBDIF interfaces, and tunnel interface, the EUI-64 address is generated based on the MAC address of an interface, with the last two bytes following the interface index added in the middle.
For Eth-Trunk interfaces and its sub-interfaces, Global-VE sub-interfaces, VE sub-interfaces, and VLANIF interfaces, the EUI-64 address is generated based on the MAC address of an interface, with FFFE added in the middle.

Prerequisites

Before running the ipv6 address eui-64 command to configure an EUI-64 global unicast address for an interface, you need to run the ipv6 enable command in the interface view to enable the IPv6 function on the interface.

Configuration Impact

If the ipv6 address eui-64 is run to configure an EUI-64 IPv6 address for an interface but no link-local address is configured for the interface, the system automatically generates a link-local address for the interface.

Precautions

The following conditions are prohibited for different interfaces on the same device:

The EUI-64 IPv6 addresses are the same.
The network prefixes of the EUI-64 IPv6 addresses are the same. For example, if the IPv6 address of interface A is 2001:db8:1::1/32 and its network prefix is 2001:db8:: and the IPv6 address of interface B is 2001:db8::1/16 and its network prefix is 2001::, the configuration succeeds. If the IPv6 address of interface B is 2001:db8:2::1/32 and its network prefix is also 2001:db8::, the configuration fails.
An interface can be configured with a maximum of 16 global unicast addresses.
The following EUI-64 IPv6 addresses cannot be configured for an interface:
Loopback address (::1/128)
Unspecified address (::/128)
Multicast address
Anycast address
IPv4-mapped IPv6 addresses (0:0:0:0:0:FFFF:IPv4-address) can be configured on public networks but not on VPNs.
The ipv6 address command is used to specify a 128 bit IP address. Using the ipv6 address eui-64 command, you can specify the high-order 64 bits of an IPv6 address. The low-order 64 bits of an IP address are automatically generated in the EUI-64 format. Even when the low-order 64 bits are manually specified, the automatically generated ones will override them.

Example

# Configure an EUI-64 IPv6 address 2001:db8:1::1/64 for GE 0/1/1.

<HUAWEI> system-view
[~HUAWEI] interface GigabitEthernet0/1/1
[~HUAWEI-GigabitEthernet0/1/1] ipv6 enable
[*HUAWEI-GigabitEthernet0/1/1] ipv6 address 2001:db8:1::1 64 eui-64