For the interval between neighbor solicitation messages and the value for the retrans timer in router advertisements, specify a number
from 0 - 4294967295 milliseconds. The default value for the interval between neighbor solicitation messages is 1000 milliseconds.
The default value for the retrans timer is 0. Brocade does not recommend very short intervals in normal IPv6 operation. When a non-
default value is congured, the congured time is both advertised and used by the router itself. To restore the default interval, use the no
form of this command.
Setting IPv6 router advertisement parameters
You can adjust the following parameters for router advertisement messages:
• 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 1/3/1, enter the following
commands.
device(config)#interface ethernet 1/3/1
device(config-if-e1000-1/3/1)#ipv6 nd ra-interval 300
device(config-if-e1000-1/3/1)#ipv6 nd ra-lifetime 1900
device(config-if-e1000-1/3/1)#ipv6 nd ra-hop-limit 1
Here is another example with a specied range.
device(config)#interface ethernet 1/3/1
device(config-if-e1000-1/3/1)#ipv6 nd ra-interval range 33 55
device(config-if-e1000-1/3/1)#ipv6 nd ra-lifetime 1900
device(config-if-e1000-1/3/1)#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
congured or default value. For example, in the above conguration, 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 species 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 specied by the max-range-value . The min-range-value can be a number between -3 - (.75 x max
range value ).
IPv6 neighbor discovery conguration
FastIron Ethernet Switch Layer 3 Routing
172 53-1003627-04
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