Login
- Table of Contents
- Related Documents
-
| Title | Size | Download |
|---|---|---|
| 02-Ethernet Interface Configuration | 77.48 KB |
Table of Contents
1 Ethernet Interface Configuration
General Ethernet Interface Configuration
Configuring Basic Settings of an Ethernet Interface
Configuring Flow Control on an Ethernet Interface
Configuring Loopback Testing on an Ethernet Interface
Configuring a Layer 2 Ethernet Interface
Layer 2 Ethernet Interface Configuration Task List
Setting the Interface Statistics Polling Interval
Enabling Loopback Detection on an Ethernet Interface
Displaying and Maintaining an Ethernet Interface
l The models listed in this document are not applicable to all regions. Please consult your local sales office for the models applicable to your region.
l Support of the H3C WA series WLAN access points (APs) for features may vary by AP model. For more information, see Feature Matrix.
l The interface types and the number of interfaces vary by AP model.
This chapter includes these sections:
l General Ethernet Interface Configuration
l Configuring a Layer 2 Ethernet Interface
l Displaying and Maintaining an Ethernet Interface
General Ethernet Interface Configuration
Layer-2 Ethernet interfaces are physical interfaces operating at the data link layer, processing Layer-2 protocols, and implementing Layer-2 fast forwarding. This document describes Layer-2 Ethernet interface attributes and configuration on the AP.
Configuring Basic Settings of an Ethernet Interface
You can set an Ethernet interface to operate in one of the following duplex modes:
l Full-duplex mode (full). Interfaces operating in this mode can send and receive packets simultaneously.
l Half-duplex mode (half). Interfaces operating in this mode cannot send and receive packets simultaneously.
l Auto-negotiation mode (auto). Interfaces operating in this mode negotiate a duplex mode with their peers.
Similarly, you can set the speed of an Ethernet interface or enable it to automatically negotiate a speed with its peer by using the speed auto command.
Follow these steps to configure the basic settings of an Ethernet interface:
|
To do… |
Use the command… |
Remarks |
|
Enter system view |
system-view |
— |
|
Enter Ethernet interface view |
interface interface-type interface-number |
— |
|
Change the description of the interface |
description text |
Optional By default, the description of an interface is the interface name followed by character string Interface. For example, Ethernet1/0/1 Interface. |
|
Set the duplex mode |
duplex { auto | full | half } |
Optional auto by default. Optical interfaces do not support the half keyword. |
|
Set the port speed |
speed { 10 | 100 | 1000 | auto } |
Optional auto by default. l Optical interfaces do not support the 10 or 100 keyword. l Support for the 1000 keyword varies with AP models. |
|
Shut down the Ethernet interface |
shutdown |
Optional By default, an Ethernet interface is in the up state. To bring up an Ethernet interface, use the undo shutdown command. |
Configuring Flow Control on an Ethernet Interface
You can avoid packet drops on a link by enabling flow control at both ends of the link. When traffic congestion occurs at the receiving end, the receiving end sends a Pause frame to ask the sending end to suspend sending packets. In this way, flow control helps avoid packet drops.
Follow these steps to enable flow control on an Ethernet interface:
|
To do… |
Use the command… |
Remarks |
|
Enter system view |
system-view |
— |
|
Enter Ethernet interface view |
interface interface-type interface-number |
— |
|
Enable flow control |
flow-control |
Required Disabled by default |
Configuring Loopback Testing on an Ethernet Interface
If an Ethernet interface does not work normally, you can enable loopback testing on it to identify the problem. There are two types of loopback testing:
l Internal loopback testing, which tests all on-chip functions related to the Ethernet interfaces.
l External loopback testing, which tests the hardware of Ethernet interfaces. To perform external loopback testing on an Ethernet interface, connect a loopback plug to the Ethernet interface. The AC sends test packets out the interface, which are expected to loop over the plug and back to the interface. If the interface fails to receive any test packet, the hardware of the interface is faulty.
Ethernet interfaces cannot forward data packets during loopback testing.
Follow these steps to enable loopback testing on an Ethernet interface:
|
To do… |
Use the command… |
Remarks |
|
Enter system view |
system-view |
— |
|
Enter Ethernet interface view |
interface interface-type interface-number |
— |
|
Enable loopback testing |
loopback { external | internal } |
Optional Disabled by default. |
l On an interface that is physically down, you can perform only internal loopback testing. On an interface administratively shut down, you can perform neither internal nor external loopback testing.
l The speed, duplex, and shutdown commands are unavailable during loopback testing.
l During loopback testing, an Ethernet interface works in full duplex mode. When you disable loopback testing, the duplex setting of the interface restores.
