1. Network Cutover OverviewI want to make it clear that the concept of "network" . It does not refer to small-scale networks such as small home broadband, but large and medium-sized commercial networks, such as enterprises, financial institutions, government agencies, and large-scale educational parks,etc. Small home network that maybe you can succes, you will not be able to get online but the network of business and business needs professional technical services.Suppose we have such a customer, the customer has a new park just completed. The park includes a number of buildings, and the geographical coverage is also wide. We will not be able to build the construction of the park. After the park is completed, it will definitely need a dedicated network to carry the company's business traffic which may be wireless or wired, or a wired or wireless converged network. In any case, it is definitely necessary to have a large-scale campus network to carry electronic business interaction data. At the very least, users in the park always have to go online.Then, there is the demand for network construction and the sales behavior of network products or solutions. Here we ignore the sales link directly, and now assume that all pre-sales and sales links are fixed. Then,the next step is the implementation of the new network. After the completion of the network, there is still one piece of service delivery which is to train customers. The training content is about the implementation, usage and maintenance methods of related products on the network. The network is used immediately. During the use, there may be some small adjustment requirements, such as the addition of VLANs and IP address segments. This is network maintenance. Moreover, the network will inevitably fail so you need to do the troubleshooting.Moreover, if the network needs to be modified, upgraded, migrated, etc. After the network is running for a period of time and the network operation behavior occurs on a network that is carrying traffic, the behavior is called cutover. . Network cutover actions may be to adjust the network structure, add or replace network devices, change lines, change device configurations or other network-specific changes. Network cutover is a relatively difficult action. Especially when dealing with the core network of operators, finance, government or large enterprises. Every cutover action needs to be very cautious, because if the operation fails, the impact is Very far-reaching. Therefore, network cutover, put forward certain requirements for the technical, physical, mental, and experience of the professional engineers.
What should be paid attention to the network cutover solution?The plan is just a delivery of thoughts. Sometimes to the customer, sometimes to the leader. Of course, the key is to fully understand the entire cutover process. In general, the outline of a cutover plan may look like this (That also depending on the specific Conditional):1) Document purpose2) Project backgroundl Network statusl Network topologyl IP and VLAN informationl Routing and data directionl Device configuration backupl Device connection and interface description Cutover targetl Transformed network topologyl IP and VLAN informationl routing modell Data trendl Added device model and version informationl Device management information4) Implementation processl Step 1: xxxx; (including the fallback plan)l Step 2: xxxx; (including the fallback solution)l Step 3: xxxx; (including the fallback solution)l Step 4: xxxx; (including the fallback solution)l ......5 Test case6) Cutover progress and responsibilities of all parties7) Test environment and script8) Other deliverablesPASSHOT just not can help you to pass the CCIE lab exam, many network technical documents also can help you when you work!
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