Sd-wan notes

SDN（Software Defined Network） Software Defined Network .

SD-WAN Software definition Wan .

WAN Wide area network

LAN（Local Area Network） LAN

CPE（Customer Premise Equipment） Customer terminal equipment

uCPE yes Universal CPE, Universal client devices .vCPE yes Virtual CPE, Virtual client device .

SDN Is to build a network SDN Controller node , Unified management and control of the data forwarding of the underlying devices . The management functions of all subordinate nodes are stripped （ hand SDN controller ）, These nodes only have forwarding function .SDN It is mainly used in bearer network . The core function of bearer network is to transmit data . The process of transmission is the process of continuously routing and forwarding data packets ,SDN Is the decoupling of control surface and forwarding surface .

SD-WAN Think of it as SDN A branch of , But the scope of application is cloud networking 、 Or the network of a group company .

MPLS

MPLS,Multi-Protocol Label Switching, Multiprotocol label switching . This is an efficient and reliable network transmission technology . Label data streams , Tell all routing devices on the line , My identity , Where am I going .MPLS A dedicated line , It's based on MPLS Technology wide area network service private line .

MPLS-VPN, Based on the carrier MPLS Private network VPN.

SDWAN Compared with the advantages of dedicated lines ：

1、 The cost is low

2、 The deployment of fast

3、 Convenient maintenance

4、 There is a management platform , Good visualization .

do SDWAN The manufacturer of ：

The first category , Is a company that focuses on providing Wan solutions . They buy operator lines , Then build your own Wan , Provide... To enterprise users SD-WAN service .

The second category , Is a traditional equipment manufacturer , Huawei, for example 、 ZTE 、 Xinhua third class . Provide solutions 、 Hardware 、 Software , They sell everything .

The third category , It's about SD-WAN Sell optimization 、 Security 、 Companies with encryption and other technologies and products , They have their own hardware and software products , Sell it to SD-WAN user .（ Provide value-added services ）

Fourth category , Move 、 China Unicom and China Telecom are three telecom operators .

Huawei digital communication HCIP Yes SDWAN, When you have money, learn .

Device deployment ： It is required to deploy in the branch office with SDWAN Functional CPE, You can plug in a card or network cable , Look at the specific needs .

Simply speaking , It is through SDWANcpe Get on the Internet , Tunnel to the WAN through the Internet , Complete branch access to Wan .

SRv6: namely SR（Segment Routing）+IPv6

SR The core principle of is to plan and distribute the path in advance . When a packet enters the network , The network will package all the links and node information it will go through in this packet ( Or say ： Cut the message forwarding path into different segments , And insert segment information into the message at the starting point of the path , The intermediate node only needs to forward according to the segment information carried in the message ). Such path segmentation , be called “Segment”, And pass SID（Segment Identifier, Segment ID ） To mark .

SR Technical support MPLS and IPv6 Two forwarding planes , be based on MPLS Forward plane SR be called SR-MPLS（Segment Routing MPLS）, Its SID by MPLS label （Label）; be based on IPv6 Forward plane SR be called SRv6, Its SID by IPv6 Address .IPv6 The unique message structure can be compared with SR Perfect match .