IPv6 Configuration Guide K/KA/KB.15.15

2 IPv6 Management Features
NOTE: All commands previously in the Summary of commands table are indexed under the entry
Command syntax.
This chapter focuses on the IPv6 application of management features that support both IPv6 and
IPv4 operation. For additional information on these features, see the current Management and
Configuration Guide for your switch.
Viewing the neighbor cache
Neighbor discovery occurs when there is communication between the switch and another, reachable
IPv6 device on the same VLAN. A neighbor destination is reachable from a given source address
if a confirmation (neighbor solicitation) has been received at the source verifying that traffic has
been received at the destination.
The switch maintains an IPv6 neighbor cache that is populated as a result of communication with
other devices on the same VLAN.
You can view the contents of the neighbor cache using the commands described in this section.
For more information, see “View the neighbor cache” (page 52).
Syntax:
show ipv6 neighbors [ vlan vid ]
Displays IPv6 neighbor information currently held in the neighbor cache. After a
period without communication with a given neighbor, the switch drops that
neighbor's data from the cache. The command lists neighbors for all VLAN interfaces
on the switch or for only the specified VLAN. The following fields are included for
each entry in the cache:
IPv6 Address
Lists the 128-bit addresses for the local host and any neighbors (on the same
VLAN) with whom there has been recent communication.
MAC Address
The MAC Address corresponding to each of the listed IPv6 addresses.
VLAN vid
Optional. Causes the switch to list only the IPv6 neighbors on a specific VLAN
configured on the switch.
Type
Appears only when VLAN is not specified and indicates whether the
corresponding address is local (configured on the switch) or dynamic (configured
on a neighbor device).
Age
Appears only when the VLAN is specified and indicates the length of time the
entry has remained unused.
Port
Identifies the switch port on which the entry was learned. If this field is empty
for a given address, the address is configured on the switch itself.
State
A neighbor destination is reachable from a given source address if confirmation
has been received at the source verifying that traffic has been received at the
destination. This field shows the reachability status of each listed address:
36 IPv6 Management Features