Connectivity Guide

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.
Restoring the Factory Default Settings
Restoring the factory-default settings deletes the existing NVRAM settings, startup configuration, and all configured settings
such as, stacking or fanout.
To restore the factory default settings, use the restore factory-defaults stack-unit {stack—unit—number |
all} {clear-all | nvram | bootvar} command in EXEC Privilege mode.
CAUTION: There is no undo for this command.
Important Points to Remember
● When you restore all the units in a stack, these units are placed in standalone mode.
● When you restore a single unit in a stack, only that unit is placed in standalone mode. No other units in the stack are
affected.
● When you restore the units in standalone mode, the units remain in standalone mode after the restoration.
● After the restore is complete, the units power cycle immediately.
The following example illustrates the restore factory-defaults command to restore the factory default settings.
DellEMC#restore factory-defaults stack-unit 1 nvram
***********************************************************************
* Warning - Restoring factory defaults will delete the existing *
* persistent settings (stacking, fanout, etc.) *
* After restoration the unit(s) will be powercycled immediately. *
* Proceed with caution ! *
***********************************************************************
Proceed with factory settings? Confirm [yes/no]:yes
-- Restore status --
Unit Nvram Config
------------------------
1 Success
Power-cycling the unit(s).
....
Management
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