H3C Technologies H3C S7500E Series Switches - Manual (Page 29)

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operates on the port according to the pre-configured loopback detection action, sends trap
messages and log information to the terminals, and deletes the corresponding MAC address
forwarding entry.
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
Configure the interval for port
loopback detection
loopback-detection interval-time
time
Optional
30 seconds by default
Enter Ethernet
port view
interface interface-type
interface-number
Enter Ethernet
port view or port
group view
Enter port
group view
port-group manual
port-group-name
Use either command
Configurations made in Ethernet
port view takes effect on the
current port only; configurations
made in port group view takes
effect on all ports in the port group
Enable loopback detection on a
port
loopback-detection enable
Required
Disabled by default
Enable loopback detection control
on a trunk port or a hybrid port
loopback-detection control
enable
Optional
Disabled by default
Enable loopback detection in all
the VLANs permitted on the trunk
or hybrid port
loopback-detection per-vlan
enable
Optional
Enabled only in the default
VLAN(s) with trunk port or hybrid
ports
Specify actions to be taken on a
port when a loop is detected on it
loopback-detection action
{ shutdown | semi-block |
no-learning }
Optional
By default, the port does not
specify loopback detection actions.