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21-90
Cisco MDS 9000 Family Command Reference
OL-8413-07, Cisco MDS SAN-OS Release 3.x
Chapter 21 S Commands
system health external-loopback
system health external-loopback
To explicitly run an external Online Health Management System (OHMS) loopback test on demand
(when requested by the user) for a specified interface or module, use the system health
external-loopback command.
system health external-loopback {interface fc slot/port | source interface fc slot/port destination
fc slot/port} [frame-length bytes [frame-count number] | frame-count number] [force]
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
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.
source Specifies the source Fibre Channel interface.
destination Specifies the destination Fibre Channel interface.
bay | 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.
force Directs the software to use the non-interactive loopback mode.
Release Modification
1.3(4) This command was introduced.
3.0(1) Added the source and destination keywords and the frame-count and
frame-length options.
3.1(2) Added the interface bay | ext option.
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