Login
- Table of Contents
- Related Documents
-
| Title | Size | Download |
|---|---|---|
| 02-Ethernet interface configuration | 123.71 KB |
Contents
Configuring Ethernet interfaces
Configuring a management Ethernet interface
Ethernet interface naming conventions
Configuring common Ethernet interface settings
Configuring basic settings of an Ethernet interface
Configuring the link mode of an Ethernet interface
Configuring jumbo frame support
Configuring physical state change suppression on an Ethernet interface
Enabling link flapping protection on an interface
Configuring PFC on an Ethernet interface
Setting the statistics polling interval
Enabling loopback testing on an Ethernet interface
Configuring interface alarm functions
Restoring the default settings for an interface
Configuring a Layer 3 Ethernet interface
Setting the MTU for an Ethernet interface
Verifying and maintaining Ethernet interfaces
Displaying the configuration and running status of Ethernet interfaces
Displaying and clearing Ethernet interface statistics
Displaying and clearing Ethernet module statistics
Displaying and clearing physical link state change statistics of interfaces
Configuring Ethernet interfaces
About Ethernet interface
The Switch Series supports Ethernet interfaces, management Ethernet interfaces, Console interfaces, and USB interfaces. For the interface types and the number of interfaces supported by a switch model, see the installation guide.
This chapter describes how to configure management Ethernet interfaces and Ethernet interfaces.
Configuring a management Ethernet interface
About this task
A management interface uses an RJ-45 connector. You can connect the interface to a PC for software loading and system debugging, or connect it to a remote NMS for remote system management.
Procedure
1. Enter system view.
system-view
2. Enter management Ethernet interface view.
interface M-GigabitEthernet interface-number
3. (Optional.) Set the interface description.
description text
The default setting is M-GigabitEthernet0/0/0 Interface.
4. (Optional.) Set the duplex mode for the management Ethernet interface.
duplex { auto | full | half }
By default, the duplex mode is auto for a management Ethernet interface.
5. (Optional.)_Set the speed for the management Ethernet interface.
speed { 10 | 100 | 1000 | auto }
By default, the speed is auto for a management Ethernet interface.
6. (Optional.) Shut down the interface.
shutdown
By default, the management Ethernet interface is up.
Ethernet interface naming conventions
The Ethernet interfaces are named in the format of interface type A/B/C. The letters that follow the interface type represent the following elements:
· A—A is 1 by default.
· B—Card slot number. 0 indicates the interface is a fixed interface of the switch.
· C—Port index.
Configuring common Ethernet interface settings
Configuring basic settings of an Ethernet interface
About this task
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.
· Autonegotiation mode—The interface negotiates a duplex mode with its peer.
You can set the speed of an Ethernet interface or enable it to automatically negotiate a speed with its peer.
Restrictions and guidelines
The shutdown and port up-mode commands are mutually exclusive.
For information about the bandwidth, description, and shutdown commands, see Interface Command Reference.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Set the description for the Ethernet interface.
description text
The default setting is interface-name Interface. For example, Twenty-FiveGigE1/0/1 Interface.
4. Set the duplex mode for the Ethernet interface.
duplex { auto | full }
By default, the duplex mode is auto for Ethernet interfaces.
5. Set the speed for the Ethernet interface.
speed { 10 | 100 | 1000 | 10000 | 25000 | 40000 | 100000 | auto }
By default, the speed of an Ethernet interface is autonegotiated.
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. Bring up the Ethernet interface.
undo shutdown
By default, an Ethernet interface is down.
Configuring the link mode of an Ethernet interface
About this task
Ethernet interfaces can operate either as Layer 2 or Layer 3 Ethernet interfaces. You can set the link mode to bridge (Layer 2) or route (Layer 3) for these Ethernet interfaces.
¡ To configure such an Ethernet interface as a Layer 2 interface, set its link mode to bridge.
