Configuration Guide User guide

388 FastIron Configuration Guide
53-1002494-02
IPv6 neighbor discovery configuration
• The interval (in seconds) at which an interface sends router advertisement messages. By
default, an interface sends a router advertisement message every 200 seconds.
• The "router lifetime" value, which is included in router advertisements sent from a particular
interface. The value (in seconds) indicates if the router is advertised as a default router on this
interface. If you set the value of this parameter to 0, the router is not advertised as a default
router on an interface. If you set this parameter to a value that is not 0, the router is advertised
as a default router on this interface. By default, the router lifetime value included in router
advertisement messages sent from an interface is 1800 seconds.
• The hop limit to be advertised in the router advertisement.
When adjusting these parameter settings, Brocade recommends that the interval between router
advertisement transmission be less than or equal to the router lifetime value if the router is
advertised as a default router. For example, to adjust the interval of router advertisements to 300
seconds and the router lifetime value to 1900 seconds on Ethernet interface 3/1, enter the
following commands.
Brocade(config)#interface ethernet 3/1
Brocade(config-if-e1000-3/1)#ipv6 nd ra-interval 300
Brocade(config-if-e1000-3/1)#ipv6 nd ra-lifetime 1900
Brocade(config-if-e1000-3/1)#ipv6 nd ra-hop-limit 1
Here is another example with a specified range.
Brocade(config)#interface ethernet 3/1
Brocade(config-if-e1000-3/1)#ipv6 nd ra-interval range 33 55
Brocade(config-if-e1000-3/1)#ipv6 nd ra-lifetime 1900
Brocade(config-if-e1000-3/1)#ipv6 nd ra-hop-limit 1
Syntax: [no] ipv6 nd ra-interval <number> | <min range value> <max range value>
Syntax: [no] ipv6 nd ra-lifetime <number>
Syntax: ipv6 nd ra-hop-limit <number>
<number> is a value from 0 – 255. The default is 64.
The ipv6 nd ra-interval <number> can be a value between 3 – 1800 seconds. The default is 200
seconds. The actual RA interval will be from .5 to 1.5 times the configured or default value. For
example, in the above configuration, for ipv6 nd ra-interval 300, the range would be 150 – 450. To
restore the default interval of 200 seconds, use the no form of the command.
The ipv6 nd ra-interval range <min range value> <max range value> command lets you specify a
range of values instead of a single value.
The <min range value> specifies the minimum number of seconds allowed between sending
unsolicited multicast router advertisements from the interface. The default is 0.33 times the
<max range value> if the <max range value> is greater than or equal to 9 seconds. Otherwise,
the default is the value specified by the <max range value>. The <min range value> can be a
number between -3 – (.75 x <max range value>).
The <max range value> parameter specifies 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.