discoverying and polling VRF

includes/snmp.inc.php

@@ -750,8 +750,14 @@ function snmp_gen_auth(&$device) {
     $cmd = '';
 
     if ($device['snmpver'] === 'v3') {
+	
         $cmd = " -v3 -n '' -l '".$device['authlevel']."'";
-
+		
+		//add context if exist context
+		if(key_exists('context_name', $device)){
+			$cmd = " -v3 -n '".$device['context_name']."' -l '".$device['authlevel']."'";
+		}
+		
         if ($device['authlevel'] === 'noAuthNoPriv') {
             // We have to provide a username anyway (see Net-SNMP doc)
             // FIXME: There are two other places this is set - why are they ignored here?