H3C S3610-28P, Operation Manual, Page: 276 / 1547

Operation Manual – IPv6
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 IPv6 Basics Configuration
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Figure 1-3 Address resolution
The address resolution procedure is as follows:
1) Node A multicasts an NS message. The source address of the NS message is the
IPv6 address of an interface of node A and the destination address is the
solicited-node multicast address of node B. The NS message contains the
link-layer address of node A.
2) After receiving the NS message, node B judges whether the destination address
of the packet corresponds to the solicited-node multicast address. If yes, node B
can learn the link-layer address of node A, and unicasts an NA message
containing its link-layer address.
3) Node A acquires the link-layer address of node B from the NA message.
II. Neighbor reachability detection
After node A acquires the link-layer address of its neighbor node B, node A can verify
whether node B is reachable according to NS and NA messages.
1) Node A sends an NS message whose destination address is the IPv6 address of
node B.
2) If node A receives an NA message from node B, node A considers that node B is
reachable. Otherwise, node B is unreachable.
III. Duplicate address detection
After node A acquires an IPv6 address, it will perform duplicate address detection (DAD)
to determine whether the address is being used by other nodes (similar to the
gratuitous ARP function of IPv4). DAD is accomplished through NS and NA messages.
Figure 1-4 shows the DAD procedure.