ovn gateway chassis 的优先级设置

  <dt><code>lrp-set-gateway-chassis</code> <var>port</var>
      <var>chassis</var> [<var>priority</var>]</dt>
  <dd>
    Set gateway chassis for <var>port</var>. <var>chassis</var>
    is the name of the chassis. This creates a gateway chassis entry
    in Gateway_Chassis table. It won't check if chassis really exists
    in OVN_Southbound database. Priority will be set to 0
    if <var>priority</var> is not provided by user. <var>priority</var>
    must be between <code>0</code> and <code>32767</code>, inclusive.
  </dd>
  
 
 
 意思就是如果是人为设置的，最高优先级的就是主 chassis。 如果不是人为设置的，优先级默认是 0.