1100 BigIron RX Series Configuration Guide53-1002253-01Configuring IPv6 neighbor discovery43Syntax: [no] ipv6 nd ra-interval <number>Syntax: [no] ipv6 nd ra-lifetime <number>The <number> parameter in both commands indicates any numerical value. To restore the defaultinterval or router lifetime value, use the no form of the respective command.Controlling prefixes advertised in IPv6 router advertisementmessagesBy default, router advertisement messages include prefixes configured as addresses on routerinterfaces using the ipv6 address command. You can use the ipv6 nd prefix-advertisementcommand to control exactly which prefixes are included in router advertisement messages. Alongwith which prefixes the router advertisement messages contain, you can also specify the followingparameters:• Valid lifetime—(Mandatory) The time interval (in seconds) in which the specified prefix isadvertised as valid. The default is 2592000 seconds (30 days). When the timer expires, theprefix is no longer considered to be valid.• Preferred lifetime—(Mandatory) The time interval (in seconds) in which the specified prefix isadvertised as preferred. The default is 604800 seconds (7 days). When the timer expires, theprefix is no longer considered to be preferred.• Onlink flag—(Optional) If this flag is set, the specified prefix is assigned to the link upon which itis advertised. Nodes sending traffic to addresses that contain the specified prefix consider thedestination to be reachable on the local link.• Autoconfiguration flag—(Optional) If this flag is set, the stateless auto configuration feature canuse the specified prefix in the automatic configuration of 128-bit IPv6 addresses for hosts onthe local link.For example, to advertise the prefix 2001:e077:a487:7365::/64 in router advertisement messagessent out on Ethernet interface 3/1 with a valid lifetime of 1000 seconds, a preferred lifetime of800 seconds, and the Onlink and Autoconfig flags set, enter the following commands.BigIron RX(config)# interface ethernet 3/1BigIron RX(config-if-e100-3/1)# ipv6 nd prefix-advertisement2001:e077:a487:7365::/64 1000 800 onlink autoconfigSyntax: [no] ipv6 nd prefix-advertisement <ipv6-prefix>/<prefix-length> <valid-lifetime><preferred-lifetime> [autoconfig] [onlink]You must specify the <ipv6-prefix> parameter in hexadecimal using 16-bit values between colonsas documented in RFC 2373.You must specify the <prefix-length> parameter as a decimal value. A slash mark (/) must followthe <ipv6-prefix> parameter and precede the <prefix-length> parameter.The valid lifetime and preferred lifetime is a numerical value between 0 – 4294967295 seconds.The default valid lifetime is 2592000 seconds (30 days), while the default preferred lifetime is604800 seconds (7 days).To remove a prefix from the router advertisement messages sent from a particular interface, usethe no form of this command.
