vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, this command displays IPv6 FIB entries for the public network.

ipv6-address: Displays IPv6 FIB entries for a destination IPv6 address. If you do not specify an IPv6 address, this command displays all IPv6 FIB entries.

prefix-length: Specifies a prefix length for the IPv6 address, in the range of 0 to 128. If you do not specify the prefix length, this command displays the IPv6 FIB entry longest matching the IPv6 address.

Examples

# Display all IPv6 FIB entries for the public network.

<Sysname> display ipv6 fib

Destination count: 1 FIB entry count: 1

Flag:

U:Useable G:Gateway H:Host B:Blackhole D:Dynamic S:Static

R:Relay F:FRR

Destination: ::1 Prefix length: 128

Nexthop : ::1 Flags: UH

Time stamp : 0x1 Label: Null

Interface : InLoop0 Token: Invalid

Table 1 Command output

Field	Description
Destination count	Total number of destination addresses.
FIB entry count	Total number of IPv6 FIB entries.
Destination	Destination address.
Prefix length	Prefix length of the destination address.
Nexthop	Next hop address.
Flags	Route flag: · U—Usable route. · G—Gateway route. · H—Host route. · B—Black hole route. · D—Dynamic route. · S—Static route. · R—Recursive route. · F—Fast re-route.
Time stamp	Time when the IPv6 FIB entry was generated.
Label	Inner MPLS label.
Interface	Outgoing interface.
Token	Label switched path index number.

display ipv6 icmp statistics

Use display ipv6 icmp statistics to display ICMPv6 packet statistics.

Syntax

In standalone mode:

display ipv6 icmp statistics [ slot slot-number ]

In IRF mode:

display ipv6 icmp statistics [ chassis chassis-number slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays ICMPv6 packet statistics for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command displays ICMPv6 packet statistics for all cards if you do not specify a card. On an IRF 3 system, this command displays ICMPv6 packet statistics for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

Examples

# Display ICMPv6 packet statistics.

<Sysname> display ipv6 icmp statistics

Input: bad code 0 too short 0

checksum error 0 bad length 0

path MTU changed 0 destination unreachable 0

too big 0 parameter problem 0

echo request 0 echo reply 0

neighbor solicit 0 neighbor advertisement 0

router solicit 0 router advertisement 0

redirect 0 router renumbering 0

output: parameter problem 0 echo request 0

echo reply 0 unreachable no route 0

unreachable admin 0 unreachable beyond scope 0

unreachable address 0 unreachable no port 0

too big 0 time exceed transit 0

time exceed reassembly 0 redirect 0

ratelimited 0 other errors 0

display ipv6 interface

Use display ipv6 interface to display IPv6 interface information.

Syntax

display ipv6 interface [ interface-type [ interface-number ] ] [ brief ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

interface-type: Specifies an interface by its type.

interface-number: Specifies an interface by its number.

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.

<Sysname> 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

Table 2 Command output

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.

<Sysname> 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

Table 3 Command output

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. · up—The administrative and physical states of the interface are both up.
Protocol	Link layer protocol state of the interface: · down—The network layer protocol state of the interface is down. · up—The network layer protocol state of the interface is up.
IPv6 Address	IPv6 address of the interface. · If multiple global unicast addresses are configured, this field displays the lowest address. · If no global unicast address is configured, this field displays the link-local address. · If no address is configured, this field displays Unassigned.

display ipv6 interface prefix

Use display ipv6 interface prefix to display IPv6 prefix information for an interface.

Syntax

display ipv6 interface interface-type interface-number prefix

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

interface-type interface-number: Specifies an interface by its type and number.

Examples

# Display IPv6 prefix information for VLAN-interface 10.

<Sysname> display ipv6 interface vlan-interface10 prefix

Prefix: 1001::/65 Origin: ADDRESS

Age: - Flag: AL

Lifetime(Valid/Preferred): 2592000/604800

Prefix: 2001::/64 Origin: STATIC

Age: - Flag: L

Lifetime(Valid/Preferred): 3000/2000

Prefix: 3001::/64 Origin: RA

Age: 600 Flag: A

Lifetime(Valid/Preferred): -

Table 4 Command output

Filed	Description
Prefix	IPv6 address prefix.
Origin	How the prefix is generated: · STATIC—Manually configured by using the ipv6 nd ra prefix command. · RA—Advertised in RA messages after stateless autoconfiguration is enabled. · ADDRESS—Generated by a manually configured address.
Age	Aging time in seconds. If the prefix does not age out, this field displays a hyphen (-).
Flag	Flags carried in RA messages. If no flags are available, this field displays a hyphen (-). · L—The address with the prefix is directly reachable on the link. · A—The prefix is used for stateless autoconfiguration. · N—The prefix is not advertised in RA messages.
Lifetime	Lifetime in seconds advertised in RA messages. If the prefix does not need to be advertised, this field displays a hyphen (-). · Valid—Valid lifetime of the prefix. · Preferred—Preferred lifetime of the prefix.

Related commands

ipv6 nd ra prefix

display ipv6 nd snooping

Use display ipv6 nd snooping to display IPv6 ND snooping entries.

Syntax

display ipv6 nd snooping [ [ [ vlan vlan-id | interface interface-type interface-number ] [ global | link-local ] ] | ipv6-address ] [ verbose ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

vlan vlan-id: Displays ND snooping entries for the specified VLAN. The value range for the VLAN ID is 1 to 4094.

interface interface-type interface-number: Displays ND snooping entries for the specified interface. The interface-type interface-number argument specifies an interface by its type and number.

ipv6-address: Displays the ND snooping entry for the specified IPv6 address.

global: Displays ND snooping entries for global unicast addresses.

link-local: Displays ND snooping entries for link-local addresses.

verbose: Displays detailed information about ND snooping entries. If you do not specify the keyword, this command displays brief information about ND snooping entries.

Examples

# Display IPv6 ND snooping entries for VLAN 1.

<Sysname> display ipv6 nd snooping vlan 1

IPv6 address MAC address VID Interface Status Age

1::2 0000-1234-0c01 1 XGE1/0/2 VALID 57

# Display detailed information about IPv6 ND snooping entries for VLAN 1.

<Sysname> display ipv6 nd snooping vlan 1 verbose

IPv6 address: 1::2

MAC address: 0000-1234-0c01

Interface: XGE1/0/2

First VLAN ID: 1 Second VLAN ID: N/A

Status: VALID Age: 57

Table 5 Command output

Filed	Description
IPv6 address	IPv6 address in the ND snooping entry.
MAC address	MAC address in the ND snooping entry.
VID	ID of the VLAN to which the ND snooping entry belongs.
First VLAN ID	ID of the SVLAN to which the ND snooping entry belongs.
Second VLAN ID	ID of the CVLAN to which the ND snooping entry belongs. If no CVLAN is configured, this field displays N/A. For more information about the SVLAN and CVLAN, see Layer 2–LAN Switching Configuration Guide.
Interface	Input interface in the ND snooping entry.
Status	Status of the ND snooping entry: · TENTATIVE—The entry is ineffective. · VALID—The entry is effective. · TESTING TPLT—The entry is being tested by DAD. The device performs DAD for the entry in the following situations: ¡ The entry ages out ¡ An ND trusted interface in the VLAN receives an ND message from the IPv6 address in the entry. · TESTING VP—The entry is being tested by DAD. The device performs DAD when an ND untrusted interface in the VLAN receives an ND message from the IPv6 address in the entry.
Age	ND snooping entry aging time in seconds.

display ipv6 nd snooping count

Use display ipv6 nd snooping count to display the number of IPv6 ND snooping entries.

Syntax

display ipv6 nd snooping count [ interface interface-type interface-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

interface interface-type interface-number: Specifies an interface by its type and number. If you do not specify an interface, this command displays the total number of ND snooping entries.

Examples

# Display the total number of IPv6 ND snooping entries.

<Sysname> display ipv6 nd snooping count

Total number of entries: 5

# Display the total number of IPv6 ND snooping entries on Ten-GigabitEthernet 1/0/1.

<Sysname> display ipv6 nd snooping count interface ten-gigabitethernet 1/0/1

Total number of entries on interface: 2

display ipv6 neighbors

Use display ipv6 neighbors to display IPv6 neighbor information.

Syntax

In standalone mode:

display ipv6 neighbors { { ipv6-address | all | dynamic | static } [ slot slot-number ] | interface interface-type interface-number | vlan vlan-id } [ verbose ]

In IRF mode:

display ipv6 neighbors { { ipv6-address | all | dynamic | static } [ chassis chassis-number slot slot-number ] | interface interface-type interface-number | vlan vlan-id } [ verbose ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

ipv6-address: Specifies the IPv6 address of a neighbor whose information is displayed.

all: Displays information about all neighbors, including neighbors acquired dynamically and configured statically on the public network and all private networks.

dynamic: Displays information about all neighbors acquired dynamically.

static: Displays information about all neighbors configured statically.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays IPv6 neighbor information for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command displays IPv6 neighbor information for all cards if you do not specify a card. On an IRF 3 system, this command displays IPv6 neighbor information for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

interface interface-type interface-number: Specifies an interface by its type and number.

vlan vlan-id: Displays information about neighbors in the specified VLAN. The value range for VLAN ID is 1 to 4094.

verbose: Displays detailed neighbor information.

Examples

# Display all neighbor information.

<Sysname> display ipv6 neighbors all

Type: S-Static D-Dynamic O-Openflow R-Rule I-Invalid

IPv6 address Link layer VID Interface/Link ID State T Age

1::2 6864-6839-0202 1 XGE1/0/1 STALE D 136

FE80::6A64:68FF:FE39:202 6864-6839-0202 1 XGE1/0/1 STALE D 126

# Display detailed information about all neighbors.

<Sysname> display ipv6 neighbors all verbose

Type: S-Static D-Dynamic O-Openflow R-Rule I-Invalid

IPv6 Address: 1::2

Link Layer : 6864-6839-0202 VID : 1 Interface: XGE1/0/1

State : STALE Type: D Age : 290

Vpn-instance: [No Vrf]

NickName : 0x0

IPv6 Address: FE80::6A64:68FF:FE39:202

Link Layer : 6864-6839-0202 VID : 1 Interface: XGE1/0/1

State : STALE Type: D Age : 280

Vpn-instance: [No Vrf]

NickName : 0x0

Table 6 Command output

Field	Description
IPv6 Address	IPv6 address of a neighbor.
Link Layer	Link layer address (MAC address) of a neighbor.
VID	VLAN or virtual switch instance (VSI) to which the interface connected to a neighbor belongs. This field displays N/A if the VLAN ID or VSI index is invalid.
Interface/Link ID	Interface or link connected to a neighbor. · If the neighbor entry does not belong to a VSI, this field displays the interface name. If the interface name is not available, the field displays N/A. · If the neighbor entry belongs to a VSI and the interface is a tunnel interface, this field displays the following: ¡ This field displays the VSI if the address is not resolved. ¡ This field displays the tunnel ID if the address is resolved. · If the neighbor entry belongs to a VSI but the interface is not a tunnel interface, this field displays the following: ¡ This field displays the VSI if the address is not resolved. ¡ This field displays the link ID if the address is resolved. The link ID is a string with a maximum of eight hexadecimal numbers.
State	State of a neighbor: · INCMP—The address is being resolved. The link layer address of the neighbor is unknown. · REACH—The neighbor is reachable. · STALE—Whether the neighbor is reachable is unknown. The device does not verify the reachability any longer unless data is sent to the neighbor. · DELAY—Whether the neighbor is reachable is unknown. The device sends an NS message after a delay. · PROBE—Whether the neighbor is reachable is unknown. The device sends an NS message to verify the reachability of the neighbor.
Type	Neighbor information type: · S—Statically configured. · D—Dynamically obtained. · O—Learned from the OpenFlow module. · R—Learned from the Portal module. · I—Invalid.
Age	A hyphen (-) indicates a static entry. For a dynamic entry, this field displays the elapsed time in seconds. If the neighbor is never reachable, this field displays a pound sign (#).
Vpn-instance	Name of a VPN or [No Vrf] with no VPN configured.
NickName	Nickname of a neighbor entry. The name is a string of four hexadecimal numbers. For more information about Nickname, see TRILL Configuration Guide.

Related commands

ipv6 neighbor

reset ipv6 neighbors

display ipv6 neighbors count

Use display ipv6 neighbors count to display the number of neighbor entries.

Syntax

In standalone mode:

display ipv6 neighbors { { all | dynamic | static } [ slot slot-number ] | interface interface-type interface-number | vlan vlan-id } count

In IRF mode:

display ipv6 neighbors { { all | dynamic | static } [ chassis chassis-number slot slot-number ] | interface interface-type interface-number | vlan vlan-id } count

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

all: Displays the total number of all neighbor entries, including neighbor entries created dynamically and configured statically.

dynamic: Displays the total number of neighbor entries created dynamically.

static: Displays the total number of neighbor entries configured statically.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays the number of neighbor entries for all cards. (In standalone mode.) .

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command displays the number of neighbor entries for all cards if you do not specify a card. On an IRF 3 system, this command displays the number of neighbor entries for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

interface interface-type interface-number: Specifies an interface by its type and number.

vlan vlan-id: Displays the total number of neighbor entries in the specified VLAN. The value range for VLAN ID is 1 to 4094.

Examples

# Display the total number of neighbor entries created dynamically.

<Sysname> display ipv6 neighbors dynamic count

Total number of dynamic entries: 2

display ipv6 neighbors entry-limit

Use display ipv6 neighbors entry-limit to display the maximum number of ND entries that a device supports.

Syntax

display ipv6 neighbors entry-limit

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Examples

# Display the maximum number of ND entries that the device supports.

<Sysname> display ipv6 neighbors entry-limit

ND entries: 2048

display ipv6 neighbors vpn-instance

Use display ipv6 neighbors vpn-instance to display neighbor information about a VPN instance.

Syntax

display ipv6 neighbors vpn-instance vpn-instance-name [ count ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. The VPN instance must already exist.

count: Displays the total number of neighbor entries in the specified VPN instance.

Examples

# Display neighbor information about the VPN instance vpn1.

<Sysname> display ipv6 neighbors vpn-instance vpn1

Type: S-Static D-Dynamic O-Openflow R-Rule I-Invalid

IPv6 address Link Layer VID Interface State T Age

FE80::200:5EFF:FE32:B800 0000-5e32-b800 N/A XGE1/0/1 REACH IS -

Table 7 Command output

Field	Description
IPv6 address	IPv6 address of a neighbor.
Link-layer	Link layer address (MAC address) of a neighbor.
VID	VLAN to which the interface connected to a neighbor belongs.
Interface	Interface connected to a neighbor.
State	Neighbor state: · INCMP—The address is being resolved. The link layer address of the neighbor is unknown. · REACH—The neighbor is reachable. · STALE—Whether the neighbor is reachable is unknown. The device does not verify the reachability any longer unless data is sent to the neighbor. · DELAY—Whether the neighbor is reachable is unknown. The device sends an NS message after a delay. · PROBE—Whether the neighbor is reachable is unknown. The device sends an NS message to verify the reachability of the neighbor.
T	Neighbor information type: · S—Statically configured. · D—Dynamically obtained. · O—Learned from the OpenFlow module. · I—Invalid.
Age	A hyphen (-) indicates a static entry. For a dynamic entry, this field displays the elapsed time in seconds. If the neighbor is never reachable, this field displays a pound sign (#).

display ipv6 pathmtu

Use the display ipv6 pathmtu command to display IPv6 Path MTU information.

Syntax

display ipv6 pathmtu [ vpn-instance vpn-instance-name ] { ipv6-address | { all | dynamic | static } [ count ] }

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

ipv6-address: Specifies the destination IPv6 address for which the Path MTU information is to be displayed.

all: Displays all Path MTU information for the public network.

dynamic: Displays all dynamic Path MTU information.

static: Displays all static Path MTU information.

count: Displays the total number of Path MTU entries.

Examples

# Display all Path MTU information.

<Sysname> display ipv6 pathmtu all

IPv6 destination address PathMTU Age Type

1:2::3:2 1800 - Static

1:2::4:2 1400 10 Dynamic

1:2::5:2 1280 10 Dynamic

# Displays the total number of Path MTU entries.

<Sysname> display ipv6 pathmtu all count

Total number of entries: 3

Table 8 Command output

Field	Description
PathMTU	Path MTU value on the network path to an IPv6 address.
Age	Time for a Path MTU to live. For a static Path MTU, this field displays a hyphen (-).
Type	Path MTU type: · Dynamic—Dynamically negotiated. · Static—Statically configured.
Total number of entries	Total number of Path MTU entries.

Related commands

ipv6 pathmtu

reset ipv6 pathmtu

display ipv6 prefix

Use display ipv6 prefix to display information about IPv6 prefixes, including dynamic and static prefixes.

Syntax

display ipv6 prefix [ prefix-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

prefix-number: Specifies the ID of an IPv6 prefix, in the range of 1 to 1024. If you do not specify an IPv6 prefix ID, this command displays information about all IPv6 prefixes.

Usage guidelines

A static IPv6 prefix is configured by using the ipv6 prefix command.

A dynamic IPv6 prefix is obtained from the DHCPv6 server, and its prefix ID is configured by using the ipv6 dhcp client pd command. For detailed information, see Layer 3–IP Services Configuration Guide.

Examples

# Display information about all IPv6 prefixes.

<Sysname> display ipv6 prefix

Number Prefix Type

1 1::/16 Static

2 11:77::/32 Dynamic

# Display information about the IPv6 prefix with prefix ID 1.

<Sysname> display ipv6 prefix 1

Number: 1

Type : Dynamic

Prefix: ABCD:77D8::/32

Preferred lifetime 90 sec, valid lifetime 120 sec

Table 9 Command output

Field	Description
Number	Prefix ID.
Type	Prefix type: · Static—Static IPv6 prefix. · Dynamic—Dynamic IPv6 prefix.
Prefix	Prefix and its length. If no prefix is obtained, this field displays Not-available.
Preferred lifetime 90 sec	Preferred lifetime in seconds. For a static IPv6 prefix, this field is not displayed.
valid lifetime 120 sec	Valid lifetime in seconds. For a static IPv6 prefix, this field is not displayed.

Related commands

ipv6 dhcp client pd

ipv6 prefix

display ipv6 rawip

Use display ipv6 rawip to display brief information about IPv6 RawIP connections.

Syntax

In standalone mode:

display ipv6 rawip [ slot slot-number ]

In IRF mode:

display ipv6 rawip [ chassis chassis-number slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays brief information about IPv6 RawIP connections for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command displays brief information about IPv6 RawIP connections for all cards if you do not specify a card. On an IRF 3 system, this command displays brief information about IPv6 RawIP connections for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

Examples

# (In standalone mode.) Display brief information about IPv6 RawIP connections.

<Sysname> display ipv6 rawip

Local Addr Foreign Addr Protocol Slot Cpu PCB

2001:2002:2003:2 3001:3002:3003:3 58 1 0 0x0000000000000009

004:2005:2006:20 004:3005:3006:30

07:2008 07:3008

2002::100 2002::138 58 2 0 0x0000000000000008

:: :: 58 5 0 0x0000000000000002

Table 10 Command output

Field	Description
Local Addr	Local IPv6 address.
Foreign Addr	Peer IPv6 address.
Protocol	Protocol number.
PCB	PCB index.

display ipv6 rawip verbose

Use display ipv6 rawip verbose to display detailed information about IPv6 RawIP connections.

Syntax

In standalone mode:

display ipv6 rawip verbose [ slot slot-number [ pcb pcb-index ] ]

In IRF mode:

display ipv6 rawip verbose [ chassis chassis-number slot slot-number [ pcb pcb-index ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

pcb pcb-index: Displays detailed information about IPv6 RawIP connections of the specified PCB. The value range for the pcb-index argument is 1 to 16.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays detailed information about IPv6 RawIP connections for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command displays detailed information about IPv6 RawIP connections for all cards if you do not specify a card. On an IRF 3 system, this command displays detailed information about IPv6 RawIP connections for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

Examples

# (In standalone mode.) Display detailed information about an IPv6 RawIP connection.

<Sysname> display ipv6 rawip verbose

Total RawIP socket number: 1

Location: slot: 6 cpu: 0

Creator: ping ipv6[320]

State: N/A

Options: N/A

Error: 0

Receiving buffer(cc/hiwat/lowat/drop/state): 0 / 9216 / 1 / 0 / N/A

Sending buffer(cc/hiwat/lowat/state): 0 / 9216 / 512 / N/A

Type: 3

Protocol: 58

Connection info: src = ::, dst = ::

Inpcb flags: N/A

Inpcb extflag: INP_EXTRCVICMPERR INP_EXTFILTER

Inpcb vflag: INP_IPV6

Hop limit: 255 (minimum hop limit: 0)

Send VRF: 0xffff

Receive VRF: 0xffff

Table 11 Command output

Field	Description
Total RawIP socket number	Total number of IPv6 RawIP sockets.
Creator	Task name of the socket. The process number is in the square brackets.
State	Socket state.
Options	Socket options.
Error	Error code.
Receiving buffer (cc/hiwat/lowat/drop/state)	Displays receive buffer information in the following order: · cc—Used space. · hiwat—Maximum space. · lowat—Minimum space. · drop—Number of dropped packets. · state—Buffer state: ¡ CANTSENDMORE—Unable to send data to the peer. ¡ CANTRCVMORE—Unable to receive data from the peer. ¡ RCVATMARK—Receiving tag. ¡ N/A—None of the above states.
Sending buffer(cc/hiwat/lowat/state)	Displays send buffer information in the following order: · cc—Used space. · hiwat—Maximum space. · lowat—Minimum space. · state—Buffer state: ¡ CANTSENDMORE—Unable to send data to the peer. ¡ CANTRCVMORE—Unable to receive data from the peer. ¡ RCVATMARK—Receiving tag. ¡ N/A—None of the above states.
Type	Socket type: · 1—SOCK_STREAM. This socket uses TCP to provide reliable transmission of byte streams. · 2—SOCK_DGRAM. This socket uses UDP to provide datagram transmission. · 3—SOCK_RAW. This socket allows an application to change the next upper-layer protocol header. · N/A—None of the above types.
Protocol	Number of protocol using the socket. 58 represents ICMP.
Connection info	Connection information, including the source and destination IPv6 addresses.
Inpcb flags	Flags in the Internet PCB: · INP_RECVOPTS—Receives IPv6 options. · INP_RECVRETOPTS—Receives replied IPv6 options. · INP_RECVDSTADDR—Receives destination IPv6 address. · INP_HDRINCL—Provides the entire IPv6 header. · INP_REUSEADDR—Reuses the IPv6 address. · INP_REUSEPORT—Reuses the port number. · INP_ANONPORT—Port number not specified. · INP_PROTOCOL_PACKET—Identifies a protocol packet. · INP_RCVVLANID—Receives the VLAN ID of the packet. Only UDP and RawIP support this flag. · IN6P_IPV6_V6ONLY—Only supports IPv6 protocol stack. · IN6P_PKTINFO—Receives the source IPv6 address and input interface of the packet. · IN6P_HOPLIMIT—Receives the hop limit. · IN6P_HOPOPTS—Receives the hop-by-hop options extension header. · IN6P_DSTOPTS—Receives the destination options extension header. · IN6P_RTHDR—Receives the routing extension header. · IN6P_RTHDRDSTOPTS—Receives the destination options extension header preceding the routing extension header. · IN6P_TCLASS—Receives the traffic class of the packet. · IN6P_AUTOFLOWLABEL—Attaches a flow label automatically. · IN6P_RFC2292—Uses the API specified in RFC 2292. · IN6P_MTU—Discovers differences in the MTU size of every link along a given data path. TCP does not support this flag. · INP_RCVMACADDR—Receives the MAC address of the frame. · INP_USEICMPSRC—Uses the specified IPv6 address as the source IPv6 address for outgoing ICMP packets. · INP_SYNCPCB—Waits until Internet PCB is synchronized. · N/A—None of the above flags.
Inpcb extflag	Extension flags in the Internet PCB: · INP_EXTRCVPVCIDX—Records the PVC index of the received packet. · INP_RCVPWID—Records the PW ID of the received packet. · INP_EXTRCVICMPERR—Receives an ICMP error packet. · INP_EXTFILTER—Filters the contents in the received packet. · N/A—None of the above flags.
Inpcb vflag	IP version flag in the Internet PCB: · INP_IPV4—IPv4 protocol. · INP_IPV6—IPv6 protocol. · INP_IPV6PROTO—Creates an Internet PCB based on IPv6 protocol. · INP_TIMEWAIT—In TIMEWAIT state. · INP_ONESBCAST—Sends broadcast packets. · INP_DROPPED—Protocol dropped flag. · INP_SOCKREF—Strong socket reference. · INP_DONTBLOCK—Do not block synchronization of the Internet PCB. · N/A—None of the above flags.
Hop limit	Hop limit in the Internet PCB.
Send VRF	Sent instances.
Receive VRF	Received instances.