¡ To configure such an Ethernet interface as a Layer 3 interface, set its link mode to route.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Configure the link mode of the Ethernet interface.
port link-mode { bridge | route }
By default, an Ethernet interface operates in Layer 2 mode.
|
|
CAUTION: After you change the link mode of an Ethernet interface, all commands (except the description, duplex, jumboframe enable, speed, port fec mode, and shutdown commands) on the Ethernet interface are restored to their defaults in the new link mode. |
Configuring jumbo frame support
About this task
Jumbo frames are frames larger than 1536 bytes and are typically received by an Ethernet interface during high-throughput data exchanges, such as file transfers.
The Ethernet interface processes jumbo frames in the following ways:
· When the Ethernet interface is configured to deny jumbo frames (by using the undo jumboframe enable command), the Ethernet interface discards jumbo frames.
· When the Ethernet interface is configured with jumbo frame support, the Ethernet interface performs the following operations:
¡ Processes jumbo frames within the specified length.
¡ Discards jumbo frames that exceed the specified length.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Configure jumbo frame support.
jumboframe enable [ size ]
By default, the device allows jumbo frames within 10304 bytes to pass through.
If you set the size argument multiple times, the most recent configuration takes effect.
Configuring physical state change suppression on an Ethernet interface
About this task
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 operations:
· 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 to the CPU.
Restrictions and guidelines
Do not enable this feature on an interface that has spanning tree protocols or Smart Link enabled.
The link-delay and port link-flap protect enable commands are mutually exclusive on an Ethernet interface.
On an interface, you can configure different suppression intervals for link-up and link-down events. If you execute the link-delay command multiple times on an interface, the following rules apply:
· You can configure the suppression intervals for link-up and link-down events separately.
· If you configure the suppression interval multiple times for link-up or link-down events, the most recent configuration takes effect.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Configure physical state change suppression.
link-delay { down | up } [ msec ] delay-time
By default, physical state change suppression is disabled.
Enabling link flapping protection on an interface
About this task
Link flapping on an interface changes network topology and increases the system overhead. For example, in an active/standby link scenario, when interface status on the active link changes between UP and DOWN, traffic switches between active and standby links. To solve this problem, configure this feature on the interface.
With this feature enabled on an interface, when the interface goes down, the system enables link flapping detection. During the link flapping detection interval, if the number of detected flaps reaches or exceeds the link flapping detection threshold, the system shuts down the interface.
Restrictions and guidelines
This feature takes effect only if it is configured in both the system view and interface view.
Any of the following operations can enable link flapping protection:
· Execute the link-flap protect enable batch command in system view, and do not configure link flapping protection on interfaces.
· Execute the link-flap protect enable batch command in system view, and execute the port link-flap protect enable command in interface view.
· Execute the link-flap protect enable command in system view, and execute the port link-flap protect enable command in interface view.
The link-delay and port link-flap protect enable commands are mutually exclusive on an Ethernet interface.
If you execute the link-flap protect enable batch command on an interface with the link-delay command executed, the link-delay command preferentially takes effect.
To bring up an interface that has been shut down by link flapping protection, execute the undo shutdown command.
In the display interface command output, the Link-Flap DOWN value of the Current state field indicates that the interface has been shut down by link flapping protection.
Procedure
1. Enter system view.
system-view
2. Enable link flapping protection globally.
link-flap protect enable [ batch [ interval interval | threshold threshold ] * ]
By default, link flapping protection is disabled on all interfaces.
3. Enter Ethernet interface view.
interface interface-type interface-number
4. Configure link flapping protection on the Ethernet interface.
port link-flap protect { disable | enable [ interval interval | threshold threshold ] * }
By default, link flapping protection is not configured on an interface, and the global link flapping protection configuration applies on the interface.
Configuring FEC
About this task
The forward error correction (FEC) feature corrects packet errors to improve transmission quality. It attaches correction information to a packet at the sending end, and corrects error codes generated during transmission at the receiving end based on the correction information. You can set the FEC mode as needed.
Restrictions and guidelines
This feature is supported only on 25-GE interfaces and 100-GE interfaces.
