The number of forwarding states grows with the number of groups.
转发状态的数量随着组数的增长而增长。
With multicast tree aggregation, fewer trees are maintained which amounts to reduce both the number of forwarding states in routers and the overhead induced by control messages.
组播组的聚合使得网络中组播树的数量减少，路由器需要维持的组播转发状态和传递控制信息带来的控制开销都大大降低。
W: Let me see, name, address, nationality, forwarding address, passport number, place of issue, signature and date of departure.
W：我看看…姓名、地址、国籍、转投地址、护照号码、发照地点、签名、离店日期。
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