IPv6 Addressing Configuration
Duplicate Address Detection (DAD)
that includes its
W< date > < time > 00019 ip: ip address <
DAD does not perform periodic checks of existing addresses. However, when a VLAN comes up with IPv6 unicast addresses configured (as can occur during a reboot) the switch runs DAD for each address on the interface by sending neighbor solicitations to the
If an address is configured while DAD is disabled, the address is assumed to be unique and is assigned to the interface. If you want to verify the uniqueness of an address configured while DAD was disabled,
Configuring DAD
Syntax: ipv6 nd
This command is executed at the global config level, and configures the number of neighbor solicitations to send when performing duplicate address detection for a unicast address configured on a VLAN interface.
<0 - 600 >: The number of consecutive neighbor solicitation messages sent for DAD inquiries on an interface. Setting this value to 0 disables DAD on the interface. Disabling DAD bypasses checks for uniqueness on newly configured addresses. If a reboot is performed while DAD is disabled, the duplicate address check is not performed on any IPv6 addresses configured on the switch.
Default: 3 (enabled); Range: 0 - 600 (0 = disabled)
The no form of the command restores the default setting (3).