3Com WX3000 operation manual Setting Loopback Detection for an Ethernet Port

configuration command once on one port and that configuration will apply to all ports in the port group. This effectively reduces redundant configurations.

A Port group could be manually created by users. Multiple Ethernet ports can be added to the same port group but one Ethernet port can only be added to one port group.

Follow these steps to configure a port group:

To do…	Use the command…	Remarks
Enter system view	system-view	—
Create a port group or enter the specified port	port-group group-id	Required
group view
Add an Ethernet port to a specified port group	port interface-list	Required

A port can not be added to a port group if it has been added to an aggregation group, and vice versa.

Setting Loopback Detection for an Ethernet Port

Loopback detection is used to monitor if loopback occurs on a port.

After you enable loopback detection on Ethernet ports, the device can monitor if external loopback occurs on them. If there is a loopback port found, the device will put it under control.

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If loopback is found on an access port, the system disables the port, sends a Trap message to the client and removes the corresponding MAC forwarding entry.

If loopback is found on a trunk or hybrid port, the system sends a Trap message to the client. When the loopback port control function is enabled on these ports, the system disables the port, sends a Trap message to the client and removes the corresponding MAC forwarding entry.

Follow these steps to set loopback detection for an Ethernet port:

To do…		Use the command…	Remarks
Enter system view		system-view	—
Enable loopback detection			Required
		loopback-detection enable	By default, loopback detection
globally
			is disabled globally.
Set time interval for port		loopback-detection	Optional
			The default interval is 30
loopback detection		interval-time time
			seconds.
Enter Ethernet port view		interface interface-type	—
		interface-number
Enable loopback detection on a			Required
		loopback-detection enable	By default, port loopback
specified port			detection is disabled.
Enable loopback port control on		loopback-detection control	Optional
			By default, loopback port
the trunk or hybrid port		enable
			control is not enabled.
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