API Guide

LPC Bus Quality Degradation
LPC Bus Quality Analyzer (LBQA) runs on the system that make use of the LPC bus. It constantly monitors the LPC bus and
alerts or warns the user using following methods when it detects signal degradation:
1. The system displays a high priority syslog message. The text of this syslog is CPU Clock signal has degraded
below acceptable threshold on stack-unit <stack-unit-number> with service tag <service
tag>. Please contact Technical Support. On chassis platforms, the text is CPU Clock signal has
degraded below acceptable threshold on Line card <line card number> with service tag
<service tag>. Please contact Technical Support. This syslog continues to show every 30 minutes. An
SNMP trap with this information is also generated every hour.
2. If SupportAssist is enabled - it sends the event message to the global SupportAssist server immediately and there after once
in two days, so Dell can assist in pro-actively notifying and assisting customers.
3. System Status LED changes to an alarm state, blinking amber for S3048–ON, S6100–ON and Z9100–ON, and solid amber
for C9000. It is not possible to suppress this LED pattern until the unit is switched off (for RMA).
4. The switch (control/management/data plane) continues to be active.
NOTE: This is true even if the unit is the master (in a HA chassis environment – as in the case of RPM) or a Stack
master or standby (as in case of S3048-ON).
LBQA (LPC Bus Quality Analyzer) Failure Detection mode
The following functions are performed as a part of this mode:
1. The LBQA will be started as part of FTOS application init (typically as a poller in sysd).
2. The LBQA will run as a fast poller (typically 1 sec) in failure detection mode.
3. During every fast poll cycle, LBQA will be the first poller to run.
4. In failure detection mode, the LBQA will issue a single IOCTL for each poll interval, which may in-turn issue multiple LPC
operations (write & read-back) to check the sanity of the LPC bus using the scratch register.
5. The LBQA will use an extended walking 1s/0s test along with a pattern based test (0x00, 0x55, 0xAA, 0xFF) that is
staggered across several polls.
6. The LBQA will limit each sanity check to a maximum of 16 operations (read + write).
7. LBQA will use a variable number of sanity checks over time, it would perform at least 1 check during every poll interval but
will perform 8 checks during a signal poll once in 5 seconds.
8. The LBQA can be disabled on a system wide basis (i.e all stack-units or line cards as applicable) through a CLI command.
Reloading the system
You can reload the system using the reload command. To reload the system, follow these steps:
● Reload the system into Dell EMC Networking OS.
EXEC Privilege mode
reload
● Reload the system if a configuration change to the NVRAM requires a device reload.
EXEC Privilege mode
reload conditional nvram-cfg-change
● Reload the system into the Dell diagnostics mode.
EXEC Privilege mode
reload dell-diag
● Reload the system into the ONIE mode.
EXEC Privilege mode
reload onie [install | uninstall | rescue]
Use the install parameter to reload the system and enter the Install mode to install a networking OS.
Use the uninstall parameter to reload the system and enter the Uninstall mode to uninstall a networking OS.
Use the rescue parameter to reload the system and enter the Rescue mode to access the file system.
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Management