R0106-HP MSR Router Series Layer 2 - LAN Switching Command Reference(V7)

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loopback-detection action
Use loopback-detection action to configure the loop protection action on a per-port basis.
Use undo loopback-detection action to restore the default.
Syntax
loopback-detection action { block | no-learning | 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
Predefined user roles
network-admin
Parameters
block: Enables the block mode. If a loop is detected, the device performs the following tasks:
• Generates a log.
• Disables MAC address learning.
• Blocks inbound traffic on the port.
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.
shutdown: Enables the shutdown mode. If a loop is detected, the device generates a log and shuts down
the port. The device automatically sets the port to the forwarding state after the time interval configured
by using the shutdown-interval command (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 2/1/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 2/1/1
[System-GigabitEthernet2/1/1] 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 per-port basis.
Use undo loopback-detection enable to disable loop detection on a port.