display ipv6 statistics

Use display ipv6 statistics to display IPv6 and ICMPv6 packet statistics.

Syntax

In standalone mode:

display ipv6 statistics [ slot slot-number ]

In IRF mode:

display ipv6 statistics [ chassis chassis-number slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays IPv6 and ICMPv6 packet statistics for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command displays IPv6 and ICMPv6 packet statistics for all cards if you do not specify a card. On an IRF 3 system, this command displays IPv6 and ICMPv6 packet statistics for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

Examples

# Display IPv6 and ICMPv6 packet statistics.

<Sysname> display ipv6 statistics

IPv6 statistics:

Sent packets:

Total: 0

Sent locally: 0 Forwarded: 0

Raw packets: 0 Discarded: 0

Fragments: 0 Fragments failed: 0

Routing failed: 0

Received packets:

Total: 0

Received locally: 0 Hop limit exceeded: 0

Fragments: 0 Reassembled: 0

Reassembly failures: 0 Reassembly timeout: 0

Format errors: 0 Option errors: 0

Protocol errors: 0

ICMPv6 statistics:

Sent packets:

Total: 0

Unreachable: 0 Too big: 0

Hop limit exceeded: 0 Reassembly timeouts: 0

Parameter problems: 0

Echo requests: 0 Echo replies: 0

Neighbor solicits: 0 Neighbor adverts: 0

Router solicits: 0 Router adverts: 0

Redirects: 0 Router renumbering: 0

Send failed:

Rate limitation: 0 Other errors: 0

Received packets:

Total: 0

Checksum errors: 0 Too short: 0

Bad codes: 0

Unreachable: 0 Too big: 0

Hop limit exceeded: 0 Reassembly timeouts: 0

Parameter problems: 0 Unknown error types: 0

Echo requests: 0 Echo replies: 0

Neighbor solicits: 0 Neighbor adverts: 0

Router solicits: 0 Router adverts: 0

Redirects: 0 Router renumbering: 0

Unknown info types: 0

Deliver failed:

Bad length: 0

Related commands

reset ipv6 statistics

display ipv6 tcp

Use display ipv6 tcp to display brief information about IPv6 TCP connections.

Syntax

In standalone mode:

display ipv6 tcp [ slot slot-number ]

In IRF mode:

display ipv6 tcp [ chassis chassis-number slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays brief information about IPv6 TCP connections for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command displays brief information about IPv6 TCP connections for all cards if you do not specify a card. On an IRF 3 system, this command displays brief information about IPv6 TCP connections for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

Examples

# (In standalone mode.) Display brief information about IPv6 TCP connections.

<Sysname> display ipv6 tcp

*: TCP connection with authentication

LAddr->port FAddr->port State Slot CPU PCB

*2001:2002:2003:2 3001:3002:3003:3 ESTABLISHED 1 0 0x000000000000c387

004:2005:2006:20 004:3005:3006:30

07:2008->1200 07:3008->1200

2001::1->23 2001::5->1284 ESTABLISHED 2 0 0x0000000000000008

2003::1->25 2001::2->1283 LISTEN 3 0 0x0000000000000009

Table 12 Command output

Field	Description
*	Indicates that the TCP connection uses authentication.
LAddr->port	Local IPv6 address and port number.
FAddr->port	Peer IPv6 address and port number.
State	IPv6 TCP connection state.
PCB	PCB index.

display ipv6 tcp verbose

Use display ipv6 tcp verbose to display detailed information about IPv6 TCP connections.

Syntax

In standalone mode:

display ipv6 tcp verbose [ slot slot-number [ pcb pcb-index ] ]

In IRF mode:

display ipv6 tcp verbose [ chassis chassis-number slot slot-number [ pcb pcb-index ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

pcb pcb-index: Displays detailed information about IPv6 TCP connections of the specified PCB. The value range for the pcb-index argument is 1 to 16.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays detailed information about IPv6 TCP connections for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command displays detailed information about IPv6 TCP connections for all cards if you do not specify a card. On an IRF 3 system, this command displays detailed information about IPv6 TCP connections for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

Examples

# (In standalone mode.) Display detailed information about an IPv6 TCP connection.

<Sysname> display ipv6 tcp verbose

TCP inpcb number: 1(tcpcb number: 1)

Location: Slot: 6 Cpu: 0

NSR standby: N/A

Creator: bgpd[199]

State: ISCONNECTED

Options: N/A

Error: 0

Receiving buffer(cc/hiwat/lowat/state): 0 / 65536 / 1 / N/A

Sending buffer(cc/hiwat/lowat/state): 0 / 65536 / 512 / N/A

Type: 1

Protocol: 6

Connection info: src = 2001::1->179 , dst = 2001::2->4181

Inpcb flags: N/A

Inpcb extflag: N/A

Inpcb vflag: INP_IPV6

Hop limit: 255 (minimum hop limit: 0)

Connection state: ESTABLISHED

TCP options: TF_REQ_SCALE TF_REQ_TSTMP TF_SACK_PERMIT TF_NSR

NSR state: READY(M)

Send VRF: 0x0

Receive VRF: 0x0

Table 13 Command output

Field	Description
TCP inpcb number	Number of IPv6 TCP Internet PCBs.
tcpcb number	Number of IPv6 TCP PCBs (excluding PCBs of TCP in TIME_WAIT state).
Creator	Task name of the socket. The process number is in the square brackets.
State	Socket state.
Options	Socket options.
Error	Error code.
Receiving buffer(cc/hiwat/lowat/state)	Displays receive buffer information in the following order: · cc—Used space. · hiwat—Maximum space. · lowat—Minimum space. · state—Buffer state: ¡ CANTSENDMORE—Unable to send data to the peer. ¡ CANTRCVMORE—Unable to receive data from the peer. ¡ RCVATMARK—Receiving tag. ¡ N/A—None of the above states.
Sending buffer(cc/hiwat/lowat/state)	Displays send buffer information in the following order: · cc—Used space. · hiwat—Maximum space. · lowat—Minimum space. · state—Buffer state: ¡ CANTSENDMORE—Unable to send data to the peer. ¡ CANTRCVMORE—Unable to receive data from the peer. ¡ RCVATMARK—Receiving tag. ¡ N/A—None of the above states.
Type	Socket type: · 1—SOCK_STREAM. This socket uses TCP to provide reliable transmission of byte streams. · 2—SOCK_DGRAM. This socket uses UDP to provide datagram transmission. · 3—SOCK_RAW. This socket allows an application to change the next upper-layer protocol header. · N/A—None of the above types.
Protocol	Number of the protocol using the socket. 6 represents TCP.
Connection info	Connection information, including source IPv6 address and port number, and destination IPv6 address and port number.
Inpcb flags	Flags in the Internet PCB: · INP_RECVOPTS—Receives IPv6 options. · INP_RECVRETOPTS—Receives replied IPv6 options. · INP_RECVDSTADDR—Receives destination IPv6 address. · INP_HDRINCL—Provides the entire IPv6 header. · INP_REUSEADDR—Reuses the IPv6 address. · INP_REUSEPORT—Reuses the port number. · INP_ANONPORT—Port number not specified. · INP_PROTOCOL_PACKET—Identifies a protocol packet. · INP_RCVVLANID—Receives the VLAN ID of the packet. Only UDP and RawIP support this flag. · IN6P_IPV6_V6ONLY—Only supports IPv6 protocol stack. · IN6P_PKTINFO—Receives the source IPv6 address and input interface of the packet. · IN6P_HOPLIMIT—Receives the hop limit. · IN6P_HOPOPTS—Receives the hop-by-hop options extension header. · IN6P_DSTOPTS—Receives the destination options extension header. · IN6P_RTHDR—Receives the routing extension header. · IN6P_RTHDRDSTOPTS—Receives the destination options extension header preceding the routing extension header. · IN6P_TCLASS—Receives the traffic class of the packet. · IN6P_AUTOFLOWLABEL—Attaches a flow label automatically. · IN6P_RFC2292—Uses the API specified in RFC 2292. · IN6P_MTU—Discovers differences in the MTU size of every link along a given data path. TCP does not support this flag. · INP_RCVMACADDR—Receives the MAC address of the frame. · INP_SYNCPCB—Waits until Internet PCB is synchronized. · N/A—None of the above flags.
Inpcb extflag	Extension flags in the Internet PCB: · INP_EXTRCVPVCIDX—Records the PVC index of the received packet. · INP_RCVPWID—Records the PW ID of the received packet. · INP_EXTDONTDROP—Does not drop the received packet. · N/A—None of the above flags.
Inpcb vflag	IP version flags in the Internet PCB: · INP_IPV4—IPv4 protocol. · INP_IPV6—IPv6 protocol. · INP_IPV6PROTO—Creates an Internet PCB based on IPv6 protocol. · INP_TIMEWAIT—In TIMEWAIT state. · INP_ONESBCAST—Sends broadcast packets. · INP_DROPPED—Protocol dropped flag. · INP_SOCKREF—Strong socket reference. · INP_DONTBLOCK—Do not block synchronization of the Internet PCB. · N/A—None of the above flags.
Hop limit	Hop limit in the Internet PCB.
Connection state	TCP connection state: · CLOSED—The server receives a disconnection request's reply from the client. · LISTEN—The server is waiting for connection requests. · SYN_SENT—The client is waiting for the server to reply to the connection request. · SYN_RCVD—The server receives a connection request. · ESTABLISHED—The server and client have established connections and can transmit data bidirectionally. · CLOSE_WAIT—The server receives a disconnection request from the client. · FIN_WAIT_1—The client is waiting for the server to reply to a disconnection request. · CLOSING—The server and client are waiting for peer's disconnection reply when receiving disconnection requests from each other. · LAST_ACK—The server is waiting for the client to reply to a disconnection request. · FIN_WAIT_2—The client receives a disconnection reply from the server. · TIME_WAIT—The client receives a disconnection request from the server.
TCP options	TCP options: · TF_MD5SIG—Enables MD5 signature. · TF_NODELAY—Disables the Nagle algorithm that buffers the sent data inside the TCP. · TF_NOOPT—No TCP options. · TF_NOPUSH—Forces TCP to delay sending any TCP data until a full sized segment is buffered in the TCP buffers. · TF_BINDFOREIGNADDR—Binds the peer IP address. · TF_NSR—Enables TCP NSR. · TF_REQ_SCALE—Enables the TCP window scale option. · TF_REQ_TSTMP—Enables the time stamp option. · TF_SACK_PERMIT—Enables the TCP selective acknowledgement option. · TF_ENHANCED_AUTH—Enables the enhanced authentication option.
NSR state	State of the TCP connections. Between the parentheses is the role of the connection: · M—Main connection. · S—Standby connection.
Send VRF	Sent instances.
Receive VRF	Received instances.

display ipv6 udp

Use display ipv6 udp to display brief information about IPv6 UDP connections.

