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在此处的路径列表中:http: //archive.routeviews.org/dnszones/

我偶然发现了一个条目的这一部分

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如果你看到:

$*.191.144.2 IN TXT "8492 34224 34984 34984 34984 34984 34984 34984 34984 34984 34984 34984 48159 48159 48159 48159 48159 48159" "2.144.176.0" 示例 2.0

34984 在链接到 48159 之前链接到自身 9 次。这是为什么?

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1 回答 1

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通过“链接到自身 9 次”,您的意思似乎是“出现 9 次是 AS 路径中的一行”。AS 路径不是链接链接或任何东西,所以我不确定您为什么使用术语“链接”。

多次将您的 AS 附加到 AS 路径是不推荐路由的常用技术。因为 BGP 路由选择算法中的标准之一是 AS 路径长度,所以路径中包含更多 AS 的路由比具有较少 AS 的路由更不可能被使用。

请注意,在预置 3 或 4 次之后进行预置,额外的前置在大多数 Internet 上不太可能有用。一个典型的路由器不太可能看到两个相同目的地的优先级相同的路由,它们的 AS 路径长度相差超过 3 或 4。此外,大多数路由器会更喜欢一组特定的路由(例如客户路由)而不是另一组(例如传输路由)使用比 AS 路径长度更重要的参数(本地首选项),因此在这种情况下,即使预先尝试影响那些路由器的路径选择也是徒劳的。

于 2012-10-17T18:06:48.423 回答