C
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| IP Interface Commands
IPv6 Interface
– 1417 –
Traceroute to FE80::2E0:CFF:FE9C:CA10%1/64, 30 hops max, timeout is 3
seconds, 5 max failure(s) before termination.
Hop Packet 1 Packet 2 Packet 3 IPv6 Address
--- -------- -------- -------- --------------------------------------------
1 <10 ms <10 ms <10 ms FE80::2E0:CFF:FE9C:CA10%1/64
Trace completed.
Console#
Neighbor Discovery
ipv6 nd dad
attempts
This command configures the number of consecutive neighbor solicitation
messages sent on an interface during duplicate address detection. Use the
no form to restore the default setting.
SYNTAX
ipv6 nd dad attempts count
no ipv6 nd dad attempts
count - The number of neighbor solicitation messages sent to
determine whether or not a duplicate address exists on this
interface. (Range: 0-600)
DEFAULT SETTING
3
COMMAND MODE
Interface Configuration (VLAN)
COMMAND USAGE
◆ Configuring a value of 0 disables duplicate address detection.
◆ Duplicate address detection determines if a new unicast IPv6 address
already exists on the network before it is assigned to an interface.
◆ Duplicate address detection is stopped on any interface that has been
suspended (see the vlan command). While an interface is suspended,
all unicast IPv6 addresses assigned to that interface are placed in a
“pending” state. Duplicate address detection is automatically restarted
when the interface is administratively re-activated.
◆ An interface that is re-activated restarts duplicate address detection for
all unicast IPv6 addresses on the interface. While duplicate address
detection is performed on the interface’s link-local address, the other
IPv6 addresses remain in a “tentative” state. If no duplicate link-local
address is found, duplicate address detection is started for the
remaining IPv6 addresses.
◆ If a duplicate address is detected, it is set to “duplicate” state, and a
warning message is sent to the console. If a duplicate link-local address
is detected, IPv6 processes are disabled on the interface. If a duplicate
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