Make sure you set the same FEC mode for both interfaces of a link.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Set the FEC mode of the Ethernet interface.
4. port fec mode { auto | base-r | none | rs-fec }
By default, the FEC mode of an interface is auto.
Configuring storm suppression
About this task
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.
Procedure
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
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 PFC on an Ethernet interface
Priority-based flow control (PFC) provides a finer flow control mechanism to implement lossless packet transmission on Ethernet. For more information about PFC, see PFC configuration in Layer 2—LAN Switching Configuration Guide.
Setting the statistics polling interval
About this task
By setting the statistics polling interval, you can collect statistics of packets and analyze packets at the specified interval. Based on the interface traffic statistics, you can take traffic control measures promptly to avoid network congestion and service interruption.
· When network congestion is detected, you can set the statistics polling interval to be smaller than 300 seconds (30 seconds when congestion deteriorates). Then, check traffic distribution on interfaces within a short period of time. For data packets that cause congestion, take traffic control measures.
· When the network bandwidth is sufficient and services are operating normally, you can set the statistics polling interval to be greater than 300 seconds. Once traffic parameter anomalies occur, modify the statistics polling interval promptly so that you can observe the traffic parameter trend in real time.
To display the interface statistics collected in the last statistics polling interval, use the display interface command. To clear the interface statistics, use the reset counters interface command.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Set the statistics polling interval for the Ethernet interface.
flow-interval interval
By default, the statistics polling interval is 300 seconds.
Enabling loopback testing on an Ethernet interface
About this task
Perform this task to determine whether an Ethernet link works correctly.
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.
Restrictions and guidelines
· After you enable this feature on an Ethernet interface, the interface does not forward data traffic.
· The shutdown and loopback commands are mutually exclusive.
· 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.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Enable loopback testing.
loopback internal
Configuring interface alarm functions
About this task
With the interface alarm functions enabled, when the number of error packets on an interface in normal state within the specified interval exceeds the upper threshold, the interface generates an upper threshold exceeding alarm and enters the alarm state. When the number of error packets on an interface in the alarm state within the specified interval drops below the lower threshold, the interface generates a recovery alarm and restores to the normal state.
Restrictions and guidelines
You can configure the interface alarm parameters in system view and interface view.
· The configuration in system view takes effect on all interfaces. The configuration in interface view takes effect only on the current interface.
· For an interface, the configuration in interface view takes priority, and the configuration in system view is used only when no configuration is made in interface view.
An interface that is shut down because of error packet alarms cannot automatically recover. To bring up the interface, execute the undo shutdown command on the interface.
Enabling interface alarm functions
1. Enter system view.
system-view
2. Enable alarm functions for the interface monitoring module.
snmp-agent trap enable ifmonitor [ crc-error | input-error ] *
By default, all alarm functions are enabled for interfaces.
Configuring CRC error packet parameters
1. Enter system view.
system-view
2. Configure global CRC error packet alarm parameters.
ifmonitor crc-error slot slot-number high-threshold high-value low-threshold low-value interval interval [ shutdown ]
By default, the upper threshold is 1000, the lower threshold is 100, and the statistics collection and comparison interval is 10 seconds for CRC error packets.
3. Enter Ethernet interface view.
interface interface-type interface-number
4. Configure CRC error packet alarm parameters for the interface.
port ifmonitor crc-error [ ratio ] high-threshold high-value low-threshold low-value interval interval [ shutdown ]
By default, an interface uses the global CRC error packet alarm parameters.
Configuring input error packet alarm parameters
1. Enter system view.
system-view
2. Configure global input error packet alarm parameters.
ifmonitor input-error slot slot-number high-threshold high-value low-threshold low-value interval interval [ shutdown ]
By default, the upper threshold is 1000, the lower threshold is 100, and the statistics collection and comparison interval is 10 seconds for input error packets.
