Which command display information about ipv6 protocol configuration?

brief: Displays brief IPv6 interface information, including physical status, link-layer protocols, and IPv6 address. If you do not specify the keyword, this command displays detailed IPv6 interface information, including IPv6 configuration and operating information, and IPv6 packet statistics.

Usage guidelines

If you do not specify an interface, this command displays IPv6 information about all interfaces.

If you specify only the interface-type argument, this command displays IPv6 information about the interfaces of the specified type.

If you specify both the interface-type and the interface-number arguments, this command displays IPv6 information about the specified interface.

Examples

# Display IPv6 information about VLAN-interface 2.

 display ipv6 interface vlan-interface 2
Vlan-interface2 current state: UP
Line protocol current state: UP
IPv6 is enabled, link-local address is FE80::1234:56FF:FE65:4322 [TENTATIVE]
  Global unicast address(es):
    10::1234:56FF:FE65:4322, subnet is 10::/64 [TENTATIVE] [AUTOCFG]
      [valid lifetime 4641s/preferred lifetime 4637s]
    20::1234:56ff:fe65:4322, subnet is 20::/64 [TENTATIVE] [EUI-64]
    30::1, subnet is 30::/64 [TENTATIVE] [ANYCAST]
    40::2, subnet is 40::/64 [TENTATIVE] [DHCP]
    50::3, subnet is 50::/64 [TENTATIVE]
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FF00:1
    FF02::1:FF65:4322
  MTU is 1500 bytes
  ND DAD is enabled, number of DAD attempts: 1
  ND reachable time is 30000 milliseconds
  ND retransmit interval is 1000 milliseconds
  Hosts use stateless autoconfig for addresses
IPv6 Packet statistics:
  InReceives:                     0
  InTooShorts:                    0
  InTruncatedPkts:               0
  InHopLimitExceeds:             0
  InBadHeaders:                   0
  InBadOptions:                   0
  ReasmReqds:                     0
  ReasmOKs:                       0
  InFragDrops:                    0
  InFragTimeouts:                0
  OutFragFails:                   0
  InUnknownProtos:               0
  InDelivers:                     0
  OutRequests:                    0
  OutForwDatagrams:              0
  InNoRoutes:                     0
  InTooBigErrors:                0
  OutFragOKs:                     0
  OutFragCreates:                0
  InMcastPkts:                   0
  InMcastNotMembers:            0
  OutMcastPkts:                  0
  InAddrErrors:                  0
  InDiscards:                    0
  OutDiscards:                   0

Field

Description

Vlan-interface2 current state

Physical state of the interface:

• Administratively DOWN—The interface has been administratively shut down by using the shutdown command.

• DOWN—The interface is administratively up but its physical state is down, possibly because of a connection or link failure.

• UP—The administrative and physical states of the interface are both up.

Line protocol current state

Link layer state of the interface:

• DOWN—The link layer protocol state of the interface is down.

• UP—The link layer protocol state of the interface is up.

IPv6 is enabled

IPv6 is enabled on the interface. This feature is automatically enabled after an IPv6 address is configured for an interface.

link-local address

Link-local address of the interface.

Global unicast address(es)

Global unicast addresses of the interface.

IPv6 address states:

• TENTATIVE—Initial state. DAD is being performed or is to be performed on the address.

• DUPLICATE—The address is not unique on the link.

• PREFERRED—The address is preferred and can be used as the source or destination address of a packet. If an address is in this state, the command does not display the address state.

• DEPRECATED—The address is beyond the preferred lifetime but in the valid lifetime. It is valid, but it cannot be used as the source address for a new connection. Packets destined for the address are processed correctly.

If a global unicast address is not manually configured, the following notations indicate how the address is obtained:

• AUTOCFG—Stateless autoconfigured.

• DHCP—Assigned by a DHCPv6 server.

• EUI-64—Manually configured EUI-64 IPv6 address.

• RANDOM—Random address automatically generated.

If the address is a manually configured anycast address, it is noted with ANYCAST.

valid lifetime

Specifies how long autoconfigured global unicast addresses using a prefix are valid.

preferred lifetime

Specifies how long autoconfigured global unicast addresses using a prefix are preferred.

Joined group address(es)

Addresses of the multicast groups that the interface has joined.

