04-Layer 3-IP Services Command Reference

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02-IP addressing commands
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IP addressing commands

display ip interface

Use display ip interface to display IP configuration and statistics for Layer 3 interfaces.

Syntax

display ip interface [ interface-type [ interface-number ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

interface-type: Specifies an interface by its type.

interface-number: Specifies an interface by its number.

Usage guidelines

Use the display ip interface command to display IP configuration and statistics for the specified Layer 3 interface. The statistics include the following information:

·     The number of unicast packets, bytes, and multicast packets the interface has sent and received.

·     The number of TTL-invalid packets and ICMP packets the interface has received.

The packet statistics helps you locate a possible attack on the network.

If you specify only the interface type, this command displays IP configuration and statistics for all interfaces of this interface type. If you do not specify any optional parameters, this command displays IP configuration and statistics for all Layer 3 interfaces.

Examples

# Display IP configuration and statistics for VLAN-interface 10.

<Sysname> display ip interface vlan-interface 10

Vlan-interface10 current state : DOWN

Line protocol current state : DOWN

Internet Address is 1.1.1.1/8 Primary

Broadcast address : 1.255.255.255

The Maximum Transmit Unit : 1500 bytes

input packets : 0, bytes : 0, multicasts : 0

output packets : 0, bytes : 0, multicasts : 0

TTL invalid packet number:         0

ICMP packet input number:          0

  Echo reply:                      0

  Unreachable:                     0

  Source quench:                   0

  Routing redirect:                0

  Echo request:                    0

  Router advert:                   0

  Router solicit:                  0

  Time exceed:                     0

  IP header bad:                   0

  Timestamp request:               0

  Timestamp reply:                 0

  Information request:             0

  Information reply:               0

  Netmask request:                 0

  Netmask reply:                   0

  Unknown type:                    0

Table 1 Command output

Field

Description

current state

Physical link state of the interface:

·     Administrative DOWN—The interface has been shut down by using the shutdown command.

·     DOWN—The interface is administratively up, but its physical state is down (possibly because no physical link exists or the link has failed).

·     UP—The interface is both administratively and physically up.

Line protocol current state

Data link layer state of the interface.

·     DOWN—The data link layer protocol is down.

·     UP—The data link layer protocol is up.

·     UP (spoofing)—The data link layer protocol is up, but the link is an on-demand link or does not exist.

Internet Address

IP address of the interface and type of the address.

Possible IP address types include:

·     Primary—Manually configured primary IP address.

·     Sub—Manually configured secondary IP address. If the interface has both primary and secondary IP addresses, the primary IP address is displayed. If the interface has only secondary IP addresses, the lowest secondary IP address is displayed.

·     DHCP-Allocated—DHCP allocated IP address. For more information, see DHCP client configuration in Layer 3IP Services Configuration Guide.

·     BOOTP-AllocatedBOOTP allocated IP address. For more information, see BOOTP client configuration in Layer 3IP Services Configuration Guide.

·     Unnumbered—IP address borrowed from another interface.

·     MAD—IP address assigned to an IRF member device for MAD on the interface. For more information, see IRF configuration in Virtual Technologies Configuration Guide.

Broadcast address

Broadcast address of the subnet attached to an interface.

The Maximum Transmit Unit

MTU of the interface, in bytes.

input packets, bytes, multicasts

output packets, bytes, multicasts

All received and sent packets and bytes, and received and sent multicast packets on an interface (statistics start at the device startup).

TTL invalid packet number

Number of TTL-invalid packets received on the interface (statistics start at the device startup).

ICMP packet input number:

  Echo reply:

  Unreachable:

  Source quench:

  Routing redirect:

  Echo request:

  Router advert:

  Router solicit:

  Time exceed:

  IP header bad:

  Timestamp request:

  Timestamp reply:

  Information request:

  Information reply:

  Netmask request:

  Netmask reply:

  Unknown type:

Total number of ICMP packets received on the interface (statistics start at the device startup):

·     Echo reply packets.

·     Unreachable packets.

·     Source quench packets.

·     Routing redirect packets.

·     Echo request packets.

·     Router advertisement packets.

·     Router solicitation packets.

·     Time exceeded packets.

·     IP header bad packets.

·     Timestamp request packets.

·     Timestamp reply packets.

·     Information request packets.

·     Information reply packets.

·     Netmask request packets.

·     Netmask reply packets.

·     Unknown type packets.

 

Related commands

display ip interface brief

ip address

statistics l3-packet enable

display ip interface brief

Use display ip interface brief to display brief IP configuration for Layer 3 interfaces.

Syntax

display ip interface [ interface-type [ interface-number ] ] brief [ description ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

interface-type: Specifies an interface type. If you do not specify an interface type, this command displays brief IP configuration for all Layer 3 interfaces.

interface-number: Specifies an interface number. If you do not specify an interface number, this command displays brief IP configuration for all Layer 3 interfaces of the specified type.

description: Displays complete interface descriptions. If you do not specify this keyword, the command displays a maximum of 13 characters for each interface description. If the description is longer than 13 characters, the first 10 characters are displayed, followed by an ellipsis (...).

