The expected bandwidth is an informational parameter used only by higher-layer protocols for calculation. You cannot adjust the actual bandwidth of an interface by using this command.

Examples

# Set the expected bandwidth of GigabitEthernet 1/0/1 to 1000 kbps.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] bandwidth 1000

# Set the expected bandwidth of GigabitEthernet 1/0/1.1 to 1000 kbps.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1.1

[Sysname-GigabitEthernet1/0/1.1] bandwidth 1000

Related commands

speed

combo enable

Use combo enable to activate the copper or fiber combo port of a combo interface.

Syntax

combo enable { auto | copper | fiber }

Default

A combo interface automatically identifies the media inserted and activates the corresponding combo port.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

auto: Automatically identifies the media inserted and activates the corresponding combo port.

copper: Activates the copper combo port. In this case, use twisted pairs to connect the port.

fiber: Activates the fiber combo port. In this case, use optical fibers to connect the port.

Usage guidelines

A combo interface is a logical interface that physically contains one fiber combo port and one copper combo port on the device panel. The two ports share one forwarding interface. As a result, they cannot work simultaneously. When you activate either port, the other port is automatically disabled. You can select to activate the copper combo port or fiber combo port.

If you execute the combo enable auto command on a combo interface, the activated combo port depends on the media inserted as follows:

· If the copper combo port does not have a twisted pair installed and the fiber combo port has a transceiver module installed, the fiber combo port is activated.

· If the copper combo port has a twisted pair installed and is up, the copper combo port is still activated even after you install a transceiver module in the fiber combo port. After the device is rebooted, the fiber combo port is activated.

· If the copper combo port has a twisted pair installed and is down, the fiber combo port is activated after you install a transceiver module in the fiber combo port.

· If the fiber combo port has a transceiver module installed and then the copper combo port has a twisted pair installed, the fiber combo port is activated.

If you execute the combo enable auto command on a combo interface and the combo interface is connected to cables or optical fibers, you can use the display interface command to display the interface information.

· If the display interface command output includes "Media type is twisted pair," the copper combo port is activated.

· If the display interface command output does not include "Media type is twisted pair," the fiber combo port is activated.

Before using this command, perform the following tasks according to the marks on the device panel:

· Determine the combo interfaces on your device.

· Identify the two physical interfaces that belong to each combo interface.

Examples

# Activate the copper combo port of combo interface GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] combo enable copper

# Activate the fiber combo port of combo interface GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] combo enable fiber

dampening

Use dampening to enable the device to dampen an interface when the interface is flapping.

Use undo dampening to restore the default.

Syntax

dampening [ half-life reuse suppress max-suppress-time ]

undo dampening

Default

Interface dampening is disabled on Ethernet interfaces.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

half-life: Specifies the amount of time after which a penalty is decreased, in the range of 1 to 120 seconds. The default value is 54 seconds.

reuse: Specifies the reuse threshold in the range of 200 to 20000. The default value is 750. The reuse threshold must be less than the suppression threshold.

suppress: Specifies the suppression threshold in the range of 200 to 20000. The default value is 2000.

max-suppress-time: Specifies the maximum amount of time the interface can be dampened, in the range of 1 to 255 seconds. The default value is 162 seconds (three times the half-life timer).

Usage guidelines

This command and the link-delay command cannot be both configured on an interface.

This command does not take effect on the administratively down events. When you execute the shutdown command, the penalty restores to 0, and the interface reports the down event to the higher layer protocols.

Do not enable the dampening function on an interface with RRPP, MSTP, or Smart Link enabled.

After an interface in down state is dampened, the interface state displayed through the display interface command, MIB, or Web is always down.

Examples

# Enable interface dampening on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] dampening

# Enable interface dampening on GigabitEthernet 1/0/1, and set the following parameters:

· Half life time to 2 seconds.

· Reuse value to 800.

· Suppression threshold to 3000.

· Maximum suppression interval to 5 seconds.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] dampening 2 800 3000 5

Related commands

display interface

link-delay

default

Use default to restore the default settings for an interface.

Syntax

default

Views

Ethernet interface view

Ethernet subinterface view

Predefined user roles

network-admin

Usage guidelines

CAUTION:

The default command might interrupt ongoing network services. Make sure you are fully aware of the impacts of this command when you use it in a live network.

This command might fail to restore the default settings for some commands because of command dependencies or system restrictions. You can use the display this command in interface view to identify these commands, and use their undo forms or follow the command reference to restore their default settings. If your restoration attempt still fails, follow the error message instructions to solve the problem.

Examples

# Restore the default settings for GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] default

# Restore the default settings for GigabitEthernet 1/0/1.1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1.1

[Sysname-GigabitEthernet1/0/1.1] default

description

Use description to configure the description of an interface.

Use undo description to restore the default.

Syntax

description text

undo description

Default

The description of an interface is the interface name plus Interface (for example, GigabitEthernet1/0/1 Interface).

Views

Ethernet interface view

Ethernet subinterface view

Predefined user roles

network-admin

Parameters

text: Specifies the interface description, a case-sensitive string of 1 to 255 characters.

Examples

# Set the description of GigabitEthernet 1/0/1 to lan-interface.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] description lan-interface

# Set the description of GigabitEthernet 1/0/1.1 to subinterface1/0/1.1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1.1

[Sysname-GigabitEthernet1/0/1.1] description subinterface1/0/1.1

display counters

Use display counters to display interface traffic statistics.

Syntax

display counters { inbound | outbound } interface [ interface-type [ interface-number | interface-number.subnumber ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

inbound: Displays inbound traffic statistics.

outbound: Displays outbound traffic statistics.

interface-type: Specifies an interface type.

interface-number: Specifies an interface number.

interface-number.subnumber: Specifies a subinterface number. The interface-number argument is an interface number. The subnumber argument is the number of a subinterface created under the interface. The value range for the subnumber argument is 1 to 4094.

Usage guidelines

This command displays traffic statistics within a statistics polling interval specified by using the flow-interval command.

To clear the Ethernet interface traffic statistics, use the reset counters interface command.

If you do not specify an interface type, this command displays traffic statistics for all interfaces that have traffic counters.

If you specify an interface type but do not specify an interface number or subinterface number, this command displays traffic statistics for all interfaces of the specified type.

If you specify an interface type and an interface or subinterface number, this command displays traffic statistics for the specified interface or subinterface.

Examples

# Display inbound traffic statistics for all interfaces.

<Sysname> display counters inbound interface

Interface Total (pkts) Broadcast (pkts) Multicast (pkts) Err (pkts)

GE1/0/1 100 100 0 0

GE1/0/2 Overflow Overflow Overflow Overflow

Overflow: More than 14 digits (7 digits for column "Err").

--: Not supported.

Table 1 Command output

Field	Description
Interface	Abbreviated interface name.
Total (pkts)	Total number of packets received or sent through the interface.
Broadcast (pkts)	Total number of broadcast packets received or sent through the interface.
Multicast (pkts)	Total number of multicast packets received or sent through the interface.
Err (pkts)	Total number of error packets received or sent through the interface.
Overflow: More than 14 digits (7 digits for column "Err")	The command displays Overflow when any of the following conditions exist: · The data length of an Err field value is greater than 7 decimal digits. · The data length of a non-Err field value is greater than 14 decimal digits.
--: Not supported	The statistical item is not supported.

Related commands

flow-interval

reset counters interface

display counters rate

Use display counters rate to display traffic rate statistics for interfaces in up state for the most recent statistics polling interval.

Syntax

display counters rate { inbound | outbound } interface [ interface-type [ interface-number | interface-number.subnumber ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

inbound: Displays inbound traffic rate statistics.

outbound: Displays outbound traffic rate statistics.

interface-type: Specifies an interface type.

interface-number: Specifies an interface number.

Usage guidelines

If you do not specify an interface type, this command displays traffic rate statistics for all up interfaces that have traffic counters.

If you specify an interface type but do not specify an interface number or subinterface number, this command displays traffic rate statistics for all up interfaces of the specified type.

If you specify an interface type and an interface or subinterface number, this command displays traffic rate statistics for the specified interface or subinterface.

If an interface that you specify is always down for the most recent statistics polling interval, the system prompts that the interface does not support the command.

To set the statistics polling interval, use the flow-interval command.

Examples

# Display the inbound traffic rate statistics for all interfaces.

<Sysname> display counters rate inbound interface

Usage: Bandwidth utilization in percentage

Interface Usage (%) Total (pps) Broadcast (pps) Multicast (pps)

GE1/0/1 3 -- -- --

Overflow: More than 14 digits.

--: Not supported.

Table 2 Command output

Field	Description
Interface	Abbreviated interface name.
Usage (%)	Bandwidth usage (in percentage) of the interface for the last statistics polling interval.
Total (pkts/sec)	Average receiving or sending rate (in pps) for unicast packets for the last statistics polling interval.
Broadcast (pkts/sec)	Average receiving or sending rate (in pps) for broadcast packets for the last statistics polling interval.
Multicast (pkts/sec)	Average receiving or sending rate (in pps) for multicast packets for the last statistics polling interval. .
Overflow: more than 14 decimal digits	The command displays Overflow if the data length of a statistical item is greater than 14 decimal digits.
--: not supported	The statistical item is not supported.

