librenms-librenms/includes/discovery/os/ise.inc.php

<?php

if (!$os) {
    if ((strstr($sysObjectId, '.1.3.6.1.4.1.9.1.2139')) || (strstr($sysObjectId, '.1.3.6.1.4.1.9.1.1426'))) {
        $os = 'ise';
    }
}