S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
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Cisco MDS 9000 Family CLI Configuration Guide
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Chapter 59 Monitoring System Processes and Logs
Online System Health Management
To configure the frequency of loopback tests for all modules on a switch, follow these steps:
Loopback Test Configuration Frame Length
Loopback tests are designed to identify hardware errors in the data path in the module(s) and the control
path in the supervisors. One loopback frame is sent to each module at a preconfigured size—it passes
through each configured interface and returns to the supervisor module.
The loopback tests can be run with frame sizes ranging from 0 bytes to 128 bytes. If you do not configure
the loopback frame length value, the switch generates random frame lengths for all modules in the switch
(auto mode). Loopback test frame lengths can be altered for each module.
To configure the frame length for loopback tests for all modules on a switch, follow these steps:
To verify the loopback frequency configuration, use the
show system health loopback frame-length
command.
switch#
show system health loopback frame-length
Loopback frame length is set to auto-size between 0-128 bytes
Hardware Failure Action
The failure-action command controls the Cisco SAN-OS software from taking any action if a hardware
failure is determined while running the tests.
By default, this feature is enabled in all switches in the Cisco MDS 9000 Family—action is taken if a
failure is determined and the failed component is isolated from further testing.
Failure action is controlled at individual test levels (per module), at the module level (for all tests), or
for the entire switch.
Command
Purpose
Step 1
switch#
config terminal
switch(config)#
Enters configuration mode.
Step 2
switch(config)#
system health loopback
frequency 50
The new frequency is set at 50 Seconds.
Configures the loopback frequency to 50 seconds.
The default loopback frequency is 5 seconds. The
valid range is from 5 to 255 seconds.
Command
Purpose
Step 1
switch#
config terminal
switch(config)#
Enters configuration mode.
Step 2
switch(config)#
system health loopback
frame-length 128
Configures the loopback frame length to 128
bytes. The valid range is 0 to 128 bytes.
Step 3
switch(config)#
system health loopback
frame-length auto
Configures the loopback frame length to
automatically generate random lengths (default).