Related commands

flow-interval

reset counters interface

display ethernet statistics

Use display ethernet statistics to display the Ethernet module statistics.

Syntax

display ethernet statistics slot slot-number

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

slot slot-number: Specifies an IRF member device by its member ID.

Examples

# Display the Ethernet module statistics for the specified slot.

<Sysname> display ethernet statistics slot 1

ETH receive packet statistics:

Totalnum : 10447 ETHIINum : 4459

SNAPNum : 0 RAWNum : 0

LLCNum : 0 UnknownNum : 0

ForwardNum : 4459 ARP : 0

MPLS : 0 ISIS : 0

ISIS2 : 0 IP : 0

IPV6 : 0

ETH receive error statistics:

NullPoint : 0 ErrIfindex : 0

ErrIfcb : 0 IfShut : 0

ErrAnalyse : 5988 ErrSrcMAC : 5988

ErrHdrLen : 0

ETH send packet statistics:

L3OutNum : 211 VLANOutNum : 0

FastOutNum : 155 L2OutNum : 0

ETH send error statistics:

MbufRelayNum : 0 NullMbuf : 0

ErrAdjFwd : 0 ErrPrepend : 0

ErrHdrLen : 0 ErrPad : 0

ErrQoSTrs : 0 ErrVLANTrs : 0

ErrEncap : 0 ErrTagVLAN : 0

IfShut : 0 IfErr : 0

Table 3 Output description

Field	Description
ETH receive packet statistics	Statistics about the Ethernet packets received by the Ethernet module: · Totalnum—Total number of received packets. · ETHIINum—Number of packets encapsulated by using Ethernet II. · SNAPNum—Number of packets encapsulated by using SNAP. · RAWNum—Number of packets encapsulated by using RAW. · LLCNum—Number of packets encapsulated by using LLC. · UnknownNum—Number of packets encapsulated by using unknown methods. · ForwardNum—Number of packets forwarded at Layer 2 or sent to the CPU. · ARP—Number of ARP packets. · MPLS—Number of MPLS packets. This field is not supported in the current software version. · ISIS—Number of IS-IS packets. · ISIS2—Number of large 802.3/802.2 frames encapsulated by using IS-IS. · IP—Number of IP packets. · IPv6—Number of IPv6 packets.‌
ETH receive error statistics	Statistics about the error Ethernet packets in the inbound direction on the Ethernet module. Errors might be included in packets or occur during the receiving process. The items include: · NullPoint—Number of packets that include null pointers. · ErrIfindex—Number of packets that include incorrect interface indexes. · ErrIfcb—Number of packets that include incorrect interface control blocks. · IfShut—Number of packets that are being received when the interface is shut down. · ErrAnalyse—Number of packets that include packet parsing errors. · ErrSrcMAC—Number of packets that include incorrect source MAC addresses. · ErrHdrLen—Number of packets that include header length errors.
ETH send packet statistics	Statistics about the Ethernet packets sent by the Ethernet module: · L3OutNum—Number of packets sent out of Layer 3 Ethernet interfaces. · VLANOutNum—Number of packets sent out of VLAN interfaces. · FastOutNum—Number of packets fast forwarded. · L2OutNum—Number of packets sent out of Layer 2 Ethernet interfaces. · MbufRelayNum—Number of packets transparently sent.
ETH send error statistics	Statistics about the error Ethernet packets in the outbound direction on the Ethernet module: · NullMbuf—Number of packets with null pointers. · ErrAdjFwd—Number of packets with adjacency table errors. · ErrPrepend—Number of packets with extension errors. · ErrHdrLen—Number of packets with header length errors. · ErrPad—Number of packets with padding errors. · ErrQoSTrs—Number of packets that failed to be sent by QoS. · ErrVLANTrs—Number of packets that failed to be sent in VLANs. · ErrEncap—Number of packets that failed to be sent due to link header encapsulation failures. · ErrTagVLAN—Number of packets that failed to be sent due to VLAN tag encapsulation failures. · IfShut—Number of packets that are being sent when the interface is shut down. · IfErr—Number of packets with incorrect outgoing interfaces.

Related commands

reset ethernet statistics

display interface

Use display interface to display interface information.

Syntax

display interface [ interface-type [ interface-number | interface-number.subnumber ] ] [ brief [ description | down ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

interface-type: Specifies an interface type.

interface-number: Specifies an interface number.

brief: Displays brief interface information. If you do not specify this keyword, the command displays detailed interface information.

description: Displays complete interface descriptions. If you do not specify this keyword, the command displays only the first 27 characters of each interface description.

down: Displays information about interfaces in down state and the causes. If you do not specify this keyword, the command displays information about interfaces in all states.

Usage guidelines

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

If you specify an interface type but do not specify an interface number or subinterface number, this command displays information about all interfaces of the specified type.