Usage guidelines

Information displayed by the command includes the state of the physical and link layer protocols, IP address, and interface descriptions.

Examples

# Display brief IP configuration for VLAN interfaces.

<Sysname> display ip interface vlan-interface brief

*down: administratively down

(s): spoofing  (l): loopback

Interface           Physical Protocol IP address      VPN instance Description

Vlan10              down     down     6.6.6.1         --           Link to Co...

Vlan2               down     down     7.7.7.1         vpn-first... --

# Display brief IP configuration for VLAN interfaces, including complete interface descriptions.

<Sysname> display ip interface vlan-interface brief description

*down: administratively down

(s): spoofing  (l): loopback

Interface           Physical Protocol IP address      VPN instance Description

Vlan10              down     down     6.6.6.1         --           Link to CoreR

                                                                   Outer

Vlan2               down     down     7.7.7.1         vpn-first-in --

                                                      stance

Table 2 Command output

Field

Description

*down: administratively down

The interface is 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

Interface name.

Physical

Physical state of the interface:

·     *down—The interface is 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—Both the administrative and physical states of the interface are up.

Protocol

Link layer protocol state of the interface:

·     down—The protocol state of the interface is down.

·     down(l)—The protocol state of the interface is down (loopback).

·     up—The protocol state of the interface is up.

·     up(l)—The protocol state of the interface is up (loopback).

·     up(s)—The protocol state of the interface is up (spoofing).

IP address

IP address of the interface. If no IP address is configured, this field displays hyphens (--).

VPN instance

Name of the VPN instance to which the interface belongs. This field displays a maximum of 12 characters. If the VPN instance name is longer than 12 characters, the first 9 characters are displayed, followed by an ellipsis (...). If the interface does not belong to any VPN instance, this field displays hyphens (--).

Description

Description of the interface. This field displays a maximum of 13 characters. If the description is longer than 13 characters, the first 10 characters are displayed, followed by an ellipsis (...). If no description is configured, this field displays hyphens (--).

 

Related commands

display ip interface

ip address

ip address

Use ip address to assign an IP address to the interface.

Use undo ip address to remove the IP address from the interface.

Syntax

ip address ip-address { mask-length | mask } [ sub ]

undo ip address ip-address { mask-length | mask } [ sub ]

Default

No IP address is assigned to an interface.

Views

Interface view

Predefined user roles

network-admin

Parameters

ip-address: Specifies the IP address of the interface, in dotted decimal notation.

mask-length: Specifies the subnet mask length in the range of 1 to 31. For a loopback interface, the value range is 1 to 32.

mask: Specifies the subnet mask in dotted decimal notation.

sub: Assigns a secondary IP address to the interface.

Usage guidelines

Use the command to assign a primary or secondary IP address to an interface.

An interface can have only one primary IP address. If you execute this command multiple times to specify different primary IP addresses on an interface, the most recent configuration takes effect. If the interface connects to multiple subnets, configure primary and secondary IP addresses on the interface so the subnets can communicate with each other through the interface.

You cannot assign secondary IP addresses to an interface that obtains an IP address through BOOTP, DHCP, or IP unnumbered.

If you do not specify any parameters, the undo ip address command removes all IP addresses from the interface. The undo ip address ip-address { mask | mask-length } command removes the primary IP address. The undo ip address ip-address { mask | mask-length } sub command removes a secondary IP address.

The primary and secondary IP addresses assigned to the interface can be located on the same network segment. Different interfaces on your device must reside on different network segments.

Examples

# Assign VLAN-interface 10 a primary IP address 129.12.0.1 and a secondary IP address 202.38.160.1, with subnet masks both 255.255.255.0.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] ip address 129.12.0.1 255.255.255.0

[Sysname-Vlan-interface10] ip address 202.38.160.1 255.255.255.0 sub

Related commands

display ip interface

display ip interface brief

ip address unnumbered

Use ip address unnumbered to configure the current interface as IP unnumbered to borrow an IP address from the specified interface.

Use undo ip address unnumbered to restore the default.

Syntax

ip address unnumbered interface interface-type interface-number

undo ip address unnumbered

Default

The interface does not borrow IP addresses from other interfaces.

Views

Interface view

Predefined user roles

network-admin

Parameters

interface interface-type interface-number: Specifies an interface from which the current interface can borrow an IP address.

Usage guidelines

Typically, you assign an IP address to an interface either manually or through DHCP. If the IP addresses are not enough, or the interface is used only occasionally, you can configure an interface to borrow an IP address from other interfaces. This is called IP unnumbered, and the interface borrowing the IP address is called IP unnumbered interface.

Loopback interfaces cannot borrow IP addresses of other interfaces, but other interfaces can borrow IP addresses of loopback interfaces.

Multiple interfaces can use the same unnumbered IP address. If an interface has multiple manually configured IP addresses, only the primary IP address manually configured can be borrowed.

You cannot enable a dynamic routing protocol on the interface that has no IP address configured. To enable the interface to communicate with other devices, you must configure a static route to the peer device on the interface.

Examples

# Configure VLAN-interface 10 to borrow the IP address of VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] ip address unnumbered interface vlan-interface 100