H3C Technologies H3C S10500 Series Switches - Manual (Page 25)

14
To do… Use the command… Remarks
Enter Ethernet 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
Use either command.
To configure loopback detection on one
interface, enter Ethernet interface view.
To configure loopback detection on a group of
Ethernet interfaces, enter port group view.
Enable loopback
detection on the
interface
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 on the trunk or
hybrid port
loopback-detection per-vlan
enable
Optional
By default, a trunk or hybrid port performs
loopback detection only in its port VLAN ID
(PVID).
Set the protective action
to take on the interface
when a loop is detected
loopback-detection action
{ no-learning | semi-block |
shutdown }
Optional
By default, a looped interface does not receive
or send packets; the system generates traps and
deletes all MAC address entries of the looped
interface.
With the shutdown keyword specified, the
switch shuts down the looped ports and set their
physical state to Loop down. When a looped
port recovers, you must use the undo shutdown
command to restore its forwarding capability.
NOTE:
•
To use loopback detection on an Ethernet interface, you must enable the function both globally and on
the interface.
• To disable loopback detection on all interfaces, run the undo loopback-detection enable command in
system view.
• To enable a hybrid or trunk port to take the administratively specified protective action, you must use the
loopback-detection control enable command on the port.
• When you change the link type of an Ethernet interface by using the port link-type command, the switch
removes the protective action configured on the interface. For more information about the port link-type
command, see Layer 2—LAN Switching Command Reference.
Setting the MDI mode of an Ethernet interface
NOTE:
Fiber ports do not support the MDI mode setting.