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21-92
Cisco MDS 9000 Family Command Reference
OL-8413-07, Cisco MDS SAN-OS Release 3.x
Chapter 21 S Commands
system health internal-loopback
system health internal-loopback
To explicitly run an internal Online Health Management System (OHMS) loopback test on demand
(when requested by the user) for a specified interface or module, use the system health
internal-loopback command.
system health internal-loopback interface {fc slot/port | iscsi slot/port} [frame-length bytes
[frame-count number] | frame-count number]
Note On a Cisco Fabric Switch for HP c-Class BladeSystem and on a Cisco Fabric Switch for IBM
BladeCenter, the syntax differs as follows:
interface {bay port | ext port}
Syntax Description
Defaults The loopback is disabled.
The frame-length is 0. The frame-count is 1.
Command Modes EXEC mode.
Command History
Usage Guidelines Internal loopback tests send and receive FC2 frames to and from the same ports and provide the round
trip time taken in microseconds for the Fibre Channel interface.
interface Configures an interface.
fc slot/port (Optional) Configures the Fibre Channel interface specified by the slot
and port on an MDS 9000 Family switch.
iscsi slot/port (Optional) Specifies the iSCSI interface to configure by slot and port on
an MDS 9000 Family switch.
bay port | ext port (Optional) Configures the Fibre Channel interface on a Cisco Fabric
Switch for HP c-Class BladeSystem or on a Cisco Fabric Switch for
IBM BladeCenter . The range is 0 to 48.
frame-length bytes Configures the specified length of the loopback test frame in bytes. The
range is 0 to 128 bytes.
frame-count number Configures the specified number of frames for the loopback test. The
number of frames can range from 1 to 32.
Release Modification
1.3(4) This command was introduced.
3.0(1) Added the frame-count and frame-length options.
3.1(2) Added the interface bay | ext option.
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