Specifications

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Chapter 12 Command Line Interface Reference
interface fc? loopback
interface fc? loopback
To initiate a loopback test on the named Fibre Channel (FC) interface, use the interface fc? loopback
command.
interface fc? loopback {external | internal | online}
Syntax Description
Defaults None.
Command Modes Administrator.
Command History
Usage Guidelines Loopback tests are part of standard diagnostic procedures. To display the results or status of a loopback
test, use the show interface fc? command.
Before performing a loopback test, the named FC interface must be in the correct state.
• For online loopback testing, the FC interface must be enabled. Use the interface fc? enable
command to enable the FC interface before performing online loopback testing.
• For external or internal loopback testing, the FC interface must be in a diagnostic state. Use the
interface fc? diag command to set the FC interface into a diagnostic state before performing
external or internal loopback testing.
Examples The following example sets the FC interface fc6 into a diagnostic state and then performs an internal
loopback test:
[SN5428-2A]# interface fc6 diag
[SN5428-2A]# interface fc6 loopback internal
fc? The name of the FC interface to be tested. Valid values are fc1 through fc8.
When you type the interface fc? command, the CLI lists the interfaces
available. You cannot specify a nonexistent interface.
external Keyword, indicating an external loopback test will be performed. The FC
interface must be in a diagnostic state.
internal Keyword, indicating an internal loopback test will be performed. The FC
interface must be in a diagnostic state.
online Keyword, indicating an online loopback test will be performed. The FC
interface must be enabled.
Release Modification
3.2.1 This command was introduced.