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Configuring IPv6 569
–
Reachable
— Positive confirmation was received within the last Reachable Time milliseconds that
the forward path to the neighbor was functioning properly. While in REACH state, the device
takes no special action as packets are sent.
–
Stale
— More than ReachableTime milliseconds have elapsed since the last positive confirmation
was received that the forward path was functioning properly. While in STALE state, the device
takes no action until a packet is sent.
–
Delay
— More than ReachableTime milliseconds have elapsed since the last positive confirmation
was received that the forward path was functioning properly. A packet was sent within the last
DELAY_FIRST_PROBE_TIME seconds. If no reachability confirmation is received within
DELAY_FIRST_PROBE_TIME seconds of entering the DELAY state, send a neighbor
solicitation message and change the state to PROBE.
–
Probe
— A reachability confirmation is actively sought by resending neighbor solicitation
messages every RetransTimer milliseconds until a reachability confirmation is received.
•
Last Updated
— Time since the address was confirmed to be reachable.
Displaying IPv6 Neighbor Table
1.
Open the
IPv6 Neighbor Table
page.
2.
Select the interface to be displayed from the
Interface
drop-down menu.
Neighbor details for the selected interface display.
Displaying IPv6 Neighbor Table using the CLI Command
For information about the CLI commands that perform this function, see the following chapter in the
CLI Reference Guide
:
• IPv6 Routing Commands
DHCPv6
DHCP is generally used between clients (for example hosts) and servers (for example routers) for the
purpose of assigning IP addresses, gateways, and other networking definitions such as DNS, NTP, and/or
Session Initiation Protocol (SIP) parameters. However, IPv6 natively provides for auto configuration of IP
addresses through IPv6 Neighbor Discovery Protocol (NDP) and the use of Router Advertisement
messages. Thus, the role of DHCPv6 within the network is different than that of DHCPv4 in that it is
less relied upon for IP address assignment.
There is a list of DHCP options that is commonly supported by DHCPv4 that need to be supported also
by DHCPv6, and must be configured.
Note: The most important DHCP option to configure is the DNS Server option, which is configured on the IPv6 →
DHCPv6 → Pool Configuration web page.