Examples

# Display information about Layer 3 interface GigabitEthernet 1/0/1.

<Sysname> display interface gigabitethernet 1/0/1

GigabitEthernet1/0/1

Current state: Administratively DOWN

Line protocol state: DOWN

Description: GigabitEthernet1/0/1 Interface

Bandwidth: 1000000 kbps

Maximum transmission unit: 1500

Allow jumbo frames to pass

Broadcast max-ratio: 100%

Multicast max-ratio: 100%

Unicast max-ratio: 100%

Internet protocol processing: Disabled

IP packet frame type: Ethernet II, hardware address: 3822-d666-bd0c

IPv6 packet frame type: Ethernet II, hardware address: 3822-d666-bd0c

Media type is twisted pair

port hardware type is 1000_BASE_T

Port priority: 2

Unknown-speed mode, unknown-duplex mode

Link speed type is autonegotiation, link duplex type is autonegotiation

Flow-control is not enabled

The Maximum Frame Length is 12288

Last link flapping: 6 hours 39 minutes 28 seconds

Last clearing of counters: Never

Peak input rate: 0 bytes/sec, at 2013-07-07 16:07:11

Peak output rate: 0 bytes/sec, at 2013-07-07 16:07:11

Last 300 second input: 0 packets/sec 0 bytes/sec 0%

Last 300 second output: 0 packets/sec 0 bytes/sec 0%

Input (total): 0 packets, 0 bytes

0 unicasts, 0 broadcasts, 0 multicasts, - pauses

Input (normal): 0 packets, 0 bytes

0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses

Input: 0 input errors, 0 runts, 0 giants, 0 throttles

0 CRC, 0 frame, 0 overruns, - aborts

- ignored, - parity errors

Output (total): 0 packets, 0 bytes

0 unicasts, 0 broadcasts, 0 multicasts, - pauses

Output (normal): 0 packets, 0 bytes

0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses

Output: 0 output errors, - underruns, - buffer failures

0 aborts, 0 deferred, 0 collisions, 0 late collisions

- lost carrier, - no carrier

# Display detailed information about Layer 2 interface GigabitEthernet 1/0/1.

<Sysname> display interface gigabitethernet 1/0/1

GigabitEthernet1/0/1

Current state: DOWN

Line protocol state: DOWN

IP packet frame type: Ethernet II, hardware address: 000c-2963-b767

Description: GigabitEthernet1/0/1 Interface

Bandwidth: 100000 kbps

Loopback is not set

Media type is twisted pair

port hardware type is 1000_BASE_T_AN_SFP

Unknown-speed mode, unknown-duplex mode

Link speed type is autonegotiation, link duplex type is autonegotiation

Flow-control is not enabled

Maximum frame length: 9216

Allow jumbo frame to pass

Broadcast max-ratio: 100%

Multicast max-ratio: 100%

Unicast max-ratio: 100%

PVID: 1

MDI type: Automdix

Port link-type: Access

Tagged VLANs: None

UnTagged VLANs: 1

Port priority: 2

Last link flapping: 6 hours 39 minutes 25 seconds

Last clearing of counters: 14:34:09 Tue 11/01/2011

Peak input rate: 0 bytes/sec, at 2013-07-17 22:06:19

Peak output rate: 0 bytes/sec, at 2013-07-17 22:06:19

Last 300 second input: 0 packets/sec 0 bytes/sec -%

Last 300 second output: 0 packets/sec 0 bytes/sec -%

Input (total): 0 packets, 0 bytes

0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses

Input (normal): 0 packets, 0 bytes

0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses

Input: 0 input errors, 0 runts, 0 giants, 0 throttles

0 CRC, 0 frame, 0 overruns, 0 aborts

0 ignored, 0 parity errors

Output (total): 0 packets, 0 bytes

0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses

Output (normal): 0 packets, 0 bytes

0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses

Output: 0 output errors, 0 underruns, 0 buffer failures

0 aborts, 0 deferred, 0 collisions, 0 late collisions

0 lost carrier, 0 no carrier

Table 4 Command output

Field	Description
Current state	Physical link state of the interface: · Administratively 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). · DOWN ( Link-Aggregation interface down )—The aggregate interface to which the interface belongs has been shut down by using the shutdown command. · mac-address moving down—The interface has been shut down by the MAC address move suppression feature. · MAD ShutDown—The interface has been shut down by IRF MAD. This state occurs if the interface is on an IRF fabric placed in Recovery state after an IRF split. · OFP DOWN—The interface has been shut down by OpenFlow. · Storm-Constrain—The interface has been shut down because the storm control feature detected that unknown unicast traffic, multicast traffic, or broadcast traffic exceeded the upper threshold. · STP DOWN—The interface has been shut down by the BPDU guard feature. · UP—The interface is both administratively and physically up.
Line protocol state	Data link layer state of the interface. The state is determined through automatic parameter negotiation at the data link layer. · 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. This attribute is typical of null interfaces and loopback interfaces. · DOWN—The data link layer protocol is down. · DOWN (protocols)—The data link layer has been shut down by protocols included in the parentheses. Available protocols include: ¡ DLDP—Shuts down the data link layer when it detects that the link is unidirectional. ¡ OAM—Shuts down the data link layer when it detects a remote link failure. ¡ LAGG—Shuts down the data link layer when it detects that the aggregate interface does not have Selected ports. ¡ BFD—Shuts down the data link layer when it detects a link failure.
Bandwidth	Expected bandwidth of the interface.
Maximum transmission unit	MTU of the interface.
Internet protocol processing: Disabled	The interface is not assigned an IP address and cannot process IP packets.
Internet address	IP address of the interface. The primary attribute indicates that the address is the primary IP address.
IP packet frame type	IPv4 packet framing format.
hardware address	MAC address of the interface.
IPv6 packet frame type	IPv6 packet framing format.
Port priority	Port priority of the interface.
Loopback is set internal	An internal loopback test is running on the interface. This field depends on your configuration .
Loopback is set external	An external loopback test is running on the interface. This field depends on your configuration.
Loopback is not set	No loopback test is running on the interface. This field depends on your configuration.
10Mbps-speed mode	The interface is operating at 10 Mbps. This field depends on your configuration and the link parameter negotiation result.
100Mbps-speed mode	The interface is operating at 100 Mbps. This field depends on your configuration and the link parameter negotiation result.
1000Mbps-speed mode	The interface is operating at 1000 Mbps. This field depends on your configuration and the link parameter negotiation result.
10Gbps-speed mode	The interface is operating at 10 Gbps. This field depends on your configuration and the link parameter negotiation result.
Unknown-speed mode	The speed of the interface is unknown because the speed negotiation fails or the interface is physically disconnected.
half-duplex mode	The interface is operating in half duplex mode. This field depends on your configuration and the link parameter negotiation result.
full-duplex mode	The interface is operating in full duplex mode. This field depends on your configuration and the link parameter negotiation result.
unknown-duplex mode	The duplex mode of the interface is unknown because the duplex mode negotiation fails or the interface is physically disconnected.
Link speed type is autonegotiation	The interface is configured with the speed auto command.
Link speed type is force link	The interface is manually configured with a speed (for example, 1000 Mbps) by using the speed command.
link duplex type is autonegotiation	The interface is configured with the duplex auto command.
link duplex type is force link	The interface is manually configured with a duplex mode (for example, half or full) by using the duplex command.
Flow-control is not enabled	Generic flow control is disabled on the interface. This field depends on your configuration and the link parameter negotiation result.
Maximum frame length	Maximum length of Ethernet frames allowed to pass through the interface.
Allow jumbo frame to pass	The interface allows jumbo frames to pass through.
Broadcast max-	Broadcast storm suppression threshold in ratio, pps, or kbps. The unit of the threshold depends on your configuration.
Multicast max-	Multicast storm suppression threshold in ratio, pps, or kbps. The unit of the threshold depends on your configuration.
Unicast max-	Unknown unicast storm suppression threshold in ratio, pps, or kbps. The unit of the threshold depends on your configuration.
PVID	Port VLAN ID (PVID) of the interface.
MDI type	MDIX mode of the interface: · automdix. · mdi. · mdix.
Port link-type	Link type of the interface: · access. · trunk. · hybrid.
Tagged VLANs	VLANs for which the interface sends packets without removing VLAN tags.
Untagged VLANs	VLANs for which the interface sends packets after removing VLAN tags.
VLAN Passing	VLANs whose packets can be forwarded by the port. The VLANs must have been created.
VLAN permitted	VLANs whose packets are permitted by the port.
Trunk port encapsulation	Encapsulation protocol type for the trunk port.
Last link flapping	The amount of time that has elapsed since the most recent physical state change of the interface. This field displays Never if the interface has been physically down since device startup.
Last clearing of counters	Time when the reset counters interface command was last used to clear the interface statistics. This field displays Never if the reset counters interface command has never been used on the interface since device startup.
Last 300 second input: 0 packets/sec 0 bytes/sec 0% Last 300 second output: 0 packets/sec 0 bytes/sec 0%	Average inbound or outbound traffic rate (in pps and Bps) in the last 300 seconds, and the ratio of the actual rate to the interface bandwidth. A hyphen (-) indicates that the statistical item is not supported.
Input(total): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses	The two fields on the first line represent the inbound traffic statistics (in packets and bytes) for the interface. All inbound normal packets, abnormal packets, and normal pause frames were counted. The four fields on the second line represent: · Number of inbound unicast packets. · Number of inbound broadcasts. · Number of inbound multicasts. · Number of inbound pause frames. A hyphen (-) indicates that the statistical item is not supported.
Input(normal): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses	The two fields on the first line represent the inbound normal traffic and pause frame statistics (in packets and bytes) for the interface. The four fields on the second line represent: · Number of inbound normal unicast packets. · Number of inbound normal broadcasts. · Number of inbound normal multicasts. · Number of inbound normal pause frames. A hyphen (-) indicates that the statistical item is not supported.
input errors	Statistics of incoming error packets.
runts	Number of inbound frames meeting the following conditions: · Shorter than 64 bytes. · In correct format. · Containing valid CRCs.
giants	Number of inbound giants. Giants refer to frames larger than the maximum frame length supported on the interface. For an Ethernet interface that does not permit jumbo frames, the maximum frame length is as follows: · 1518 bytes (without VLAN tags). · 1522 bytes (with VLAN tags). For an Ethernet interface that permits jumbo frames, the maximum Ethernet frame length is set when you configure jumbo frame support on the interface.
throttles	Number of inbound frames that had a non-integer number of bytes.
CRC	Total number of inbound frames that had a normal length, but contained CRC errors.
frame	Total number of inbound frames that contained CRC errors and a non-integer number of bytes.
overruns	Number of packets dropped because the input rate of the port exceeded the queuing capability.
aborts	Total number of illegal inbound packets: · Fragment frames—CRC error frames shorter than 64 bytes. The length (in bytes) can be an integral or non-integral value. · Jabber frames—CRC error frames greater than the maximum frame length supported on the Ethernet interface (with an integral or non-integral length). ¡ For an Ethernet interface that does not permit jumbo frames, the maximum frame length is 1518 bytes (without VLAN tags) or 1522 bytes (with VLAN tags). ¡ For an Ethernet interface that permits jumbo frames, the maximum Ethernet frame length is set when you configure jumbo frame support on the interface. · Symbol error frames—Frames that contained a minimum of one undefined symbol. · Unknown operation code frames—Non-pause MAC control frames. · Length error frames—Frames whose 802.3 length fields did not match the actual frame length (46 to 1500 bytes).
ignored	Number of inbound frames dropped because the receiving buffer of the port ran low.
parity errors	Total number of frames with parity errors.
Output(total): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses	The two fields on the first line represent the outbound traffic statistics (in packets and bytes) for the interface. All outbound normal packets, abnormal packets, and normal pause frames were counted. The four fields on the second line represent: · Number of outbound unicast packets. · Number of outbound broadcasts. · Number of outbound multicasts. · Number of outbound pause frames. A hyphen (-) indicates that the statistical item is not supported.
Output(normal): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses	The two fields on the first line represent the outbound normal traffic and pause frame statistics (in packets and bytes) for the interface. The four fields on the second line represent: · Number of outbound normal unicast packets. · Number of outbound normal broadcasts. · Number of outbound normal multicasts. · Number of outbound normal pause frames. A hyphen (-) indicates that the statistical item is not supported.
output errors	Number of outbound packets with errors.
underruns	Number of packets dropped because the output rate of the interface exceeded the output queuing capability. This is a low-probability hardware anomaly.
buffer failures	Number of packets dropped because the transmitting buffer of the interface ran low.
aborts	Number of packets that failed to be transmitted, for example, because of Ethernet collisions.
deferred	Number of frames that the interface deferred to transmit because of detected collisions.
collisions	Number of frames that the interface stopped transmitting because Ethernet collisions were detected during transmission.
late collisions	Number of frames that the interface deferred to transmit after transmitting their first 512 bits because of detected collisions.
lost carrier	Number of carrier losses during transmission. This counter increases by one when a carrier is lost, and applies to serial WAN interfaces.
no carrier	Number of times that the port failed to detect the carrier when attempting to send frames. This counter increases by one when a port failed to detect the carrier, and applies to serial WAN interfaces.
Peak input rate	Peak rate of inbound traffic in Bps, and the time when the peak inbound traffic rate occurred.
Peak output rate	Peak rate of outbound traffic in Bps, and the time when the peak outbound traffic rate occurred.

