Operating notes for ND

  • 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.

  • 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.

  • IPv6 addresses on a VLAN interface are assigned to multicast address groups identified with well-known prefixes.

  • DAD is performed on all stateful, stateless, and statically configured unicast addresses.

  • Neighbor solicitations for DAD do not cause the neighbor cache of neighboring switches to be updated.

  • 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.

  • If DAD is disabled when an address is configured, the address is assumed to be unique and is assigned to the interface.