private void startDistributedSystem(Attributes atts) {
    Assert.assertTrue(stack.isEmpty());

    String id = atts.getValue(ID);
    if (id != null) {
      config.setSystemId(id);
    }

    String disable_tcp = atts.getValue(DISABLE_TCP);
    if (disable_tcp != null) {
      config.setDisableTcp(DISABLE_TCP.equalsIgnoreCase("true"));
    }

    stack.push(config);
  }
When a <code>distributed-system</code> element is encountered, we push the
<code>DistributedSystemConfig</code> on the stack.
geode-core/src/main/java/org/apache/geode/admin/internal/ManagedEntityConfigXmlParser.java