# Display brief information about all interfaces.

<Sysname> display interface brief

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) – spoofing

Interface Link Protocol Primary IP Description

GE1/0/1 DOWN DOWN --

Loop0 UP UP(s) 2.2.2.9

NULL0 UP UP(s) --

Vlan1 UP DOWN --

Vlan999 UP UP 192.168.1.42

Brief information on interfaces in bridge mode:

Link: ADM - administratively down; Stby - standby

Speed: (a) - auto

Duplex: (a)/A - auto; H - half; F - full

Type: A - access; T - trunk; H - hybrid

Interface Link Speed Duplex Type PVID Description

GE1/0/2 DOWN auto A A 1

GE1/0/3 UP 100M(a) F(a) A 1 aaaaaaaaaaaaaaaaaaaaaaaaaaa

# Display brief information about GigabitEthernet 1/0/3, including the complete description of the interface.

<Sysname> display interface gigabitethernet 1/0/3 brief description

Brief information on interfaces in bridge mode:

Link: ADM - administratively down; Stby - standby

Speed: (a) - auto

Duplex: (a)/A - auto; H - half; F - full

Type: A - access; T - trunk; H - hybrid

Interface Link Speed Duplex Type PVID Description

GE1/0/3 UP 100M(a) F(a) A 1 aaaaaaaaaaaaaaaaaaaaaaaaaaaaa

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

# Display information about interfaces in DOWN state and the causes.

<Sysname> display interface brief down

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Interface Link Cause

GE1/0/1 DOWN Not connected

Vlan2 DOWN Not connected

Brief information on interfaces in bridge mode:

Link: ADM - administratively down; Stby - standby

Interface Link Cause

GE1/0/2 DOWN Not connected

Table 5 Command output

Field	Description
Brief information on interfaces in route mode:	Brief information about Layer 3 interfaces.
Interface	Interface name.
Link	Physical link state of the interface: · UP—The interface is physically up. · DOWN—The interface is physically down. · ADM—The interface has been shut down by using the shutdown command. To restore the physical state of the interface, use the undo shutdown command. · Stby—The interface is a backup interface in standby state.
Protocol	Data link layer protocol state of the interface: · UP—The data link layer protocol of the interface is up. · DOWN—The data link layer protocol of the interface is down. · UP(s)—The data link layer protocol of the interface is up, but the link is an on-demand link or does not exist. The (s) attribute represents the spoofing flag. This value is typical of null interfaces and loopback interfaces.
Primary IP	Primary IP address of the interface. This field displays two hyphens (--) if the interface does not have an IP address.
Description	Description of the interface.
Brief information of interfaces in bridge mode:	Brief information about Layer 2 interfaces.
Type: A - access; T - trunk; H – hybrid	Link type options for interfaces.
Speed	Speed of the interface, in bps. This field displays the (a) flag next to the speed if the speed is automatically negotiated. This field displays auto if the interface is configured to autonegotiate its speed but the autonegotiation has not started.
Duplex	Duplex mode of the interface: · A—Autonegotiation. The interface is configured to autonegotiate its duplex mode but the autonegotiation has not started. · F—Full duplex. · F(a)—Autonegotiated full duplex. · H—Half duplex. · H(a)—Autonegotiated half duplex.
Type	Link type of the interface: · A—Access. · H—Hybrid. · T—Trunk.
PVID	Port VLAN ID.
Cause	Cause for the physical link state of an interface to be DOWN: · Administratively—The interface has been manually shut down by using the shutdown command. To restore the physical state of the interface, use the undo shutdown command. · DOWN ( Link-Aggregation interface down )—The interface is a member port of an aggregate interface, and the aggregate interface is down. · DOWN (Loopback detection down)—The loopback detection module has detected loops. · DOWN ( Monitor-Link uplink down )—The monitor link module has detected that the uplink is down. · MAD ShutDown—The interface is on an IRF fabric placed by IRF MAD in Recovery state after an IRF split. · Not connected—No physical connection exists (possibly because the network cable is disconnected or faulty). · Storm-Constrain—The storm control feature has detected that unknown unicast traffic, multicast traffic, or broadcast traffic exceeded the upper threshold. · STP DOWN—The interface has been shut down by the BPDU guard feature. · Port Security Disabled—The interface has been shut down by the intrusion detection mechanism because the interface received illegal packets. · OFP DOWN—The interface has been shut down by OpenFlow. · Standby—The interface is a backup interface in standby state.

Related commands

reset counters interface

display packet-drop

Use display packet-drop to display information about packets dropped on an interface.

Syntax

display packet-drop { interface [ interface-type [ interface-number | interface-number.subnumber ] ] | summary }

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

interface-type: Specifies an interface type.

interface-number: Specifies an interface number.

summary: Displays the summary of dropped packets on all interfaces.

Usage guidelines

If you do not specify an interface type, this command displays information about dropped packets on all interfaces on the device.

If you specify an interface type but do not specify an interface number, this command displays information about dropped packets on all interfaces of the specified type.

Examples

# Display information about dropped packets on GigabitEthernet 1/0/1.

<Sysname> display packet-drop interface gigabitethernet 1/0/1

GigabitEthernet1/0/1:

Packets dropped due to full GBP or insufficient bandwidth: 301

Packets dropped due to Fast Filter Processor (FFP): 261

Packets dropped due to STP non-forwarding state: 321

# Display the summary of dropped packets on all interfaces.

<Sysname> display packet-drop summary

All interfaces:

Packets dropped due to full GBP or insufficient bandwidth: 301

Packets dropped due to Fast Filter Processor (FFP): 261

Packets dropped due to STP non-forwarding state: 321

Table 6 Command output

Field	Description
Packets dropped due to full GBP or insufficient bandwidth	Packets that are dropped because the buffer is used up or the bandwidth is insufficient.
Packets dropped due to Fast Filter Processor (FFP)	Packets that are filtered out.
Packets dropped due to STP non-forwarding state	Packets that are dropped because STP is in the non-forwarding state.

display priority-flow-control

Use display priority-flow-control to display the PFC information for an interface.

Syntax

display priority-flow-control interface [ interface-type [ interface-number ] ]

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, the command displays the PFC information for all Ethernet interfaces.

interface-number: Specifies an interface number. If you do not specify an interface number, the command displays the PFC information for all Ethernet interfaces of the specified type.

Examples

# Display the PFC information for all Ethernet interfaces.

<Sysname> display priority-flow-control interface

Interface AdminMode OperMode Dot1pList Prio Recv Send

--------------------------------------------------------------------------------

GE1/0/1 Auto Disabled 0,2-3,5-6 0 178 43

Table 7 Command output

Field	Description
Interface	Abbreviated name of the interface.
AdminMode	Administrative PFC status: · Disabled—PFC is disabled for the interface. · Auto—The interface is configured to autonegotiate the PFC status with the remote end. · Enabled—PFC is enabled for the interface.
OperMode	Operative PFC status: · Disabled—PFC is disabled. · Enabled—PFC is enabled.
Dot1pList	802.1p priorities that are enabled with PFC. 802.1p priority values 0 through 7 are available.
Prio	An 802.1p priority is displayed only when the 802.1p priority is enabled with PFC and the interface has received or sent packets with the 802.1p priority.
Recv	Number of received PFC pause frames.
Send	Number of sent PFC pause frames.

Related commands

priority-flow-control

priority-flow-control no-drop dot1p

duplex

Use duplex to set the duplex mode for an Ethernet interface.

Use undo duplex to restore the default.

Syntax

duplex { auto | full | half }

undo duplex

Default

An Ethernet interface operates in autonegotiation mode.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

auto: Configures the interface to autonegotiate the duplex mode with the peer.

full: Configures the interface to operate in full duplex mode. In this mode, the interface can receive and transmit packets simultaneously.

half: Configures the interface to operate in half duplex mode. In this mode, the interface can only receive or transmit packets at a given time.

Examples

# Configure GigabitEthernet 1/0/1 to operate in full duplex mode.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] duplex full

eee enable

Use eee enable to enable Energy Efficient Ethernet (EEE) on an interface.

Use undo eee enable to disable EEE on an interface.

Syntax

eee enable

undo eee enable

Default

EEE is disabled.

Views

Ethernet interface view

Predefined user roles

network-admin

Usage guidelines

With EEE enabled, a link-up interface enters low power state if it has not received any packet for a period of time. The time period depends on the chip specifications and is not configurable. When a packet arrives later, the interface restores to the normal state.

Examples

# Enable EEE on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] eee enable

flow-control

Use flow-control to enable TxRx-mode generic flow control on an Ethernet interface.

