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interface that receives the looped packets) is the looped interface. Multi-port loops might also cause
broadcast storms.
Figure 5 Network diagram for multi-port loopback detection
LAN
Port 1 Port 2
Switch A
Loop
The multi-port loopback detection function detects loops among interfaces on your switch. You can use the
loopback-detection action command to configure the protective action to take on looped interfaces— for
example, to shut down the interface, eliminating the loops. In addition, the switch also takes other link
type-dependant actions on the looped interface (for example, Port 1 in Figure 5) to alleviate the impact of
the loop condition. For more information, see ―Setting the statistics polling interval.‖
Multi-port loopback detection is implemented on the basis of single-port loopback detection
configurations on Ethernet interfaces. To implement multi-port loopback detection, you must enable single-
port loopback detection on one or multiple Ethernet interfaces on the switch.
Follow these steps to configure multi-port loopback detection:
Enable multi-port loopback
detection
loopback-detection multi-port-
mode enable
Required
Disabled by default.
NOTE:
To enable multi-port loopback detection, you must configure the loopback-detection multi-port-mode enable
and loopback-detection enable commands in system view, and configure the loopback-detection enable
command in the view of the related interfaces.
The single-port loopback detection function is available when the switch is performing multi-port loopback
detection.
Setting the MDI mode of an Ethernet interface
NOTE:
Optical interfaces do not support the MDI mode setting.
You can use both crossover and straight-through Ethernet cables to connect copper Ethernet interfaces. To
accommodate these types of cables, a copper Ethernet interface can operate in one of the following
Medium Dependent Interface (MDI) modes:
Across mode
Normal mode
Auto mode
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