1. How to enable SNMP on a netapp filerfiler1> options snmp.enable on
    filer1> options snmp
    snmp.access                  legacy
    snmp.enable                  on
    filer1>
  2. How to set and modify SNMP configration values?filer1*> snmp contact unixfoo@un1xf00.org
    filer1*> snmp contact
    unixfoo@un1xf00.org
    filer1*>

You can use Cacti ( http://www.cacti.net/index.php ) to monitor your netapp. This tool uses Netapp SNMP and plots graphs using RRD.

Few Other opensource SNMP monitoring tools, that can monitor heterogenous unix linux machines :