Use undo flow-control to disable TxRx-mode generic flow control on the Ethernet interface.

Syntax

flow-control

undo flow-control

Default

TxRx-mode generic flow control is disabled on an Ethernet interface.

Views

Ethernet interface view

Predefined user roles

network-admin

Usage guidelines

With TxRx-mode generic flow control configured, an interface can both send and receive flow control frames:

· When congested, the interface sends a flow control frame to its peer.

· Upon receiving a flow control frame from the peer, the interface suspends sending packets.

To implement flow control on a link, enable generic flow control at both ends of the link.

Examples

# Enable TxRx-mode generic flow control on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] flow-control

flow-control receive enable

Use flow-control receive enable to enable Rx-mode generic flow control on an Ethernet port.

Use undo flow-control to disable Rx-mode generic flow control on an Ethernet port.

Syntax

flow-control receive enable

undo flow-control

Default

Rx-mode generic flow control is disabled on Ethernet interfaces.

Views

Ethernet interface view

Predefined user roles

network-admin

Usage guidelines

With Rx-mode flow control enabled, an interface can receive but cannot send flow control frames.

· When the interface receives a flow control frame from its peer, it suspends sending packets to the peer.

· When traffic congestion occurs on the interface, it cannot send flow control frames to the peer.

To handle unidirectional traffic congestion on a link, configure the flow-control receive enable command at one end, and the flow-control command at the other. To enable both ends of the link to handle traffic congestion, configure the flow-control command at both ends.

Examples

# Enable Rx-mode generic flow control on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-gigabitethernet 1/0/1] flow-control receive enable

Related commands

flow-control

flow-interval

Use flow-interval to set the statistics polling interval.

Use undo flow-interval to restore the default.

Syntax

flow-interval interval

undo flow-interval

Default

The statistics polling interval is 300 seconds.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

interval: Sets the statistics polling interval in seconds. The interval is in the range of 5 to 300 and must be a multiple of 5.

Examples

# Set the statistics polling interval to 100 seconds on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] flow-interval 100

interface

Use interface to enter interface view, create a subinterface and enter its view, or enter the view of an existing subinterface.

Syntax

interface interface-type { interface-number | interface-number.subnumber }

Views

System view

Predefined user roles

network-admin

Parameters

interface-type: Specifies an interface type.

interface-number: Specifies an interface number.

Examples

# Enter the view of GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1]

# Create Ethernet subinterface GigabitEthernet 1/0/1.1 and enter its view.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1.1

[Sysname-GigabitEthernet1/0/1.1]

jumboframe enable

Use jumboframe enable to allow jumbo frames within the specified length to pass through.

Use undo jumboframe enable to prevent jumbo frames from passing through.

Syntax

jumboframe enable [ size ]

undo jumboframe enable

Default

The device allows jumbo frames within 12288 bytes to pass through.

Views

Layer 2 Ethernet interface view

Layer 3 Ethernet interface view

Predefined user roles

network-admin

Parameters

size: Sets the maximum length (in bytes) of Ethernet frames that are allowed to pass through. The value range for this argument is 1536 to 12288.

Usage guidelines

If you execute this command multiple times, the most recent configuration takes effect.

Examples

# Allow jumbo frames to pass through GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] jumboframe enable

link-delay

Use link-delay to set the physical state change suppression interval on an Ethernet interface.

Use undo link-delay to restore the default.

Syntax

link-delay [ msec ] delay-time [ mode { up | updown } ]

undo link-delay [ msec ] delay-time [ mode { up | updown } ]

Default

Each time the physical link of a port goes up or comes down, the interface immediately reports the change to the CPU.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

msec: Enables the physical state change suppression interval to be accurate to milliseconds. If you do not specify this keyword, the suppression interval is accurate to seconds.

delay-time: Sets the physical state change suppression interval on the Ethernet interface. A value of 0 means that physical state changes are immediately reported to the CPU and are not suppressed.

· If you do not specify the msec keyword, the value range is 0 to 30 seconds.

· If you specify the msec keyword, the value range is 0 to 10000 milliseconds, and the value must be a multiple of 100.

mode up: Suppresses the link-up events.

mode updown: Suppresses both the link-up and link-down events.

Usage guidelines

You can configure this feature to suppress only link-down events, only link-up events, or both. If an event of the specified type still exists when the suppression interval expires, the system reports the event.

When you configure this feature, follow these guidelines:

· To suppress only link-down events, configure the link-delay [ msec ] delay-time command.

· To suppress only link-up events, configure the link-delay [ msec ] delay-time mode up command.

· To suppress both link-down and link-up events, configure the link-delay [ msec ] delay-time mode updown command.

On an interface, you can configure different suppression intervals for link-up and link-down events. If you configure the link-delay command multiple times for link-up or link-down events, the most recent configuration takes effect.

Do not configure this command on an interface that has RRPP, spanning tree protocols, or Smart Link enabled.

This command and the dampening command cannot be both configured on an Ethernet interface.

Examples

# Set the link-down event suppression interval to 8 seconds on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] link-delay 8

# Set the link-up event suppression interval to 800 milliseconds on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] link-delay msec 800 mode up

Related commands

dampening

loopback

Use loopback to enable loopback testing on an Ethernet interface.

Syntax

loopback { external | internal }

Default

Loopback testing is disabled on an Ethernet interface.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

external: Enables external loopback testing on the Ethernet interface.

internal: Enables internal loopback testing on the Ethernet interface.

Usage guidelines

After you enable loopback testing on an Ethernet interface, the Ethernet interface switches to full duplex mode. After you disable loopback testing, the Ethernet interface restores to its duplex setting.

An Ethernet interface in a loopback test cannot correctly forward data packets.

You cannot perform a loopback test on the following Ethernet interfaces:

· Ethernet interfaces manually brought down (displayed as in ADM or Administratively DOWN state).

· Ethernet interfaces configured with the port up-mode command.

The speed, duplex, mdix-mode, and shutdown commands cannot be configured on an Ethernet interface in a loopback test.

An Ethernet interface in a loopback test operates full duplex mode. The duplex mode is restored to the original configuration after the loopback test is complete.

Examples

# Enable internal loopback testing on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] loopback internal

port auto-power-down

Use port auto-power-down to enable auto power-down on an Ethernet interface.

Use undo port auto-power-down to disable auto power-down on an Ethernet interface.

Syntax

port auto-power-down

undo port auto-power-down

Default

Auto power-down is disabled on Ethernet interfaces.

Views

Ethernet interface view

Predefined user roles

network-admin

Usage guidelines

When an interface with auto power-down enabled has been down for a specific period of time, both of the following events occur:

· The device automatically stops supplying power to the interface.

· The interface enters the power save mode.

The time period depends on the chip specifications and is not configurable.

When the interface comes up, both of the following events occur:

· The device automatically restores the power supply to the interface.

· The interface restores to its normal state.

Examples

# Enable auto power-down on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] port auto-power-down

port link-mode

Use port link-mode to change the link mode of an Ethernet interface.

Use undo port link-mode to restore the default.

Syntax

port link-mode { bridge | route }

undo port link-mode

Default

Interfaces operate in bridge mode.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

bridge: Specifies the Layer 2 mode.

route: Specifies the Layer 3 mode.

Usage guidelines

Interfaces on the device can operate either as Layer 2 or Layer 3 Ethernet interfaces.

You can use commands to set the link mode to bridge or route.

Changing the link mode of an Ethernet interface also restores all commands (except shutdown and combo enable) on the Ethernet interface to their defaults in the new link mode.

Examples

# Configure GigabitEthernet 1/0/1 to operate in Layer 2 mode.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] port link-mode bridge

port up-mode

Use port up-mode to forcibly bring up a fiber Ethernet port.

Use undo port up-mode to restore the default.

Syntax

port up-mode

undo port up-mode

Default

A fiber Ethernet port is not forcibly brought up. The physical state of a fiber port depends on the physical state of the fibers.

Views

Ethernet interface view

Predefined user roles

network-admin

Usage guidelines

This command forcibly brings up a fiber Ethernet port and enables the port to forward packets unidirectionally over a single link. In this way, transmission links are well utilized.

Copper ports do not support this command.

The following operations on a fiber port will cause link updown events before the port finally stays up:

· Configure both the port up-mode command and the speed or duplex command.

· Install or remove fiber links or transceiver modules after you forcibly bring up the fiber port.

The shutdown and port up-mode commands are mutually exclusive.

A GE fiber port forcibly brought up cannot correctly forward traffic if it is installed with a fiber-to-copper converter, 100/1000-Mbps transceiver module, or 100-Mbps transceiver module. To solve the problem, use the undo port up-mode command on the fiber port.

Examples

# Forcibly bring up fiber port GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] port up-mode

priority-flow-control

Use priority-flow-control to enable PFC in auto mode or forcibly.

Use undo priority-flow-control to disable PFC.

Syntax

priority-flow-control { auto | enable }

undo priority-flow-control

Default

PFC is disabled on Ethernet interfaces.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

auto: Specifies PFC in auto mode. In this mode, the local end automatically negotiates the PFC status with its peer.

enable: Forcibly enables PFC.

