Layer 3 Routing Commands 1514ipv6 addressUse the ipv6 address command in Interface Configuration mode to configurean IPv6 address on an interface (including VLAN, tunnel and loopbackinterfaces) and to enable IPv6 processing on this interface. Multiple globallyreachable addresses can be assigned to an interface by using this command.There is no need to assign a link-local address by using this command sinceone is automatically created. IPv6 addresses can be expressed in eight blocks.Also of note is that instead of a period, a colon separates each block. Forsimplification, leading zeros of each 16-bit block can be omitted. Onesequence of 16-bit blocks containing only zeros can be replaced with a doublecolon “::”, but not more than one at a time (otherwise it is no longer a uniquerepresentation).Dropping zeros: 3ffe:ffff:100:f101:0:0:0:1 becomes 3ffe:ffff:100:f101::1Local host: 0000:0000:0000:0000:0000:0000:0000:0001 becomes ::1Any host: 0000:0000:0000:0000:0000:0000:0000:0000 becomes ::The hexadecimal letters in the IPv6 addresses are not case-sensitive. Anexample of an IPv6 prefix and prefix length is 3ffe:1::1234/64.Syntaxipv6 address prefix/prefix-length [eui64]no ipv6 address [prefix/prefix-length] [eui64]• prefix — Consists of the bits of the address to be configured.• prefix-length — Designates how many of the high-order contiguous bits ofthe address make up the prefix.• eui64 — The optional eui-64 field designates that IPv6 processing on theinterfaces is enabled using an EUI-64 interface ID in the low order 64 bitsof the address. If this option is used, the value of prefix_length must be 64bits.Default ConfigurationThis command has no default configuration.Command ModeInterface Configuration (VLAN, Tunnel, Loopback) mode.
