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Parameters
shutdown: Enables the shutdown mode. If a loop is detected, the device generates a log and shuts
down the port. The device automatically brings up the port after the detection timer expires. You can
use the shutdown-interval command to set the detection timer. For more information, see
Fundamentals Command Reference.
Usage guidelines
To configure the loop protection action on a per-port basis, use the loopback-detection action
command in interface view.
The global configuration applies to all ports. The per-port configuration applies to the individual ports.
The per-port configuration takes precedence over the global configuration.
Example
# Set the global loop protection action to shutdown.
<Sysname> system-view
[System] loopback-detection global action shutdown
Related commands
• display loopback-detection
• loopback-detection action
loopback-detection global enable
Use loopback-detection global enable to enable loop detection globally.
Use undo loopback-detection global enable to disable loop detection globally.
Syntax
loopback-detection global enable vlan { vlan-list | all }
undo loopback-detection global enable vlan { vlan-list | all }
Default
The loop detection function is globally disabled.
Views
System view
Predefined user roles
network-admin
Parameters
vlan-list: Specifies a VLAN list, in the format of { vlan-id [ to vlan-id ] }&<1-10>, where vlan-id
represents the VLAN ID in the range of 1 to 4094, and &<1-10> indicates that you can specify up to
10 vlan-id [ to vlan-id ] parameters.
all: Specifies all existing VLANs.
Usage guidelines
To enable loop detection on a per-port basis, use the loopback-detection enable command in
interface view.
The global configuration applies to all ports in the specified VLAN. The per-port configuration applies
to the individual port only when the port belongs to the specified VLAN. The per-port configuration
takes precedence over the global configuration.
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