IPv4 neighbor function IPv6 neighbor function Description
Redirect message Redirect message Routers send this message
to inform
hosts of a better first
hop for a destination.
Neighbor discovery cache
The neighbor discovery cache lists information about neighbors in your network.
The neighbor discovery cache can contain the following types of neighbors:
• static: a configured neighbor
•
local: a device on the local system
• dynamic: a discovered neighbor
The following table describes neighbor cache states.
Table 7: Neighbor cache states
State Description
Incomplete A node sends a neighbor solicitation
message to
a multicast device. The multicast
device sends no neighbor advertisement
message in response.
Reachable You receive positive confirmation within the
last reachable time period.
Stale A node receives no positive confirmation
from the neighbor in the last reachable time
period.
Delay A time period longer than the reachable time
period passes since the node received the
last positive confirmation, and a packet was
sent within the last
DELAY_FIRST_PROBE_TIME period. If no
reachability confirmation is received within
DELAY_FIRST_PROBE_TIME period of
entering the DELAY state, neighbor
solicitation is sent and the state is changed
to PROBE.
Probe Reachability confirmation is sought from the
device every retransmit timer period.
IPv6 management
Configuration — System April 2011 37
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