25-5
Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 25 Configuring IPv6 Neighbor Discovery
Configuring Neighbor Solicitation Messages
Additional Guidelines and Limitations
• The interval value is included in all IPv6 router advertisements sent out this interface.
• The configured time enables detecting unavailable neighbors. Shorter configured times enable
detecting unavailable neighbors more quickly; however, shorter times consume more IPv6 network
bandwidth and processing resources in all IPv6 network devices. Very short configured times are not
recommended in normal IPv6 operation.
Default Settings for the Neighbor Reachable Time
Table 25-3 lists the default settings for neighbor reachable time parameters.
Configuring Neighbor Reachable Time
The neighbor reachable time enables detecting unavailable neighbors. Shorter configured times enable
detecting unavailable neighbors more quickly; however, shorter times consume more IPv6 network
bandwidth and processing resources in all IPv6 network devices. Very short configured times are not
recommended in normal IPv6 operation.
Valid time values range from 0 to 3600000 milliseconds. The default is 0; however, when you use 0, the
reachable time is sent as undetermined. It is up to the receiving devices to set and track the reachable
time value.
To configure the amount of time that a remote IPv6 node is considered reachable after a reachability
confirmation event has occurred, perform the following steps:
Step 1 Choose Configuration > Device Setup > Interfaces.
Step 2 Choose 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 Reachable Time field, enter a valid value.
Step 6 Click OK.
Step 7 Click Apply to save the configuration.
Configuring DAD Settings
Duplicate Address Detection (DAD) settings are part of the Neighbor Discovery configuration. DAD
verifies the uniqueness of new unicast IPv6 addresses before they are assigned and ensures that duplicate
IPv6 addresses are detected in the network on a link basis.
To specify DAD settings on the interface, perform the following steps:
Table 25-3 Default Neighbor Reachable Time Parameters
Parameters Default
value (time mode is reachable) The default is 0.
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