Viewing the current IPv6 addressing configuration
Use these commands to view the status of the IPv6 configuration on the switch.
Syntax:
show ipv6
Lists the current, global IPv6 settings, and per-VLAN IPv6 addressing on the switch.
IPv6 Routing
: Global setting and is not configured per-VLAN.
Default Gateway
: Lists the IPv4 default gateway, if any, configured on the switch.It 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.Default: 3; Range: 0–600 ms. A setting of “0” disables duplicate address detection. See
Duplicate Address Detection (DAD).
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. See
Configuring IPv6 addressing.
Address Origin
:
Autoconfig
: The address was configured using stateless address autoconfiguration (SLAAC). In this case, the interface identifier for global unicast addresses copied from the current link-local unicast address.
DHCP
: The address is 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. See
Address lifetimes.
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.
The display below shows the output for a switch having IPv6 enabled on one VLAN.
Switch# show ipv6 Internet (IPv6) Service IPv6 Routing : Enabled Default Gateway : fe80::213:c4ff:fedd:14b0 ND DAD : Enabled DAD Attempts : 3 Vlan Name : DEFAULT_VLAN IPv6 Status : Disabled Vlan Name : VLAN10 IPv6 Status : Enabled Address | Address Origin | IPv6 Address/Prefix Length Status –––––––––– + –––––––––––––––––––––––––––––––––– ––––––––– dhcp | 2001:db8:a03:e102::1:101/64 preferred manual | fe80::1:101/64 preferred
The display below shows the output for a switch having IPv6 enabled on one VLAN.
Switch(config)# show ipv6 Internet (IPv6) Service IPv6 Routing : Disabled Default Gateway : 10.0.9.80 ND DAD : Enabled DAD Attempts : 3 Vlan Name : DEFAULT_VLAN IPv6 Status : Disabled Vlan Name : VLAN10 IPv6 Status : Enabled Address | Address Origin | IPv6 Address/Prefix Length Status –––––––––– + –––––––––––––––––––––––––––---–––––-–– ––––––––– autoconfig | 2930:0:a03:e102::127/64 preferred dhcp | 2930:0:a03:e102:212:79ff:fe88:a100/64 preferred manual | fe80::127/64 preferred
Syntax:
show ipv6 nd
Displays the current IPv6 ND settings on the configured VLAN interfaces.
Switch# show ipv6 nd IPV6 Neighbor Discovery Configuration VLAN ID DAD RCH Time NS Interval Attempts (msecs) (msecs) ––––––––– ––––––––– –––––––––– ––––––––––– 1 3 30000 1000 22 3 30000 1000
Syntax:
show ipv6 vlan
<vid>
Displays IPv6 addresses and IPv6 global configuration settings, the IPv6 status for the specified VLAN, the IPv6 addresses (with prefix lengths) configured on the specified VLAN, and the expiration data (Expiry) for each address.
ipv6 routing
This setting is always
Disabled
. (See Router access and default router selection.)default gateway
Lists the IPv4 default gateway, if any, configured on the switch.It is a globally configured router gateway address and is not configured per-VLAN
nd dad
Shows whether ND is enabled. The default setting is Enabled. 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. A setting of “0” disables duplicate address detection. See Duplicate Address Detection (DAD).
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. See Configuring IPv6 addressing.
IPv6 Address/Prefix Length
Lists each IPv6 address and prefix length configured on the indicated VLAN.
Expiry
Lists the lifetime status of each IPv6 address listed for a VLAN:Permanent
The address will not time out and need renewal or replacement.
date/time
The date and time that the address expires. Expiration date and time are specified in the RA used to create the prefix for automatically configured, global unicast addresses. The Address Status field in the
show ipv6
command output indicates whether this date/time is for the “preferred” or “valid” lifetime assigned to the corresponding address.
Switch(config)# show ipv6 vlan 10 Internet (IPv6) Service IPv6 Routing : Disabled Default Gateway : fe80::213:c4ff:fedd:14b0%vlan10 ND DAD : Enabled DAD Attempts : 3 Vlan Name : VLAN10 IPv6 Status : Enabled IPv6 Address/Prefixlength Expiry ––––––––––––––––––––––––––––––––– –––––––––––––––––––––––– 2001:db8:a03:e102::1:101/64 Fri May 19 11:51:15 2014 fe80::1:101/64 permanent
Syntax:
show run
ipv6 enable
ipv6 address fe80::<interface-id> link-local
ipv6 address <prefix>:<interface-id>/<prefix-length>
ipv6 address autoconfig
ipv6 address dhcp full [rapid–commit]
ipv6 <global–unicast–address>/<prefix>
Switch(config)# show run Running configuration: . . . vlan 10 name "VLAN10" untagged 1–12 ipv6 address fe80::1:101 link-local ipv6 address dhcp full rapid–commit . . .
Statically configured IPv6 addresses appear in the
show run
output.
Commands for automatic IPv6 address configuration appear in the
show run
output, but the addresses resulting from these commands do not appear in the output.