· Layer 3 Ethernet interfaces—Physical Ethernet interfaces operating at the network layer (Layer 3) to route packets. You can assign an IP address to a Layer 3 Ethernet interface.

· Layer-configurable Ethernet interfaces—Physical Ethernet interfaces that can be configured to operate in bridge mode as Layer 2 Ethernet interfaces or in route mode as Layer 3 Ethernet interfaces.

Configuring common Ethernet interface settings

This section describes the settings common to Layer 2 Ethernet interfaces and Layer 3 Ethernet interfaces. For more information about the settings specific to Layer 2 Ethernet interfaces, see "Configuring a Layer 2 Ethernet interface." For more information about the settings specific to Layer 3 Ethernet interfaces, see "Configuring a Layer 3 Ethernet interface."

Ethernet interface naming conventions

When the switches operate in standalone mode, the Ethernet interfaces are named in the format of interface-type A/B/C, where the following definitions apply:

· A—Represents the slot number of the card.

· B—Represents the number of a subcard on a card. If the card has no subcards, this value is 0.

· C—Represents the number of an interface.

When the switches operate in IRF mode, the Ethernet interfaces are named in the format of interface-type A/B/C/D, where the following definitions apply:

· A—Represents the member ID of an IRF member switch. This value is 1 or 2.

· B—Represents the slot number of the card.

· C—Represents the number of a subcard on a card. If the card has no subcards, this value is 0.

· D—Represents the number of an interface.

Configuring a combo interface

A combo interface is a logical interface that physically comprises one fiber combo port and one copper combo port. The two ports share one forwarding channel and one interface view. As a result, they cannot work simultaneously. When you activate one port, the other port is automatically disabled. In the interface view, you can activate the fiber or copper combo port, and configure other port attributes such as the interface rate and duplex mode.

Configuration prerequisites

Before you configure combo interfaces, complete the following tasks:

· Determine the combo interfaces on your device. Identify the two physical interfaces that belong to each combo interface according to the marks on the device panel.

· Use the display interface command to determine which port (fiber or copper) of each combo interface is active:

¡ If the copper port is active, the output includes "Media type is twisted pair, Port hardware type is 1000_BASE_T."

¡ If the fiber port is active, the output does not include this information.

Also, you can use the display this command in the view of each combo interface to display the combo interface configuration:

¡ If the fiber port is active, the combo enable fiber command exists in the output.

¡ If the copper port is active, the combo enable fiber command does not exist in the output.

Changing the active port of a combo interface

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Activate the copper combo port or fiber combo port.	combo enable { copper \| fiber }	By default, the fiber combo port is active.

Splitting a 40-GE interface and combining 10-GE breakout interfaces

IMPORTANT:

· This feature is not supported on non-default MDCs.

· 40-GE interfaces on an LSQM1SRP8X2QE0 MPU do not support this feature.

Splitting a 40-GE interface into four 10-GE breakout interfaces

IMPORTANT:

Before you reboot a switch configured with the using tengige command, save the splitting configuration on the switch even if the switch is an IRF member switch. Otherwise, the splitting configuration cannot take effect.

You can use a 40-GE interface as a single interface. To improve port density, reduce costs, and improve network flexibility, you can also split a 40-GE interface into four 10-GE breakout interfaces.

For example, you can split a 40-GE interface FortyGigE 1/1/16 into four 10-GE breakout interfaces Ten-GigabitEthernet 1/1/16:1 through Ten-GigabitEthernet 1/1/16:4.

After you configure this feature on a 40-GE interface, reboot the interface module. The system deletes the 40-GE interface and creates the four 10-GE breakout interfaces.

To split a 40-GE interface into four 10-GE breakout interfaces:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter 40-GE interface view.	interface interface-type interface-number	N/A
3. Split the 40-GE interface into four 10-GE breakout interfaces.	using tengige	By default, a 40-GE interface is not split and operates as a single interface. The 10-GE breakout interfaces support the same configuration and attributes as common 10-GE interfaces, except that they are numbered differently. A 40-GE interface split into four 10-GE breakout interfaces must use a dedicated 1-to-4 cable. For more information about the cables, see H3C S7500E Switch Series Installation Guide.