Usage guidelines

When congestion occurs in the network, the local device notifies the peer to stop sending packets carrying the specified 802.1p priority if all of the following conditions exist:

· Both the local end and the remote end have PFC enabled.

· Both the local end and the remote end have the priority-flow-control no-drop dot1p command configured.

· The specified 802.1p priority is in the 802.1p priority list specified by the dot1p-list argument.

· The local end receives a packet carrying the specified 802.1p priority.

Examples

# Enable PFC in auto mode on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] priority-flow-control auto

Related commands

display priority-flow-control

priority-flow-control no-drop dot1p

Use priority-flow-control no-drop dot1p to enable PFC for 802.1p priorities.

Use undo priority-flow-control no-drop dot1p to disable PFC for the specified 802.1p priority.

Syntax

priority-flow-control no-drop dot1p dot1p-list

undo priority-flow-control no-drop dot1p

Default

PFC is disabled for all 802.1p priorities.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

dot1p-list: Specifies an 802.1p priority (or dot1p priority) list to identify flows that are subject to PFC (for example: 1,3-5). A hyphen (-) connects two numeric values, which together indicate a continuous value range. Different values or value ranges are separated with commas (,). You can configure up to 16 characters for this argument.

Usage guidelines

When congestion occurs in the network, a packet is transmitted preferentially if both of the following conditions exist:

· Both the local end and the remote end have PFC enabled and have the priority-flow-control no-drop dot1p command configured.

· The 802.1p priority of the packet received on the local end is within the 802.1p priority list specified by the dot1p-list argument. For more information about the 802.1p priority, see ACL and QoS Configuration Guide.

If you configure the flow control or flow-control receive enable command on a PFC-enabled device or interface, the following events occur:

· The PFC configuration takes effect.

· The configuration of the flow control or flow-control receive enable command is ignored.

· The flow control or flow-control receive enable command takes effect on the device or interface only when PFC is disabled on it.

Examples

# Enable PFC in auto mode on GigabitEthernet 1/0/1, and enable PFC for 802.1p priority 5.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] priority-flow-control auto

[Sysname-GigabitEthernet1/0/1] priority-flow-control no-drop dot1p 5

Related commands

display priority-flow-control

flow-control

flow-control receive enable

priority-flow-control

reset counters interface

Use reset counters interface to clear the interface statistics.

Syntax

reset counters interface [ interface-type [ interface-number | interface-number.subnumber ] ]

Views

User view

Predefined user roles

network-admin

Parameters

interface-type: Specifies an interface type.

interface-number: Specifies an interface number.

Usage guidelines

Use this command to clear history statistics if you want to collect traffic statistics for a specific time period.

If you do not specify an interface type, this command clears statistics for all interfaces.

If you specify an interface type but do not specify an interface number, this command clears statistics for all interfaces of the specified type.

Examples

# Clear the statistics for GigabitEthernet 1/0/1.

<Sysname> reset counters interface gigabitethernet 1/0/1

Related commands

display counters interface

display counters rate interface

display interface

reset ethernet statistics

Use reset ethernet statistics to clear the Ethernet module statistics.

Syntax

reset ethernet statistics [ slot slot-number ]

Views

User view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command clears statistics for all IRF member devices.

Examples

# Clear the Ethernet module statistics for the specified slot.

<Sysname> reset ethernet statistics slot 1

Related commands

display ethernet statistics

reset packet-drop interface

Use reset packet-drop interface to clear the dropped packet statistics for an interface.

Syntax

reset packet-drop interface [ interface-type [ interface-number | interface-number.subnumber ] ]

Views

User view

Predefined user roles

network-admin

Parameters

interface-type: Specify an interface type.

interface-number: Specify an interface number.

Usage guidelines

If you do not specify an interface type, this command clears dropped packet statistics for all interfaces on the device.

If you specify an interface type but do not specify an interface number or subinterface number, the command clears dropped packet statistics for all interfaces of the specified type.

Examples

# Clear dropped packet statistics for GigabitEthernet 1/0/1.

<Sysname> reset packet-drop interface gigabitethernet 1/0/1

# Clear dropped packet statistics for all interfaces.

<Sysname> reset packet-drop interface

Related commands

display packet-drop

shutdown

Use shutdown to shut down an Ethernet interface or subinterface.

Use undo shutdown to bring up an Ethernet interface or subinterface.

Syntax

shutdown

undo shutdown

Default

An Ethernet interface is in up state.

Views

Ethernet interface view

Ethernet subinterface view

Predefined user roles

network-admin

Usage guidelines

Some interface configurations might require an interface restart before taking effect.

The shutdown and port up-mode commands are mutually exclusive.

The shutdown command cannot be configured on an interface in a loopback test.

Examples

# Shut down and then bring up GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] shutdown

[Sysname-GigabitEthernet1/0/1] undo shutdown

# Shut down and then bring up GigabitEthernet 1/0/1.1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1.1

[Sysname-GigabitEthernet1/0/1.1] shutdown

[Sysname-GigabitEthernet1/0/1.1] undo shutdown

speed

Use speed to set the speed of an Ethernet interface.

Use undo speed to restore the default.

Syntax

speed { 10 | 100 | 1000 | 10000 | 20000 | auto }

undo speed

Default

An Ethernet interface negotiates a speed with its peer.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

10: Sets the interface speed to 10 Mbps.

100: Sets the interface speed to 100 Mbps.

1000: Sets the interface speed to 1000 Mbps.

10000: Sets the interface speed to 10000 Mbps.

20000: Sets the interface speed to 20000 Mbps.

auto: Enables the interface to negotiate a speed with its peer.

Usage guidelines

For an Ethernet copper port, use the speed command to set its speed to match the speed of the peer interface.

For a fiber port, use the speed command to set its speed to match the rate of a transceiver module.

Support of an interface for the keywords depends on the interface type. For more information, use the speed ? command in interface view.

Examples

# Configure GigabitEthernet 1/0/1 to autonegotiate the speed.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] speed auto

speed auto downgrade

Use speed auto downgrade to enable automatic negotiation for speed downgrading.

Use undo speed auto downgrade to disable automatic negotiation for speed downgrading.

Syntax

speed auto downgrade

undo speed auto downgrade

Default

Automatic negotiation for speed downgrading is enabled.

Views

Ethernet interface view

Predefined user roles

network-admin

Usage guidelines

This command takes effect after you configure it on the interface at either end of a link and the two interfaces are configured to automatically negotiate the speed.

This command is applicable only to GE interfaces.

Examples

# Enable automatic negotiation for speed downgrading on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] speed auto downgrade

Layer 2 Ethernet interface commands

broadcast-suppression

Use broadcast-suppression to enable broadcast suppression and set the broadcast suppression threshold.

Use undo broadcast-suppression to disable broadcast suppression.

Syntax

broadcast-suppression { ratio | pps max-pps | kbps max-kbps }

undo broadcast-suppression

Default

Ethernet interfaces do not suppress broadcast traffic.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

ratio: Sets the broadcast suppression threshold as a percentage of the interface bandwidth. The value range for this argument is 0 to 100. A smaller value means that less broadcast traffic is allowed to pass through.

pps max-pps: Specifies the maximum number of broadcast packets that the interface can forward per second. The value range for the max-pps argument (in pps) is 0 to 1.4881 × the interface bandwidth.

kbps max-kbps: Specifies the maximum number of kilobits of broadcast traffic that the Ethernet interface can forward per second. The value range for this argument (in kbps) is 0 to the interface bandwidth.

Usage guidelines

The broadcast storm suppression features limits the size of broadcast traffic to a threshold on an interface. When the broadcast traffic on the interface exceeds this threshold, the system drops packets until the traffic drops below this threshold.

Both the storm-constrain command and the broadcast-suppression command can suppress broadcast storms on a port. The broadcast-suppression command uses the chip to physically suppress broadcast traffic. It has less influence on the device performance than the storm-constrain command, which uses software to suppress broadcast traffic.

For the traffic suppression result to be determined, do not configure both the storm-constrain broadcast command and the broadcast-suppression command on an interface.

If two or more types of the broadcast, multicast, and unknown unicast suppression thresholds are set on an interface, make sure they are set in the same unit.

When you configure the suppression threshold in kbps, the actual suppression threshold might be different from the configured one as follows:

· If the configured value is smaller than 64, the value of 64 takes effect.

· If the configured value is greater than 64 but not an integer multiple of 64, the integer multiple of 64 that is greater than and closest to the configured value takes effect.

For the suppression threshold that takes effect, see the prompt on the device.

Examples

# Set the broadcast suppression threshold to 10000 kbps on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] broadcast-suppression kbps 10000

The actual value is 10048 on port GigabitEthernet1/0/1 currently.

The output shows that the value that takes effect is 10048 kbps (157 times of 64), because the chip only supports step 64.

Related commands

multicast-suppression

unicast-suppression

display storm-constrain

Use display storm-constrain to display storm control settings and statistics.

