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IPv6 Interface Commands
60-24
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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 global unicast
address is detected, it is not used. All configuration commands associated
with a duplicate address remain configured while the address is in “duplicate”
state.
• If the link-local address for an interface is changed, duplicate address
detection is performed on the new link-local address, but not for any of the
IPv6 global unicast addresses already associated with the interface.
Example
The following configures five neighbor solicitation attempts for addresses configured
on VLAN 1. The show ipv6 interface command indicates that the duplicate address
detection process is still on-going.
Related Commands
ipv6 nd ns interval (60-25)
show ipv6 neighbors (60-26)
Console(config)#interface vlan 1
Console(config-if)#ipv6 nd dad attempts 5
Console(config-if)#end
Console#show ipv6 interface
Vlan 1 is up
IPv6 is stalled.
Link-local address:
FE80::200:E8FF:FE90:0/64 [TENTATIVE]
Global unicast address(es):
2009:DB9:2229::79, subnet is 2009:DB9:2229:0::/64 [TENTATIVE]
Joined group address(es):
FF01::1/16
FF02::1/16
FF02::1:FF00:79/104
FF02::1:FF90:0/104
MTU is 1500 bytes.
ND DAD is enabled, number of DAD attempts: 5.
ND retransmit interval is 1000 milliseconds
Console#