25-11
Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 25 Configuring IPv6 Neighbor Discovery
Configuring Router Advertisement Messages
Configuring 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 25-12. To prevent synchronization with other
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:
Step 1 Choose Configuration > Device Setup > Interfaces.
Step 2 Select the interface for which you want to configure the time.
The interface must have been configured with an IPv6 address. For more information, see the
“Configuring IPv6 Addresses on an Interface” section on page 25-6.
Step 3 Click Edit. The Edit Interface dialog box appears with three tabs: General, Advanced, and IPv6.
Step 4 Click the IPv6 tab.
Step 5 In the RA Interval field, enter a valid transmission interval value.
Note (Optional) To add a router advertisement transmission interval value in milliseconds instead,
check the RA Interval in Milliseconds check box, and enter a value from 500 to 1800000.
Step 6 Click OK.
Step 7 Click Apply to save the configuration.
Feature History for the Router Advertisement Transmission Interval
Table 25-6 lists the release history for this feature.
Table 25-6 Feature History for Router Advertisement Transmission Interval
Feature Name Releases Feature Information
Router advertisement transmission interval 7.0(1) The feature was introduced.
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