Syntax

display storm-constrain [ broadcast | known-unicast | multicast | unicast ] [ interface interface-type interface-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

broadcast: Displays broadcast storm control settings and statistics.

known-unicast: Displays known unicast storm control settings and statistics.

multicast: Displays multicast storm control settings and statistics.

unicast: Displays unknown unicast storm control settings and statistics.

interface interface-type interface-number: Specifies an interface by its type and number. If you do not specify this option, the command displays storm control settings and statistics for all storm control-enabled interfaces.

Usage guidelines

If you do not specify any keywords, this command displays all storm control settings on all storm control-enabled interfaces.

Examples

# Display the storm control settings on all storm control-enabled ports.

<Sysname> display storm-constrain

Abbreviation: BC - broadcast; MC - multicast; UC - unicast

KNUC - known unicast; FW - forwarding

Flow Statistic Interval: 5 (in seconds)

Port Type Lower Upper Unit CtrlMode Status Trap Log SwitchNum

-------------------------------------------------------------------------------------

GE1/0/1 MC 100 200 kbps shutdown shutdown off on 10

Table 8 Command output

Field	Description
Flow Statistic Interval	Traffic polling interval (in seconds) of the storm control module.
Port	Abbreviated interface name.
Type	Type of traffic subjected to storm control: · BC—Broadcast packets. · MC—Multicast packets. · UC—Unknown unicast packets. · KNUC—Known unicast packets.
Lower	Lower storm control threshold, in pps, kbps, or percentage.
Upper	Upper storm control threshold, in pps, kbps, or percentage.
Unit	Storm control threshold unit: · pps. · kbps. · percentage.
CtrlMode	Action (block or shutdown) taken on the interface when the upper threshold is reached. N/A indicates that no action is configured.
Status	Packet forwarding status: · forwarding—The port is forwarding traffic correctly. · shutdown—The port has been shut down. · block—The port drops the type of traffic.
Trap	Status of the storm control threshold event trap switch: · on—The port sends threshold event traps. · off—The port does not send threshold event traps.
Log	Status of the storm control threshold event log switch: · on—The port sends threshold event log messages. · off—The port does not send threshold event log messages.
SwitchNum	Number of forwarding state changes of the interface. When the SwitchNum field reaches 65535, it resets automatically.

mdix-mode

IMPORTANT:

Fiber ports do not support this command.

Use mdix-mode to configure the Medium Dependent Interface Cross-Over (MDIX) mode of an Ethernet interface.

Use undo mdix-mode to restore the default.

Syntax

mdix-mode { automdix | mdi| mdix }

undo mdix-mode

Default

Ethernet interfaces operate in automdix mode.

Views

Layer 2 Ethernet interface view

Predefined user roles

network-admin

Parameters

automdix: Specifies that the interface negotiates pin roles with its peer.

mdi: Specifies that pins 1 and 2 are transmit pins and pins 3 and 6 are receive pins.

mdix: Specifies that pins 1 and 2 are receive pins and pins 3 and 6 are transmit pins.

Examples

# Configure GigabitEthernet 1/0/1 to operate in automdix mode.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] mdix-mode automdix

multicast-suppression

Use multicast-suppression to enable multicast storm suppression and set the multicast storm suppression threshold.

Use undo multicast-suppression to disable multicast storm suppression.

Syntax

multicast-suppression { ratio | pps max-pps | kbps max-kbps } [ unknown ]

undo multicast-suppression

Default

Ethernet interfaces do not suppress multicast traffic.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

ratio: Sets the multicast suppression threshold as a percentage of the interface bandwidth. The value range for this argument (in percentage) is 0 to 100. A smaller value means that less multicast traffic is allowed to pass through.

pps max-pps: Specifies the maximum number of multicast packets that the interface can forward per second. The value range for the max-pps argument (in pps) is 0 to 1.4881 × the interface bandwidth.

kbps max-kbps: Specifies the maximum number of kilobits of multicast traffic that the Ethernet interface can forward per second. The value range for this argument (in kbps) is 0 to the interface bandwidth.

unknown: Enables multicast storm suppression only on unknown packets. If you do not specify this keyword, packets suppressed by this feature depend on the device model.

Usage guidelines

The multicast storm suppression feature limits the size of multicast traffic to a threshold on an interface. When the multicast traffic on the interface exceeds this threshold, the system drops packets until the traffic drops below this threshold.

Both the storm-constrain command and the multicast-suppression command can suppress multicast storms on a port. The multicast-suppression command uses the chip to physically suppress multicast traffic. It has less influence on the device performance than the storm-constrain command, which uses software to suppress multicast traffic.

For the traffic suppression result to be determined, do not configure both the storm-constrain multicast command and the multicast-suppression command on an interface.

If two or more types of the broadcast, multicast, and unknown unicast suppression thresholds are set on an interface, make sure they are set in the same unit.

When you configure the suppression threshold in kbps, the actual suppression threshold might be different from the configured one as follows:

· If the configured value is smaller than 64, the value of 64 takes effect.

· If the configured value is greater than 64 but not an integer multiple of 64, the integer multiple of 64 that is greater than and closest to the configured value takes effect.

To determine the suppression threshold that takes effect, see the prompts on the switch.

Examples

# Set the multicast storm suppression threshold to 10000 kbps on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] multicast-suppression kbps 10000

The actual value is 10048 on port GigabitEthernet1/0/1 currently.

The output shows that the value that takes effect is 10048 kbps (157 times of 64), because the chip only supports step 64.

Related commands

broadcast-suppression

unicast-suppression

port bridge enable

Use port bridge enable to enable bridging on an Ethernet interface.

Use undo port bridge enable to disable bridging on an Ethernet interface.

Syntax

port bridge enable

undo port bridge enable

Default

Bridging is disabled on an Ethernet interface.

Views

Layer 2 Ethernet interface view

Predefined user roles

network-admin

Usage guidelines

By default, the device drops packets whose outgoing interface and incoming interface are the same.

To enable the device to forward such packets rather than drop them, configure this command in Ethernet interface view. After the device receives a broadcast or unknown unicast packet, the device forwards the packet through all interfaces in the VLAN to which the incoming interface of the packet belongs.

Do not add interfaces configured with this command to an aggregation group.

Examples

# Enable bridging on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] port bridge enable

storm-constrain

Use storm-constrain to enable storm control and set thresholds for broadcast, multicast, or unknown unicast packets on an Ethernet interface.

Use undo storm-constrain to disable storm control for broadcast, multicast, unknown unicast, or all types of traffic.

Syntax

storm-constrain { broadcast | known-unicast | multicast | unicast } { pps | kbps | ratio } upperlimit lowerlimit

undo storm-constrain { all | broadcast | known-unicast | multicast | unicast }

Default

Traffic storm control is disabled.

Views

Layer 2 Ethernet interface view

Predefined user roles

network-admin

Parameters

all: Disables storm control for all types of traffic: broadcast, known unicast, multicast, and unknown unicast.

broadcast: Enables or disables broadcast storm control.

known-unicast: Enables or disables known unicast storm control.

multicast: Enables or disables multicast storm control.

unicast: Enables or disables unknown unicast storm control.

pps: Sets storm control thresholds in pps.

kbps: Sets storm control thresholds in kbps.

ratio: Sets storm control thresholds as a percentage of the transmission capacity of the interface.

upperlimit: Sets the upper threshold, in pps, kbps, or percentage.

· If you specify the pps keyword, the value range for the upperlimit argument is 0 to 1.4881 × the interface bandwidth.

· If you specify the kbps keyword, the value range for the upperlimit argument is 0 to the interface bandwidth.

· If you specify the ratio keyword, the value range for the upperlimit argument is 0 to 100.

lowerlimit: Sets the lower threshold, in pps, kbps, or percentage.

· If you specify the pps keyword, the value range for the lowerlimit argument is 0 to 1.4881 × the interface bandwidth.

· If you specify the kbps keyword, the value range for the lowerlimit argument is 0 to the interface bandwidth.

· If you specify the ratio keyword, the value range for the lowerlimit argument is 0 to 100.

Usage guidelines

After you configure storm control for a type of traffic, the device collects the statistics for the type of traffic at the interval configured by using the storm-constrain interval command. When the type of traffic exceeds its upper threshold, the interface takes an action configured by using the storm-constrain control command.

The storm-constrain, broadcast-suppression, multicast-suppression, and unicast-suppression commands can suppress storms on an interface. The broadcast-suppression, multicast-suppression, and unicast-suppression commands use the chip to physically suppress traffic. They have less influence on the device performance than the storm-constrain command, which uses software to suppress traffic.

For the traffic suppression result to be determined, do not configure both storm control and storm suppression for the same type of traffic.

When configuring this command, make sure upperlimit is greater than lowerlimit.

