网络工程 - Nexus 生成树上的奇怪输出？ - 吾爱随笔录

我对这个生成树输出感到非常困惑。每个后续的 vlan id 都有一个高于配置的 16384 的优先级。我认为这与扩展的系统 id 有关，但我不确定如何。

VLAN0001
  Spanning tree enabled protocol rstp
  ***Root ID    Priority    16385***
             Address     xxxx.xxxx.xxxx
             This bridge is the root
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    16385  (priority 16384 sys-id-ext 1)
             Address     xxxx.xxxx.xxxx
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec

...

VLAN0005
  Spanning tree enabled protocol rstp
  ***Root ID    Priority    16389***
             Address     xxxx.xxxx.xxxx
             This bridge is the root
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    16389  (priority 16384 sys-id-ext 5)
             Address     xxxx.xxxx.xxxx
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec
...

VLAN0020
  Spanning tree enabled protocol rstp
  ***Root ID    Priority    16404***
             Address     xxxx.xxxx.xxxx
             This bridge is the root
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    16404  (priority 16384 sys-id-ext 20)
             Address     xxxx.xxxx.xxxx
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec