58 CHAPTER 2: USING PORT COMMANDS
View
Ethernet Port View
Parameter
external: External loop test.
internal: Internal loop test.
Description
Use the loopback command to configure the Ethernet port to perform the
loopback test to check if the Ethernet port works normally. The loop test will finish
automatically after being performed for a while.
By default, the Ethernet port will not perform the loopback test.
Example
To perform the internal loop test for Ethernet1/0/1, enter the following:
<SW5500>system-view
System View: return to User View with Ctrl+Z.
[SW5500]interface Gigabitethernet 1/0/1
[SW5500-GigabitEthernet1/0/1]loopback internal
loopback-detection
control enable
Syntax
loopback-detection control enable
undo loopback-detection control enable
View
Ethernet Port View
Parameter
None
Description
Use the loopback-detection control enable command to enable loopback
detection control function on a Trunk port or Hybrid port. Use the
undo
loopback-detection control enable
command to disable loopback detection
control function on a Trunk port or Hybrid port.
This command controls the operating status of the port, when the loopback
detection function is enabled and lookback is detected on a Trunk or Hybrid port.
When this function is enabled and loopback is detected on a Trunk or Hybrid port,
the system begins to control the operating status of the port. When this function
is disabled and loopback is found, the system just reports a Trap message but has
no control over the operating status of the Trunk or Hybrid port.
By default, the loopback detection control function on Trunk or Hybrid ports is
disabled.
This command has no effect on Access ports.
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