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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.
Syntax
loopback-detection enable vlan { vlan-id-list | all }
undo loopback-detection enable vlan
{ vlan-id-list | all }
Default
Loop detection is disabled on ports.
Views
Layer 2 Ethernet interface view
Layer 2 aggregate interface view
Predefined user roles
network-admin
Parameters
vlan-id-list: Specifies a space-separated list of up to 10 VLAN items. Each item specifies a
VLAN ID or a range of VLAN IDs in the form of
vlan-id1 to vlan-id2. The value range for VLAN
IDs is 1 to 4094. The ID for
vlan-id2 must be no less than the ID for vlan-id1.
all: Specifies all existing VLANs.
Usage guidelines
To enable loop detection globally, use the loopback-detection global enable command.
The loop protection action on a port can be triggered even if loop detection is disabled on the port
when the following requirements are met:
• Loop detection is enabled globally or on any other port on the device.
• The port receives a loop detection frame of any VLAN.
Example
# Enable loop detection on GigabitEthernet 1/0/1 for VLAN 10 through VLAN 20.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[System-GigabitEthernet1/0/1] loopback-detection enable vlan 10 to 20
Related commands
display loopback-detection
loopback-detection global enable
loopback-detection global action
Use loopback-detection global action to set the global loop protection action.
Use
undo loopback-detection global action to restore the default.
Syntax
loopback-detection global action shutdown
undo loopback-detection global action
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