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Command Reference Guide
ipv6 neighbor <ipv6 address> <interface> <mac address>
Use the ipv6 neighbor command to manually enter a static entry into the Internet Protocol version 6
(IPv6) Neighbor Discovery (ND) cache. Use the no form of this command to remove the static entry from
the neighbor cache.
Syntax Description
<ipv6 address>
<interface>
<mac address>
Default Values
By default, no static neighbor entries exist in the neighbor cache.
Command History
Release 18.1
Functional Notes
In IPv6, neighbors are usually managed dynamically using the ND protocol. However, you can manually
enter a static entry into the neighbor cache using the ipv6 neighbor command. When you enter a static
entry into the neighbor cache, you should be aware of the following:
•
A static entry entirely overrides an existing or new dynamic entry learned through ND.
•
Neighbor unreachability detection (NUD) is not performed on static neighbors, so the neighbor's state
is limited to either an incomplete modified state (interface is down) or a reachable modified state
(interface is up).
•
Using the no form of the ipv6 neighbor command removes static entries and not dynamic entries
from the neighbor cache.
•
Using the command
cache, but not the static entries.
•
Disabling IPv6 on an interface does not remove the static neighbor cache entries, although it will
change the entry state to incomplete.
Usage Examples
The following example adds a static neighbor with an IPv6 address of 2001:DB8:3F::/48 on the Ethernet
0/1 interface, and has a MAC address of 00:A0:C8:00:00:01 to the neighbor cache:
(config)#ipv6 neighbor 2001:DB8:3F::/48 ethernet 0/1 00:A0:C8:00:00:01
60000CRG0-35E
Specifies the IPv6 address of the neighbor entry. IPv6 addresses should be
specified in colon hexadecimal format (X:X:X:X::X). For example,
2001:DB8:1::1.
Specifies the interface of the link on which the neighbor entry is connected.
Interfaces are specified using the <interface> <slot/port | interface id>
format. For example, to specify a Point-to-Point Protocol (PPP) interface,
enter ppp 1.
Specifies the medium access control (MAC) address of the neighbor. MAC
addresses should be expressed in the following format:
XX:XX:XX:XX:XX:XX (for example, 00:A0:C8:00:00:01).
Command was introduced.
clear ipv6 neighbors on page 142
Copyright © 2012 ADTRAN, Inc.
Global Configuration Mode Command Set
clears the dynamic entries from the neighbor
1214
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