Syntax

In standalone mode:

display ipv6 udp [ slot slot-number ]

In IRF mode:

display ipv6 udp [ chassis chassis-number slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays brief information about IPv6 UDP connections for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command displays brief information about IPv6 UDP connections for all cards if you do not specify a card. On an IRF 3 system, this command displays brief information about IPv6 UDP connections for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

Examples

# (In standalone mode.) Displays brief information about IPv6 UDP connections.

<Sysname> display ipv6 udp

LAddr->port FAddr->port Slot Cpu PCB

2001:2002:2003:2 3001:3002:3003:3 1 0 0x000000000000c387

004:2005:2006:20 004:3005:3006:30

07:2008->1200 07:3008->1200

2001::1->23 2001::5->1284 2 0 0x0000000000000008

2003::1->25 2001::2->1283 3 0 0x0000000000000009

Table 14 Command output

Field	Description
LAddr->port	Local IPv6 address and port number.
FAddr->port	Peer IPv6 address and port number.
PCB	PCB index.

display ipv6 udp verbose

Use display ipv6 udp verbose to display detailed information about IPv6 UDP connections.

Syntax

In standalone mode:

display ipv6 udp verbose [ slot slot-number [ pcb pcb-index ] ]

In IRF mode:

display ipv6 udp verbose [ chassis chassis-number slot slot-number [ pcb pcb-index ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

pcb pcb-index: Displays detailed information about IPv6 UDP connections of the specified PCB. The value range for the pcb-index argument is 1 to 16.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays detailed information about IPv6 UDP connections for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command displays detailed information about IPv6 UDP connections for all cards if you do not specify a card. On an IRF 3 system, this command displays detailed information about IPv6 UDP connections for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

Examples

# (In standalone mode.) Display detailed information about an IPv6 UDP connection.

<Sysname> display ipv6 udp verbose

Total UDP socket number: 1

Location: slot: 6 cpu: 0

Creator: sock_test_mips[250]

State: N/A

Options: N/A

Error: 0

Receiving buffer(cc/hiwat/lowat/drop/state): 0 / 41600 / 1 / 0 / N/A

Sending buffer(cc/hiwat/lowat/state): 0 / 9216 / 512 / N/A

Type: 2

Protocol: 17

Connection info: src = ::->69, dst = ::->0

Inpcb flags: N/A

Inpcb extflag: N/A

Inpcb vflag: INP_IPV6

Hop limit: 255 (minimum hop limit: 0)

Send VRF: 0xffff

Receive VRF: 0xffff

Table 15 Command output

Field	Description
Total UDP socket number	Total number of IPv6 UDP sockets.
Creator	Task name of the socket. The progress number is in the square brackets.
State	Socket state.
Options	Socket options.
Error	Error code.
Receiving buffer(cc/hiwat/lowat/drop/state)	Displays receive buffer information in the following order: · cc—Used space. · hiwat—Maximum space. · lowat—Minimum space. · drop—Number of dropped packets. · state—Buffer state: ¡ CANTSENDMORE—Unable to send data to the peer. ¡ CANTRCVMORE—Unable to receive data from the peer. ¡ RCVATMARK—Receiving tag. ¡ N/A—None of the above states.
Sending buffer(cc/hiwat/lowat/state)	Displays send buffer information in the following order: · cc—Used space. · hiwat—Maximum space. · lowat—Minimum space. · state—Buffer state: ¡ CANTSENDMORE—Unable to send data to the peer. ¡ CANTRCVMORE—Unable to receive data from the peer. ¡ RCVATMARK—Receiving tag. ¡ N/A—None of the above states.
Type	Socket type: · 1—SOCK_STREAM. This socket uses TCP to provide reliable transmission of byte streams. · 2—SOCK_DGRAM. This socket uses UDP to provide datagram transmission. · 3—SOCK_RAW. This socket allows an application to change the next upper-layer protocol header. · N/A—None of the above types.
Protocol	Number of the protocol using the socket. 17 represents UDP.
Connection info	Connection information, including source IPv6 address and port number, and destination IPv6 address and port number.
Inpcb flags	Flags in the Internet PCB: · INP_RECVOPTS—Receives IPv6 options. · INP_RECVRETOPTS—Receives replied IPv6 options. · INP_RECVDSTADDR—Receives destination IPv6 address. · INP_HDRINCL—Provides the entire IPv6 header. · INP_REUSEADDR—Reuses the IPv6 address. · INP_REUSEPORT—Reuses the port number. · INP_ANONPORT—Port number not specified. · INP_PROTOCOL_PACKET—Identifies a protocol packet. · INP_RCVVLANID—Receives the VLAN ID of the packet. Only UDP and RawIP support this flag. · IN6P_IPV6_V6ONLY—Only supports IPv6 protocol stack. · IN6P_PKTINFO—Receives the source IPv6 address and input interface of the packet. · IN6P_HOPLIMIT—Receives the hop limit. · IN6P_HOPOPTS—Receives the hop-by-hop options extension header. · IN6P_DSTOPTS—Receives the destination options extension header. · IN6P_RTHDR—Receives the routing extension header. · IN6P_RTHDRDSTOPTS—Receives the destination options extension header preceding the routing extension header. · IN6P_TCLASS—Receives the traffic class of the packet. · IN6P_AUTOFLOWLABEL—Attaches a flow label automatically. · IN6P_RFC2292—Uses the API specified in RFC 2292. · IN6P_MTU—Discovers differences in the MTU size of every link along a given data path. TCP does not support this flag. · INP_RCVMACADDR—Receives the MAC address of the frame. · INP_SYNCPCB—Waits until Internet PCB is synchronized. · N/A—None of the above flags.
Inpcb extflag	Extension flags in the Internet PCB: · INP_EXTRCVPVCIDX—Records the PVC index of the received packet. · INP_RCVPWID—Records the PW ID of the received packet. · N/A—None of the above flags.
Inpcb vflag	IP version flags in the Internet PCB: · INP_IPV4—IPv4 protocol. · INP_IPV6—IPv6 protocol. · INP_IPV6PROTO—Creates an Internet PCB based on IPv6 protocol. · INP_TIMEWAIT—In TIMEWAIT state. · INP_ONESBCAST—Sends broadcast packets. · INP_DROPPED—Protocol dropped flag. · INP_SOCKREF—Strong socket reference. · INP_DONTBLOCK—Do not block synchronization of the Internet PCB. · N/A—None of the above flags.
Hop limit	Hop limit in the Internet PCB.
Send VRF	Sent instances.
Receive VRF	Received instances.

ipv6 address

Use ipv6 address to configure an IPv6 global unicast address for an interface.

Use undo ipv6 address to delete an IPv6 global unicast address of the interface.

Syntax

ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length }

undo ipv6 address [ ipv6-address prefix-length | ipv6-address/prefix-length ]

Default

No IPv6 global unicast address is configured for an interface.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

ipv6-address: Specifies an IPv6 address.

prefix-length: Specifies a prefix length in the range of 1 to 128.

Usage guidelines

Like public IPv4 addresses, IPv6 global unicast addresses are assigned to ISPs. This type of address allows for prefix aggregation to reduce the number of global routing entries.

If you do not specify any parameters, the undo ipv6 address command deletes all IPv6 addresses of an interface.

Examples

# Set the IPv6 global unicast address of VLAN-interface 100 to 2001::1 with prefix length 64.

Method 1:

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address 2001::1/64

Method 2:

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address 2001::1 64

ipv6 address anycast

Use ipv6 address anycast to configure an IPv6 anycast address for an interface.

Use undo ipv6 address anycast to delete the IPv6 anycast address of the interface.

Syntax

ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length } anycast

undo ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length } anycast

Default

No IPv6 anycast address is configured for an interface.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

ipv6-address: Specifies an IPv6 anycast address.

prefix-length: Specifies a prefix length in the range of 1 to 128.

Examples

# Set the IPv6 anycast address of VLAN-interface 100 to 2001::1 with prefix length 64.

Method 1:

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address 2001::1/64 anycast

Method 2:

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address 2001::1 64 anycast

ipv6 address auto

Use ipv6 address auto to enable the stateless address autoconfiguration feature on an interface, so that the interface can automatically generate a global unicast address.

Use undo ipv6 address auto to disable this feature.

Syntax

ipv6 address auto

undo ipv6 address auto

Default

The stateless address autoconfiguration feature is disabled.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

After a global unicast address is generated through stateless autoconfiguration, a link-local address is generated automatically.

To delete the global unicast address and the link-local address that are automatically generated, use either of the following commands:

· undo ipv6 address auto

· undo ipv6 address

Examples

# Enable stateless address autoconfiguration on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address auto

ipv6 address auto link-local

Use ipv6 address auto link-local to automatically generate a link-local address for an interface.

Use undo ipv6 address auto link-local to restore the default.

Syntax

ipv6 address auto link-local

undo ipv6 address auto link-local

Default

No link-local address is configured on an interface. A link-local address is automatically generated after an IPv6 global unicast address is configured for the interface.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

Link-local addresses are used for neighbor discovery and stateless autoconfiguration on the local link. Packets using link-local addresses as the source or destination addresses cannot be forwarded to other links.

After an IPv6 global unicast address is configured for an interface, a link-local address is automatically generated. This link-local address is the same as the one generated by using the ipv6 address auto link-local command.

The undo ipv6 address auto link-local command deletes only the link-local addresses generated through the ipv6 address auto link-local command. If the undo command is executed on an interface with an IPv6 global unicast address configured, the interface still has a link-local address.

You can also manually assign an IPv6 link-local address for an interface by using the ipv6 address link-local command. Manual assignment takes precedence over automatic generation for IPv6 link-local addresses.

· If you first use automatic generation and then manual assignment, the manually assigned link-local address overwrites the automatically generated address.

· If you first use manual assignment and then automatic generation, both of the following occur:

¡ The automatically generated link-local address does not take effect.

¡ The link-local address of an interface is still the manually assigned address.

If you delete the manually assigned address, the automatically generated link-local address takes effect.

Examples

# Configure VLAN-interface 100 to automatically generate a link-local address.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address auto link-local

Related commands

ipv6 address link-local

ipv6 address eui-64

Use ipv6 address eui-64 to configure an EUI-64 IPv6 address for an interface.

Use undo ipv6 address eui-64 to delete an EUI-64 IPv6 address from an interface.

Syntax

ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length } eui-64

undo ipv6 address [ ipv6-address prefix-length | ipv6-address/prefix-length ] eui-64

Default

No EUI-64 IPv6 address is configured for an interface.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

ipv6-address/prefix-length: Specifies an IPv6 address and IPv6 prefix length. The ipv6-address and prefix-length arguments jointly specify the prefix of an EUI-64 IPv6 address. The value range for the prefix-length argument is 1 to 64.

Usage guidelines

An EUI-64 IPv6 address is generated based on the specified prefix and the automatically generated interface ID. To display the EUI-64 IPv6 address, use the display ipv6 interface command.

The prefix length of an EUI-64 IPv6 address cannot be greater than 64.

