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z If you specify a source aggregation group ID, the system will use the port with the smallest port
number in the aggregation group as the source.
z If you specify a destination aggregation group ID, the configuration of the source port will be copied
to all ports in the aggregation group and all ports in the group will have the same configuration as
that of the source port.
Configuring Loopback Detection for an Ethernet Port
Loopback detection is used to monitor if loopback occurs on a switch port.
After you enable loopback detection on Ethernet ports, the switch can monitor if external loopback
occurs on them. If there is a loopback port found, the switch will put it under control.
z 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.
z 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 configure loopback detection for an Ethernet port:
To do... Use the command... Remarks
Enter system view
system-view
—
Enable loopback detection
globally
loopback-detection enable
Required
By default, loopback detection
is disabled globally.
Set the interval for performing
port loopback detection
loopback-detection
interval-time time
Optional
The default is 30 seconds.
Enter Ethernet port view
interface interface-type
interface-number
—
Enable loopback detection on a
specified port
loopback-detection enable
Required
By default, port loopback
detection is disabled.
Enable loopback port control on
the trunk or hybrid port
loopback-detection control
enable
Optional
By default, loopback port
control is not enabled.
Configure the system to run
loopback detection on all
VLANs of the current trunk or
hybrid port
loopback-detection per-vlan
enable
Optional
By default, the system runs
loopback detection only on the
default VLAN of the current
trunk or hybrid port.