Cisco PIX 500 Series Configuration Manual page 200

Configuring IPv6
You can configure the following settings for router advertisement messages:
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Unless otherwise noted, the router advertisement message settings are specific to an interface and are
entered in interface configuration mode. See the following topics for information about changing these
settings:
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Configuring the Router Advertisement Transmission Interval
By default, router advertisements are sent out every 200 seconds. To change the interval between router
advertisement transmissions on an interface, enter the following command:
ipv6 nd ra-interval [msec] value
Valid values range from 3 to 1800 seconds (or 500 to 1800000 milliseconds if the msec keyword is used).
The interval between transmissions should be less than or equal to the IPv6 router advertisement lifetime
if the security appliance is configured as a default router by using the ipv6 nd ra-lifetime command. To
prevent synchronization with other IPv6 nodes, randomly adjust the actual value used to within 20
percent of the desired value.
Configuring the Router Lifetime Value
The router lifetime value specifies how long nodes on the local link should consider the security
appliance the default router on the link.
To configure the router lifetime value in IPv6 router advertisements on an interface, enter the following
command:
hostname(config-if)# ipv6 nd ra-lifetime seconds
Valid values range from 0 to 9000 seconds. The default is 1800 seconds. Entering 0 indicates that the
security appliance should not be considered a default router on the selected interface.
Configuring the IPv6 Prefix
Stateless autoconfiguration uses IPv6 prefixes provided in router advertisement messages to create the
global unicast address from the link-local address.
To configure which IPv6 prefixes are included in IPv6 router advertisements, enter the following
command:
hostname(config-if)# ipv6 nd prefix ipv6-prefix / prefix-length
Note For stateless autoconfiguration to work properly, the advertised prefix length in router advertisement
messages must always be 64 bits.
Cisco Security Appliance Command Line Configuration Guide
12-10
The time interval between periodic router advertisement messages.
The router lifetime value, which indicates the amount of time IPv6 nodes should consider the
security appliance to be the default router.
The IPv6 network prefixes in use on the link.
Whether or not an interface transmits router advertisement messages.
Configuring the Router Advertisement Transmission Interval, page 12-10
Configuring the Router Lifetime Value, page 12-10
Configuring the IPv6 Prefix, page 12-10
Suppressing Router Advertisement Messages, page 12-11
Chapter 12 Configuring IPv6
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