Examples

# Configure an EUI-64 IPv6 address for VLAN-interface 100. The prefix of the address is the same as that of 2001::1/64, and the interface ID is generated based on the MAC address of the device.

Method 1:

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address 2001::1/64 eui-64

Method 2:

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address 2001::1 64 eui-64

Related commands

display ipv6 interface

ipv6 address link-local

Use ipv6 address link-local to configure a link-local address for the interface.

Use undo ipv6 address link-local to restore the default.

Syntax

ipv6 address ipv6-address link-local

undo ipv6 address ipv6-address link-local

Default

No link-local address is configured for the interface.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

ipv6-address: Specifies an IPv6 link-local address. The first 10 bits of an address must be 1111111010 (binary). The first group of hexadecimals in the address must be FE80 to FEBF.

Usage guidelines

Manual assignment takes precedence over automatic generation.

If you use automatic generation, and then use manual assignment, the manually assigned link-local address overwrites the one that is automatically generated.

If you use manual assignment and then use automatic generation, both of the following occur:

· The automatically generated link-local address does not take effect.

· The manually assigned link-local address of an interface remains.

After you delete the manually assigned address, the automatically generated link-local address takes effect. For automatic generation of an IPv6 link-local address, see the ipv6 address auto link-local command.

Examples

# Configure a link-local address for VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address fe80::1 link-local

Related commands

ipv6 address auto link-local

ipv6 address prefix-number

Use ipv6 address prefix-number to specify an IPv6 prefix for an interface to automatically generate an IPv6 global unicast address and advertise the prefix.

Use undo ipv6 address prefix-number to restore the default.

Syntax

ipv6 address prefix-number sub-prefix/prefix-length

undo ipv6 address prefix-number

Default

No IPv6 prefix is specified for IPv6 address autoconfiguration.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

prefix-number: Specifies an IPv6 prefix by its ID in the range of 1 to 1024. The specified IPv6 prefix can be manually configured or obtained through DHCPv6.

sub-prefix: Specifies the sub-prefix bit and host bit for the IPv6 global unicast address.

prefix-length: Specifies the sub-prefix length in the range of 1 to 128.

Usage guidelines

This command enables an interface to automatically generate an IPv6 global unicast address based on the specified IPv6 prefix, sub-prefix bit, and host bit.

An interface can generate only one IPv6 global unicast address based on the prefix specified by using the ipv6 address command. To configure the interface to generate a new IPv6 address, execute the undo ipv6 address command to delete the configuration, and then execute the ipv6 address command.

Examples

# Configure a static IPv6 prefix AAAA::/16 and assign ID 1 to the prefix. Configure VLAN-interface 100 to use this prefix to generate the IPv6 address AAAA:CCCC:DDDD::10/32 and advertise this prefix.

<Sysname> system-view

[Sysname] ipv6 prefix 1 AAAA::/16

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address 1 BBBB:CCCC:DDDD::10/32

# Configure VLAN-interface 10 to obtain an IPv6 prefix through DHCPv6 and assign ID 2 to the obtained prefix. Configure VLAN-interface 100 to use the obtained prefix to generate the IPv6 address AAAA:CCCC:DDDD::10/32 and advertise the prefix.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] ipv6 dhcp client pd 2 rapid-commit option-group 1

[Sysname-Vlan-interface10] quit

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 address 2 BBBB:CCCC:DDDD::10/32

Related commands

ipv6 prefix

ipv6 dhcp client pd

ipv6 extension-header drop enable

Use ipv6 extension-header drop enable to enable a device to discard IPv6 packets that contain extension headers.

Use undo ipv6 extension-header drop enable to disable a device from discarding IPv6 packets that contain extension headers.

Syntax

ipv6 extension-header drop enable

undo ipv6 extension-header drop enable

Default

A device does not discard IPv6 packets that contain extension headers.

Views

System view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

This feature enables a device to discard a received IPv6 packet in which the extension headers cannot be processed by the device.

Examples

# Enable the device to discard IPv6 packets that contain extension headers.

<Sysname> system-view

[Sysname] ipv6 extension-header drop enable

ipv6 hop-limit

Use ipv6 hop-limit to set the Hop Limit field in the IPv6 header.

Use undo ipv6 hop-limit to restore the default.

Syntax

ipv6 hop-limit value

undo ipv6 hop-limit

Default

The hop limit is 64.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

value: Specifies the number of hops, in the range of 1 to 255.

Usage guidelines

The hop limit determines the number of hops that an IPv6 packet generated by the device can travel.

The device advertises the hop limit in RA messages. All RA message receivers use the advertised value to fill in the Hop Limit field for IPv6 packets to be sent. To disable the device from advertising the hop limit, use the ipv6 nd ra hop-limit unspecified command.

Examples

# Set the maximum number of hops to 100.

<Sysname> system-view

[Sysname] ipv6 hop-limit 100

Related commands

ipv6 nd ra hop-limit unspecified

ipv6 hoplimit-expires enable

Use ipv6 hoplimit-expires enable to enable sending ICMPv6 time exceeded messages.

Use undo ipv6 hoplimit-expires to disable sending ICMPv6 time exceeded messages.

Syntax

ipv6 hoplimit-expires enable

undo ipv6 hoplimit-expires enable

Default

Sending ICMPv6 time exceeded messages is enabled.

Views

System view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

ICMPv6 time exceeded messages are sent to the source of IPv6 packets after the device discards IPv6 packets because hop or reassembly times out.

To prevent too many ICMPv6 error messages from affecting device performance, disable this feature. Even with the feature disabled, the device still sends fragment reassembly time exceeded messages.

Examples

# Disable sending ICMPv6 time exceeded messages.

<Sysname> system-view

[Sysname] undo ipv6 hoplimit-expires enable

ipv6 icmpv6 error-interval

Use ipv6 icmpv6 error-interval to set the bucket size and the interval for tokens to arrive in the bucket for ICMPv6 error messages.

Use undo ipv6 icmpv6 error-interval to restore the default.

Syntax

ipv6 icmpv6 error-interval interval [ bucketsize ]

undo ipv6 icmpv6 error-interval

Default

The bucket allows a maximum of 10 tokens, and a token is placed in the bucket every 100 milliseconds.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

interval: Specifies the interval for tokens to arrive in the bucket. The value range is 0 to 2147483647 milliseconds. To disable the ICMPv6 rate limit, set the value to 0.

bucketsize: Specifies the maximum number of tokens allowed in the bucket. The value range is 1 to 200.

Usage guidelines

This command limits the rate at which ICMPv6 error messages are sent. Use this command to prevent network congestion caused by excessive ICMPv6 error messages generated within a short period. A token bucket algorithm is used with one token representing one ICMPv6 error message.

A token is placed in the bucket at intervals until the maximum number of tokens that the bucket can hold is reached.

A token is removed from the bucket when an ICMPv6 error message is sent. When the bucket is empty, ICMPv6 error messages are not sent until a new token is placed in the bucket.

Examples

# Set the bucket size to 40 tokens and the interval for tokens to arrive in the bucket to 200 milliseconds for ICMPv6 error messages.

<Sysname> system-view

[Sysname] ipv6 icmpv6 error-interval 200 40

ipv6 icmpv6 multicast-echo-reply enable

Use ipv6 icmpv6 multicast-echo-reply enable to enable replying to multicast echo requests.

Use undo ipv6 icmpv6 multicast-echo-reply to restore the default.

Syntax

ipv6 icmpv6 multicast-echo-reply enable

undo ipv6 icmpv6 multicast-echo-reply enable

Default

The device is disabled from replying to multicast echo requests.

Views

System view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

If a host is configured to reply to multicast echo requests, an attacker can use this mechanism to attack the host. For example, the attacker can send an echo request to a multicast address with Host A as the source. All hosts in the multicast group will send echo replies to Host A.

To prevent attacks, do not enable the device to reply to multicast echo requests unless necessary.

Examples

# Enable replying to multicast echo requests.

<Sysname> system-view

[Sysname] ipv6 icmpv6 multicast-echo-reply enable

ipv6 icmpv6 source

Use ipv6 icmpv6 source to specify an IPv6 address as the source address for outgoing ICMPv6 packets.

Use undo ipv6 icmpv6 source to remove the specified IPv6 source address for outgoing ICMPv6 packets.

Syntax

ipv6 icmpv6 source [ vpn-instance vpn-instance-name ] ipv6-address

undo ipv6 icmpv6 source [ vpn-instance vpn-instance-name ]

Default

No IPv6 source address for outgoing ICMPv6 packets is specified. The device uses the IPv6 address of the sending interface as the source IPv6 address for outgoing ICMPv6 packets.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance to which the specified address belongs. The vpn-instance-name argument represents the VPN instance name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, the ipv6-address argument specifies an IPv6 address on the public network. The specified VPN instance must already exist.

ipv6-address: Specifies an IPv6 address.

Usage guidelines

It is a good practice to specify the IPv6 address of the loopback interface as the source IPv6 address for outgoing ping echo request and ICMPv6 error messages. This feature helps users to easily locate the sending device.

Examples

# Specify IPv6 address 1::1 as the source address for outgoing ICMPv6 packets.

<Sysname> system-view

[Sysname] ipv6 icmpv6 source 1::1

ipv6 mtu

Use ipv6 mtu to configure the MTU of IPv6 packets sent over an interface.

Use undo ipv6 mtu to restore the default MTU.

Syntax

ipv6 mtu size

undo ipv6 mtu

Default

No MTU is configured for an interface.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

size: Specifies the size of the MTUs of an interface in bytes. The value ranges for VLAN interfaces, Layer 3 Ethernet interfaces, and Layer 3 aggregate interfaces are 1280 to 9198, 1280 to 1560, and 1280 to 1500, respectively.

Usage guidelines

IPv6 routers do not support packet fragmentation. After an IPv6 router receives an IPv6 packet, if the packet size is greater than the MTU of the forwarding interface, the router discards the packet. Meanwhile, the router sends the MTU to the source host through an ICMPv6 packet — Packet Too Big message. The source host fragments the packet according to the MTU and resends it. To reduce the extra flow overhead resulting from packet drops, set an appropriate interface MTU for your network.

Examples

# Set the MTU of IPv6 packets sent over VLAN-interface 100 to 1280 bytes.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 mtu 1280

ipv6 nd autoconfig managed-address-flag

Use ipv6 nd autoconfig managed-address-flag to set the managed address configuration flag (M) to 1 in RA advertisements to be sent.

Use undo ipv6 nd autoconfig managed-address-flag to restore the default.

Syntax

ipv6 nd autoconfig managed-address-flag

undo ipv6 nd autoconfig managed-address-flag

Default

The M flag is set to 0 in RA advertisements. Hosts receiving the advertisements will obtain IPv6 addresses through stateless autoconfiguration.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

The M flag in RA advertisements determines whether receiving hosts use stateful autoconfiguration to obtain IPv6 addresses.

· If the M flag is set to 1 in RA advertisements, receiving hosts use stateful autoconfiguration (for example, from an DHCPv6 server) to obtain IPv6 addresses.

· If the M flag is set to 0 in RA advertisements, receiving hosts use stateless autoconfiguration. Stateless autoconfiguration generates IPv6 addresses according to link-layer addresses and the prefix information in the RA advertisements.

Examples

# Set the M flag to 1 in RA advertisements to be sent.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd autoconfig managed-address-flag

ipv6 nd autoconfig other-flag

Use ipv6 nd autoconfig other-flag to set the other stateful configuration flag (O) to 1 in RA advertisements to be sent.

Use undo ipv6 nd autoconfig other-flag to restore the default.

Syntax

ipv6 nd autoconfig other-flag

undo ipv6 nd autoconfig other-flag

Default

The O flag is set to 0 in RA advertisements. Hosts receiving the advertisements will acquire other information through stateless autoconfiguration.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

The O flag in RA advertisements determines whether receiving hosts use stateful autoconfiguration to obtain configuration information other than IPv6 addresses.

