3Com 4210 9-Port Configuration Manual page 758

Table 1-3 Types and functions of ICMPv6 messages
ICMPv6 message
Neighbor solicitation (NS) message
Neighbor advertisement (NA)
message
Router solicitation (RS) message
Router advertisement (RA)
message
Redirect message
3Com Switch 4210 Family do not support RS, RA, or Redirect message.
Of the above mentioned IPv6 NDP functions, 3Com Switch 4210 Family support the following three
functions: address resolution, neighbor unreachability detection, and duplicate address detection.
The subsequent sections present a detailed description of these three functions and relevant
configuration.
The NDP mainly provides the following functions:
Address resolution
Similar to the ARP function in IPv4, a node acquires the link-layer address of neighbor nodes on the
same link through NS and NA messages.
of node B.
Used to acquire the link-layer address of a neighbor
Used to verify whether the neighbor is reachable
Used to perform a duplicate address detection
Used to respond to a neighbor solicitation message
When the link layer address changes, the local node initiates
a neighbor advertisement message to notify neighbor nodes
of the change.
After started, a host sends a router solicitation message to
request the router for an address prefix and other
configuration information for the purpose of
autoconfiguration.
Used to respond to a router solicitation message
With the RA message suppression disabled, the router
regularly sends a router advertisement message containing
information such as address prefix and flag bits.
When a certain condition is satisfied, the default gateway
sends a redirect message to the source host so that the host
can reselect a correct next hop router to forward packets.
Figure 1-3 shows how node A acquires the link-layer address
1-6
Function