The course content of EI also focuses on the enterprise network architecture. The difference is that it is a new enterprise network architecture, which adds the software definition of SDN technology, and the software definition of SDN technology accounts for 25% of the content in the exam. In the changes of the routing part, EIGRP does not focus on learning, but only requires the learning of this routing protocol by “understanding EIGRP”. In addition, OSPF and BGP are still compulsory. As shown in the standard teaching requirements of EI, the CCNP course in the RS theory learning stage that we originally focused on is now only required to be completed in five full days. It can also be seen that Cisco believes that after 20 years of RS technology promotion, the popularity of CCNP has been very mature. No longer need to spend too much time to study it, but more time should be spent on the study of new SDN technologies.
How to define VXLAN or explain VXLAN?
VXLAN is a network virtualization technology, which can be used to improve the expansion of large-scale cloud computing during deployment. It is an extension of VLAN. It can solve the portability limitation of VMS (Virtual Memory System) by encapsulating traffic and extending it to the third layer gateway, so that it can access servers on the external IP sub-net.
VXLAN (Virtual Extensible Local Area Network) technology solves the problem that the existing VLAN technology can not meet the needs of the second-tier network. The main principle is to introduce an outer tunnel in UDP format as the data link layer, and the original data message content is transmitted as the tunnel payload, which is a large two-layer virtual network technology. Because UDP is used as the transmission method in the outer layer, the payload data can be easily transmitted in the layer 2 and 3 network.
Unlike traditional VLAN, VXLAN has the following characteristics.
(1) It greatly expands the number of layer-2 network segments
The 24-bit VVNI identifier of VXLAN technology provides 16 million VXLAN network segments, far more than 4094 VLAN. It can meet the needs of multi-tenant network segment separation in the data center. The necessary content of new version of Cisco EICCIE Certification industry infrastructure.
(2) Its greater flexibility
The original virtual machine migration can only be carried out on the layer-2 network of the same network segment, which is seriously limited by geographical location. VXLAN uses tunneling technology to build a virtual layer-2 network that can span multiple layer-3 networks, and virtual machines can disperse data in physical locations.
Migration between centers makes the deployment of virtual machines more flexible and convenient.
(3) Its optimized network operation
Because VXLAN operates on the standard layer-3 IP network, it is no longer necessary to build and manage the huge layer-2 basic transport layer.
(4) Its economy
VXLAN is managed by the virtual machine management program inside the physical server, which is transparent to virtual machines and ordinary network devices (such as physical switches and routers), and there is no need to upgrade and transform the existing physical switches and routers in terms of hardware. The necessary content of new version of Cisco EICCIE Certification industry infrastructure. spotoclub.com
