APC Battery Management System - Manual (Page 23)

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USER’S GUIDE
Battery Management System
16
Watchdog Features
Network interface watchdog mechanism
The master unit’s built-in Management Card implements internal watchdog
mechanisms to protect itself from becoming inaccessible over the network.
For example, if the management card 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 Management Card does not reboot if the network is quiet
for 9.5 minutes, the Management Card attempts to contact the default
gateway every 4.5 minutes. If the gateway is present, it responds to the
Management Card, 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
seven-minute timer frequently enough to prevent the Management Card
from rebooting.