APC Computer Accessories Apc Switched PDU User Manual

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USER’S GUIDE
Switched Rack PDU
14
Watchdog Features
Overview
To detect internal problems and recover from unanticipated inputs, the Rack
PDU uses internal, system-wide watchdog mechanisms. When it restarts
itself to recover from an internal problem, a System: Warmstart event is
recorded in the event log.
Network interface watchdog mechanism
The Rack PDU implements internal watchdog mechanisms to protect itself
from becoming inaccessible over the network. For example, if the Rack
PDU does not receive any network traffic for 9.5 minutes (either direct
traffic, such as SNMP, or broadcast traffic, such as an Address Resolution
Protocol [ARP] request), it assumes that there is a problem with its network
interface and restarts itself.
Resetting the network timer
To ensure that the Rack PDU does not restart if the network is quiet for 9.5
minutes, the Rack PDU attempts to contact the Default Gateway every 4.5
minutes. If the gateway is present, it responds to the Rack PDU, and that
response restarts the 9.5-minute timer. If your application does not require
or have a gateway, specify the IP address of a computer that is running on
the network most of the time and is on the same subnet. The network traffic
of that computer will restart the 9.5-minute timer frequently enough to
prevent the Rack PDU from restarting.

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