· If the O flag is set to 1 in RA advertisements, receiving hosts use stateful autoconfiguration (for example, from a DHCPv6 server) to obtain configuration information other than IPv6 addresses.

· If the O flag is set to 0 in RA advertisements, receiving hosts use stateless autoconfiguration to obtain configuration information other than IPv6 addresses.

Examples

# Set the O flag to 0 in RA advertisements to be sent.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] undo ipv6 nd autoconfig other-flag

ipv6 nd dad attempts

Use ipv6 nd dad attempts to set the number of attempts to send an NS message for DAD.

Use undo ipv6 nd dad attempts to restore the default.

Syntax

ipv6 nd dad attempts interval

undo ipv6 nd dad attempts

Default

The number of attempts to send an NS message for DAD is 1.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

interval: Specifies the number of attempts to send an NS message for DAD, in the range of 0 to 600. If it is set to 0, DAD is disabled.

Usage guidelines

An interface sends an NS message for DAD after obtaining an IPv6 address.

If the interface does not receive a response within the time specified by using ipv6 nd ns retrans-timer, it resends an NS message.

If the interface receives no response after making the maximum sending attempts (set by using ipv6 nd dad attempts), the interface uses the obtained address.

Examples

# Set the number of attempts to send an NS message for DAD to 20.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd dad attempts 20

Related commands

display ipv6 interface

ipv6 nd ns retrans-timer

ipv6 nd mode uni

Use ipv6 nd mode uni to configure a port as a customer-side port.

Use undo ipv6 nd mode to restore the default.

Syntax

ipv6 nd mode uni

undo ipv6 nd mode

Default

A port acts as a network-side port.

Views

VLAN interface view

VSI interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

By default, the device associates an ND entry with routing information when the device learns an ND entry. The ND entry provides the next hop information for routing. To save hardware resources, you can use this command to specify a port that connects to a user terminal as a customer-side port. The device will not associate the routing information with the learned ND entries.

Examples

# Specify VLAN-interface 2 as a customer-side port.

<Sysname> system-view

[Sysname] interface vlan-interface 2

[Sysname-Vlan-interface2] ipv6 nd mode uni

ipv6 nd ns retrans-timer

Use ipv6 nd ns retrans-timer to set the interval for retransmitting an NS message.

Use undo ipv6 nd ns retrans-timer to restore the default.

Syntax

ipv6 nd ns retrans-timer value

undo ipv6 nd ns retrans-timer

Default

The local interface sends NS messages at every an interval of 1000 milliseconds, and the Retrans Timer field in the RA messages sent is 0. The interval for retransmitting an NS message is determined by the receiving device.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

value: Specifies the interval value in the range of 1000 to 4294967295 milliseconds.

Usage guidelines

If a device does not receive a response from the peer within the specified interval, the device resends an NS message. The device retransmits an NS message at the specified interval and uses the interval value to fill the Retrans Timer field in RA messages to be sent.

Examples

# Specify VLAN-interface 100 to retransmit NS messages every 10000 milliseconds.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd ns retrans-timer 10000

Related commands

display ipv6 interface

ipv6 nd nud reachable-time

Use ipv6 nd nud reachable-time to set the neighbor reachable time on an interface.

Use undo ipv6 nd nud reachable-time to restore the default.

Syntax

ipv6 nd nud reachable-time time

undo ipv6 nd nud reachable-time

Default

The neighbor reachable time on the local interface is 30000 milliseconds, and the value of the Reachable Time field in RA messages is 0. The reachable time is determined by the receiving device.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

time: Specifies the neighbor reachable time in the range of 1 to 3600000 milliseconds.

Usage guidelines

If the neighbor reachability detection shows that a neighbor is reachable, the device considers the neighbor reachable within the specified reachable time. If the device must send a packet to the neighbor after the specified reachable time expires, the device reconfirms whether the neighbor is reachable. The device sets the specified value as the neighbor reachable time on the local interface and uses the value to fill the Reachable Time field in RA messages to be sent.

Examples

# Set the neighbor reachable time on VLAN-interface 100 to 10000 milliseconds.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd nud reachable-time 10000

Related commands

display ipv6 interface

ipv6 nd proxy-forwarding

Use ipv6 nd proxy-forwarding to enable the ND proxy forwarding feature.

Use undo ipv6 nd proxy-forwarding to disable the ND proxy forwarding feature.

Syntax

ipv6 nd proxy-forwarding

undo ipv6 nd proxy-forwarding

Default

ND proxy forwarding is disabled.

Views

VLAN interface view

Predefined user roles

network-admin

mdc-admin

Examples

# Enable ND proxy forwarding on VLAN-interface 10.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] ipv6 nd proxy-forwarding

ipv6 nd ra halt

Use ipv6 nd ra halt to suppress an interface from advertising RA messages.

Use undo ipv6 nd ra halt to disable this feature.

Syntax

ipv6 nd ra halt

undo ipv6 nd ra halt

Default

An interface is suppressed from sending RA messages.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Examples

# Disable RA message suppression on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] undo ipv6 nd ra halt

ipv6 nd ra hop-limit unspecified

Use ipv6 nd ra hop-limit unspecified to specify unlimited hops in RA messages.

Use undo ipv6 nd ra hop-limit unspecified to restore the default.

Syntax

ipv6 nd ra hop-limit unspecified

undo ipv6 nd ra hop-limit unspecified

Default

The maximum number of hops in the RA messages is limited to 64.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

To set the maximum number of hops to a value rather than the default setting, use the ipv6 hop-limit command.

Examples

# Specify unlimited hops in the RA messages on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] ipv6 nd ra hop-limit unspecified

Related commands

ipv6 hop-limit

ipv6 nd ra interval

Use ipv6 nd ra interval to set the maximum and minimum intervals for advertising RA messages.

Use undo ipv6 nd ra interval to restore the default.

Syntax

ipv6 nd ra interval max-interval min-interval

undo ipv6 nd ra interval

Default

The maximum interval between RA messages is 600 seconds, and the minimum interval is 200 seconds.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

max-interval: Specifies the maximum interval value in seconds, in the range of 4 to 1800.

min-interval: Specifies the minimum interval value in the range of 3 seconds to three-fourths of the maximum interval.

Usage guidelines

The device advertises RA messages randomly between the maximum interval and the minimum interval.

The maximum interval for sending RA messages should be less than or equal to the router lifetime in RA messages.

Examples

# Set the maximum interval for advertising RA messages to 1000 seconds and the minimum interval to 700 seconds.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd ra interval 1000 700

Related commands

ipv6 nd ra router-lifetime

ipv6 nd ra no-advlinkmtu

Use ipv6 nd ra no-advlinkmtu to turn off the MTU option in RA messages.

Use undo ipv6 nd ra no-advlinkmtu to restore the default.

Syntax

ipv6 nd ra no-advlinkmtu

undo ipv6 nd ra no-advlinkmtu

Default

RA messages contain the MTU option.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

The MTU option in the RA messages specifies the link MTU to ensure that all nodes on the link use the same MTU.

Examples

# Turn off the MTU option in RA messages on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd ra no-advlinkmtu

ipv6 nd ra prefix

Use ipv6 nd ra prefix to configure the prefix information in RA messages.

Use undo ipv6 nd ra prefix to restore the default.

Syntax

ipv6 nd ra prefix { ipv6-prefix prefix-length | ipv6-prefix/prefix-length } [ valid-lifetime preferred-lifetime [ no-autoconfig | off-link ] * | no-advertise ]

undo ipv6 nd ra prefix { ipv6-prefix | ipv6-prefix/prefix-length }

Default

No prefix information is configured for RA messages. Instead, the IPv6 address of the interface sending RA messages is used as the prefix information.

If the IPv6 address is manually configured, the prefix uses the fixed valid lifetime 2592000 seconds (30 days) and preferred lifetime 604800 seconds (7 days).

If the IPv6 address is automatically obtained (through DHCP, for example), the prefix uses the valid and preferred lifetime of the IPv6 address.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

ipv6-prefix: Specifies the IPv6 prefix.

prefix-length: Specifies the prefix length of the IPv6 address.

valid-lifetime: Specifies the valid lifetime of a prefix, in the range of 0 to 4294967295 seconds. The default value is 2592000 seconds (30 days).

preferred-lifetime: Specifies the preferred lifetime of a prefix used for stateless autoconfiguration, in the range of 0 to 4294967295 seconds. The preferred lifetime cannot be longer than the valid lifetime. The default value is 604800 seconds (7 days).

no-autoconfig: Specifies a prefix not to be used for stateless autoconfiguration. If you do not specify this keyword, the prefix is used for stateless autoconfiguration.

off-link: Indicates that the address with the prefix is not directly reachable on the link. If you do not specify this keyword, the address with the prefix is directly reachable on the link.

no-advertise: Disables the device from advertising the prefix specified in this command. If you do not specify this keyword, the device advertises the prefix specified in this command.

Usage guidelines

After hosts on the same link receive RA messages, they can use the prefix information in the RA messages for stateless autoconfiguration.

A prefix specified without a parameter in this command preferentially uses the default settings configured by using the ipv6 nd ra prefix default command. If the default settings are unavailable, the prefix uses the following settings:

· Valid lifetime of 2592000 seconds (30 days).

· Preferred lifetime of 604800 seconds (7 days).

· The prefix is used for stateless autoconfiguration.

· The address with the prefix is directly reachable on the link.

· The prefix is advertised in RA messages.

Examples

# Configure the prefix information in RA messages on VLAN-interface 100.

Method 1:

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd ra prefix 2001:10::100/64 100 10

Method 2:

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd ra prefix 2001:10::100 64 100 10

ipv6 nd ra prefix default

Use ipv6 nd ra prefix default to configure the default settings for prefixes advertised in RA messages.

Use undo ipv6 nd ra prefix default to restore the default.

Syntax

ipv6 nd ra prefix default [ valid-lifetime preferred-lifetime [ no-autoconfig | off-link ] * | no-advertise ]

undo ipv6 nd ra prefix default

Default

No default settings are configured for prefixes advertised in RA messages.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

valid-lifetime: Specifies the valid lifetime of a prefix, in the range of 0 to 4294967295 seconds. The default value is 2592000 seconds (30 days).

no-autoconfig: Specifies a prefix not to be used for stateless autoconfiguration. If you do not specify this keyword, the prefix is used for stateless autoconfiguration.

off-link: Indicates that the address with the prefix is not directly reachable on the link. If you do not specify this keyword, the address with the prefix is directly reachable on the link.

no-advertise: Disables the device from advertising the prefix specified in this command. If you do not specify this keyword, the device advertises the prefix specified in this command.

Usage guidelines

This command specifies the default settings for the prefix specified by using the ipv6 nd ra prefix command. If none of the parameters (valid-lifetime, preferred-lifetime, no-autoconfig, off-link, and no-advertise) is configured in the ipv6 nd ra prefix command, the prefix uses the default settings.

Examples

# Configure the default settings for prefixes advertised in RA messages on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd ra prefix default 100 10

ipv6 nd ra router-lifetime

Use ipv6 nd ra router-lifetime to set the router lifetime in RA messages.

Use undo ipv6 nd ra router-lifetime to restore the default.

Syntax

ipv6 nd ra router-lifetime time

undo ipv6 nd ra router-lifetime

Default

The router lifetime in RA messages is 1800 seconds.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

time: Specifies the router lifetime in the range of 0 to 9000 seconds. If the value is set to 0, the router does not act as the default router.

Usage guidelines

The router lifetime in RA messages specifies how long the router sending the RA messages acts as the default router. Hosts receiving the RA messages check this value to determine whether to use the sending router as the default router. If the router lifetime is 0, the router cannot be used as the default router.

