当在需要分发不同类型数据的网络中安装任何交换器或路由器时，必须要支持多播。
When deploying any switch or router in a network that is going to distribute different types of data, you've got to support multicast.
交换器A因为没有路由器Y的MAC位址，所以会将这个讯框从所有的埠泛流出去。
Switch A does not have the MAC address of Router Y and will therefore flood the frame out its ports.
此外，与其他技术不一样，mpls不会增加预算，因为很多现有的路由器和广域网交换器支持此标准。
Additionally, unlike other technologies, MPLS won't consume your budget because many existing routers and WAN switches support the standard.
此外，与其他技术不一样，mpls不会增加预算，因为很多现有的路由器和广域网交换器支持此标准。
Additionally, unlike other technologies, MPLS won't consume your budget because many existing routers and WAN switches support the standard.
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