APC MasterSwitch User's Guide download pdf (Page 19)

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USER’S GUIDE

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Watchdog Features

Overview

To detect internal problems and recover from unanticipated inputs, the unit

uses internal, system-wide watchdog mechanisms. When it reboots itself to

recover from an internal problem, a System: Warmstart event is recorded in

the Event Log.

Network interface watchdog mechanism

The unit implements internal watchdog mechanisms to protect itself from

becoming inaccessible over the network. For example, if the unit 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

reboots itself.

Resetting the network timer

To ensure that the unit does not reboot if the network is quiet for 9.5

minutes, the unit attempts to contact the Default Gateway every 4.5

minutes. If the gateway is present, it responds to the unit, 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 unit from rebooting.

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APC MasterSwitch User's Guide Page 19