Chapter 30
| IP Interface Commands
IPv6 Interface
– 955 –
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::2E0:CFF:FE9C:CA10 4 00-E0-0C-9C-CA-10 R 1
Console#
Table 189: 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.
D (Delay) - More than the ReachableTime interval has elapsed since the last
positive confirmation was received that the forward path was functioning. A
packet was sent within the last DELAY_FIRST_PROBE_TIME interval. If no
reachability confirmation is received within this interval after entering the DELAY
state, the switch will send a neighbor solicitation message and change the state
to PROBE.
P1 (Probe) - A reachability confirmation is actively sought by resending neighbor
solicitation messages every RetransTimer interval until confirmation of
reachability is received.
U (Unknown) - Unknown state.
The following states are used for static entries:
I1 (Incomplete)-The interface for this entry is down.
R (Reachable) - The interface for this entry is up. Reachability detection is not
applied to static entries in the IPv6 neighbor discovery cache.
P2 (Permanent) - Indicates a static entry.
VLAN VLAN interface from which the address was reached.
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