virtual_network_technology资源-CSDN文库

网络虚拟化

需积分: 31 170 浏览量 2014-06-02 16:35:44 上传评论收藏 401KB PDF 举报

资源推荐

资源详情

资源评论

Virtual networking technologies at the server-network edge

Technology brief

Introduction ......................................................................................................................................... 2

Virtual Ethernet Bridges ........................................................................................................................ 2

Software-based VEBs – Virtual Switches .............................................................................................. 2

Hardware VEBs — SR-IOV enabled NICs............................................................................................ 4

Edge Virtual Bridging ........................................................................................................................... 5

VEB mode ....................................................................................................................................... 7

S-channel technology ........................................................................................................................ 7

Port extension technology ..................................................................................................................... 8

Disadvantages with port extension approach .................................................................................... 10

Status of IEEE standards and industry adoption ..................................................................................... 11

Conclusion ........................................................................................................................................ 11

For more information .......................................................................................................................... 12

Introduction

Hypervisors add a new layer of software and virtual networking that dramatically affects data center

servers and their associated network connectivity.

In the past, network administrators managed the external network infrastructure and occasionally

managed the server NICs. Server administrators managed the server, the applications running on the

server, and usually the server NICs. Hypervisors push the boundary of network infrastructure into the

physical server by their use of virtual switches (commonly referred to as soft switches or vSwitches).

This blurs the line between the domains of the server administrator and of the network administrator.

Server administrators typically configure the vSwitches but can’t see or change the external network

configurations. Network administrators can’t configure or debug the vSwitches. Challenges arising

from hypervisors include performance loss and management complexity of integrating software-based

vSwitches into your existing network management.

Industry leaders are proposing two fundamentally different approaches to deal with server-network

edge challenges and to provide more management insight into networking traffic in a virtual machine:

• Edge Virtual Bridging (EVB) with Virtual Ethernet Port Aggregator (VEPA) technology

• Port extension technology

The EVB approach uses industry-standard technologies at the server-network edge. It promotes

network management and network service provisioning as close to the edge as possible. The industry-

standard approach ensures that new technologies will work within your existing environments and

organizational roles. The goal of HP is to enable a simple migration to advanced technologies at the

server-network edge without requiring an entire overhaul strategy for your data center.

The port extension approach reflects all network traffic onto a central controlling bridge. This gives

network administrators full access and control but at the cost of bandwidth and latency.

The IEEE standards supporting networking in virtual machine (VM) environments are in the final draft

stages. It is not clear the extent to which hardware and hypervisor vendors will support these

standards. This uncertainty means that whether you are a server administrator or network

administrator, you may need to consider numerous factors when choosing new server and network

technologies.

Virtual Ethernet Bridges

A Virtual Ethernet Bridge (VEB) is a virtual Ethernet switch that you implement in a virtualized server

environment. It is anything that mimics a traditional external layer 2 (L2) switch or bridge for

connecting VMs. VEBs can communicate between VMs on a single physical server, or they can

connect VMs to the external network.

The most common implementations of VEBs are software-based vSwitches built into hypervisors. But

vendors can use the PCI Single Root I/O Virtualization (SR-IOV) standard to build hardware-based

VEBs in NICs.

Software-based VEBs – Virtual Switches

In a virtualized server, the hypervisor abstracts and shares physical NICs among multiple virtual

machines, creating virtual NICs for each virtual machine. For the vSwitch, the physical NIC acts as

the uplink to the external network. The hypervisor implements one or more software-based virtual

switches that connect the virtual NICs to the physical NICs.

Data traffic received by a physical NIC passes to a vSwitch. The vSwitch uses its hypervisor-based

configuration information to forward traffic to the correct VMs.

When a VM transmits traffic from its virtual NIC, a vSwitch forwards the traffic in one of two ways

(see Figure 1):

• If the destination is external to the physical server or to a different vSwitch, the vSwitch forwards

traffic to the physical NIC.

