APC AP9617 User Manual download pdf (Page 9)

USER’S GUIDE

network management card

Watchdog Features

Overview

To detect internal problems and recover from unanticipated inputs, the

Management Card 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 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 9.5-minute timer

frequently enough to prevent the Management Card from rebooting.

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APC AP9617 User Manual Page 9