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Seven common problems in SD-WAN

1. The network technologies that attracted more attention in the past are SDN and NFV. Recently, some manufacturers have begun to put forward the application of SD-WAN technology. What is the actual demand for enterprises to adopt this approach? Those well-known enterprises have adopted SD-WAN

In fact, the concept of SD-WAN is also called Hybrid WAN. In the early days, it was to solve the instability of Internet in the enterprise market and the high price of MPLS × × direct connect. But for enterprises, the price is always discussed, if it is only to reduce costs, it can be solved by negotiation, competition and alternative lines, so the use of SD-WAN model is not the only and urgent. However, when enterprises are faced with more and more real-time applications in various points of delivery, such as video conferencing, remote desktops, virtual desktops, virtual applications, POS systems, payment transaction systems, telecommuting, telecommuting, real-time news delivery, etc., the demand and necessity of never-ending line makes enterprises have to find a way out with the help of SD-WAN technology. To improve the user experience and avoid transaction or amount losses when the line is interrupted.

Typical cases such as:

CIO Keith Hogie of The Tile Shop, an American household operator, said that "after using Citirx NetScaler SD-WAN and virtual desktops, the experience and interaction between business staff and customers in the design studio is better, meeting customers' expectations of digitization."

"We have seen the changes that SD-WAN will bring to future major sporting events," said Mr. Wheeler, chief technical officer of Sky TV, a New Zealand pay-TV company that broadcast the 2016 Rio Olympics through SD-WAN technology.

The Danish Agriculture and Fisheries Bureau "Danish AgriFish Agency" solves the problem of employees accessing internal IT applications on the sea through SD-WAN. BjameLund, head of infrastructure, said, "NetScaler SD-WAN integrates multiple online modes, so now the control ship can use 3G / 4G / LTE from four telecom operators and satellites at the same time. The coverage of the operation has been greatly increased. "

two。 One of the benefits of introducing SD-WAN is that it can save the cost of leasing direct lines, and can even integrate and replace routers, firewalls, WAN accelerators and other equipment. What are the other benefits?

Simplify management and security:

When SD-WAN becomes an indispensable platform, enterprises begin to think about whether deployment can be simplified and integrated when deploying costs in branch offices, so there is an overall SD-WAN solution that integrates routers, firewalls, DPI inspection, and WAN acceleration, which is aimed at enabling enterprises to truly achieve end-to-end application management and monitoring while saving costs and never-ending. Have safe management and monitoring.

And through the technology of Zero-Touch, IT can be deployed all over the world at any time, without the help of local people with IT capabilities.

Multi-cloud access and rapid application delivery

In addition, as more and more enterprise applications move to public cloud platforms, enterprises are also challenged in multi-cloud management and connectivity. Through the deployment of SD-WAN on public cloud platforms, such as AWS, Azure, etc., enterprises can enable branch offices to access applications without worrying about whether the applications are in the enterprise data center or the public cloud, so that users can access the best application resources at any time.

3. What parts should be paid attention to when evaluating deployment SD-WAN?

No matter how changeable and complex the current SD-WAN market is, enterprises still have to consider their own needs and future expansion when evaluating the plan, and evaluate it in a way that is not the best but the most suitable. List the following three rules of ABC to help you evaluate in advance when importing SD-WAN and maximize the expected benefits.

1. Application application services:

a. Those key application services need to be delivered at each point.

b. Uninterruptible application services

c. SLA level of application service

d. Security considerations for application services

e. User experience requirements for application services

f. New application service requirements in the future

2. Branch Branch:

a. Number of branch offic

b. Distance between the branch office and the data center

c. The importance of the branch, whether it is graded or not

d. Security control of branch offices

e. Behavior management of branch offices

f. Replacement of branch equipment, such as routers, firewalls, accelerators, etc.

g. Whether it can be imported in stages

h. Mobile branch demand, such as exhibitions, marketing activities, etc.

3. Connectivity connection

a. Bandwidth demand, whether it needs to be increased in the future

b. Line backup mode

c. Line switching time allowed

D. MPLS/Internet/4GLTM/ satellite access consideration

e. Multiple telecommunication line provider

f. Line contract replacement time

g. Users complain about line quality

h. Branch office and public cloud connectivity requirements

What is the effect of the 4.SD-WAN fee?

In terms of cost savings, each enterprise has different acquisition costs and different ways to adjust Internet bandwidth and MPLS bandwidth, so each company gets different results. If you look at it in terms of ROI, some are 12 months, while the "The Tile Shop" in the United States is 16-20 months. Citrix also provides ROI analysis imported into SD-WAN to assist customers in making judgments. However, as mentioned above, the price and benefit of application experience and security are the most valued when importing SD-WAN.

5. Each technology has its own shortcomings and disadvantages. What are the current challenges facing SD-WAN in this part?

After the launch of Citrix NetScaler SD-WAN products in April 2015, it has entered extensive discussion in Europe and the United States. Customers in Europe and the United States have also made them rethink their deployment model and investment strategy in branch offices because of the emergence of such a new technology. So there is a need to integrate SD-WAN and WAN acceleration, and there is also a need for security integration such as firewalls. These requirements are not small challenges for SD-WAN manufacturers in the market. Thanks to the continuous efforts of Citrix to interact with customers, the integrated model of SD-WAN and WAN acceleration was realized in 2016, and the functions of firewall and Internet behavior management were also realized in April 2017 this year to quickly meet the most important needs of customers.

6.SD-WAN, in the part of network reliability, some people think that SD-WAN can reach 99.999%, whether there is such a figure for reference.

Never stop.

At present, there are many different ways to implement SD-WAN in the market, which also causes different SD-WAN products in response time, and makes the network reliability very different. In the case of Citrix NetScaler SD-WAN, the way to implement SD-WAN is to judge which path to take by a single packet, so the switching time caused by link interruption is less than 10 milliseconds (ms). Coupled with the exclusive packet replication multi-link delivery technology, it can achieve zero interruption service requirements for important application services, such as VoIP, video conferencing and so on.

7. There are many similarities in the requirements of various SD-WAN manufacturers. What are the biggest features or differences of Citrix NetScaler SD-WAN?

The biggest difference in technology: allocating paths according to packets

From a technical point of view, the biggest difference in SD-WAN is the way the path is chosen based on a single packet. NetScalre SD-WAN distributes delivery in real time according to the current path quality, so that enterprises no longer have to worry about manually setting which service to take which route.

Citrix NetScaler SD-WAN automatically chooses the most suitable path according to the priority of application services, and enables a single application service used by a single client to use multiple lines at the same time, thus realizing the requirement that enterprises will never break the line in important application services.

The most important feature of the scheme: All-in-One

Citrix NetScaler SD-WAN 's scheme includes the following functions on a single device:

1. Application-level network firewall function

2. Integrate with cloud SWG SaaS services, such as ZScaler, to provide online behavior management

3. Data partition domain function, which provides security for different parts or application services.

4. Dynamic routing function

5. Wan acceleration

6. Analysis of the use of centralized application services

According to the above functions, to enable enterprises to reduce hardware investment in branch offices, and to meet the overall requirements of security and speed.

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