Digital diagnostics monitoring (ddm), Disabled master, Dmm (disabled master monitoring) – Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) User Manual
Page 2199
Appendix B: Glossary
Software Reference for x310 Series Switches
C613-50046-01 REV A
AlliedWare Plus
TM
Operating System - Version 5.4.4C
B.9
Digital Diagnostics Monitoring (DDM)
Modern optical SFP transceivers support Digital Diagnostics Monitoring (DDM) functions.
This feature allows you to monitor real-time parameters of the SFP, such as optical output
power, optical input power, temperature, laser bias current, and transceiver supply
voltage. Additionally, RX LOS (Loss of Signal) is shown when the received optical level is
below a preset threshold. Monitoring these parameters allows you to check on the health
of all installed SFPs or a specific SFP transceiver. See also
in
.
SFP transceivers that support DDM display the following output from the
show system pluggable diagnostics
commands for
monitoring SFPs:
■
Diagnostic Calibration: Specifies whether the pluggable supports DDM Internal
Calibration. Internal is displayed if the pluggable supports DDM Internal Calibration.
■
Power Monitoring: Displays the received power measurement type, which can be
either OMA (Optical Module Amplitude) or Avg (Average Power) measured in μW.
For further information about the DDM feature on the switch for installed SFP transceivers,
see the
command and the
command in
Chapter 8, System Configuration and Monitoring
.
Disabled master
The Disabled Master is a variant of the
or
and is used with
DMM (disabled master monitoring)
feature. The Disabled Master has the same
configuration as the
, but has all its switchports disabled.
The Disabled Master is only used is the stack separates into two stubs. By having all
switchports disabled, the Disabled Master avoids potentially detrimental network
connectivity problems from having two Stack Masters or Active Masters having the same
configuration. The Stack Master’s or Active Master’s ports are unaffected by the Disabled
Master’s ports, so the Stack Master or Active Master continues to forward traffic normally.
For information about the Disabled Master and the Disabled Master Monitoring feature,
see the
Disabled Master Monitoring (DMM)
and the
stack disabled-master-monitoring
command in
DLF
Destination Lookup Failure. DLF is the event of receiving a unicast Ethernet frame with an
unknown destination address.
DMM (disabled master monitoring)
The Disabled Master Monitoring (DMM) features checks the status of the Active Master via
the Stack Resiliency Link. If the Active Master fails then the Disabled Master changes state
to Active Master. A Disabled Master has the same configuration as the Active Master, but
has all links shutdown. This change in state for the Disabled Master to become the Active
Master allows traffic forwarding to continue on the VCStack.
For information about the Disabled Master and the Disabled Master Monitoring feature,
see the
Disabled Master Monitoring (DMM)
and the