Operating notes for ND
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A verified link-local unicast address must exist on a VLAN interface before the switch can run DAD on other addresses associated with the interface.
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If a previously configured unicast address is changed, a neighbor advertisement (an all-nodes multicast message--ff02::1) is sent to notify other devices on the VLAN and to perform DAD.
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IPv6 addresses on a VLAN interface are assigned to multicast address groups identified with well-known prefixes.
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DAD is performed on all stateful, stateless, and statically configured unicast addresses.
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Neighbor solicitations for DAD do not cause the neighbor cache of neighboring switches to be updated.
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If a previously configured unicast address is changed, a neighbor advertisement is sent on the VLAN to notify other devices and for duplicate address detection.
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If DAD is disabled when an address is configured, the address is assumed to be unique and is assigned to the interface.