The network consists of a variety of networking devices. In addition to the traditional physical network, the networks for a virtualized environment also include invisible networks running inside servers. This chapter will cover basic knowledge about both types of networks.

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Network Basics for Cloud Computing

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Foreword
 The network consists of a variety of networking devices. In addition to the
traditional physical network, the networks for a virtualized environment also
include invisible networks running inside servers. This chapter will cover basic
knowledge about both types of networks.

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Objectives
 Upon completion of this course, you will:
 Understand how physical and virtual switches work.
 Understand the network architecture used for virtualized environments.
 Understand the traffic flows between VMs.
 Understand concepts related to VLAN.

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Contents
1. Network Architecture for Virtualization
2. Physical Network for Virtualization
3. Virtual Network for Virtualization
4. Network Features of Huawei Virtualization Product

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How Do VMs Communicate?
How do VMs
communicate
with each other?
?

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Network Architecture for Virtualization
VM VM
Physical
server
VM VM
Physical
server
VM VM
Physical
server
VM VM
Physical
server

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Basic Network Concepts
VM VM VM
1
0
1
0
Broadcast & Unicast Routing
Default gateway VLAN
VM
VM
VM
VM
Communication
source
VM on network
segment A
VM on network
segment B
VM on network
segment C
VM VM VM VM VM VM
Trunk
Access
Access
Access Access
Access
Access
VLAN 1 VLAN 2 VLAN 3 VLAN 1 VLAN 2 VLAN 3
VM
VM
VM
VM
Communication
source
VM on network
segment A
VM on network
segment B
VM on network
segment C

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Contents
1. Network Architecture for Virtualization
2. Physical Network for Virtualization
3. Virtual Network for Virtualization
4. Network Features of Huawei Virtualization Product

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Physical Network Devices
Router Layer 3 switch
Layer 2 switch Server NIC

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Router in a Virtualized Environment
Internet
VM VM VM VM VM VM

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Layer 3 Switch in a Virtualized Environment
VM VM VM
Virtual Machines
Physical Servers
Storage Devices
Users

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Layer 2 Switches in a Virtualized Environment
VM VM VM
Physical Servers Storage Devices Users
Management
Switch
Storage
Switch
Service
Switch

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Physical NICs in a Virtualized Environment
Management traffic
Service traffic
Storage traffic
Not bundled
Bundled
Physical
form
Logical
form

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Contents
1. Network Architecture for Virtualization
2. Physical Network for Virtualization
3. Virtual Network for Virtualization
4. Network Features of Huawei Virtualization Product

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Mainstream Virtual Network Architecture
Guest OS
Application program A
Binaries/Libraries
Guest Machine
Guest OS
Application program A
Binaries/Libraries
Guest Machine
Guest OS
Application program A
Binaries/Libraries
Guest Machine
Host Machine
Virtual
Switch
Bridged NAT

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Bridged vs. NAT
Bridged NAT
VM VM
TAP0 TAP1 TAP2
Host Machine
VM VM
TAP0 TAP1 TAP2
Host Machine

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Virtual Switch - Open vSwitch

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Distributed Virtual Switch
Guest OS
Application program A
Binaries/Libraries
Guest Machine
Guest OS
Application program A
Binaries/Libraries
Guest Machine
Guest OS
Application program A
Binaries/Libraries
Guest Machine
Host Machine 1 Host Machine 2 Host Machine 3

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Contents
1. Network Architecture for Virtualization
2. Physical Network for Virtualization
3. Virtual Network for Virtualization
4. Network Features of Huawei Virtualization Product

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FusionCompute Network Architecture
Host Machine 1 Host Machine 2
Virtual
Switch Uplink
Port group
VLAN 100
Port group
VLAN 200
Port group
VLAN 300
Virtual
Switch
Uplink
Port group
VLAN 100
Port group
VLAN 200
Port group
VLAN 300

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Traffic Flow
Host Machine 1 Host Machine 2
Virtual
Switch Uplink
Port group
VLAN 100
Port group
VLAN 200
Port group
VLAN 300
Virtual
Switch
Uplink
Port group
VLAN 100
Port group
VLAN 200
Port group
VLAN 300

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Security Group
Security Group

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Quiz
1. Which of the following falls into the category of “north-south traffic”? ()
A. Traffic between VMs in a data center
B. Traffic generated when users access the data center through the Internet
C. Traffic generated during VM live migration
D. Traffic between VMs in different data centers
2. One VM can have multiple virtual NICs connecting it to different virtual switches.
A. TRUE
B. FALSE

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Summary
 This chapter covers basic knowledge about the physical and virtual networks
used in virtualized environments.

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Recommendations
 Huawei e-Learning website:
 http://support.huawei.com/learning/Index!toTrainIndex
 Huawei Support case library:
 http://support.huawei.com/enterprise/servicecenter?lang=en
 HCIA-Cloud Computing v4.0 online forum
 https://forum.huawei.com/enterprise/en/Huawei-Official-Communication-Channel-
HCNA-Cloud-Certification-Course/thread/456287-911

26. www.huawei.com
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