title: Do not discover everything with discovery rule
body: <p>I'm trying to monitor Routerboard Mikrotik devices using Zabbix.
  So far so good... My only issue is that i'm using a discovery rule, this rule discover and create a graph for every single interface inside my MK
  ether1 ether2 ether3 ether4 pppoe1 pppoe2 pppoe3 pppoe4 pppoe5 etc
  I want this just to discover some specific vlans.
  How can i do that?
  I'm totally new to Zabbix and have no clue of *** i'm doing.</p>
  
  <p>edit1:sorry about my bad english and my language.</p>