Should programmers learn CCIE?

Undergraduate is a software major, but because of family reasons, I introduced to a communication company and got in touch with IE. I feel that it may be very good if I can pass the exam. Related?

Cisco's world's largest R & D center is in San Jose, USA, and the second R & D center is in Shanghai, China, with more than 2,000 people. The department where it used to be was the routing and switching infrastructure department, with more than 200 people. What are these 200 people doing?

Mainly responsible for the research and development of global DMVPN, MGRE, SD-WAN, Multicast VPN, MPLS VPN, Layer 2 MPLS VPN. If you are sensitive to these keywords, you may know the weight of these R & D personnel in the company. In my mind, there will be a lot of scenes where cattle are gathered. At that time, I thought so too, so I had the passion and motivation to join Cisco. One day my colleagues chatted together during lunch and talked about Cisco's powerful people. Say you see, that small office sits with 5 CCIE titles. Previously from a software background, he has been with Cisco for 18 years and is comparable to the salary of the department boss. He once participated in his technical lectures, which is very powerful and admire them. As a software background, as long as you have passed the IE certification, all of you have changed jobs. The rest of the gang is not certified by IE. At that time it was very surprising, what are the characteristics of programmers? The level of code is very powerful. Say a requirement, and soon you can type out hundreds or thousands of lines of code to achieve the requirement. But programmers have a shortcoming, that is, they do not understand the underlying network. Once a thorough understanding of the underlying network, coupled with superb code capabilities, everywhere is a good person. Recognizing the above facts, it was discovered through several network troubleshooting cases.

DMVPN

There is a colleague who is responsible for developing VRF-Aware DMVPN, but also has to set up a test platform to test it. So I went up and tried it. At that time, I did n’t touch DMVPN, but with the knowledge of MGRE, IPsecVPN, and VRF-Lite, I vaguely felt that his VRF-related configuration had a problem, so I added a line of configuration, so the printouts rolled over the screen instantly. , DMVPN is finally up. VRF was first used in MPLSVPN to isolate customer private routes, but was also used by DMVPN for reference. Later, VRF-Lite spread to data center equipment. Multicast VPN This colleague is responsible for the development of this segment. This technology is actually using the operator's multicast tunnel in the core network to transmit the user's private multicast messages, and that's all. This colleague and the remote Indians debugged together, and they did not get up all afternoon. Later I heard that I had trained Multicast for the department, so I found help to debug together. In fact, I am very happy to debug, because I can test whether my theory is solid. In fact, no matter what kind of communication, there are control channels and data channels, and some people write "control plane" and "data plane".

In the eyes of operators, the IP packets we send on the Internet are all user data planes. To serve these IP packets well, the operator must get through the global routing, so that the router has global routing, and the synchronization of the global routing table requires routing control packets. These control packets are the control channels.

Therefore, in order for the user's IP information to work properly, the control message must be made to work properly. This is the cause and effect. The above is a macro perspective. If viewed from a micro perspective, a user session is divided into a control plane and a data plane. For example, TCP three-way handshake to establish a connection, ACK confirmation, Reset connection, and four waves to close the connection, these are the control plane, and it is the data plane that really transmits the http data. Similarly, Multicast VPN communication also has a control plane and a data plane. For the data plane to work properly, you must first ensure the normal operation of the control plane. First, the multicast control tunnel must be up. If the UP is up, even if the multicast data and the control tunnel share the same tunnel, it is still possible to re-establish a multicast data tunnel. Following this principle, I started troubleshooting step by step, and told my colleagues before adding the last line of configuration: If the UP cannot be up, then I can't help! After knocking on the last line of configuration, the printout is constantly refreshing, both multicast tunnels are up, and video programs pushed from the multicast source are continuously pushed to the client at the source. Indians don’t forget to give thumbs up: "Fantastic"! Internet technicians, whether they are software developers or network design and operation and maintenance personnel, all have a common goal: to push data to their destinations in a safe, reliable, and fast manner in real time. If software developers understand their code thoroughly It is very popular to understand how the messages generated by the code travel through the network.

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