Setting Flags In Ipv6 Router Advertisement Messages - Dell PowerConnect B-RX Configuration Manual

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Configuring IPv6 neighbor discovery
Controlling prefixes advertised in IPv6 router advertisement messages
By default, router advertisement messages include prefixes configured as addresses on router
interfaces using the ipv6 address command. You can use the ipv6 nd prefix-advertisement
command to control exactly which prefixes are included in router advertisement messages. Along
with which prefixes the router advertisement messages contain, you can also specify the following
parameters:
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For example, to advertise the prefix 2001:e077:a487:7365::/64 in router advertisement messages
sent out on Ethernet interface 3/1 with a valid lifetime of 1000 seconds, a preferred lifetime of
800 seconds, and the Onlink and Autoconfig flags set, enter the following commands.
BigIron RX(config)# interface ethernet 3/1
BigIron RX(config-if-e100-3/1)# ipv6 nd prefix-advertisement
2001:e077:a487:7365::/64 1000 800 onlink autoconfig
Syntax: [no] ipv6 nd prefix-advertisement <ipv6-prefix>/<prefix-length> <valid-lifetime>
You must specify the <ipv6-prefix> parameter in hexadecimal using 16-bit values between colons
as documented in RFC 2373.
You must specify the <prefix-length> parameter as a decimal value. A slash mark (/) must follow
the <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 is
604800 seconds (7 days).
To remove a prefix from the router advertisement messages sent from a particular interface, use
the no form of this command.

Setting flags in IPv6 router advertisement messages

An IPv6 router advertisement message can include the following flags:
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Valid lifetime—(Mandatory) The time interval (in seconds) in which the specified prefix is
advertised as valid. The default is 2592000 seconds (30 days). When the timer expires, the
prefix is no longer considered to be valid.
Preferred lifetime—(Mandatory) The time interval (in seconds) in which the specified prefix is
advertised as preferred. The default is 604800 seconds (7 days). When the timer expires, the
prefix 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 it
is advertised. Nodes sending traffic to addresses that contain the specified prefix consider the
destination to be reachable on the local link.
Autoconfiguration flag—(Optional) If this flag is set, the stateless auto configuration feature can
use the specified prefix in the automatic configuration of 128-bit IPv6 addresses for hosts on
the local link.
<preferred-lifetime> [autoconfig] [onlink]
Managed Address Configuration—This flag indicates to hosts on a local link if they should use
the stateful autoconfiguration feature to get IPv6 addresses for their interfaces. If the flag is
set, the hosts use stateful autoconfiguration to get addresses as well as non-IPv6-address
information. If the flag is not set, the hosts do not use stateful autoconfiguration to get
addresses and if the hosts can get non-IPv6-address information from stateful
autoconfiguration is determined by the setting of the Other Stateful Configuration flag.
BigIron RX Series Configuration Guide
53-1001810-01