Combining four 10-GE breakout interfaces into a 40-GE interface

IMPORTANT:

Before you reboot a switch configured with the using fortygige command, save the combining configuration on the switch even if the switch is an IRF member switch. Otherwise, the combining configuration cannot take effect.

If you need higher bandwidth on a single interface, you can combine the four 10-GE breakout interfaces into a 40-GE interface.

After you configure this feature on a 10-GE breakout interface, reboot the interface module. The system deletes the four 10-GE breakout interfaces and creates the 40-GE interface.

To combine four 10-GE breakout interfaces into a 40-GE interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter the view of any 10-GE breakout interface.	interface interface-type interface-number	N/A
3. Combine the four 10-GE breakout interfaces into a 40-GE interface.	using fortygige	By default, a 40-GE interface is not split and operates as a single interface. After you combine the four 10-GE breakout interfaces, replace the dedicated 1-to-4 cable with a dedicated 1-to-1 cable or a 40-GE transceiver module. For more information about the cable or transceiver module, see H3C S7500E Switch Series Installation Guide.

Configuring basic settings of an Ethernet interface

You can configure an Ethernet interface to operate in one of the following duplex modes:

· Full-duplex mode—The interface can send and receive packets simultaneously.

· Half-duplex mode—The interface can only send or receive packets at a given time.

· Autonegotiation mode—The interface negotiates a duplex mode with its peer.

To configure basic settings of an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Set the description for the Ethernet interface.	description text	The default setting is interface-name Interface. For example, GigabitEthernet1/0/1 Interface.
4. Set the duplex mode for the Ethernet interface.	duplex { auto \| full \| half }	By default: · The duplex mode is full for 10-GE, 40-GE interfaces. · The duplex mode is auto for other Ethernet interfaces. Copper ports on LSQM2GT24PTSSC0, LSQM2GT24TSSC0, LSQM2GT48SC0, LSQM4GV48SC0, and LSQM2GT48SA0 interface modules and fiber ports do not support the half keyword or autonegotiated half duplex mode. For Ethernet interfaces connected to the same cable to operate correctly, you must configure the same duplex mode for them.
5. Set the speed for the Ethernet interface.	speed { 10 \| 100 \| 1000 \| 10000 \| 40000 \| 100000 \| auto }	Support for the keywords of the command depends on the interface type. For more information, see Interface Command Reference. By default: · The speed of a 10-GE XFP fiber port is 10000 Mbps. · The speeds of other Ethernet interfaces are autonegotiated. For Ethernet interfaces connected to the same cable to operate correctly, you must configure the same speed for them.
6. Set the expected bandwidth for the Ethernet interface.	bandwidth bandwidth-value	By default, the expected bandwidth (in kbps) is the interface baud rate divided by 1000.
7. Restore the default settings for the Ethernet interface.	default	N/A
8. Bring up the Ethernet interface.	undo shutdown	By default, an Ethernet interface is up.

Configuring the link mode of an Ethernet interface

CAUTION:

After you change the link mode of an Ethernet interface, all commands (except the shutdown and combo enable commands) on the Ethernet interface are restored to their defaults in the new link mode.

An Ethernet interface can operate in either of the following modes:

· bridge—The Ethernet interface operates as an Layer 2 interface.

· route—The Ethernet interface operates as an Layer 3 interface.

This feature is not applicable to IRF ports, internal interfaces on an LSQ OAP module, reflector ports of a remote source group. For more information about internal interfaces on an OAP module, see OAA Configuration Guide. For more information about reflector ports, see Network Management and Monitoring Configuration Guide.

To configure the link mode of an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Configure the link mode of the Ethernet interface.	port link-mode { bridge \| route }	By default, an Ethernet interface operates in bridge mode.

Configuring jumbo frame support

An Ethernet interface might receive frames larger than the standard Ethernet frame size during high-throughput data exchanges, such as file transfers. These frames are called jumbo frames.

The Ethernet interface processes jumbo frames in the following ways:

· When the Ethernet interface is configured to deny jumbo frames, the Ethernet interface discards jumbo frames.

· When the Ethernet interface is configured with jumbo frame support, the Ethernet interface performs the following tasks:

¡ Processes jumbo frames within the specified length.

¡ Discards jumbo frames that exceed the specified length.

To configure jumbo frame support in interface view:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Configure jumbo frame support.	jumboframe enable [ value ]	By default, the device allows jumbo frames within 9216 bytes to pass through all Layer 2 Ethernet interfaces. If you set the value argument multiple times, the most recent configuration takes effect.

Configuring physical state change suppression on an Ethernet interface

IMPORTANT:

Do not enable this feature on an interface with RRPP, MSTP, or Smart Link enabled.

The physical link state of an Ethernet interface is either up or down. Each time the physical link of an interface comes up or goes down, the interface immediately reports the change to the CPU. The CPU then performs the following tasks:

· Notifies the upper-layer protocol modules (such as routing and forwarding modules) of the change for guiding packet forwarding.

· Automatically generates traps and logs to inform users to take the correct actions.

To prevent frequent physical link flapping from affecting system performance, configure physical state change suppression. 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.

· The link-delay command and the link-delay mode command overwrite each other, and whichever is configured last takes effect.

To configure physical state change suppression on an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Set the suppression interval for link-down events.	link-delay [ msec ] delay-time	By default, link-down events are not suppressed.
4. Set the suppression interval for link-up events.	link-delay [ msec ] delay-time mode up	By default, link-up events are not suppressed.
5. Set the suppression interval for both link-up and link-down events.	link-delay [ msec ] delay-time mode updown	By default, neither link-up nor link-down events are suppressed.

Enabling loopback testing on an Ethernet interface

CAUTION:

After you enable this feature on an Ethernet interface, the interface does not forward data traffic.

IMPORTANT:

This feature is used only for debugging and troubleshooting.

Perform this task to determine whether an Ethernet link operates correctly.

Loopback testing includes the following types:

· Internal loopback testing—Tests the device where the Ethernet interface resides. The Ethernet interface sends outgoing packets back to the local device. If the device fails to receive the packets, the device fails.

· External loopback testing—Tests the inter-device link. The Ethernet interface sends incoming packets back to the remote device. If the remote device fails to receive the packets, the inter-device link fails

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

Configuration restrictions and guidelines

When you perform loopback tests, follow these restrictions and guidelines:

· You cannot enable loopback testing on an administratively shut down Ethernet interface (displayed as in ADM or Administratively DOWN state).

· After you enable loopback testing on an Ethernet interface, the speed, duplex, mdix-mode, port up-mode, and shutdown commands are not available on the Ethernet interface.

· Do not enable loopback testing on an interface enabled with voice VLAN, MAC learning limit, MAC address learning, 802.1X, or MAC authentication. Otherwise, these features cannot take effect. To enable these features to take effect on the interface, cancel the loopback test and configure the features again.

Configuration procedure

To enable loopback testing on an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Enable loopback testing.	loopback { external \| internal }	By default, loopback testing is disabled on an Ethernet interface. 10-GE and 40-GE interfaces on an LSQM1SRP8X2QE0 MPU do not support the external keyword.

Configuring generic flow control on an Ethernet interface

IMPORTANT:

· This feature is not applicable to interfaces that operate in the half duplex mode.

· Enabling or disabling this feature on an interface will cause the interface to go down and then come up.

To avoid dropping packets on a link, you can enable generic flow control at both ends of the link. When traffic congestion occurs at the receiving end, the receiving end sends a flow control (Pause) frame to ask the sending end to suspend sending packets. Generic flow control includes the following types:

· TxRx-mode generic flow control—Enabled by using the flow-control command. With TxRx-mode generic flow control enabled, an interface can both send and receive flow control frames:

¡ When congestion occurs, the interface sends a flow control frame to its peer.

