Neighbor Cache - ZyXEL Communications VES1724-56 User Manual

45.2 Neighbor Cache

Click Management > IPv6 Cache in the navigation panel to open this screen. The neighbor cache
is similar to a MAC address table in IPv4. Use this screen to view the link-layer addresses of the
Switch's interfaces and neighboring devices. You can also see if a neighbor is still reachable from
the Switch.
Figure 242 IPv6 Cache > Neighbor Cache
The following table describes the labels in this screen.
Table 178 IPv6 Cache > Neighbor Cache
LABEL
reload
Index
Neighbor
MAC
State
VES1724-56 User's Guide
DESCRIPTION
Select ALL or a specific interface and then click the reload button to display
information about all or related IPv6 neighboring interfaces on this screen.
This is the index number of the entry.
This is the IPv6 address of a neighbor or the Switch's interface.
This is the MAC address of the interface on which the IPv6 address is configured.
This field displays whether the neighboring IPv6 interface is reachable. In IPv6,
"reachable" means an IPv6 packet can be correctly forwarded to a neighboring node
(host or router) and the neighbor can successfully receive and handle the packet. The
options that can display in this field are:
Reachable: The interface of the neighboring device is reachable. (The Switch has
received a response to its neighbor solicitation.)
Stale: The last reachable time has expired or the Switch received an unrequested
advertisement that updates the cached link-layer address from the neighboring
interface.
Delay: A packet is being sent to the neighboring interface in Stale state.The Switch
delays sending request packets for a short time to give upper-layer protocols a
chance to determine reachability. If no reachability confirmation is received within the
delay time period, the Switch sends a neighbor solicitation and changes the state to
Probe.
Probe: The Switch is sending neighbor solicitations and waiting for the neighbor's
response.
Invalid: The neighbor address is an invalid IPv6 address.
Unknown: The status of the neighboring interface cannot be determined.
Incomplete: Address resolution is in progress and the link-layer address of the
neighbor has not yet been determined (see RFC 4861). The interface of the
neighboring device did not give a complete response.
Chapter 45 IPv6 Cache
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