• If the destination is internal to the physical server on the same vSwitch, the vSwitch forwards the

traffic directly back to another VM.

Figure 1: In a VEB implemented as a vSwitch, traffic can be “switched” locally inside the Hypervisor vSwitch

(gray line) or sent directly to the external network via the physical NIC (blue line).

Using a software-based vSwitch has a number of advantages:

• Good performance between VMs. A vSwitch typically uses only L2 switching and can forward

internal VM-to-VM traffic directly. Bandwidth is restricted only by available CPU cycles, memory bus

bandwidth, or limits configured by the user in the hypervisor.

• Deployment without an external switch. Administrators can provide an internal network with no

external connectivity. For example, you can run a local network between a web server and a

firewall application running on separate VMs within the same physical server.

• Support for a wide variety of external network environments. vSwitches are compliant with

standards and can work with any external network infrastructure.

vSwitches also have several disadvantages:

• Consume valuable CPU and memory bandwidth. The higher the traffic load, the greater the number

of CPU and memory cycles required to move traffic through the vSwitch, reducing the ability to

support larger numbers of VMs in a physical server.

• Lack network-based visibility. vSwitches have a limited feature set. They don’t provide local traffic

visibility or have capabilities for enterprise data monitoring, security, or network management. This

can affect network policies in the data center for accounting, security, and reliability.

• Lack network policy enforcement. Modern external switches have many advanced features such as

port security, quality of service (QoS), and access control lists (ACL). But vSwitches often do not

L2 net(s)

Physical NIC

Virtual NIC

External Network

Physical Server

VM Edge

Switch Edge

Server

Edge

Hypervisor

vSwitch

剩余11页未读，继续阅读

评论收藏

内容反馈

zhengleiguo

粉丝: 37
资源: 2

virtual_network_technology

terraform-azure-virtual-network：这是一个Terraform定制模块，用于在Azure Cloud中创建虚拟网络

Research of resource optimization technology based on connectivity probability in vehicular network

ISO IEC 30163：2021 Internet of Things (loT) - System requirements of loT and sensor network technology-based integrated platform for chattel asset monitoring -完整英文版（22页）.pdf

ISO IEC IEEE 18880：2015 Information technology — Ubiquitous green community control network protocol - 完整英文电子版（74页）.pdf

java se - downloads oracle technology network oracle 中国.pdf

Virtual Machines: Versatile Platforms for Systems and Processes part2

Virtual Machines: Versatile Platforms for Systems and Processes part1

Virtual Machines: Versatile Platforms for Systems and Processes part3

Virtual Machines: Versatile Platforms for Systems and Processes

survey of neural network technology for automatic target recognition

Novel virtual user scheme to increase data confidentiality against eavesdropping in OCDMA network

The-core-technology-and-actual-combat-of-network-games-Study:针对网络游戏核心技术与实战一书的笔记和原始码

Multi-agent Sampling by BFS, Random Walk and Snowball:Multi-agent sampling by BFS, Random Walk and Snowball in virtual social network-matlab开发

virtual reality based rehabilitation and game technology

Robot Intelligence Technology and Applications 5

Cisco Press - OSPF Network Design Solutions, 2nd Edition

ISO_IEC_18028-5_2006 英文原版

Performance Enhancement for Network I/O Virtualization with Efficient Interrupt Coalescing and Virtual Receive-Side Scaling

implement IBM storage V7000 7.2

Discusses the computer network safe guard technology shallowly

Construction and resource allocation of cost-efficient clustered virtual network in software defined networks

opnet network simulation technology and ist application

Modern-mobile-communication-and-network-technology

Particle swarm optimization based multi-domain virtual network embedding

智能制造相关名词术语和缩略语.doc

MCTS Self-Paced Training Kit (Exam 70-642) Configuring Windows Server 2008 Network Infrastructure

Learning.Docker.Networking.17852809

Microsoft Azure IaaS Essentials(PACKT,2015)

虚拟化：管理者指南

最新资源