3Com 4500 PWR 26-Port Configuration Manual page 815

ICMPv6 message
Router solicitation (RS) message
Router advertisement (RA) message
Redirect message
The 3com switch 4500 does not support the RS, RA, or Redirect message.
Of the above mentioned IPv6 NDP functions, 3com switches 4500 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.
address of node B.
Figure 68-3 Address resolution
The address resolution procedure is as follows:
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 68-3 shows how node A acquires the link-layer
68-6
Function