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

· Rx-mode generic flow control—Enabled by using the flow-control receive enable command. With Rx-mode generic flow control enabled, an interface can receive flow control frames, but it cannot send flow control frames:

¡ When congestion occurs, the interface cannot send flow control frames to its peer.

¡ When the interface receives a flow control frame from its peer, it suspends sending packets to its 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 end. To enable both ends of a link to handle traffic congestion, configure the flow-control command at both ends.

To enable generic flow control on an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Enable generic flow control.	· Enable TxRx-mode generic flow control: flow-control · Enable Rx-mode generic flow control: flow-control receive enable	By default, generic flow control is disabled on an Ethernet interface.

Enabling EEE on an Ethernet interface

With Energy Efficient Ethernet (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 device automatically restores power supply to the interface and the interface restores to the normal state.

This feature is applicable only to copper ports on the following interface modules:

· SA interface module: LSQM2GT48SA0.

· SC interface modules:

¡ LSQM2GT24PTSSC0.

¡ LSQM2GT24TSSC0.

¡ LSQM4GV48SC0.

¡ LSQM2GT48SC0.

· For this feature to take effect on an interface, configure the interface to automatically negotiate a speed or duplex mode with the remote end.

To enable EEE on an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Enable EEE on the Ethernet interface.	eee enable	By default, EEE is disabled on an Ethernet interface.

Setting the statistics polling interval

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Set the statistics polling interval for the Ethernet interface.	flow-interval interval	By default, the statistics polling interval is 300 seconds.

To display the interface statistics collected in the last statistics polling interval, use the display interface command.

Forcibly bringing up a fiber port

CAUTION:

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

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

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

As shown in Figure 1, a fiber port uses separate fibers for transmitting and receiving packets. The physical state of the fiber port is up only when both transmit and receive fibers are physically connected. If one of the fibers is disconnected, the fiber port does not work.

To enable a fiber port to forward traffic over a single link, you can use the port up-mode command. This command forcibly brings up a fiber port, even when no fiber links or transceiver modules are present for the fiber port. When one fiber link is present and up, the fiber port can forward packets over the link unidirectionally.

Figure 1 Forcibly bring up a fiber port

Configuration restrictions and guidelines

When you forcibly bring up a fiber port, follow these restrictions and guidelines:

· The port up-mode command is mutually exclusive with both the shutdown and loopback commands.

· 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.

Configuration procedure

To forcibly bring up a fiber port:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	Only GE, 10-GE, 40-GE fiber ports support this feature. Copper ports and combo ports do not support this feature.
3. Forcibly bring up the fiber port.	port up-mode	By default, a fiber port is not forcibly brought up, and the physical state of a fiber port depends on the physical state of the fibers.

Configuring a Layer 2 Ethernet interface

Configuring storm suppression

IMPORTANT:

PEXs do not support unknown unicast suppression. For more information about PEXs, see Virtual Technologies Configuration Guide.

The storm suppression feature ensures that the size of a particular type of traffic (broadcast, multicast, or unknown unicast traffic) does not exceed the threshold on an interface. When the broadcast, multicast, or unknown unicast traffic on the interface exceeds this threshold, the system discards packets until the traffic drops below this threshold.

Any of the storm-constrain, broadcast-suppression, multicast-suppression, and unicast-suppression commands can suppress storm on an interface. The broadcast-suppression, multicast-suppression, and unicast-suppression commands suppress traffic in hardware. They have less impact on the device performance than the storm-constrain command, which suppresses traffic in software.

Configuration restrictions and guidelines

When you configure storm suppression, follow these restrictions and guidelines:

· For the same type of traffic, do not configure storm control together with storm suppression. Otherwise, the traffic suppression result is not determined. For more information about storm control, see "Configuring storm control on an Ethernet interface."

· 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.

· To configure the multicast-suppression command together with the broadcast-suppression command on an PEX physical interface in an IRF 3 system, set the same parameter for both commands. For example, if the multicast suppression threshold is configured in kbps, the broadcast suppression threshold must also be configured in kbps.

