The old system can't be a one-size-fits-all. It's normal to live together.
Many colleges are not white paper, and there are old NATSHELLs running through hot spots in cities, with tens of thousands of teachers and students' accounts and historical bills on them. Direct replacement risks are high: failure to cut the whole school network, failure to match old bills, and a telephone call for transport.
How did Radius Proxy connect the two systems?
The typical structure is the front-end proxy plus backside. The new system is a Radius Proxy server, with the original urban hotspot system as the back end AAAA. The teacher/student terminal initiates requests through AP to transfer access switches to the new system; the new system sets up pre-packaged Proxy rules and encapsifies the old system ' s request into standard Radius packages, which verify account numbers for password packages and returns to pass or rejection; the new system converts results to end-recognizing format feedback users.
The rules of diversion determine who goes to the old system.
Proxy’s core is to transmit it by rules, with a fine distinction between users who walk the original system and users who take the new system. There are three common sets of rules: user range, such as old account prefixes, specific home identification requests for conversion systems; access area, VLAN, an old teaching building that did not complete the coverage of the new system; terminal type, fixed end-to-end transfer systems that bind the defined system. The rules support multiple conditions, which wrongly mix up and turn the new user into an ageing system or vice versa. Rules are configured in line with researchable and offline lists of accounts, which do not allow for headshots.
The billing data cannot be broken. The historical bills must be complete.
After the certification was passed, the new system will be billed to the original system at the start and end of the billing fee of RFC 2866, with online time and traffic on board, and will preserve the historical bills of the original system. A copy of the new system will be stored locally in a synchronized format to avoid malfunctions of the original system and no charges will be charged. Data consistency is a pit: what if two passwords change? The standard practice is that Proxy will record data discrepancies logs and report consistency daily; when the former system fails temporarily, the cache period allows users to provisionally authenticate their experiences over a period of time.
High-availability and regression mechanisms must be predefined
The new system gives the original system a 10-second beat of Radius heart, triggering three consecutive failures and cutting requests to local authentication caches and warning; in the case of clusters, Proxy has multiple backend IPs for rotation or weighting; the new system itself is hot for two engines, the main node failure nodes take over within ten seconds. The deployment phase is three: side by side, test users only, then cut into regional batches, priority accommodation areas and retain retrenchment, with full takeover and transition to historical queries nodes. The retreat window and rollback mechanism are written before the cutoff, not out of question.
The upgrades can be phased, but not zero.
The ability to upgrade and co-exist, by the calibre of the boundary, depends on the properties map, the conditions for alignment and the integrity of the retreat. Zero conversions are prohibited, direct migration without connection, access to old systems is not allowed, and any old system can be connected unconditionally. Inconsistent settings, protocols, accounts, and systems are normal. This part of the workload is clear. Upgrades are phased in, with key to parallel storage strategies, mapping rules and bonding plans, rather than a one-key replacement old system for new systems.
How do you solve a data conflict? You need to prep it.
The most realistic conflict is not that the passwords are not synchronized, but that the accounts are inconsistent in two systems: for example, students have sold out on the original system and the new system has been shown to be effective; or the balance of the two sides of the package has failed to match. It is standard practice for Proxy to use the response of the previous system and write each discrepancy into a data variance log, with daily consistency reports. But there are insufficient reports, and it is only when an exception is frozen in the implementation document that the transport will be in conflict.
The implementation cycle is real.
The upgrade is not done in a week. One-to-two-week data survey and operator docking confirm that the relay development is two to three weeks of interfaces and at least three rounds of pressure tests per model, trial operation of two-week residential building for 500 to 1,000 user field verification, full-line one-week block cuts by region and on-site. The total cycle is six to eight weeks. School rehearsals are set up with a combined checkup and test run, which is equivalent to a full-scale switch. Double-track backup strategy (full incremental, 90 days or more) is the bottom line.
Backsliding is more important than moving forward.
Stock improvement is most feared if it does not. At every stage, the mechanism of back-trenchment is retained: the old system is still online, and the old system is not cut in half when batches are done, and the older system takes full custody of the system before turning historical queries instead of directly down. Rollback windows, rollback steps, and those responsible are written in front of them. Cutting off the day, dropping the preset, without taking a live shot at the head. An upgrade that can be returned is an acceptable upscale, or one failure will be the worst for all schools.
The old system has to be out of order.
After full takeover, the original urban hotspot system is not to be directly offline and turned into a historical data query node, with old bills and history records available. The parallel steady running for some time, consistent reporting, and then retirement are evaluated. Even if there is an old system problem, audit and accounting will remain intact.