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Command Reference Guide
ipv6 nd dad attempts <number>
Use the ipv6 nd dad attempts command to specify the number of neighbor solicitation (NS) messages
sent by the interface when performing Internet Protocol version 6 (IPv6) duplicate address detection
(DAD). This command is effectual when the interface is in either host or router mode. Use the no form of
this command to return to the default value.
Syntax Description
<number>
Default Values
By default, the interface sends 1 NS message.
Command History
Release 18.1
Functional Notes
DAD is used by devices to determine if IPv6 addresses are unique before they are applied to interfaces.
DAD is used in NS messages to detect duplicate unicast addresses. The Target Address fields in the NS
messages are set to the IPv6 address for which duplication is being detected. Destination IPv6 addresses
for DAD in NS messages are the solicited-node multicast version of the address being tested. Source IPv6
addresses for DAD are set to the IPv6 unspecified address (::). Once the IPv6 address is determined by
DAD to be unique, it can be applied to the IPv6 interface on the node.
DAD in AOS is performed when an interface transitions state from DOWN to UP or when manually
configuring an address. When performing DAD because of an interface transition, DAD will happen
immediately after the interface transition and again 40 seconds later to cooperate with the port being
connected to an Ethernet switch.
Usage Examples
The following example specifies that 3 NS messages are sent by the interface when performing DAD:
(config)#interface ppp 1
(config-ppp 1)#ipv6 nd dad attempts 3
60000CRG0-35E
Specifies the number of NS messages that will be sent. Range is 0 to 10
messages. A value of 0 disables DAD on the interface.
Command was introduced.
Copyright © 2012 ADTRAN, Inc.
PPP Interface Command Set
2546
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