What is EOL and EOSL?
End of life usually marks the point at which a manufacturer no longer sells a product, and end of service life marks the later point at which it no longer supports it. After EOSL the vendor typically stops issuing firmware and security updates, stops accepting support cases, and may stop supplying spare parts. The product keeps working, but you carry the risk.
There is no single industry definition. Many vendors publish several milestones, such as end of sale, last date of support, end of software maintenance and end of hardware support, and the names differ between vendors. Some use EOL to mean end of sale only. Others use it to mean the end of everything. Always read the exact notice for the exact model.
Third party maintenance companies and field service providers can sometimes support hardware after EOSL, using spare parts and engineers outside the vendor program. This can extend the life of equipment, but it does not bring back vendor firmware updates or security fixes, so the risk is different and should be decided with the system owner.
How it shows up in practice
- Build an asset list with model, serial number, install date and the vendor's published EOL and EOSL dates, and review it at least once a year.
- Mark devices that reach EOSL in the next planning period, so refresh or replacement projects can be scheduled before support lapses.
- For out of warranty equipment, agree in the scope how repairs and spares are handled and who accepts the risk of no vendor support.
- Plan refresh work as a rollout with a pilot, a schedule, data handling and disposal of the old hardware.