librenms-librenms/includes/polling/netstats-ip_forward.inc.php

<?php

if ($device['os'] != 'Snom') {
    echo ' IP-FORWARD';

    // Below have more oids, and are in trees by themselves, so we can snmpwalk_cache_oid them
    $oids = array('ipCidrRouteNumber');

    unset($snmpstring, $fields, $snmpdata, $snmpdata_cmd, $rrd_create);

    $rrd_def = array();
    $snmpstring = '';
    foreach ($oids as $oid) {
        $oid_ds       = truncate($oid, 19, '');
        $rrd_create[] = "DS:$oid_ds:GAUGE:600:U:1000000"; // Limit to 1MPPS?
        $snmpstring .= ' IP-FORWARD-MIB::'.$oid.'.0';
    }

    $data = snmp_get_multi($device, $snmpstring, '-OQUs', 'IP-FORWARD-MIB');

    $fields = array();
    foreach ($oids as $oid) {
        if (is_numeric($data[0][$oid])) {
            $value = $data[0][$oid];
        } else {
            $value = 'U';
        }
        $fields[$oid] = $value;
    }

    if (isset($data[0]['ipCidrRouteNumber'])) {
        $tags = compact('rrd_def');
        data_update($device, 'netstats-ip_forward', $tags, $fields);

        $graphs['netstat_ip_forward'] = true;
    }
}

unset($oids, $rrd_def, $data, $oid, $fields, $snmpstring, $tags);