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21-105
Cisco MDS 9000 Family Command Reference
OL-16217-01, Cisco MDS SAN-OS Release 3.x
Chapter 21 S Commands
system health serdes-loopback
system health serdes-loopback
To explicitly run an internal Online Health Management System (OHMS) Serializer/Deserializer
(Serdes) loopback test on demand (when requested by the user) for a Fibre Channel interface, use the
system health serdes-loopback command.
system health serdes-loopback interface 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 Loopback is disabled.
The frame-length is 0. The frame-count is 1.
Command Modes EXEC mode.
Command History
Usage Guidelines None.
Examples The following example performs a Serdes loopback test within ports for an entire module.
switch# system health serdes-loopback interface fc 4/1
interface Configures an interface.
fc slot/port (Optional) Configures the Fiber Channel interface specified by the 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.
force Directs the software to use the non-interactive loopback mode.
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
3.0(1) This command was introduced.
3.1(2) Added the interface bay | ext option.
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