User's Manual

The line numbers appearing in the status line continue consecutively.
However, as indicated earlier, the log never contains more than 1,000
consecutive lines. For example, if the status line reads
Log events on screen 3378–3397,in memory 2845–3844. Press ’?’ for help.”
then there are 1,000 lines in the log (it is full) and line 3378 (the 534th
line in the current log contents) is at the top of the display.
The router maintains the event log in a reserved area of memory that is
not affected by software reboots. This means that any reboot under
software control (the Boot command, TFTP updates, and ‘‘fatal
exceptions’’) preserves previous log entries. New entries are simply
appended to the existing list and old entries over the 1,000-line limit are
dropped.
However, the event log will be erased if either of the following occurs:
The router is cleared or reset using the Clear and/or Reset buttons.
A fatal exception occurs while the Automatic Reboot parameter is
set to No.
Power to the router is interrupted.
Note
If a fatal exception occurs, the event log will be maintained only if the
Automatic Reboot parameter in the Global Parameters screen is set to
Yes (the default). (If this parameter is set to ‘‘No’’, then it is necessary to
reboot the router by using the Reset button, which clears the event log.
To locate Automatic Reboot in the parameter hierarchy, refer to the
‘‘Parameter Locator’’ in the appendix to the Operator’s Reference. To
learn more about Automatic Reboot, refer also to the Operator’s
Reference.
Note When the router goes down under software control, it enters this event
and the reason for it in the event log. It repeats this entry when the
router reboots, giving you information about the event in cases where
the existing log is lost after the router goes down. This happens in
instances where the router was cleared or reset as described above after
going down under software control.
How To Use the Event Log
Entering and Navigating in the Event Log Display
5-6