Srv6 debut

in the past 20 For years ,IPv6 The application of extended message headers is very limited . With 5G And the rise of new businesses such as cloud services and the development of network programming technology , The service requires that the forwarding plane of the network has stronger programmability , At the same time, we need more concise integrated network solutions . In this context ,SRv6 emerge as the times require .SRv6 It's based on IPv6 Data plane implementation SR Network architecture , It supports inserting forwarding instructions in the header node to guide the forwarding of data packets ,SRv6 Combined with the SR-MPLS Head end programming and IPv6 Two advantages of header scalability , Let people see IPv6 Your turnaround .

With MPLS Based on it, it has achieved great success , At the same time, it also brings some problems and challenges , Mainly reflected in the following 3 In terms of .

• IP The islanding problem of the bearer network
  . although MPLS Unified bearing network , however IP backbone network 、 Metropolitan area network 、 Mobile bearer networks are separated , Need to use cross domain VPN And other complex technologies , As a result, the deployment of end-to-end services is very difficult .

• IPv4 And MPLS The programmable space of the package is limited
  . At present, many new businesses need to add more forwarding information to the forwarding plane , but IETF A statement has been issued , Stop as IPv4 Develop updated standards , also MPLS The field format and length of the label are fixed , Lack of scalability , These make it difficult for them to meet the network programming needs of future businesses .

• Decoupling of application and bearing network , It is very difficult to optimize the network itself , And it is difficult to enhance the value of the network
  . At present, operators are generally facing the challenge of being pipelined , Unable to get corresponding benefits from value-added applications ; And the lack of application information , It also makes operators can only use extensive methods for network scheduling and optimization , Waste of resources . In the history of the development of network technology , People have also tried to promote network technology to the application side , for example ATM To desktop , But they all failed . and MPLS I have also tried to get closer to hosts and Applications , Such as MPLS Into the cloud , But actually MPLS Difficult to deploy in the data center , Instead, it's VXLAN It has become the de facto standard of the data center .

SRv6 Technology undertakes the mission of solving these key problems .

• SRv6 compatible IPv6 Route forwarding of , be based on IP Accessibility makes it easier to interconnect different networks , No need to be like MPLS That uses extra signaling , There is no need to upgrade the whole network .

•  SRv6 be based on SRH（Segment Routing Header, Segment route extension message header ） It can support more kinds of encapsulation , It can well meet the diversified needs of new businesses .

•  SRv6 about IPv6 Its affinity makes it possible to IP Bearer network and support IPv6 Applications of are seamlessly integrated , Application awareness through the network , So that operators can provide more possible value-added services .

With 5G、 The development of new businesses such as cloud business and Internet of things , The access of more network devices has an increasing demand for address expansion and network programmability . be based on SRv6 It can better meet the needs of these businesses , Promote the development of network business , Promote the network to enter a new All IP Time , namely

be based on All IPv6 Usher in the era of smart and simple Internet of all things

.