节点本地,链路本地,站点本地的区别?

学习计算机网络的时候看到了“节点本地”,“链路本地”,“站点本地”这三个词,百度了一下,只看到大家解释了“链路本地”和“站点本地”的意思,但好像没有人解释“节点本地”的含义。想请教一下大牛们,能系统地,简洁地解释一下三者的含义和区别吗?

图片说明

看图会比看文字易懂,更直观,直接上图不废话。

node-local(interface-local), link-local和site-local.
node-local最早定义在rfc1884,https://tools.ietf.org/html/rfc1884
现在的名字叫interface-local,在rfc4291,https://tools.ietf.org/html/rfc4291

区别在于地址前缀

FF01::就是node-local
FF02::就是link-local

    |   8    |  4 |  4 |                  112 bits                   |
    +------ -+----+----+---------------------------------------------+
    |11111111|flgs|scop|                  group ID                   |
    +--------+----+----+---------------------------------------------+


 scop is a 4-bit multicast scope value used to limit the scope of
 the multicast group.  The values are:

     0  reserved
     1  node-local scope
     2  link-local scope
     3  (unassigned)
     4  (unassigned)
     5  site-local scope
     6  (unassigned)
     7  (unassigned)
     8  organization-local scope
     9  (unassigned)


应用上
node-local scope就是单机内的多播,用于一个node不同进程间的通信
link-local scope就理解成局域网的多播
site-local scope么广域网的多播