10
Table 1 Actions to take upon detection of a loop condition
Port type
Actions
No protective action is configured
A protective action is configured
Access port
•
Place the receiving interface in controlled
mode. The interface does not receive or
send packets.
•
Generate traps and log messages.
•
Delete all MAC address entries of the
interface.
•
Perform the configured protective
action.
•
Generate traps and log
messages.
•
Delete all MAC address entries of
the interface.
Hybrid or
trunk port
•
Generate traps and log messages.
•
If loopback detection control is enabled,
place the receiving interface in controlled
mode. The interface does not receive or
send packets.
•
Delete all MAC address entries of the
interface.
•
Generate traps and log
messages.
•
If loopback detection control is
enabled, take the configured
protective action on the interface.
•
Delete all MAC address entries of
the interface.
Configuration restrictions and guidelines
•
To use loopback detection on an Ethernet interface, you must enable the function both globally
and on the interface.
•
When you enable multi-port loopback detection on a switch, both single-port and multi-port
loops can be detected.
•
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
.
Configuration procedure
To configure loopback detection:
Step Command Remarks
1.
Enter system view.
system-view
N/A
2.
Enable global
loopback detection.
loopback-detection enable
Disabled by default.
3.
Enable multi-port
loopback detection.
loopback-detection
multi-port-mode enable
Optional.
By default, multi-port loopback detection is
disabled, and the device can only detect
single-port loopback.
4.
Set the loopback
detection interval.
loopback-detection
interval-time time
Optional.
30 seconds by default.