SDN的产品化实践
——华为SDN解决方案
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业界SDN思路简介
华为企业网络SDN愿景
SDN最佳实践与技术创新
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什么是SDN?
ONF:SDN is a new approach to networking
and its key attributes include: separation of
data and control planes; a uniform vendor-
agnostic interface between control and data
planes; a logically centralized control plane;
and slicing and virtualization of the
underlying network.
Gartner:Software-defined networking
(SDN) is a new approach to designing,
building and operating networks that focuses
on delivering business agility while lowering
capital and operational costs. It is far more
than just a new set of APIs designed to
replace command line interfaces for
managing individual devices.
VMware: VMware Software Defined
Networking (SDN), available today, helps
solve the data center networking challenge.
which virtualizes the network and creates
logical networks that meet the agility,
performance and scale requirements of
virtualized applications and data.
SDN
Software-Defined Networking
开放API
网络虚
拟化
SDN
Overlay
控制面与数
据面解耦
解决实
际问题
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Google: As networking systems scale,
whether it be growth in bandwidth or the
number of users being served, one has to
worry about manageability, cost-efficiency,
robustness and availability of the network
fabric. SDN allows you do tackle many of
these problems.
Verizon:Verizon has deployed SDN as an
overlay network for video distribution
services. For scale and flexibility, the SDN
framework must support multiple VM
domains, multiple network domains, and
multiple services/applications with open,
standard interfaces.
SDN主流技术路线
OpenFlow
标准网络开放
技术架构:
1、转发与控制分离架构;
2、标准化转发面;
优点:
1、易于流量调度;
2、开放生态链;
技术架构:
1、开放网络设备能力;
2、标准化API;
优点:
1、充分利用现有设备;
2、快速实现;
Overlay: 网络叠加技术
NFV(Network Function Virtualization)
技术架构:
1、网络边缘软件化;
2、Overlay技术;
NICIRA
已经被VMware收购
优点:
1、与物理网络解耦;
2、灵活部署;
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技术架构:
1、网关功能软件化;
2、归一化平台;
优点:
1、快速业务供应;
2、降成本;
ONF所定义的SDN架构
ONF定义的SDN架构
OpenFlow实际部署图
Software-Defined Network
Architecture
APP1
APPn
Controller
OF Switch
OF Switch
OF Switch
OF Switch
OF: OpenFlow
Source: ONF white paper -- Software-Defined
Networking (SDN): The New Norm for Networks
OpenFlow
交换机
Thin
SW
Secure
Channel
Switching
Flow Table
HW
特征:控制转发分离、集中控制器、网络开放可编程、转发面抽象
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ONF开放网络联盟:OpenFlow的发展
2012.10
OF-Test
1.0, 互操
作 测试,
2012.9
OpenFlow
1.3.1完善
版本
2011.12
Openflow
1.2 ,IPv6,
Extensible
expressio
n
多控制器
2012.4
OpenFlow
1.3.0,
8021.ah
PBB,
设备和控
制器件的
多并行通
道
2002-2007
2009.12
2011.02
2011.03
Research
Frustratio
n/CleanSl
ate
Openflow
1.0
单级流表
L2IPv4流
表定义
ONF 成立
Openflow
1.1;多级
流表,
增加MPLS,
VLAN,组
播表,
ECMP;
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网络开放:IETF定义的开放SDN架构
IETF定义的开放SDN架构
IETF重点研究项目
核心思路: 重用当前的技术而不是OpenFlow
关注重点: 设备控制面的功能与开放API
优点:
1、充分利用现有设备,保护投资
2、快速实现
1. XML-based SDN (Software-Driven
Network)
I2RS(Interface to Routing System)
利用Netconf和已有设备接口
2.
一个新接口,将路由提供给APPs
3. ForCES(Forwarding and Control Element
Separation)
已研究10年,目前支持的较少
PCE
ALTO
Policy
control
Traffic
Monito
NMS
PCEP
IRS
Diameter Netflow
XML/Snmp/CLI
Existing Routers/Switches
Figure1 XML-based Software Driven Network
Figure2 I2RS and other existing device interfaces
ALTO: Application-Layer Traffic Optimization
NMS: Network Management System
PCE:Path Computation Element
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网络叠加技术:Overlay SDN架构
Overlay SDN架构
云业务对网络的新需求
Overlay SDN
统一集中部署
快速业务对接
软件快速实现
叠加技术解耦
与云业务对接的
NVP集中控制
Hypervisor层的软
件实现
满足业务持续创新和快速上线
适应云业务“实时”“按需”“动态化”
的快速部署(如:虚拟机自动迁移、多租
户安全隔离)
Overlay SDN方案
网络虚拟化
核心思路:将网络服务与底层的物理网络
设备解耦,从而创建灵活的虚拟网络。
服务器
Hyperv
isor
技术架构:
Source: It’s Time to Virtualize the Network
1、网络边缘控制器(NVP)
2、Overlay技术(OpenVswitch)
Overlay本质是硬件更新无法适应业务快速变化的诉求,转而用软件实现。
NVP: Network Virtualization Platform
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