Enterasys Networks 9034313-07 manual No‐autoconfig, Off‐link

ipv6 nd prefix

Parameters

ipv6‐prefix/prefix‐length	The IPv6 network prefix and the prefix length being configured.
	The prefix must be in the form documented in RFC 4291, with the
	address specified in hexadecimal using 16‐bit values between colons.
	The prefix length is a decimal number indicating the number of high‐
	order contiguous bits of the address that comprise the network portion
	of the address.
valid‐lifetime infinite	(Optional) Specifies the length of time in seconds (relative to the time
	the packet is sent) that the prefix is valid for the purpose of on‐link
	determination.
	The lifetime value can range from 0 to 4,294,967,295.
	Specifying infinite means that the prefix is always valid.
preferred‐lifetime	(Optional) Specifies the length of time in seconds (relative to the time
infinite	the packet is sent) that addresses generated from the prefix by means of
	stateless address autoconfiguration remain preferred.
	The lifetime value can range from 0 to 4,294,967,295.
	Specifying infinite means that the prefix is always preferred.
no‐autoconfig	Unsets the autonomous address‐configuration flag. When not set,
	means that this prefix cannot be used for autonomous address
	configuration. By default, the autonomous address‐configuration flag is
	set/enabled.
off‐link	Unsets the on‐link flag. When not set, means that this prefix cannot be
	used for on‐link determination. By default, the on‐link flag is set/
	enabled.

Defaults

•Valid‐lifetime — 604800

•Preferred‐lifetime — 2592000

•Autoconfig — enabled

•On‐link — enabled

Mode

Router interface configuration:C3(su)‐>router(Config‐if (Vlan 1))#

Usage

Refer to RFC 2461, “Neighbor Discovery for IP Version 6,” for more information about router advertisements.

Router advertisements contain a list of prefixes used for on‐link determination and/or autonomous address configuration. Flags associated with the prefixes specify the intended uses of a particular prefix. Hosts use the advertised on‐link prefixes to build and maintain a list that is used in deciding when a packet’s destination is on‐link or beyond a router. Hosts can use the advertised autoconfiguration prefixes to perform autonomous (stateless) address configuration, if stateless configuration is allowed (see ipv6 nd other‐config‐flag).

The no form of this command removes the prefix from the list of prefixes advertised in router advertisements by this interface.

22-20 IPv6 Configuration