H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 16)

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• The speed, duplex, mdi, and shutdown commands are not available during loopback testing.
• During loopback testing, the Ethernet interface operates in full duplex mode. When you disable
loopback testing, the port returns to its duplex setting.
• Loopback testing is a one-time operation, and is not recorded in the configuration file.
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.
Configuring jumbo frame support
An Ethernet interface might receive some frames larger than the standard Ethernet frame size (called
"jumbo frames") during high-throughput data exchanges such as file transfers. Usually, an Ethernet
interface discards jumbo frames. With jumbo frame support enabled, the interface can process frames
larger than the standard Ethernet frame size yet within the specified range.
In Ethernet interface view or port group view, you can set the length of jumbo frames that are allowed to
pass through Ethernet interfaces, as follows:
• If you execute the command in Ethernet interface view, the configuration takes effect only on the
interface.
• If you execute the command in port group view, the configuration takes effect on all ports in the port
group.
To configure jumbo frame support in interface view or port group view:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view or port
group view.
• Enter Ethernet interface view:
interface interface-type
interface-number
• Enter port group view:
port-group manual
port-group-name
Settings in interface view take effect on
the interface. Settings in port group
view take effect on all ports in the port
group.
3. Configure jumbo frame
support.
jumboframe enable [ value ]
By default, the switch allows jumbo
frames within 10000 bytes to pass
through all Ethernet interfaces.
When you configure the value
argument multiple times, the most
recent configuration takes effect.