MTU

MTU of the interface.

ND DAD is enabled, number of DAD attempts

DAD is enabled.

• If DAD is enabled, this field displays the number of attempts to send an NS message for DAD (set by using the ipv6 nd dad attempts command).

• If DAD is disabled, this field displays ND DAD is disabled. To disable DAD, set the number of attempts to 0.

ND reachable time

Time during which a neighboring device is reachable.

ND retransmit interval

Interval for retransmitting an NS message.

Hosts use stateless autoconfig for addresses

Hosts obtained IPv6 addresses through stateless autoconfiguration.

InReceives

Received IPv6 packets, including error messages.

InTooShorts

Received IPv6 packets that are too short. For example, the received IPv6 packet is less than 40 bytes.

InTruncatedPkts

Received IPv6 packets with a length less than the payload length field specified in the packet header.

InHopLimitExceeds

Received IPv6 packets with a hop count exceeding the hop limit field specified in the packet header.

InBadHeaders

Received IPv6 packets with incorrect basic headers.

InBadOptions

Received IPv6 packets with incorrect extension headers.

ReasmReqds

Received IPv6 fragments.

ReasmOKs

Number of reassembled IPv6 packets.

InFragDrops

Received IPv6 fragments that are discarded because of certain errors.

InFragTimeouts

Received IPv6 fragments that are discarded because the amount of time they stay in the system buffer exceeds the specified interval.

OutFragFails

IPv6 packets that fail to be fragmented on the output interface.

InUnknownProtos

Received IPv6 packets with unknown or unsupported protocol type.

InDelivers

Received IPv6 packets that are delivered to user protocols (such as ICMPv6, TCP, and UDP).

OutRequests

Local IPv6 packets sent by IPv6 user protocols.

OutForwDatagrams

IPv6 packets forwarded by the interface.

InNoRoutes

Received IPv6 packets that are discarded because no matching route can be found.

InTooBigErrors

Received IPv6 packets that fail to be forwarded because they exceeded the Path MTU.

OutFragOKs

Fragmented IPv6 packets on the output interface.

OutFragCreates

Number of IPv6 fragments on the output interface.

InMcastPkts

Received IPv6 multicast packets.

InMcastNotMembers

Received IPv6 multicast packets that are discarded because the interface is not in the multicast group.

OutMcastPkts

IPv6 multicast packets sent by the interface.

InAddrErrors

Received IPv6 packets that are discarded due to invalid destination addresses.

InDiscards

Received IPv6 packets that are discarded due to resource problems rather than packet errors.

OutDiscards

IPv6 packets that fail to be sent due to resource problems rather than packet errors.

# Display brief IPv6 information about all interfaces.

 display ipv6 interface brief
*down: administratively down
(s): spoofing
Interface                                 Physical Protocol IPv6 Address 
Vlan-interface1                          down    down      Unassigned
Vlan-interface2                          up         up     2001::1
Vlan-interface100                        up         up        Unassigned

Field

Description

*down: administratively down

The interface has been administratively shut down by using the shutdown command.

(s): spoofing

Spoofing attribute of the interface. The link protocol state of the interface is up, but the link is temporarily established on demand or does not exist.

Interface

Name of the interface.

Physical

Physical state of the interface:

• *down—The interface has been administratively shut down by using the shutdown command.

• down—The interface is administratively up but its physical state is down, possibly because of a connection or link failure.

  Which command is used to configure IPv6?

  The list of CLI commands for the configuration of IPv6 is as follows: ipv6 enable. ipv6 unicast-routing. ipv6 address - prefix prefix-len.

  Which command displays IPv6 router information?

  To display the IPv6 route table, use the show ipv6 route command. The ipv6-address parameter restricts the display to the entries for the specified IPv6 address. You must specify the ipv6-address parameter in hexadecimal using 16-bit values between colons as documented in RFC 2373.

  Which Cisco IOS command is used to display all the sources of IPv6 routing information on a device?

  To display the contents of all current IPv6 access lists, use the show ipv6 access-listcommand in user EXEC or privileged EXEC mode.

  How to check IPv6 address in cmd?

  Type “ipconfig/all” on the blinking cursor then press [Enter]. NOTE: You will find the IPv6 Address network details under the Ethernet adapter Local Area Connection section.