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IPv6 Addressing Commands
78-20269-01 Command Line Interface Reference Guide
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.
When DAD identifies a duplicate address, the address state is set to DUPLICATE
and the address is not used. If the duplicate address is the Link Local address of
the interface, the processing of IPv6 packets is disabled on the interface and an
error message is displayed.
All configuration commands associated with the duplicate address remain as
configured while the address state is set to DUPLICATE.
If the Link Local address for an interface changes, DAD is performed on the new
Link Local address and all of the other IPv6 address associated with the interface
are regenerated (DAD is performed only on the new Link Local address).
Configuring a value of 0 with the ipv6 nd dad attempts Interface Configuration
mode command disables duplicate address detection processing on the
specified interface. A value of 1 configures a single transmission without follow-up
transmissions. The default is 1 message.
Until the DAD process is completed, an IPv6 address is in the tentative state and
cannot be used for data transfer. It is recommended to limit the configured value.
Example
The following example configures the number of consecutive neighbor solicitation
messages sent during DAD processing to 2 on gi9.
Console (config)#
interface gi9
Console (config-if)#
36.12 ipv6 host
Use the ipv6 host Global Configuration mode command to define a static host
name-to-address mapping in the host name cache. Use the no form of this
command to remove the host name-to-address mapping.
Syntax
name ipv6-address1 [ipv6-address2...ipv6-address4]
ipv6 host
no ipv6 host name
ipv6 nd dad attempts
2
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