HP MSR2000/3000/4000 Router Series Layer 2 - LAN Switching Command Reference

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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 disables MAC address learning and
blocks inbound traffic on the port, in addition to generating a log.
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.
Usage guidelines
You can configure the loop protection action globally or on specific ports. 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 Ethernet 2/1.
<Sysname> system-view
[Sysname] interface ethernet 2/1
[System-Ethernet2/1] 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.
Syntax
loopback-detection enable vlan { vlan-list | all }
undo loopback-detection enable vlan { vlan-list | all }
Default
The loop detection function is disabled on ports.