Examples

# Enable unknown unicast storm control on GigabitEthernet 1/0/1 and set the upper and lower thresholds to 200 pps and 150 pps, respectively.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] storm-constrain unicast pps 200 150

# Enable broadcast storm control on GigabitEthernet 1/0/2, and set the upper and lower thresholds to 2000 kbps and 1500 kbps, respectively.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/2

[Sysname-GigabitEthernet1/0/2] storm-constrain broadcast kbps 2000 1500

# Enable multicast storm control on GigabitEthernet 1/0/3, and set the upper and lower thresholds to 80% and 15%, respectively.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/3

[Sysname-GigabitEthernet1/0/3] storm-constrain multicast ratio 80 15

Related commands

storm-constrain control

storm-constrain interval

storm-constrain control

Use storm-constrain control to set the action to take on an Ethernet interface when a type of traffic (unknown unicast, multicast, or broadcast) exceeds the upper storm control threshold.

Use undo storm-constrain control to restore the default.

Syntax

storm-constrain control { block | shutdown }

undo storm-constrain control

Default

No action is taken on an Ethernet interface when a type of traffic exceeds the upper storm control threshold.

Views

Layer 2 Ethernet interface view

Predefined user roles

network-admin

Parameters

block: Blocks this type of traffic and forwards other types of traffic. Even though the interface does not forward the blocked traffic, it still counts the traffic. When the blocked traffic drops below the lower threshold, the port begins to forward the traffic.

shutdown: Goes down automatically. The interface goes down automatically and stops forwarding any traffic. When the blocked traffic drops below the lower threshold, the interface does not forward the traffic. To bring up the interface, use the undo shutdown command or disable storm control on the interface.

Examples

# Configure GigabitEthernet 1/0/1 to block a specific type of traffic when the type of traffic exceeds the upper storm control threshold.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] storm-constrain control block

Related commands

storm-constrain

storm-constrain control

storm-constrain enable log

Use storm-constrain enable log to enable an Ethernet interface to output log messages when it detects storm control threshold events.

Use undo storm-constrain enable log to disable an Ethernet interface from outputting log messages for storm control threshold events.

Syntax

storm-constrain enable log

undo storm-constrain enable log

Default

An Ethernet interface outputs log messages when monitored traffic exceeds the upper threshold or drops below the lower threshold.

Views

Layer 2 Ethernet interface view

Predefined user roles

network-admin

Examples

# Enable GigabitEthernet 1/0/1 to output log messages when it detects storm control threshold events.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] storm-constrain enable log

storm-constrain enable trap

Use storm-constrain enable trap to enable an Ethernet interface to send storm control threshold event traps.

Use undo storm-constrain enable trap to disable an Ethernet interface from sending storm control threshold event traps.

Syntax

storm-constrain enable trap

undo storm-constrain enable trap

Default

An interface sends out storm control threshold event traps when monitored traffic exceeds the upper threshold or drops below the lower threshold.

Views

Layer 2 Ethernet interface view

Predefined user roles

network-admin

Examples

# Enable GigabitEthernet 1/0/1 to send traps when it detects storm control threshold events.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] storm-constrain enable trap

storm-constrain interval

Use storm-constrain interval to set the traffic polling interval of the storm control module.

Use undo storm-constrain interval to restore the default.

Syntax

storm-constrain interval interval

undo storm-constrain interval

Default

The storm control module polls traffic statistics every 10 seconds.

Views

System view

Predefined user roles

network-admin

Parameters

interval: Sets the traffic polling interval of the storm control module. The value range is 1 to 300 seconds. To ensure network stability, as a best practice, do not use a traffic polling interval shorter than 10 seconds.

Usage guidelines

The traffic polling interval set by using the storm-constrain interval command is specific to storm control. To set the statistics polling interval of an interface, use the flow-interval command.

Examples

# Set the traffic statistics polling interval of the storm control module to 60 seconds.

<Sysname> system-view

[Sysname] storm-constrain interval 60

Related commands

storm-constrain

storm-constrain control

unicast-suppression

Use unicast-suppression to enable unknown unicast storm suppression and set the unknown unicast storm suppression threshold.

Use undo unicast-suppression to disable unknown unicast storm suppression.

Syntax

unicast-suppression { ratio | pps max-pps | kbps max-kbps }

undo unicast-suppression

Default

Ethernet interfaces do not suppress unknown unicast traffic.

Views

Ethernet interface view

Predefined user roles

network-admin

Parameters

ratio: Sets the unknown unicast suppression threshold as a percentage of the interface bandwidth. The value range for this argument (in percentage) is 0 to 100. A smaller value means that less unknown unicast traffic is allowed to pass through.

pps max-pps: Specifies the maximum number of unknown unicast packets that the interface can forward per second. The value range for the max-pps argument (in pps) is 0 to 1.4881 × the interface bandwidth.

kbps max-kbps: Specifies the maximum number of kilobits of unknown unicast traffic that the Ethernet interface can forward per second. The value range for this argument (in kbps) is 0 to the interface bandwidth.

Usage guidelines

The unknown unicast storm suppression feature limits the size of unknown unicast traffic to a threshold on an interface. When the unknown unicast traffic on the interface exceeds this threshold, the system discards packets until the unknown unicast traffic drops below this threshold.

Both the storm-constrain command and the unicast-suppression command can suppress unknown unicast storms on a port. The unicast-suppression command uses the chip to physically suppress unknown unicast traffic. It has less influence on the device performance than the storm-constrain command, which uses software to suppress unknown unicast traffic.

For the unknown unicast traffic suppression result to be determined, do not configure both the storm-constrain unicast command and the unicast-suppression command on an interface.

If two or more types of the broadcast, multicast, and unknown unicast suppression thresholds are set on an interface, make sure they are set in the same unit.

When you configure the suppression threshold in kbps, the actual suppression threshold might be different from the configured one as follows:

· If the configured value is smaller than 64, the value of 64 takes effect.

· If the configured value is greater than 64 but not an integer multiple of 64, the integer multiple of 64 that is greater than and closest to the configured value takes effect.

To determine the suppression threshold that takes effect, see the prompts on the switch.

Examples

# Set the unknown unicast storm suppression threshold to 10000 kbps on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] unicast-suppression kbps 10000

The actual value is 10048 on port GigabitEthernet1/0/1 currently.

The output shows that the value that takes effect is 10048 kbps (157 times of 64), because the chip only supports step 64.

Related commands

broadcast-suppression

multicast-suppression

virtual-cable-test

IMPORTANT:

This command is not available on fiber ports.

Use virtual-cable-test to test the cable connection of an Ethernet interface and display the test result.

Syntax

virtual-cable-test

Views

Layer 2 Ethernet interface view

Predefined user roles

network-admin

Usage guidelines

If the link of an Ethernet interface is up, testing its cable connection will cause the link to go down and then up.

The test result is for reference only. The cable length detection error is up to 5 m (about 16 ft).

If a test item is not available, a hyphen (-) is displayed.

Examples

# Test the cable connection of GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] virtual-cable-test

Cable status: abnormal(open), 140 metre(s)

Pair Impedance mismatch: -

Pair skew: - ns

Pair swap: -

Pair polarity: -

Insertion loss: - db

Return loss: - db

Near-end crosstalk: - db

Table 9 Command output

Field	Description
Cable status	Cable status: · Normal—The cable is in good condition. · Abnormal—The cable is abnormal. · Abnormal (open)—An open circuit is detected. · Abnormal (short)—A short circuit is detected. · Failure—The test failed.
n metre(s)	If the cable connection is working correctly, this field displays the total length of the cable. If the cable connection fails, this field displays the length from the local port to the faulty point.

Field

Description

Cable status

Cable status:

· Normal—The cable is in good condition.

· Abnormal—The cable is abnormal.

· Abnormal (open)—An open circuit is detected.

· Abnormal (short)—A short circuit is detected.

· Failure—The test failed.

n metre(s)

If the cable connection is working correctly, this field displays the total length of the cable.

If the cable connection fails, this field displays the length from the local port to the faulty point.

Layer 3 Ethernet interface or subinterface commands

mtu

Use mtu to set the MTU for an Ethernet interface or subinterface.

Use undo mtu to restore the default.

Syntax

mtu size

undo mtu

Default

The MTU of an Ethernet interface or subinterface is 1500 bytes.

Views

Layer 3 Ethernet interface view

Layer 3 Ethernet subinterface view

Predefined user roles

network-admin

Parameters

size: Sets the MTU in bytes. The value range for this argument is 128 to 9216.

Usage guidelines

The configured MTU takes effect only on the packets sent by the CPU. To avoid unnecessary fragmentation, set a proper MTU value. If an interface is configured with both the mtu command and the ip mtu command, IPv4 packets are fragmented according to the ip mtu command configuration. For more information about the ip mtu command, see IP performance optimization commands in Layer 3—IP Services Command Reference.

Examples

# Set the MTU to 1430 bytes for GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] mtu 1430

# Set the MTU to 1430 bytes for GigabitEthernet 1/0/1.1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1.1

[Sysname-GigabitEthernet1/0/1.1] mtu 1430

03-Layer 2—LAN Switching Command Reference

flow-control receive enable

reset counters interface

broadcast-suppression

mdix-mode

multicast-suppression

storm-constrain

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