Shulou(Shulou.com)06/02 Report--

The famous bucket effect tells us: "how much water a bucket can hold depends on the shortest plank." In the process of digital transformation of enterprises, whether the underlying IT infrastructure services can keep up with the pace of enterprise development is the key. In the past few years, great breakthroughs have taken place in computing power through hardware such as GPU and FPGA, and storage performance has been greatly improved with the popularity of SSD solid state drives. How can the network, as an important part of IT infrastructure, be reformed by SDN, IPv6 and other technologies in order to avoid becoming a "deficiency" hindering the digital transformation of enterprises?

In addition, how should the next generation network cope with the performance challenges brought by 25G or even 100G network cards? How does the UCloud virtual network evolve and solve these problems? UCloud user Conference "products and Technology Special event" in Shanghai Station on December 21st will bring you a sharing of the theme of next generation network. At that time, Yang Ra, vice president of UCloud technology, will lead you into the technical tuyere of the next generation network with in-depth thinking on these issues.

Cloud Computing brings New challenges to Virtual Network

We know that the traditional data center network consists of physical switches and routers, but in the cloud era, with the participation of technologies such as SDN and NFV, the network boundaries of the data center are expanding, from the virtual network inside the cloud server to the virtual network interconnected by the data center. In fact, network virtualization is not a new concept in the era of cloud computing. To put it simply, it is to simulate multiple logical networks on a physical network. The common forms are VLAN, VPC, × ×, and so on. So, what are the new challenges for virtual networks in the public cloud environment?

Cdn.xitu.io/2018/12/20/167cb0cd8c691cb6?w=553&h=539&f=jpeg&s=36932 ">

First of all, network virtualization requires the ability of multi-tenant isolation. In the earliest VLAN protocol, VID had only 12 bit and supported only 4094 virtual networks, which was obviously not enough for public cloud vendors, and then the emergence of Overlay technology solved this problem. From the early NVGRE to the more mainstream VxLAN and GENEVE, 24 bits (16m) tenant ID is supported, which just meets the multi-tenant needs of the public cloud.

The second is the capability of VPC (Virtual Private Cloud). VPC allows the network addresses of different tenants or even the same tenant to overlap, but the broadcast domain remains independent, that is, users can isolate their own private network on the public cloud through VPC, thus realizing the isolated deployment of different services.

Finally, network virtualization urgently needs to provide flexible and flexible control surface combined with SDN technology. If a new tenant is added to the traditional network, it is necessary to reconfigure the new hardware equipment, but if the network configuration is dynamically modified by software through SDN without touching the physical device, the virtual network can be dynamically changed easily and quickly.

The Evolution of UCloud Virtual Network

At the beginning of its establishment in 2012, UCloud adopted a combination of EBTables and IPTables to achieve tenant isolation, but soon found that this technical solution was not enough to provide users with secure and stable services. So from 2013, UCloud's virtual network began to use SDN technology, that is, VPC, to achieve tenant isolation. After nearly 5 years of technology upgrade and product iteration, the latest VPC 2.0 version supports flexible custom network segments, subnets across availability zones, NAT gateways and network ACL configurations.

At the end of 2013, based on the need for users to use physical machines as well as CVMs, UCloud took the lead in using hardware SDN switches to launch CVM products that interconnect with public cloud networks. But by 2015, the limited entries of OpenFlow flow tables on hardware SDN switches will no longer be able to support a large number of hybrid cloud requirements. So UCloud developed a server cluster using DPDK technology to replace the hardware SDN switch, and then more DPDK gateways appeared in the UCloud virtual network as a supplement to OVS.

In 2017, with the development of 25G network, the speed of network performance improvement has exceeded that of CPU. UCloud began to develop a virtual network solution based on hardware unloading, and finally confirmed that the direction is to promote programmable switches and intelligent network cards at the same time. What are the challenges encountered by the UCloud virtual network team in the process? What technical solutions are used to solve the problem?

By the end of 2017, the country began to vigorously promote the popularization of IPv6 (sixth Generation Internet Protocol) to deal with the restrictive problems such as the increasing shortage of IPv4 resources and the difficulty of ensuring the quality of service. Major operators and cloud manufacturers have started the upgrading of the new generation of IPv6 network. At present, UCloud has realized the IPv6 switching of some products on the cloud platform. However, because this process is not simply to replace IPv4 with IPv6, many underlying core technologies need to be upgraded according to the large number of addresses of IPv6. In the stage of transition from IPv4 to IPv6, how does UCloud ensure the smooth opening of the old business running on IPv4 and the new service switching to IPv6 network? And how to realize the evolution of the network from IPv4 to IPv6 on the cloud platform?

A conference will tell you how to get to the next generation network.

Xu Liang, head of UCloud virtual network platform, said: "from the earliest SDN and software vSwitch to intelligent network cards and programmable switches, software plays a more and more important role in the network." then under the trend of "Software is eating the network", how to provide users with a more secure, stable and highly available new generation network? What core network technologies need to be mastered in the future?

For more questions about the next generation virtual network, the "Product and Technology Special session" of Think in Cloud 2018 Shanghai Station and UCloud user Conference on December 21 will bring more detailed technical analysis. In addition, Yang Lang, vice president of UCloud, will also share an in-depth analysis of cutting-edge technology topics such as the design concept of UCloud minimalist products, next-generation computing and global infrastructure construction.

The following poster: which network technology does global SSH login use to achieve 0% packet loss and 28% input efficiency improvement? Who is the "Terminator of time" under the recovery rate of second-level fully automatic snapshot 60G/min? Who is causing trouble behind the 100% to 200% reduction in the impact of hardware isolation group outages and the 90% reduction in the number of memory-induced outages? Is the highest 50Gbit/s of 25Gbit/s intelligent network card true or false? Scan the QR code in the picture to "walk into the truth".

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.