H3C S3610-28P Operation Manual page 277

Operation Manual – IPv6
H3C S3610&S5510 Series Ethernet Switches
Figure 1-4 Duplicate address detection
The DAD procedure is as follows:
1) Node A sends an NS message whose source address is the unassigned address ::
and destination address is the corresponding solicited-node multicast address of
the IPv6 address to be detected. The NS message contains the IPv6 address.
2) If node B uses this IPv6 address, node B returns an NA message. The NA
message contains the IPv6 address of node B.
3) Node A learns that the IPv6 address is being used by node B after receiving the
NA message from node B. Otherwise, node B is not using the IPv6 address and
node A can use it.
IV. Router/prefix discovery and address autoconfiguration
Router/prefix discovery means that a node locates the neighboring routers, and learns
the prefix of the network where the host is located, and other configuration parameters
from the received RA message.
Stateless address autoconfiguration means that a node automatically configures an
IPv6 address according to the information obtained through router/prefix discovery.
The router/prefix discovery is implemented through RS and RA messages. The
router/prefix discovery procedure is as follows:
1) After started, a node sends an RS message to request the router for the address
prefix and other configuration information for the purpose of autoconfiguration.
2) The router returns an RA message containing information such as prefix
information option. (The router also regularly sends an RA message.)
3) The node automatically configures an IPv6 address and other information for its
interface according to the address prefix and other configuration parameters in the
RA message.
Chapter 1 IPv6 Basics Configuration
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