Allied Telesis AT-S97 - Manual (Page 82)

Chapter 5: Port and Module Commands
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opmode Specifies an operating mode for a channel. Available
settings are:
link-test Specifies the Link Test mode. This is the
default setting.
ml Specifies the MissingLink™ mode.
sml Specifies the Smart MissingLink mode.
Privilege Levels
Administrator and read-write.
General Description
This command is used to set the operating modes of the channels on the
media converter modules. Different channels on the same media
converter module can be set to different operating modes. The operating
modes do not interfere with the flow of network traffic through the ports of
a channel. To view a channel’s current operating mode, refer to “SYSTEM
SHOW INTERFACE” on page 103.
Description of the Link Test Mode
Contrary to its name, the Link Test operating mode is not a diagnostic
utility. Rather, it simply reflects the link status of a port on the port’s Link
LED and in the SYSTEM SHOW INTERFACE command. For example,
when a port in a media converter channel running in this mode has a valid
link to a network device, its Link LED is on and its status in the SYSTEM
SHOW INTERFACE command is online. Conversely, when a channel port
operating in this mode does not have a link, its Link LED is off and its
status in the SYSTEM SHOW INTERFACE command is offline.
This mode is typically used when the network devices connected to the
ports of a channel cannot take advantage of the features of the
MissingLink mode, or when you want to use the Link LEDs or the
SYSTEM SHOW INTERFACE command to troubleshoot a network
problem with a channel. This operating mode is also useful after the
installation of a media converter module to verify whether the ports of a
channel have established a link with a network device.
Description of the MissingLink Mode
In the MissingLink mode, the two ports of a channel share their “link”
status with each other so that both ports of a channel and, consequently,
the network devices connected to the ports, are always aware of a change
to the status of the link of the companion port in a channel. When a
channel in the MissingLink mode detects the loss of a link on one of its
ports, it replicates the loss on the companion port in the same channel by