Cisco ASA 5505 Configuration Manual page 221

Chapter 7 Using the Startup Wizard
Router advertisement messages typically include the following information:
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Router advertisements are also sent in response to router solicitation messages (ICMPv6 Type 133).
Router solicitation messages are sent by hosts at system startup so that the host can immediately
autoconfigure without needing to wait for the next scheduled router advertisement message. Because
router solicitation messages are usually sent by hosts at system startup, and the host does not have a
configured unicast address, the source address in router solicitation messages is usually the unspecified
IPv6 address (0:0:0:0:0:0:0:0). If the host has a configured unicast address, the unicast address of the
interface sending the router solicitation message is used as the source address in the message. The
destination address in router solicitation messages is the all-routers multicast address with scope of the
link. When a router advertisement is sent in response to a router solicitation, the destination address in
the router advertisement message is the unicast address of the source of the router solicitation message.
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. For information about changing these settings, see the
following sections:
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Configuring the Router Advertisement Transmission Interval
By default, router advertisements are sent out every 200 seconds. Valid values range from 3 to 1800
seconds.
The interval between transmissions should be less than or equal to the IPv6 router advertisement lifetime
if the adaptive security appliance is configured as a default router. For more information, see the
"Configuring the Router Lifetime Value" section on page
IPv6 nodes, randomly adjust the actual value used to within 20 percent of the desired value.
To change the interval between router advertisement transmissions on an interface, perform the
following steps:
OL-20339-01
One or more IPv6 prefix that nodes on the local link can use to automatically configure their IPv6
addresses.
Lifetime information for each prefix included in the advertisement.
Sets of flags that indicate the type of autoconfiguration (stateless or stateful) that can be completed.
Default router information (whether the router sending the advertisement should be used as a default
router and, if so, the amount of time (in seconds) the router should be used as a default router).
Additional information for hosts, such as the hop limit and MTU a host should use in packets that it
originates.
The amount of time between neighbor solicitation message retransmissions on a given link.
The amount of time a node considers a neighbor reachable.
The time interval between periodic router advertisement messages.
The router lifetime value, which indicates the amount of time IPv6 nodes should consider the
adaptive security appliance to be the default router.
The IPv6 network prefixes used on the link.
Whether or not an interface transmits router advertisement messages.
Configuring the Router Advertisement Transmission Interval, page 7-23
Configuring the Router Lifetime Value, page 7-24
Suppressing Router Advertisement Messages, page 7-25
Configuring IPv6 Neighbor Discovery
7-24. To prevent synchronization with other
Cisco ASA 5500 Series Configuration Guide using ASDM
7-23