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IPv6 Addressing Commands
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CLI\files\IPv6_Addressing.fm
D E L L C O N F ID E N T IA L – P R E L IM I N A RY 5 / 1 5 /1 2 - F O R P R O O F O N LY
ipv6 nd dad attempts
Use the
ipv6 nd dad attempts
Interface Configuration (Ethernet, VLAN,
Port-channel) mode command to configure the number of consecutive
neighbor solicitation messages that are sent on an interface while Duplicate
Address Detection (DAD) is performed on the unicast IPv6 addresses of the
interface. Use the
no
form of this command to restore the number of
messages to the default value.
Syntax
ipv6 nd dad attempts
attempts
Parameters
attempts
—Specifies the number of neighbor solicitation messages. A value of
0 disables DAD processing on the specified interface. A value of 1 configures
a single transmission without follow-up transmissions. (Range: 0–600)
Default Configuration
Duplicate Address Detection on unicast IPv6 addresses with the sending of
one neighbor solicitation message is enabled.
Command Mode
Interface Configuration (Ethernet, VLAN, Port-channel) mode. It cannot be
configured for a range of interfaces (range context).
User Guidelines
Duplicate Address Detection (DAD) verifies the uniqueness of new unicast
IPv6 addresses before the addresses are assigned to interfaces (the new
addresses remain in a tentative state while DAD is performed). DAD uses
neighbor solicitation messages to verify the uniqueness of unicast IPv6
addresses.
An interface returning to the administrative Up state restarts DAD for all of
the unicast IPv6 addresses on the interface. While DAD is performed on the
Link Local address of an interface, the state of the other IPv6 addresses is still
set to TENTATIVE. When DAD is completed on the Link Local address,
DAD is performed on the remaining IPv6 addresses.
