April 2015
Intermediate to advanced
372 pages
6h 56m
Chinese
Content preview from SDN: 軟體定義網路
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92 | 第 4 章：SDN 控制器
是一個典型的控制器（典型控制器為所有服務提供統一的溝通介面）。Trema 的相關資料
認為它是一個運作架構，而非僅僅是一個控制器。這一點將在後面的章節中詳細說明。
Ryu
Ryu
27
是一個採用元件化設計概念，同時完全以 Python 語言所撰寫的開放原始碼架構
（如圖 4-13 所示），由 NTT 實驗室（NTT Labs）支援。同時，Ryu 訊息服務也支援採
用其他語言所開發的元件。
Ryu 的運作元件，包括對 OpenFlow 協定的支援（支援 OF 1.3 版本，並包含 Nicira 擴充
功能）、事件管理、訊息機制、記憶體狀態管理、應用程式管理、基礎架構服務和一系
列可重新使用的函式庫（例如，NETCONF 函式庫、sFlow/Netflow 函式庫）。 此外，
Ryu 提供一些應用程式和服務，例如，Snort（入侵偵測）、L2 交換機、GRE 隧道機
制、VRRP、拓撲和統計服務…等。
在 API 層部份，Ryu 具備 Openstack Quantum 外掛程式，並且支援 GRE 堆疊網路和
VLAN 組態配置。
Ryu 針對 OpenFlow 的相關操作，也提供 REST 介面。
圖 4-13：Ryu 運作架構、應用程式和 API 介面示意圖
27. 請參考 Ryu 官方網站
http://www.osrg.net/ryu
。
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.