The router lifetime in RA messages must be greater than or equal to the advertising interval.

Examples

# Set the router lifetime in RA messages on VLAN-interface 100 to 1000 seconds.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd ra router-lifetime 1000

Related commands

ipv6 nd ra interval

ipv6 nd router-preference

Use ipv6 nd router-preference to set a router preference in RA messages.

Use undo ipv6 nd router-preference to restore the default.

Syntax

ipv6 nd router-preference { high | low | medium }

undo ipv6 nd router-preference

Default

The router preference is medium.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Parameters

high: Sets the router preference to the highest setting.

low: Sets the router preference to the lowest setting.

medium: Sets the router preference to the medium setting.

Usage guidelines

A hosts selects a router with the highest preference as the default router.

When router preferences are the same in RA messages, a host selects the router corresponding to the first received RA message as the default gateway.

Examples

# Set the router preference in RA messages to the highest on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 nd router-preference high

ipv6 nd snooping enable global

Use ipv6 nd snooping enable global to enable ND snooping for global unicast addresses.

Use undo ipv6 nd snooping enable global to disable ND snooping for global unicast addresses.

Syntax

ipv6 nd snooping enable global

undo ipv6 nd snooping enable global

Default

ND snooping is disabled for global unicast addresses.

Views

VLAN view

Predefined user roles

network-admin

mdc-admin

Examples

# Enable ND snooping for global unicast addresses.

<Sysname> system-view

[Sysname] vlan 2

[Sysname-vlan2] ipv6 nd snooping enable global

ipv6 nd snooping enable link-local

Use ipv6 nd snooping enable link-local to enable ND snooping for link-local addresses.

Use undo ipv6 nd snooping enable link-local to disable ND snooping for link-local addresses.

Syntax

ipv6 nd snooping enable link-local

undo ipv6 nd snooping enable link-local

Default

ND snooping is disabled for link-local addresses.

Views

VLAN view

Predefined user roles

network-admin

mdc-admin

Examples

# Enable ND snooping for link-local addresses.

<Sysname> system-view

[Sysname] vlan 2

[Sysname-vlan2] ipv6 nd snooping enable link-local

ipv6 nd snooping glean source

Use ipv6 nd snooping glean source to enable ND snooping for data packets from unknown sources.

Use undo ipv6 nd snooping glean source to disable ND snooping for data packets from unknown sources.

Syntax

ipv6 nd snooping glean source

undo ipv6 nd snooping glean source

Default

ND snooping is disabled for data packets from unknown sources.

Views

VLAN view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

This command enables the device to learn ND snooping entries from data packets originated by unknown sources.

For this command to take effect, execute the ipv6 nd snooping enable global command or the ipv6 nd snooping enable link-local command.

Before enabling ND snooping entries learning from data packets for a VLAN, you must configure IPv6 source guard on all untrusted interfaces in the same VLAN. This operation ensures correct forwarding of the data packets received all these interfaces.

Examples

# Enable ND snooping for data packets from unknown sources.

<Sysname> system-view

[Sysname] vlan 2

[Sysname-vlan2] ipv6 nd snooping glean source

ipv6 nd snooping max-learning-num

Use ipv6 nd snooping max-learning-num to set the maximum number of ND snooping entries that an interface can learn.

Use undo ipv6 nd snooping max-learning-num to restore the default.

Syntax

ipv6 nd snooping max-learning-num max-number

undo ipv6 nd snooping max-learning-num

Default

An interface can learn a maximum of 1024 ND snooping entries.

Views

Layer 2 Ethernet interface view

Layer 2 aggregate interface view

Predefined user roles

network-admin

mdc-admin

Parameters

max-number: Specifies the maximum number of ND snooping entries that an interface can learn. The value range for this argument is 1 to 1024.

Examples

# Allow Ten-GigabitEthernet 1/0/1 to learn a maximum of 64 ND snooping entries.

<Sysname> system-view

[Sysname] interface ten-gigabitethernet 1/0/1

[Sysname-Ten-GigabitEthernet1/0/1] ipv6 nd snooping max-learning-num 64

ipv6 neighbor

Use ipv6 neighbor to configure a static neighbor entry.

Use undo ipv6 neighbor to delete a static neighbor entry.

Syntax

ipv6 neighbor ipv6-address mac-address { vlan-id port-type port-number | interface interface-type interface-number } [ vpn-instance vpn-instance-name ]

undo ipv6 neighbor ipv6-address interface-type interface-number

Default

No static neighbor entries exist.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

ipv6-address: Specifies the IPv6 address of the static neighbor entry.

mac-address: Specifies the MAC address (48 bits) of the static neighbor entry, in the format of H-H-H.

vlan-id: Specifies the VLAN ID of the static neighbor entry, in the range of 1 to 4094.

port-type port-number: Specifies a Layer 2 port of the static neighbor entry by its type and number.

interface interface-type interface-number: Specifies a Layer 3 interface of the static neighbor entry by its type and number.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance to which the static neighbor entry belongs. The vpn-instance-name argument represents the VPN instance name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, this command configures a static neighbor entry for the public network.

Usage guidelines

A neighbor entry stores information about a link-local node. The entry can be created dynamically through NS and NA messages, or configured statically.

The device uniquely identifies a static neighbor entry by the neighbor's IPv6 address and the local Layer 3 interface number. You can configure a static neighbor entry by using either of the following methods:

· Method 1—Associate a neighbor IPv6 address and link-layer address with the Layer 3 interface of the local node.

· Method 2—Associate a neighbor IPv6 address and link-layer address with a Layer 2 port in a VLAN containing the local node.

You can use either of the previous configuration methods to configure a static neighbor entry for a VLAN interface.

· If Method 1 is used, the neighbor entry is in INCMP state. After the device obtains the corresponding Layer 2 port information, the neighbor entry goes into REACH state.

· If Method 2 is used, the port specified by port-type port-number must belong to the VLAN specified by vlan-id and the corresponding VLAN interface must already exist. After the static neighbor entry is configured, the device associates the VLAN interface with the IPv6 address to uniquely identify the static neighbor entry. The entry will be in REACH state.

To delete a static neighbor entry for a VLAN interface, specify only the corresponding VLAN interface.

Examples

# Configure a static neighbor entry for VLAN-interface 1.

<Sysname> system-view

[Sysname] ipv6 neighbor 2000::1 fe-e0-89 interface Vlan-interface 1

Related commands

display ipv6 neighbors

reset ipv6 neighbors

ipv6 neighbor link-local minimize

Use ipv6 neighbor link-local minimize to minimize link-local ND entries.

Use undo ipv6 neighbor link-local minimize to restore the default.

Syntax

ipv6 neighbor link-local minimize

undo ipv6 neighbor link-local minimize

Default

All ND entries are assigned to the driver.

Views

System view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

Perform this command to minimize link-local ND entries assigned to the driver. Link-local ND entries refer to ND entries that contain link-local addresses.

With this feature enabled, the device does not add newly learned link-local ND entries whose link local addresses are not the next hop of any route to the driver. This saves driver resources.

This feature affects only newly learned link-local ND entries rather than existing ND entries.

Examples

# Minimize link-local ND entries.

<Sysname> system-view

[Sysname] ipv6 neighbor link-local minimize

ipv6 neighbor stale-aging

Use ipv6 neighbor stale-aging to set the aging timer for ND entries in stale state.

Use undo ipv6 neighbor stale-aging to restore the default.

Syntax

ipv6 neighbor stale-aging aging-time

undo ipv6 neighbor stale-aging

Default

The aging timer for ND entries in stale state is 240 minutes.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

aging-time: Specifies the aging timer for ND entries in stale state, in the range of 1 to 1440 minutes.

Usage guidelines

This aging time applies to all ND entries in stale state. If an ND entry in stale state is not updated before the timer expires, it moves to the delay state. If it is still not updated in 5 seconds, the ND entry moves to the probe state. The device sends an NS message for detection a maximum of three times. If no response is received, the device deletes the ND entry.

Examples

# Set the aging timer for ND entries in stale state to 120 minutes.

<Sysname> system-view

[Sysname] ipv6 neighbor stale-aging 120

ipv6 neighbors max-learning-num

Use ipv6 neighbors max-learning-num to set the maximum number of dynamic neighbor entries that an interface can learn. This prevents the interface from occupying too many neighbor table resources.

Use undo ipv6 neighbors max-learning-num to restore the default.

Syntax

ipv6 neighbors max-learning-num max-number

undo ipv6 neighbors max-learning-num

Default

The maximum number of dynamic neighbor entries that an interface can learn equals the maximum free space of the neighbor table.

Views

Layer 2/Layer 3 interface view

Layer 2/Layer 3 aggregate interface view

S-channel interface/S-channel aggregate interface view

Predefined user roles

network-admin

mdc-admin

Parameters

max-number: Specifies the maximum number of dynamic neighbor entries that an interface can learn. The value range for this argument is 1 to 131072.

Usage guidelines

The device can dynamically acquire the link-layer address of a neighboring node through NS and NA messages and add it into the neighbor table.

When the number of dynamic neighbor entries reaches the threshold, the interface stops learning neighbor information.

Examples

# Set the maximum number of dynamic neighbor entries that VLAN-interface 100 can learn to 10.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] ipv6 neighbors max-learning-num 10

ipv6 pathmtu

Use ipv6 pathmtu to set a static Path MTU for an IPv6 address.

Use undo ipv6 pathmtu to delete the Path MTU configuration for an IPv6 address.

Syntax

ipv6 pathmtu [ vpn-instance vpn-instance-name ] ipv6-address value

undo ipv6 pathmtu [ vpn-instance vpn-instance-name ] ipv6-address

Default

No static Path MTU is set.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance to which the Path MTU belongs. The vpn-instance-name argument represents the VPN instance name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, this command sets the Path MTU for the public network.

ipv6-address: Specifies an IPv6 address.

value: Specifies the Path MTU of the specified IPv6 address, in the range of 1280 to 10240 bytes.

Usage guidelines

You can set a static Path MTU for a destination IPv6 address. When a source host sends a packet through an interface, it compares the interface MTU with the static Path MTU of the specified destination IPv6 address. If the packet size is larger than the smaller one of the two values, the host fragments the packet according to the smaller value.

Examples

# Set a static Path MTU for an IPv6 address.

<Sysname> system-view

[Sysname] ipv6 pathmtu fe80::12 1300

Related commands

display ipv6 pathmtu

reset ipv6 pathmtu

ipv6 pathmtu age

Use ipv6 pathmtu age to set the aging time for a dynamic Path MTU.

Use undo ipv6 pathmtu age to restore the default.

Syntax

ipv6 pathmtu age age-time

undo ipv6 pathmtu age

Default

The aging time for dynamic Path MTU is 10 minutes.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

age-time: Specifies the aging time for Path MTU in minutes, in the range of 10 to 100.

Usage guidelines

After the path MTU from a source host to a destination host is dynamically determined, the source host sends subsequent packets to the destination host based on this MTU. After the aging time expires, the following events occur:

· The dynamic Path MTU is removed.

· The source host determines a dynamic path MTU through the Path MTU mechanism again.

The aging time is invalid for a static Path MTU.

Examples

# Set the aging time for a dynamic Path MTU to 40 minutes.

<Sysname> system-view

[Sysname] ipv6 pathmtu age 40

Related commands

display ipv6 pathmtu

ipv6 prefer temporary-address

Use ipv6 prefer temporary-address to enable the system to preferentially use the temporary IPv6 address of the sending interface as the source address of a packet.

Use undo ipv6 prefer temporary-address to disable the system to preferentially use the temporary IPv6 address of the sending interface as the source address of a packet.

