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Syntax
In Layer 2 Ethernet interface view:
loopback-detection action { block | no-learning | shutdown }
undo loopback-detection action
In Layer 2 aggregate interface view:
loopback-detection action shutdown
undo loopback-detection action
Default
When the device detects a loop on a port, it generates a log but performs no action on the port.
Views
Layer 2 Ethernet interface view, Layer 2 aggregate interface view
Predefined user roles
network-admin
Parameters
block: Enables the block mode. If a loop is detected, the device disables MAC address learning and
blocks inbound traffic on the port, in addition to generating a log. Layer 2 aggregate interfaces do not
support this keyword.
no-learning: Enables the no-learning mode. If a loop is detected, the device generates a log and
disables MAC address learning on the port. Layer 2 aggregate interfaces do not support this
keyword.
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 globally, use the loopback-detection global action
command.
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 loop protection action to shutdown on port GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[System-GigabitEthernet1/0/1] loopback-detection action shutdown
Related commands
• display loopback-detection
• loopback-detection global action
loopback-detection enable
Use loopback-detection enable to enable loop detection on a port.
Use undo loopback-detection enable to disable loop detection on a port.
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