3. Enter Ethernet interface view.
interface interface-type interface-number
4. Configure input error packet alarm parameters for the interface.
port ifmonitor input-error high-threshold high-value low-threshold low-value interval interval [ shutdown ]
By default, an interface uses the global input error packet alarm parameters.
Restoring the default settings for an interface
Restrictions and guidelines
|
|
CAUTION: This feature might interrupt ongoing network services. Make sure you are fully aware of the impacts of this feature when you use it in a live network. |
This feature 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 check for these commands and perform their undo forms or follow the command reference to restore their default settings. If your restoration attempt still fails, follow the error message to resolve the problem.
For information about the default command, see Interface Command Reference.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Restore the default settings for the interface.
default
Configuring a Layer 3 Ethernet interface
Setting the MTU for an Ethernet interface
About this task
The maximum transmission unit (MTU) determines the maximum number of bytes in a single IP packet that can be sent. The length of an IP packet refers to the number of bytes starting from the IP header to the payload.
When the IP layer receives an IP data packet to be sent, the IP layer determines the local destination interface of the packet and obtains the MTU of the interface. The IP layer compares the MTU with the length of the data packet to be sent. If the length is greater than the MTU, the IP layer fragments the packet. The length of a fragment can be smaller than or equal to the MTU to ensure that big packets are not lost on the network.
As a best practice, use the default MTU. When the packet length or the packet receiver changes, you can adjust the MTU as needed. When configuring the MTU, follow these restrictions and guidelines:
· If the configured MTU is small but the packet length is large, the following events might occur:
¡ Packets will be dropped when they are forwarded by hardware.
¡ Packets will be fragmented into too many fragments when packets are forwarded through the CPUs, which affects normal data transmission.
· If the configured MTU is too large, the MTU will exceed the receiving capabilities of the receiver or a device along the transmission path. As a result, packets will be fragmented or even dropped, which increases the network transmission load and affects data transmission.
Restrictions and guidelines
The 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.
Procedure
1. Enter system view.
system-view
2. Enter interface view.
interface interface-type interface-number
3. Set the interface MTU.
mtu size
The default setting is 1500 bytes.
Verifying and maintaining Ethernet interfaces
Displaying the configuration and running status of Ethernet interfaces
Perform all display tasks in any view.
· Display the running status and related information of the specified interfaces.
display interface [ interface-type [ interface-number ] ] [ brief [ description | down ] ]
· Display link flapping protection information on the specified interfaces.
display link-flap protection [ interface interface-type [ interface-number ] ]
· Display PFC information on the specified interfaces.
display priority-flow-control interface [ interface-type [ interface-number ] ]
Displaying and clearing Ethernet interface statistics
Displaying Ethernet interface statistics
Perform all display tasks in any view.
· Display interface traffic statistics.
display counters { inbound | outbound } interface [ interface-type [ interface-number | interface-number.subnumber ] ]
For information about this command, see common interface commands in Interface Command Reference.
· 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 | interface-number.subnumber ] ]
For information about this command, see common interface commands in Interface Command Reference.
Clearing Ethernet interface statistics
Perform all clear tasks in user view.
· Clear Ethernet interface statistics.
reset counters interface [ interface-type [ interface-number ] ]
For information about this command, see common interface commands in Interface Command Reference.
Displaying and clearing Ethernet module statistics
Displaying Ethernet module statistics
To display the Ethernet module statistics, execute the following command in any view:
display ethernet statistics slot slot-number
Clearing Ethernet module statistics
To clear the Ethernet module statistics, execute the following command in user view:
reset ethernet statistics [ slot slot-number ]
Displaying and clearing physical link state change statistics of interfaces
Displaying physical link state change statistics of interfaces
To display physical link state change statistics of interfaces, execute the following command in any view:
display link-state-change statistics interface [ interface-type [ interface-number ] ]
Clearing physical link state change statistics of interfaces
To clear physical link state change statistics of interfaces, execute the following command in user view:
reset link-state-change statistics interface [ interface-type [ interface-number ] ]
