IPv4 neighbor function IPv6 neighbor function Description
verify that a neighbor is still
reachable through a cached
link-layer address. Y
ou can
also use neighbor
solicitations for duplicate
address detection.
ARP Reply message Neighbor advertisement A node sends this message
either in response to a
received neighbor
solicitation message or to
communicate a link layer
address change.
ARP cache Neighbor cache The neighbor cache contains
information about neighbor
types on the network.
Gratuitous ARP Duplicate address detection A host or node sends a
request with its own IP
address to determine if
another router or host uses
the same address. The
source receives a reply from
the duplicate device. Both
hosts and routers use this
function.
Router solicitation message
(optional)
Router solicitation (required) The host sends this message
upon detecting a change in a
network interface operational
state. The message requests
that routers generate router
advertisement immediately
rather than at the scheduled
time.
Router advertisement
message (optional)
Router advertisement
(required)
Routers send this message
to advertise their presence
together with various links
and Internet parameters
either periodically or in
response to a router
solicitation message. Router
advertisements contain
prefixes that you use for on-
link determination or address
configuration, and a
suggested hop limit value.
System configuration fundamentals
36 Configuration — System April 2011
To Next Page
Loading...
