查找路由表以给出下一跳地址是路由器中分组转发的核心步骤，因此快速的路由查表算法是实现高速分组转发的关键。
Routing lookup plays a key part of packet forwarding, so fast IP address lookup algorithm is the significant part of high speed packet forwarding.
每个路由器的路由表显示了到达目的地址的最佳路径，对于要有几跳的地址，它显示出最佳的下一跳路由器。
Each router's routing table shows the best route to the destination address; for addresses that may be several hops away, it shows the best next-hop router.
如果查找路由表显示包的目的地不在本地子网，路由器就利用下一跳路由器的MAC地址把包转发给下一跳路由器。
If the route table lookup shows that the packet is destined for a non-local subnet, the router forwards the packet to the next-hop router using the next-hop router's MAC address.
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