Loopback-Detection Control Enable - HP 3600 v2 Series Command Reference Manual

Parameters
no-learning: Disables MAC address learning on the interface.
semi-block: Blocks all packets but STP BPDUs, and disables MAC address learning on the interface.
shutdown: Shuts down the Ethernet interface. To bring up the interface again, use the undo shutdown
command.
Description
Use loopback-detection action to configure the action for loop protection on Ethernet interfaces.
Use undo loopback-detection action to restore the default.
By default, a looped interface drops the incoming packets and correctly sends packets; the system
generates traps and log messages, and deletes the MAC address table entries of the looped interface.
When you change the link type of an Ethernet interface by using the port link-type command, the switch
removes the protective action configured on the interface. For more information about the port link-type
command, see
Examples
# Configure the access port Ethernet 1/0/1 to shut down when a loop is detected.
<Sysname> system-view
[Sysname] loopback-detection enable
[Sysname] interface ethernet 1/0/1
[Sysname-Ethernet1/0/1] loopback-detection enable
[Sysname-Ethernet1/0/1] loopback-detection action shutdown
# Configure the trunk port Ethernet 1/0/2 to shut down when a loop is detected.
<Sysname> system-view
[Sysname] loopback-detection enable
[Sysname] interface ethernet 1/0/2
[Sysname-Ethernet1/0/2] port link-type trunk
[Sysname-Ethernet1/0/2] loopback-detection enable
[Sysname-Ethernet1/0/2] loopback-detection control enable
[Sysname-Ethernet1/0/2] loopback-detection action shutdown

loopback-detection control enable

Syntax
loopback-detection control enable
undo loopback-detection control enable
View
Layer 2 Ethernet interface view, port group view
Default level
2: System level
Parameters
None
Description
Use loopback-detection control enable to enable loopback detection control on trunk or hybrid ports.
"VLAN configuration commands."
33