Configuration restrictions and guidelines, Configuration procedure, Table 1 – H3C Technologies H3C WX5500E Series Access Controllers User Manual
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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 discards all incoming
packets, but still forwards outgoing 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 discards all incoming
packets, but still forwards outgoing 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.
•
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
By default, global loopback
detection is disabled.
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.
The default setting is 30 seconds.