Chapter 26
| IP Interface Commands
Neighbor Discovery
– 680 –
show ipv6 neighbors This command displays information in the IPv6 neighbor discovery cache.
Syntax
show ipv6 neighbors [vlan vlan-id | ipv6-address]
vlan-id - VLAN ID (Range: 1-4094)
ipv6-address - The IPv6 address of a neighbor device. You can specify either
a link-local or global unicast address formatted according to RFC 2373 “IPv6
Addressing Architecture,” using 8 colon-separated 16-bit hexadecimal
values. One double colon may be used in the address to indicate the
appropriate number of zeros required to fill the undefined fields.
Default Setting
All IPv6 neighbor discovery cache entries are displayed.
Command Mode
Privileged Exec
Example
The following shows all known IPv6 neighbors for this switch:
Console#show ipv6 neighbors
State: I1 - Incomplete, I2 - Invalid, R - Reachable, S - Stale, D - Delay,
P1 - Probe, P2 - Permanent, U - Unknown
IPv6 Address Age Link-layer Addr State VLAN
FE80::B60E:DCFF:FE39:F44B 25 B4-0E-DC-39-F4-4B R 1
FE80::2E0:CFF:FE9C:CA10 4 00-E0-0C-9C-CA-10 R 1
Console#
Table 144: show ipv6 neighbors - display description
Field Description
IPv6 Address IPv6 address of neighbor
Age The time since the address was verified as reachable (in seconds). A static entry is
indicated by the value “Permanent.”
Link-layer Addr Physical layer MAC address.
State The following states are used for dynamic entries:
I1 (Incomplete) - Address resolution is being carried out on the entry. A neighbor
solicitation message has been sent to the multicast address of the target, but it
has not yet returned a neighbor advertisement message.
I2 (Invalid) - An invalidated mapping. Setting the state to invalid dis-associates the
interface identified with this entry from the indicated mapping (RFC 4293).
R (Reachable) - Positive confirmation was received within the last ReachableTime
interval that the forward path to the neighbor was functioning. While in REACH
state, the device takes no special action when sending packets.
S (Stale) - More than the ReachableTime interval has elapsed since the last
positive confirmation was received that the forward path was functioning. While
in STALE state, the device takes no action until a packet is sent.
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