Use this command to show the usability status of IPv6 interfaces and whether ICMPv6 Destination Unreachable messages may be sent. The argument unit/slot/port corresponds to a physical routing interface or VLAN routing interface. The keyword vlan is used to specify the VLAN ID of the routing VLAN directly instead of a unit/slot/port format. The keyword loopback specifies the loopback interface directly. The keyword tunnel specifies the IPv6 tunnel interface.
| Format | show ipv6 interface {brief | unit/slot/port|vlan 1-4093|loopback 0-7|tunnel 0-7} |
| Mode | Privileged EXEC |
If you use the brief parameter, the following information displays for all configured IPv6 interfaces:
| Term | Definition |
|---|---|
| Interface | The interface in unit/slot/port format. |
| IPv6 Operational Mode | Shows whether the mode is enabled or disabled. |
| IPv6 Address/Length | Shows the IPv6 address and length on interfaces with IPv6 enabled. |
| Method | Indicates how each IP address was assigned. The field contains one of the following values:
|
If you specify an interface, the following information also appears.
| Term | Definition |
|---|---|
| Routing Mode | Shows whether IPv6 routing is enabled or disabled. |
| IPv6 Enable Mode | Shows whether IPv6 is enabled on the interface. |
| Administrative Mode | Shows whether the interface administrative mode is enabled or disabled. |
| Bandwidth | Shows bandwidth of the interface. |
| Interface Maximum Transmission Unit | The MTU size, in bytes. |
| Router Duplicate Address Detection Transmits | The number of consecutive duplicate address detection probes to transmit. |
| Address Autoconfigure Mode | Shows whether the autoconfigure mode is enabled or disabled. |
| Address DHCP Mode | Shows whether the DHCPv6 client is enabled on the interface. |
| IPv6 Hop Limit Unspecified | Indicates if the router is configured on this interface to send Router Advertisements with unspecified (0) as the Current Hop Limit value. |
| Router Advertisement NS Interval | The interval, in milliseconds, between router advertisements for advertised neighbor solicitations. |
| Router Advertisement Lifetime | Shows the router lifetime value of the interface in router advertisements. |
| Router Advertisement Reachable Time | The amount of time, in milliseconds, to consider a neighbor reachable after neighbor discovery confirmation. |
| Router Advertisement Interval | The frequency, in seconds, that router advertisements are sent. |
| Router Advertisement Managed Config Flag | Shows whether the managed configuration flag is set (enabled) for router advertisements on this interface. |
| Router Advertisement Other Config Flag | Shows whether the other configuration flag is set (enabled) for router advertisements on this interface. |
| Router Advertisement Router Preference | Shows the router preference. |
| Router Advertisement Suppress Flag | Shows whether router advertisements are suppressed (enabled) or sent (disabled). |
| IPv6 Destination Unreachables | Shows whether ICMPv6 Destination Unreachable messages may be sent (enabled) or not disabled). For more information, see ipv6 unreachables. |
| ICMPv6 Redirect | Specifies if ICMPv6 redirect messages are sent back to the sender by the Router in the redirect scenario is enabled on this interface. |
If an IPv6 prefix is configured on the interface, the following information also appears.
| Term | Definition |
|---|---|
| IPv6 Prefix is | The IPv6 prefix for the specified interface. |
| Preferred Lifetime | The amount of time the advertised prefix is a preferred prefix. |
| Valid Lifetime | The amount of time the advertised prefix is valid. |
| Onlink Flag | Shows whether the onlink flag is set (enabled) in the prefix. |
| Autonomous Flag | Shows whether the autonomous address-configuration flag (autoconfig) is set (enabled) in the prefix. |
Example: The following shows example CLI display output for the command.
(alpha-stack) #show ipv6 interface brief
Oper.
Interface Mode IPv6 Address/Length
---------- -------- ---------------------------------
1/0/33 Enabled FE80::211:88FF:FE2A:3E3C/128
2033::211:88FF:FE2A:3E3C/64
2/0/17 Enabled FE80::211:88FF:FE2A:3E3C/128
2017::A42A:26DB:1049:43DD/128 [DHCP]
0/4/1 Enabled FE80::211:88FF:FE2A:3E3C/128
2001::211:88FF:FE2A:3E3C/64 [AUTO]
0/4/2 Disabled FE80::211:88FF:FE2A:3E3C/128 [TENT]
Example: The following shows example CLI display output for the command.
(Switch) #show ipv6 interface 0/4/1
IPv6 is enabled
IPv6 Prefix is ................................ fe80::210:18ff:fe00:1105/128
2001::1/64
Routing Mode................................... Enabled
IPv6 Enable Mode............................... Enabled
Administrative Mode............................ Enabled
IPv6 Operational Mode.......................... Enabled
Bandwidth...................................... 10000 kbps
Interface Maximum Transmit Unit................ 1500
Router Duplicate Address Detection Transmits... 1
Address DHCP Mode.............................. Disabled
IPv6 Hop Limit Unspecified..................... Enabled
Router Advertisement NS Interval............... 0
Router Advertisement Lifetime.................. 1800
Router Advertisement Reachable Time............ 0
Router Advertisement Interval.................. 600
Router Advertisement Managed Config Flag....... Disabled
Router Advertisement Other Config Flag......... Disabled
Router Advertisement Router Preference......... medium
Router Advertisement Suppress Flag............. Disabled
IPv6 Destination Unreachables.................. Enabled
ICMPv6 Redirects............................... Enabled
Prefix 2001::1/64
Preferred Lifetime............................. 604800
Valid Lifetime................................. 2592000
Onlink Flag.................................... Enabled
Autonomous Flag................................ Enabled
