ZyXEL Communications P-660RU-Tx Series Support Notes page 49

If any link of IDSL or WAN is up, the trap will be sent with the port
number . The port number is its interface index under the interface
group.
5. authenticationFailure (defined in RFC -1215) :
When receiving any SNMP get or set requirement with wrong community,
this trap is sent to the manager.
6. whyReboot (defined in ZYXEL-MIB) :
When the system is going to restart (warmstart), the trap will be sent with the
reason of restart before rebooting.
(1) For intentional reboot:
In some cases (download new files, CI command "sys reboot", ...), reboot is
done intentionally. And traps with the message "System reboot by user !" will
be sent.
(2) For fatal error:
System has to reboot for some fatal errors. And traps with the message of the
fatal code will be sent.
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