APC IN ROW RD ACRD101 User's Guide download pdf (Page 12)

InRow RD 100-Series and InRow RD 200-Series User’s Guide5

Watchdog Features

Overview

To detect internal problems and recover from unanticipated inputs, the InRow RD uses internal, system-

wide watchdog mechanisms. When it restarts to recover from an internal problem, a System:

Warmstart event is recorded in the event log.

Network interface watchdog mechanism

The InRow RD implements internal watchdog mechanisms to protect itself from becoming inaccessible

over the network. For example, if the InRow RD 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.

Resetting the network timer

To ensure that the InRow RD does not restart if the network is quiet for 9.5 minutes, the InRow RD

attempts to contact the default gateway every 4.5 minutes. If the gateway is present, it responds to the

InRow RD, 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 InRow RD from restarting.

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APC IN ROW RD ACRD101 User's Guide Page 12