Syntax

ipv6 prefer temporary-address

undo ipv6 prefer temporary-address

Default

The system is disabled to preferentially use the temporary IPv6 address of the sending interface as the source address of a packet.

Views

System view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

The temporary address feature enables the system to generate and preferentially use the temporary IPv6 address of the sending interface as the source address of a packet. If the temporary IPv6 address cannot be used because of a DAD conflict, the system uses the public IPv6 address.

Examples

# Enable the system to preferentially use the temporary IPv6 address of the sending interface as the source address of the packet.

<Sysname> system-view

[Sysname] ipv6 prefer temporary-address

Related commands

ipv6 address auto

ipv6 nd ra prefix

ipv6 temporary-address

ipv6 prefix

Use ipv6 prefix to configure a static IPv6 prefix.

Use undo ipv6 prefix to delete a static IPv6 prefix.

Syntax

ipv6 prefix prefix-number ipv6-prefix/prefix-length

undo ipv6 prefix prefix-number

Default

No static IPv6 prefixes exist.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

prefix-number: Specifies a prefix ID in the range of 1 to 1024.

ipv6-prefix/prefix-length: Specifies a prefix and its length. The value range for the prefix-length argument is 1 to 128.

Usage guidelines

To modify an existing static prefix, execute the undo ipv6 prefix command to delete the existing static prefix, and then execute the ipv6 prefix command.

Dynamic IPv6 prefixes obtained from DHCPv6 servers cannot be manually removed or modified.

A static IPv6 prefix can have the same prefix ID with a dynamic IPv6 prefix, but the static one takes precedence over the dynamic one.

Examples

# Create static IPv6 prefix 2001:0410::/32 with prefix ID 1.

<Sysname> system-view

[Sysname] ipv6 prefix 1 2001:0410::/32

Related commands

display ipv6 prefix

ipv6 reassemble local enable

Use ipv6 reassemble local enable to enable IPv6 local fragment reassembly.

Use undo ipv6 reassemble local enable to disable IPv6 local fragment reassembly.

Syntax

ipv6 reassemble local enable

undo ipv6 reassemble local enable

Default

IPv6 local fragment reassembly is disabled.

Views

System view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

Configure this command on a device to improve fragment reassembly efficiency. The command enables the LPU to reassemble the IPv6 fragments of a packet if all the fragments arrive at it. If this feature is disabled, all IPv6 fragments are delivered to the active MPU for reassembly. The command applies only to fragments destined for the same LPU.

Examples

# Enable IPv6 local fragment reassembly.

<Sysname> system-view

[Sysname] ipv6 reassemble local enable

ipv6 redirects enable

Use ipv6 redirects enable to enable sending ICMPv6 redirect messages.

Use undo ipv6 redirects enable to disable sending ICMPv6 redirect messages.

Syntax

ipv6 redirects enable

undo ipv6 redirects enable

Default

Sending ICMPv6 redirect messages is disabled.

Views

System view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

The default gateway sends an ICMPv6 redirect message to the source of an IPv6 packet to inform the source of a better first hop.

Sending ICMPv6 redirect messages enables hosts that hold few routes to establish routing tables and find the best route. Because this feature adds host routes into the routing tables, host performance degrades when there are too many host routes. As a result, sending ICMPv6 redirect messages is disabled by default.

Examples

# Enable sending ICMPv6 redirect messages.

<Sysname> system-view

[Sysname] ipv6 redirects enable

ipv6 temporary-address

Use ipv6 temporary-address to enable the temporary IPv6 address feature.

Use undo ipv6 temporary-address to restore the default.

Syntax

ipv6 temporary-address [ valid-lifetime preferred-lifetime ]

undo ipv6 temporary-address

Default

The system does not generate any temporary IPv6 address.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

valid-lifetime: Specifies the valid lifetime for temporary IPv6 addresses, in the range of 600 to 4294967295 seconds. The default valid lifetime is 604800 seconds (7 days).

preferred-lifetime: Specifies the preferred lifetime for temporary IPv6 addresses, in the range of 600 to 4294967295 seconds. The default preferred lifetime is 86400 seconds (1 day).

Usage guidelines

You must enable stateless autoconfiguration before enabling the temporary address feature.

The valid lifetime for temporary IPv6 addresses must be greater than or equal to the preferred lifetime for temporary IPv6 addresses.

In stateless address autoconfiguration, an interface automatically generates an IPv6 global unicast address by using the address prefix in the received RA message and the interface ID. On an IEEE 802 interface (such as an Ethernet interface or a VLAN interface), the interface ID is generated based on the interface's MAC address and is globally unique. An attacker can exploit this rule to easily identify the sending device.

To fix the vulnerability, you can enable the temporary address feature. An IEEE 802 interface generates the following addresses:

· Public IPv6 address—Includes an address prefix in the RA message and a fixed interface ID generated based on the interface's MAC address.

· Temporary IPv6 address—Includes an address prefix in the RA message and a random interface ID generated through MD5.

When the valid lifetime of a temporary IPv6 address expires, the system deletes the address and generates a new one. This enables the system to send packets with different source addresses through the same interface. The preferred lifetime and valid lifetime for a temporary IPv6 address are determined as follows:

· The preferred lifetime of a temporary IPv6 address takes the smaller of the following values:

¡ The preferred lifetime of the address prefix in the RA message.

¡ The preferred lifetime configured for temporary IPv6 addresses minus DESYNC_FACTOR (a random number in the range of 0 to 600 seconds).

· The valid lifetime of a temporary IPv6 address takes the smaller of the following values:

¡ The valid lifetime of the address prefix.

¡ The valid lifetime configured for temporary IPv6 addresses.

Examples

# Enable the system to generate a temporary IPv6 address.

<Sysname> system-view

[Sysname] ipv6 temporary-address

Related commands

ipv6 address auto

ipv6 nd ra prefix

ipv6 prefer temporary-address

ipv6 unreachables enable

Use ipv6 unreachables enable to enable sending ICMPv6 destination unreachable messages.

Use undo ipv6 unreachables to disable sending ICMPv6 destination unreachable messages.

Syntax

ipv6 unreachables enable

undo ipv6 unreachables enable

Default

Sending ICMPv6 destination unreachable messages is disabled.

Views

System view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

If the device fails to forward a received IPv6 packet because of a destination unreachable error, it performs the following operations:

· Drops the packet.

· Sends an ICMPv6 destination unreachable message to the source.

If the device is generating ICMPv6 destination unreachable messages incorrectly, disable sending ICMPv6 destination unreachable messages to prevent attack risks.

Examples

# Enable sending ICMPv6 destination unreachable messages.

<Sysname> system-view

[Sysname] ipv6 unreachables enable

local-proxy-nd enable

Use local-proxy-nd enable to enable local ND proxy.

Use undo local-proxy-nd enable to disable local ND proxy.

Syntax

local-proxy-nd enable

undo local-proxy-nd enable

Default

Local ND proxy is disabled.

Views

VLAN interface view

Layer 3 Ethernet interface view

Layer 3 Ethernet subinterface view

Predefined user roles

network-admin

mdc-admin

Examples

# Enable local ND proxy on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] local-proxy-nd enable

Related commands

proxy-nd enable

Use proxy-nd enable to enable common ND proxy.

Use undo proxy-nd enable to disable common ND proxy.

Syntax

proxy-nd enable

undo proxy-nd enable

Default

Common ND proxy is disabled.

Views

VLAN interface view

Layer 3 Ethernet interface view

Layer 3 Ethernet subinterface view

Predefined user roles

network-admin

mdc-admin

Examples

# Enable common ND proxy on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] proxy-nd enable

Related commands

local-proxy-nd enable

reset ipv6 nd snooping

Use reset ipv6 nd snooping to clear ND snooping entries.

Syntax

reset ipv6 nd snooping [ [ vlan vlan-id ] [ global | link-local ] | vlan vlan-id ipv6-address ]

Views

User view

Predefined user roles

network-admin

mdc-admin

Parameters

ipv6-address: Clears ND snooping entries for the specified IPv6 address.

vlan vlan-id: Clears ND snooping entries for the specified VLAN. The value range for the VLAN ID is 1 to 4094.

global: Clears ND snooping entries for global unicast addresses.

link-local: Clears ND snooping entries for link-local addresses.

Usage guidelines

If no option is specified, this command clears all ND snooping entries.

Examples

# Clear all ND snooping entries.

<Sysname> reset ipv6 nd snooping

reset ipv6 neighbors

Use reset ipv6 neighbors to clear IPv6 neighbor information.

Syntax

In standalone mode:

reset ipv6 neighbors { all | dynamic | interface interface-type interface-number | slot slot-number | static }

In IRF mode:

reset ipv6 neighbors { all | dynamic | interface interface-type interface-number | chassis chassis-number slot slot-number | static }

Views

User view

Predefined user roles

network-admin

mdc-admin

Parameters

all: Clears static and dynamic neighbor information for all interfaces.

dynamic: Clears dynamic neighbor information for all interfaces.

interface interface-type interface-number: Clears dynamic neighbor information for the interface specified by its type and number.

slot slot-number: Specifies a card by its slot number. If you do not specify a cad, this command clears dynamic neighbor information for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command clears dynamic neighbor information for all cards if you do not specify a card. On an IRF 3 system, this command clears dynamic neighbor information for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

static: Clears static neighbor information for all interfaces.

Examples

# Clear neighbor information for all interfaces.

<Sysname> reset ipv6 neighbors all

This will delete all the entries. Continue? [Y/N]:Y

# Clear dynamic neighbor information for all interfaces.

<Sysname> reset ipv6 neighbors dynamic

This will delete all the dynamic entries. Continue? [Y/N]:Y

# Clear all neighbor information for Ten-GigabitEthernet 1/0/1.

<Sysname> reset ipv6 neighbors interface ten-gigabitethernet 1/0/1

This will delete all the dynamic entries by the interface you specified. Contin

ue? [Y/N]:Y

Related commands

display ipv6 neighbors

ipv6 neighbor

reset ipv6 pathmtu

Use reset ipv6 pathmtu to clear the Path MTU information.

Syntax

reset ipv6 pathmtu { all | dynamic | static }

Views

User view

Predefined user roles

network-admin

mdc-admin

Parameters

all: Clears all Path MTUs.

dynamic: Clears all dynamic Path MTUs.

static: Clears all static Path MTUs.

Examples

# Clear all Path MTUs.

<Sysname> reset ipv6 pathmtu all

Related commands

display ipv6 pathmtu

reset ipv6 statistics

Use reset ipv6 statistics to clear IPv6 and ICMPv6 packet statistics.

Syntax

In standalone mode:

reset ipv6 statistics [ slot slot-number ]

In IRF mode:

reset ipv6 statistics [ chassis chassis-number slot slot-number ]

Views

User view

Predefined user roles

network-admin

mdc-admin

Parameters

slot slot-number: Specifies a card by its slot number. If you do not specify a cad, this command clears IPv6 and ICMPv6 packet statistics for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number argument represents the slot number of the card or PEX. On an IRF fabric, this command clears IPv6 and ICMPv6 packet statistics for all cards if you do not specify a card. On an IRF 3 system, this command clears IPv6 and ICMPv6 packet statistics for all cards and PEXs if you do not specify a card or PEX. (In IRF mode.)

Examples

# Clear IPv6 and ICMPv6 packet statistics.

<Sysname> reset ipv6 statistics

Related commands

display ipv6 statistics

05-Layer 3 - IP Services Command Reference

display ipv6 icmp statistics

display ipv6 interface

display ipv6 interface prefix

ipv6 address

ipv6 icmpv6 multicast-echo-reply enable

ipv6 nd mode uni

ipv6 nd ns retrans-timer

ipv6 nd ra halt

ipv6 nd ra interval

ipv6 nd router-preference

ipv6 nd snooping enable link-local

ipv6 neighbors max-learning-num

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