Configuration procedure

To set storm suppression thresholds on an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Enable broadcast suppression and set the broadcast suppression threshold.	broadcast-suppression { ratio \| pps max-pps \| kbps max-kbps }	By default, broadcast suppression is disabled.
4. Enable multicast suppression and set the multicast suppression threshold.	multicast-suppression { ratio \| pps max-pps \| kbps max-kbps }	By default, multicast suppression is disabled.
5. Enable unknown unicast suppression and set the unknown unicast suppression threshold.	unicast-suppression { ratio \| pps max-pps \| kbps max-kbps }	By default, unknown unicast suppression is disabled.

Configuring storm control on an Ethernet interface

About storm control

Storm control compares broadcast, multicast, and unknown unicast traffic regularly with their respective traffic thresholds on an Ethernet interface. For each type of traffic, storm control provides a lower threshold and an upper threshold.

Depending on your configuration, when a particular type of traffic exceeds its upper threshold, the interface performs either of the following tasks:

· 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 interface begins to forward the traffic.

· 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 automatically come up. To bring up the interface, use the undo shutdown command or disable the storm control feature.

You can configure an Ethernet interface to output threshold event traps and log messages when monitored traffic meets one of the following conditions:

· Exceeds the upper threshold.

· Drops below the lower threshold.

Storm control uses a complete polling cycle to collect traffic data, and analyzes the data in the next cycle. An interface takes one to two polling intervals to take a storm control action.

Configuration restrictions and guidelines

For the same type of traffic, do not configure storm control together with storm suppression. Otherwise, the traffic suppression result is not determined. For more information about storm suppression, see "Configuring storm suppression."

Configuration procedure

To configure storm control on an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. (Optional.) Set the statistics polling interval of the storm control module.	storm-constrain interval seconds	The default setting is 10 seconds. For network stability, use the default or set a longer statistics polling interval.
3. Enter Ethernet interface view.	interface interface-type interface-number	N/A
4. (Optional.) Enable storm control, and set the lower and upper thresholds for broadcast, multicast, or unknown unicast traffic.	storm-constrain { broadcast \| multicast \| unicast } { pps \| kbps \| ratio } max-pps-values min-pps-values	By default, storm control is disabled.
5. Set the control action to take when monitored traffic exceeds the upper threshold.	storm-constrain control { block \| shutdown }	By default, storm control is disabled.
6. (Optional.) Enable the Ethernet interface to output log messages when it detects storm control threshold events.	storm-constrain enable log	By default, the Ethernet interface outputs log messages when monitored traffic exceeds the upper threshold or drops below the lower threshold.
7. (Optional.) Enable the Ethernet interface to send storm control threshold event traps.	storm-constrain enable trap	By default, the Ethernet interface sends traps when monitored traffic exceeds the upper threshold or drops below the lower threshold from the upper threshold.

Setting the MDIX mode of an Ethernet interface

IMPORTANT:

Fiber ports do not support the MDIX mode setting.

A physical Ethernet interface has eight pins, each of which plays a dedicated role. For example, pins 1 and 2 transmit signals, and pins 3 and 6 receive signals. You can use both crossover and straight-through Ethernet cables to connect copper Ethernet interfaces. To accommodate these types of cables, a copper Ethernet interface can operate in one of the following Medium Dependent Interface-Crossover (MDIX) modes:

· MDIX mode—Pins 1 and 2 are receive pins and pins 3 and 6 are transmit pins.

· MDI mode—Pins 1 and 2 are transmit pins and pins 3 and 6 are receive pins.

· AutoMDIX mode—The interface negotiates pin roles with its peer.

To enable a copper Ethernet interface to communicate with its peer, set the MDIX mode of the interface by following these guidelines:

· Typically, set the MDIX mode of the interface to AutoMDIX. Set the MDIX mode of the interface to MDI or MDIX only when the device cannot determine the cable type.

· When a straight-through cable is used, configure the interface to operate in an MDIX mode different than its peer.

· When a crossover cable is used, perform one of the following operations:

¡ Configure the interface to operate in the same MDIX mode as its peer.

¡ Configure either end to operate in AutoMDIX mode.

