The max-range-value parameter species the maximum number of seconds allowed between sending unsolicited multicast router
advertisements from the interface. This number can be between 4 - 1800 seconds and must be greater than the min-range-value x
1.33. The default is 600 seconds.
The ipv6 nd ra-lifetime number is a value between 0 - 9000 seconds. To restore the router lifetime value of 1800 seconds, use the no
form of the command.
The ipv6 nd ra-hop-limit number is a value from 0 - 255. The default is 64.
NOTE
By default, router advertisements will always have the MTU option. To suppress the MTU option, use the following command at
the Interface level of the CLI: ipv6 nd suppress-mtu-option .
Prexes advertised in IPv6 router advertisement messages
By default, router advertisement messages include
prexes congured as addresses on router interfaces using the ipv6 address
command. You can use the ipv6 nd prex-advertisement command to control exactly which prexes are included in router
advertisement messages. Along with which prexes the router advertisement messages contain, you can also specify the following
parameters:
• Valid lifetime --(Mandatory) The time interval (in seconds) in which the specied prex is advertised as valid. The default is
2592000 seconds (30 days). When the timer expires, the prex is no longer considered to be valid.
• Preferred lifetime --(Mandatory) The time interval (in seconds) in which the specied prex is advertised as preferred. The
default is 604800 seconds (7 days). When the timer expires, the prex is no longer considered to be preferred.
• Onlink ag --(Optional) If this ag is set, the specied prex is assigned to the link upon which it is advertised. Nodes sending
trac to addresses that contain the specied prex consider the destination to be reachable on the local link.
• Autoconguration ag --(Optional) If this ag is set, the stateless auto conguration feature can use the specied prex in the
automatic conguration of 128-bit IPv6 addresses for hosts on the local link, provided the specied prex is aggregatable, as
specied in RFC 2374.
For example, to advertise the prex 2001:DB8:a487:7365::/64 in router advertisement messages sent out on Ethernet interface 1/3/1
with a valid lifetime of 1000 seconds, a preferred lifetime of 800 seconds, and the Onlink and Autocong ags set, enter the following
commands.
device(config)#interface ethernet 1/3/1
device(config-if-e1000-1/3/1)#ipv6 nd prefix-advertisement 2001:DB8:a487:7365::/64 1000 800 onlink
autoconfig
Syntax: [no] ipv6 nd
prex-advertisement ipv6-prex/prex-length valid-lifetime preferred-lifetime [ autocong ] [ onlink ]
You must specify the ipv6-prex parameter in hexadecimal using 16-bit values between colons as documented in RFC 2373.
You must specify the prex-length parameter as a decimal value. A slash mark (/) must follow the ipv6-prex parameter and precede the
prex-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 prex from the router advertisement messages sent from a particular interface, use the no form of this command.
IPv6 neighbor discovery conguration
FastIron Ethernet Switch Layer 3 Routing
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