Configuring a Layer 2 Ethernet Interface
Layer 2 Ethernet Interface Configuration Task List
Complete these tasks to configure a Layer 2 Ethernet interface:
|
Task |
Remarks |
|
Optional Applicable to Layer 2 Ethernet interfaces |
|
|
Optional Applicable to Layer 2 Ethernet interfaces |
|
|
Optional Applicable to Layer 2 Ethernet interfaces |
Configuring Storm Suppression
You can use the storm suppression function to limit the size of a particular type of traffic (currently broadcast, multicast and unknown unicast traffic) on Ethernet interfaces in Ethernet interface view. When the broadcast, multicast, or unknown unicast traffic on the interface exceeds the threshold, the system discards packets until the traffic drops below the threshold.
Follow these steps to set storm suppression thresholds on an Ethernet interface:
|
To do… |
Use the command… |
Remarks |
|
Enter system view |
system-view |
— |
|
Enter Ethernet interface view |
interface interface-type interface-number |
Settings made in Ethernet interface view take effect on the current interface only. |
|
Set the broadcast storm suppression threshold |
broadcast-suppression { ratio | pps max-pps } |
Optional By default, broadcast traffic is not suppressed. |
|
Set the multicast storm suppression threshold |
multicast-suppression { ratio | pps max-pps } |
Optional By default, multicast traffic is not suppressed. |
|
Set the unknown unicast storm suppression threshold |
unicast-suppression { ratio | pps max-pps } |
Optional By default, unknown unicast traffic is not suppressed. |
Setting the Interface Statistics Polling Interval
Follow these steps to set the interface statistics polling interval:
|
To do… |
Use the command… |
Remarks |
|
Enter system view |
system-view |
— |
|
Set the interface statistics polling interval |
flow-interval interval |
Optional The default interface statistics polling interval is 300 seconds |
In system view, you configure a statistics polling interval for all interfaces.
Enabling Loopback Detection on an Ethernet Interface
If an interface receives a packet that it sent out, a loop has occurred. Loops may cause broadcast storms, which degrade network performance. You can enable loopback detection to detect loops on an interface and, if the interface supports the loopback-detection action command, configure the protective action to take on the interface when a loop is detected, for example, to shut down the interface. Depending on whether a protective action is configured, the AP takes the actions in Table 1-1 to alleviate the impact of the loop condition.
Table 1-1 Actions taken upon detection of a loop condition
|
Port type |
Actions |
|
|
No protective action configured |
A protective action configured |
|
|
Access port |
l Place the interface in controlled mode. The interface discards all incoming packets, but still forwards outgoing traffic. l Generate traps. l Delete all MAC address entries of the interface. |
l Perform the configured protective action. l Generate traps and log messages. l Delete all MAC address entries of the interface. |
|
Hybrid or trunk port |
l Generate traps. l If loopback detection control is enabled, set the interface in controlled mode. The interface discards all incoming packets, but still forwards outgoing packets. l Delete all MAC address entries of the interface. |
l Create traps and log messages. l If loopback detection control is enabled, take the configured protective action on the interface. l Delete all MAC address entries of the interface. |
Follow these steps to configure loopback detection:
|
To do… |
Use the command… |
Remarks |
|
Enter system view |
system-view |
— |
|
Enable global loopback detection |
loopback-detection enable |
Required Disabled by default |
|
Set the loopback detection interval |
loopback-detection interval-time time |
Optional 30 seconds by default |
|
Enter Ethernet interface view |
interface interface-type interface-number |
— |
|
Enable loopback detection control on a trunk or hybrid port |
loopback-detection control enable |
Optional Disabled by default |
l To use loopback detection on an Ethernet interface, you must enable the function both globally and on the interface.
l To disable loopback detection on all interfaces, run the undo loopback-detection enable command in system view.
l To enable a hybrid or trunk port to take the administratively specified protective action, you must perform the loopback-detection control enable command on the port.
Displaying and Maintaining an Ethernet Interface
|
To do… |
Use the command… |
Remarks |
|
Display the current state of an interface and the related information |
display interface [ interface-type [ interface-number | interface-number.subnumber ] ] |
Available in any view |
|
Display the summary information of an interface |
display brief interface [ interface-type [ interface-number | interface-number.subnumber ] ] [ | { begin | exclude | include } regular-expression ] |
Available in any view |
|
Clear the statistics of an interface |
reset counters interface [ interface-type [ interface-number | interface-number.subnumber ] ] |
Available in user view |
|
Display the information about the loopback function |
display loopback-detection |
Available in any view |
