NetTAP® SDN Technology - Innovative Application of Network Traffic Control Visibility Part 1
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NetTAP® SDN Technology - Innovative Application of Network Traffic
Control Visibility Part 1
The principle of SDN Technology
Software Defined Network (SDN) is a new Network innovation
architecture proposed by Clean State Research Group of Stanford
University. It can define and control the Network in the form of
Software programming. It has the characteristics of separation of
control plane and forwarding plane and open and programmable.
The Development of SDN Technology
It has been more than 10 years since the concept was put forward,
continuous engineering practice and the extensive application of
SDN technology and its various branch technologies in various
industries. In today's data center, WAN, transmission and other
fields, SDN technology and its technical ideas have been generally
blossoming and bearing fruit, and become the basis of intelligent
and intentional network in the future.
The Core Advantage of SDN Technology
Network simplification: Simplifies configuration, management, and
optimization by providing a unified view of the network
architecture and a unified view of the entire network architecture.
High utilization: Centralized traffic engineering enables us to
effectively adjust the end-to-end traffic path so as to achieve
efficient utilization of network resources.
Quick failure repair: quick repair can be achieved for both link
and node failures. Moreover, the system can quickly aggregate
network resources, realize equal distribution, and predict some
network behaviors.
Smooth upgrade: The separation of the control plane and the
forward/data plane allows for smooth software upgrades without data
packet loss or performance degradation.
Elastic computation: the large-scale computation and path analysis
are integrated in the sub-controller and done by the latest
generation of servers.
What SDN does is to separate the control over the network equipment
and manage it by a centralized controller without relying on the
underlying network equipment, thus masking the differences between
the underlying network equipment. While control is completely open,
users can customize any network routing and transmission rule
policy they want to implement, making it more flexible and
intelligent. After the TRANSFORMATION of SDN, there is no need to
repeatedly configure the routers of each node in the network. The
devices in the network are automatically connected, only need to be
defined simple network rules when they are used. Therefore, if the
protocol built into the router does not meet the user's needs, it
can be modified programmatically to achieve better data exchange
performance. So, for network equipment, the users can like upgrade,
install the software to modify the network architecture, expansion
and satisfy the user to adjust the network architecture, or the
need to upgrade, and the underlying hardware, such as switches,
routers, you do not need to replace, save a lot of cost at the same
time, the network architecture of iteration cycle will be shorten.
Application of SDN Technology in Current Network
Data Center Network
The data plane and control plane of the traditional network
equipment are separated, and the centralized controller is used to
manage and configure various network equipment with standardized
interface. The programmable nature of the network brought by this
architecture makes the design, management and use of network
resources more possible, thus facilitating the innovation and
development of the network. Therefore, control and forwarding
separation, logic centralized control and open network programming
API are regarded as the three main characteristics that SDN differs
from traditional network technology. It is these characteristics
that enable SDN to well meet the use requirements of data center
network:
(1) High scalability and network resource utilization: Through
centralized management of forwarding publication, Controller can
control the size and direction of traffic in each link of the
network in real time, thus realizing virtual management of network
bandwidth resources and network functional elements. Computing,
storage and network all realize virtualization control, making
network expansion no longer dependent on network architecture. From
the extensive network module to the fine-grained resource pool
expansion, the network expansibility and resource utilization ratio
can be greatly improved.
(2) Support virtual machine migration and unified operation and
maintenance: As Controller can control the flow direction of
traffic in the network, virtual machine migration is easy to
implement as it is only to modify the forwarding items sent to the
switch. At the same time, SDN, VM Service Manager (VCenter) and IDC
network management platform all adopt centralized management
architecture, which is easy to integrate and realize highly
automatic unified management. Among them, SDN Controller is mainly
used to realize the centralized management and control of network
devices (including vSwitch residing in the server).VM service
manager is mainly used for VM management, including VM creation,
deployment and migration, etc. The IDC management platform is
mainly used to realize the overall coordination and control,
complete the coordination between VM service manager and SDN
controller, and realize the unified coordination and control of
computing resources, storage resources and network resources in the
data center.
(3) Support for multi-service and multi-tenant: SDN realizes
network resource virtualization and traffic programmability, so it
can flexibly build multiple independent business hosting networks
on fixed physical networks (as shown in the figure below) to meet
the requirements of multi-service and multi-tenant.
SDWAN
SDWAN, software-defined Wide Area network (WAN), is a service
formed by applying SDN technology to wan scenarios, which is used
to connect enterprise networks, data centers, Internet applications
and cloud services of a wide geographical scope.
As SD-WAN is a technology-driven application, there is no unified
definition in the industry, and the industry analysis and
consulting agencies such as IDC and Gartner have different
definitions. In comparison, the definition proposed by SDxCentral
can simply reflect the core idea of SD-WAN, that is, "SD-WAN is a
service formed by applying SDN technology to WAN scenarios, which
is used to connect enterprise networks with a wide geographical
range, including enterprise branches and data centers.
SD-EN (SDN Based Enterprise Network) focuses on the WAN connection
on the user side and provides efficient SDN-based solutions for the
connection of Enterprise headquarters and branches across wide area
networks. DataCenter Interconnection SD-DCI (SDN based DataCenter
Interconnection), refers to the movement of SDN-based solutions
between multiple data centers in an enterprise, or between
corporate offices and data centers. Cloud Interconnection SD-CX
(SDN Based Cloud Exchange) pays more attention to WAN connection on
the application side, providing efficient SDN-based solutions for
public Cloud, private Cloud and increasingly rich hybrid Cloud
applications.
T - SDN (Transmission SDN)
The traditional optical network is based on OTN interface with
fixed rate, fixed spectrum interval of optical layer and layer by
layer separation control. The newly increased bandwidth is
basically predicted by rolling planning, and the business
scheduling is mainly realized by ODUk cross scheduling of OTN
equipment, with low efficiency. By introducing SDN delivery, the
main values are:
It realizes the evolution of transmission network from "artificial
static network management configuration" to "real-time dynamic
intelligent control", improves the service opening speed, and
simplifies the network configuration, operation and maintenance.
To realize the unified control and management of multi - vendor
equipment and multi - layer multi - domain network.
By providing new network capability and open northbound interface,
business innovation capability such as intelligent dedicated line
and virtual transmission network can be realized quickly.
IBN (Network Based on Intention)
IBN is a closed-loop network architecture that can be built and
operated based on human business intentions under the condition of
mastering its "holographic state". Traditional networks rely on
humans to input specific policy execution commands. In IBN, instead
of typing policy commands directly, a human would enter the desired
"business intent," which is, "I want the network to reach a certain
situation." The network will automatically translate and complete
subsequent operations. After that, the network needs to verify the
matching between the actual network state and the expected network
state of the business intention in real time to form a continuous
closed-loop control process. To maintain this closed-loop process,
the network must be able to obtain its own global real-time state,
which we call "holographic state".
SDN technology is the implementation basis and technical means of
IBN (intent-based intelligent network). Based on the flexible
programmable and automatic control capability of SDN, SDN
technology is used to support and realize the business intention of
people in IBN network. Therefore, SDN technology is one of the
solid foundations of IBN network.
NetTAP® SDN Technology - Innovative Application of Network Traffic Control Visibility Part 1
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