東 海 大 學 資 訊 工 程 研 究 所 碩 士 論 文


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1 東 海 大 學 資 訊 工 程 研 究 所 碩 士 論 文 指 導 教 授 楊 朝 棟 博 士 以 網 路 功 能 虛 擬 化 實 作 網 路 即 時 流 量 監 控 服 務 研 究 生 楊 曜 佑 中 華 民 國 一 零 四 年 五 月
2 摘 要 與 的 概 念 一 同 發 展 的, 是 指 利 用 虛 擬 化 的 技 術, 將 現 有 的 網 路 硬 體 設 備, 利 用 軟 體 來 取 代 其 功 能, 實 踐 的 方 式 有 很 多 種, 其 中 在 實 踐 過 程 中 更 扮 演 不 可 或 缺 的 角 色 的 出 現 讓 有 了 一 個 簡 單 明 確 的 方 向, 的 重 點 是 將 傳 統 網 路 交 換 器 的 控 制 層 與 資 料 層 分 離, 利 用 軟 體 定 義 規 則 來 達 成 控 制 流 向 的 目 標, 也 因 為 這 樣 的 想 法 讓 的 概 念 伴 隨 而 生 雲 端 的 時 代, 已 經 是 很 常 見 的 服 務, 在 大 型 的 環 境, 網 路 是 得 探 討 的 問 題, 而 的 實 踐 將 會 強 化 的 整 體 效 能, 若 能 利 用 大 量 虛 擬 化 的 網 路 設 施 取 代 傳 同 硬 體, 在 建 置 擴 增 轉 移 都 能 大 大 提 升 其 便 利 性 目 前 已 有 不 少 人 開 始 著 手 研 究, 傳 統 網 路 硬 體 設 施 : 如 防 火 牆 負 載 平 衡 器 路 由 器 網 管 型 交 換 器 等 等, 都 是 熱 門 的 虛 擬 化 研 究 對 象, 但 虛 擬 化 後 的 網 路 設 施 能 否 取 代 傳 統 的 硬 體, 傳 統 硬 體 與 軟 體 在 效 能 表 現 上 的 差 異 為 何? 都 是 值 得 探 討 的 問 題 因 此 本 論 文 針 對 最 基 本 的 流 量 監 控 以 及 交 換 器 的 虛 擬 化 來 作 研 究, 透 過 虛 擬 化 的 交 換 器 取 代 傳 統 的 網 管 型 交 換 器, 並 實 踐 流 量 監 控 的 功 能, 無 須 再 透 過 硬 體 的 方 式, 再 結 合 達 到 基 本 網 路 管 理 的 功 能 面 對 雲 端 時 代 的 來 領, 已 開 始 傳 統 的 技 術 革 命, 在 本 論 文 之 中, 所 提 出 的 系 統 可 以 實 踐 在 任 何 有 網 路 的 環 境 上 關 鍵 字 網 路 功 能 虛 擬 化 網 路 流 量 監 控
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31 Limit = K Data b = T b T c Data p = T p T c
32 µ b = E(X b ) = 1 N N n=1 x n µ p = E(X p ) = 1 N N n=1 x n X b X p µ b µ p V ar(x b ) = E[(x µ b ) 2 ] = 1 N N (x n µ b ) 2 n=1 σ = V ar(x b ) outlier = O nb = x n µ b σ V ar(x p ) = E[(x µ p ) 2 ] = 1 N σ = V ar(x p ) N (x n µ p ) 2 n=1 outlier = O np = x n µ p σ
33 X b, O X b [i] O b [i] n 1 length of X b 3 O b [i] 3 { X b [i] X b [i].val.del X p, O X p [i] O p [i] n 1 length of X p 3 O p [i] 3 { X p [i] X p [i].val.del O nb O np X b X p µ b = E(X b ) = 1 N N x n = K b n=1 µ p = E(X p ) = 1 N N x n = K p n=1
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