HP 6120XG HP ProCurve Series 6120 Blade Switches IPv6 Configuration Guide - Page 53
Extended Unique Identifier (EUI), ipv6 address dhcp full, ipv6 enable, ipv6 address autoconfig
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IPv6 Addressing Link-Local Unicast Address Note Because all VLANs configured on the switch use the same MAC address, all automatically generated link-local addresses on the switch will have the same link-local address. However, since the scope of a link-local address includes only the VLAN on which it was generated, this should not be a problem. For example, executing ipv6 address dhcp full on a VLAN for which IPv6 was not previously configured does all of the following: ■ enables IPv6 on the VLAN ■ causes the switch to generate a stateless link-local unicast address on the VLAN ■ configures the VLAN to send DHCPv6 requests Only one link-local unicast address can exist on a VLAN interface at any time. Configuring a new address of this type on an interface on which IPv6 is already enabled replaces the previously existing link-local address with the new one. Any link-local address must include the well-known link-local prefix fe80::/64 plus a 64-bit device identifier. Any of the following commands enable IPv6 on a VLAN and automatically generate a link-local address: ■ ipv6 enable (page 4-6) ■ ipv6 address autoconfig (page 4-7) ■ ipv6 address dhcp full [rapid-commit] (page 4-9) ■ ipv6 address < network-prefix>/< prefix-length > (page 4-13) Extended Unique Identifier (EUI) When the link-local address is automatically generated, the device identifier is derived from the switch's 48- bit (hexadecimal) MAC address to create a 64bit Extended Unique Identifier (EUI) to be appended to the fe80 link-local prefix, as follows: ■ ff-fe is inserted between third and fourth bytes of MAC address ■ The second low-order bit (the Universal/Local bit) in the first byte of the MAC address is complemented, which usually means the bit is originally set to 0 and is changed to 1. This indicates a globally unique IPv6 interface identifier. For example: 3-14