本节书摘来自异步社区《IP路由协议疑难解析》一书中的第1章，第1.8节，作者 【美】Zaheer Aziz, CCIE #4127 , Johnson Liu, CCIE #2637 , Abe Martey, CCIE #2373 , Faraz Shamim, CCIE #4131，更多章节内容可以访问云栖社区“异步社区”公众号查看
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