To set the MDIX mode of an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Set the MDIX mode of the Ethernet interface.	mdix-mode { automdix \| mdi \| mdix }	By default, a copper Ethernet interface operates in auto mode to negotiate pin roles with its peer.

Testing the cable connection of an Ethernet interface

IMPORTANT:

Fiber ports do not support this feature.

This feature tests the cable connection of an Ethernet interface. The test result includes the cable's status and some physical parameters. If any fault is detected, the test result shows the length from the local port to the faulty point.

To test the cable connection of an Ethernet interface:

Step	Command
1. Enter system view.	system-view
2. Enter Ethernet interface view.	interface interface-type interface-number
3. Perform a test for the cable connected to the Ethernet interface.	virtual-cable-test

Enabling bridging on an Ethernet interface

When a packet arrives at an interface, the switch looks up the destination MAC address of the packet in the MAC address table. If the outgoing interface of the entry found is the same as the incoming interface, the switch drops the packet. To enable the switch to forward such packets rather than drop them, enable bridging on the Ethernet interface.

If no entry is found for the destination MAC address, the switch sends an ARP packet out of all interfaces except the incoming interface. To enable the switch to send the ARP packet out of the incoming interface, enable bridging on the Ethernet interface.

To enable bridging on an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Enable bridging on the Ethernet interface.	port bridge enable	By default, bridging is disabled on the Ethernet interface.

Configuring a Layer 3 Ethernet interface

Setting the MTU for an Ethernet interface

The maximum transmission unit (MTU) of an Ethernet interface affects the fragmentation and reassembly of IP packets on the interface. Typically, you do not need to modify the MTU of an interface.

To set the MTU for an Ethernet interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Ethernet interface view.	interface interface-type interface-number	N/A
3. Set the MTU of the Ethernet interface.	mtu size	The default setting is 1500 bytes.

Displaying and maintaining an Ethernet interface

Execute display commands in any view and reset commands in user view.

Task	Command
Display interface traffic statistics.	display counters { inbound \| outbound } interface [ interface-type [ interface-number ] ]
Display traffic rate statistics of interfaces in up state over the last statistics polling interval.	display counters rate { inbound \| outbound } interface [ interface-type [ interface-number ] ]
Display the operational and status information of the specified interfaces.	display interface [ interface-type ] [ brief [ down ] ] display interface [ interface-type [ interface-number ] ] [ brief [ description ] ]
Display information about dropped packets on the specified interfaces.	display packet-drop { interface [ interface-type [ interface-number ] ] \| summary }
Display information about storm control on the specified interfaces.	display storm-constrain [ broadcast \| multicast \| unicast ] [ interface interface-type interface-number ]
Display the Ethernet statistics (in standalone mode).	display ethernet statistics slot slot-number
Display the Ethernet statistics (in IRF mode).	display ethernet statistics chassis chassis-number slot slot-number
Clear interface statistics.	reset counters interface [ interface-type [ interface-number ] ]
Clear the statistics of dropped packets on the specified interfaces.	reset packet-drop interface [ interface-type [ interface-number ] ]
Clear the Ethernet statistics (in standalone mode).	reset ethernet statistics slot slot-number
Clear the Ethernet statistics (in IRF mode).	reset ethernet statistics chassis chassis-number slot slot-number

03-Interface Configuration Guide

Configuring Ethernet interfaces

Configuring common Ethernet interface settings

Configuration prerequisites

Changing the active port of a combo interface

Splitting a 40-GE interface into four 10-GE breakout interfaces

Combining four 10-GE breakout interfaces into a 40-GE interface

Configuration restrictions and guidelines

Configuration procedure

Configuration restrictions and guidelines

Configuration procedure

Configuring storm suppression

Configuration restrictions and guidelines

Configuration procedure

Configuring storm control on an Ethernet interface

About storm control

Configuration restrictions and guidelines

Configuration procedure

Setting the MDIX mode of an Ethernet interface

Enabling bridging on an Ethernet interface

Displaying and maintaining an Ethernet interface

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