它的SDK里有篇文档讲的很清楚，你去看一下就明白了。给你参考一下:Purpose of L2 Shadow TableIn some applications it may be desirable for ethernet switch software tokeep an L2 (ARL) Shadow Table, which is a copy of the hardware L2 lookuptable in host memory that is kept up to date as closely as possible.Some possible uses for an L2 shadow table a
