Commands to view the current IPv6 addressing configuration
Use these commands to view the status of the IPv6 configuration on the switch.
show ipv6
-
Lists the current global IPv6 settings and per-VLAN IPv6 addressing on the switch.
IPv6 Routing
-
For software releases K.13.01 through K.14.01, this setting is always
Disabled
. This is a global setting and is not configured per-VLAN. Default Gateway
-
Lists the IPv4 default gateway, if any, configured on the switch. This is a globally configured router gateway address and is not configured per-VLAN.
ND DAD
-
Indicates whether DAD is enabled (the default) or disabled. Using
ipv6 nd dad-attempts 0
disables ND. DAD Attempts
-
Indicates the number of neighbor solicitations the switch transmits per-address for duplicate (IPv6) address detection. Implemented when a new address is configured or when an interface with configured addresses (such as after a reboot). Default: 3; Range: 0 – 255 ms. 0 disables duplicate address detection.
VLAN Name
-
Lists the name of a VLAN statically configured on the switch.
IPv6 Status
-
For the indicated VLAN, shows whether IPv6 is disabled (the default) or enabled.
Address Origin
-
Autoconfig
-
The address was configured using SLAAC. In this case, the interface identifier for global unicast addresses copied from the current link-local unicast address.
DHCP
-
The address was assigned by a DHCPv6 server. Addresses having a DHCP origin are listed with a 128-bit prefix length.
Manual
-
The address was statically configured on the VLAN.
IPv6 Address/Prefix Length
-
Lists each IPv6 address and prefix length configured on the indicated VLAN.
Address Status
-
Tentative
-
DAD has not yet confirmed the address as unique, and it is not usable for sending and receiving traffic.
Preferred
-
The address has been confirmed as unique by DAD and usable for sending and receiving traffic. The Expiry time shown for this address by the
show ipv6 vlan
vid command output is the preferred lifetime assigned to the address. Deprecated
-
The preferred lifetime for the address has been exceeded, but there is time remaining in the valid lifetime.
Duplicate
-
Indicates a statically configured IPv6 address that is a duplicate of another IPv6 address that exists on another device belonging to the same VLAN interface. A duplicate address is not used.
Example output
This example shows the output on a switch having IPv6 enabled on one VLAN.
Switch# show ipv6 Internet (IPv6) Service IPv6 Routing : Enabled ND DAD : Enabled DAD Attempts : 3 VLAN Interfaces Interface Name : DEFAULT_VLAN IPv6 Status : Disabled Layer 3 Status : Enabled Interface Name : VLAN22 IPv6 Status : Enabled Layer 3 Status : Enabled Address | Address Origin | IPv6 Address/Prefix Length Status ---------- + ---------------------------------- --------- autoconfig | fe80::218:71ff:feb9:8500/64 tentative Tunnel Interfaces Interface Name : TUNNEL3 IPv6 Status : Enabled Layer 3 Status : NA Address | Address Origin | IPv6 Address/Prefix Length Status ---------- + --------------------------------—- --------- autoconfig | fe80::218:71ff:feb9:8500/64 tentative