Loopback-Detection Control Enable; Loopback-Detection Enable - H3C S5120-SI Series Command Reference Manual

Examples
# Enable internal loopback testing on port GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] loopback internal
Loop internal succeeded!

loopback-detection control enable

Syntax
loopback-detection control enable
undo loopback-detection control enable
View
Ethernet interface view, port group view
Default level
2: System level
Parameters
None
Description
Use the loopback-detection control enable command to enable loopback detection control on trunk or
hybrid ports.
Use the undo loopback-detection control enable command to restore the default.
By default, loopback detection control is disabled on trunk and hybrid ports.
When a hybrid or trunk port detects a loop condition, it sends traps, whether loopback detection control
is enabled or not. However, only after loopback detection control is enabled, will the port discard all
inbound packets on the port while normally forwarding outbound packets on it. Meanwhile, the device
sends trap messages to the terminal, and deletes the corresponding MAC address forwarding entry
This command is not applicable to access ports.
Examples
# Enable loopback detection control on trunk port GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] loopback-detection enable
[Sysname] interface gigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] port link-type trunk
[Sysname-GigabitEthernet1/0/1] loopback-detection enable
[Sysname-GigabitEthernet1/0/1] loopback-detection control enable

loopback-detection enable

Syntax
loopback-detection enable
undo loopback-detection enable
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