At Cisilion, we’ve had countless conversations with customers about ageing network infrastructure. More often than not, the discussion starts with a perfectly reasonable question:
“Why do I need to replace it? It’s still working.”
And, on the face of it, that’s a fair challenge. Networks are often victims of their own success. When they are running well, nobody really notices them. Switches, routers, wireless infrastructure and firewalls can sit quietly in the background for years without causing any obvious problems, so there is a natural temptation to leave them alone for as long as possible. But at Cisilion, we encourage customers to look beyond whether the network is still passing traffic today. Once equipment reaches Last Day of Support (LDOS), the conversation is no longer simply about refresh cycles or keeping up with the latest features. It becomes a conversation about business risk, resilience and whether the network is still fit for what the organisation needs next.
The hidden problem with “working fine”
One of the biggest misconceptions is that the age of a device only matters when it fails. In reality, the risk starts building much earlier. When a manufacturer reaches the end of support for a product, the level of software development, bug fixing and security remediation available for that platform changes significantly. The equipment may continue to function exactly as it did yesterday, but the environment around it certainly hasn’t stood still.
Still working...but not longer supported
Still Working
Passing traffic ✓
Users connected ✓
No obvious faults ✓
No longer Supported
⚠ Reduced vendor support
⚠ Limited security remediation
⚠ Emerging vulnerabilities
⚠ Increasing operational risk
New vulnerabilities are discovered. Threats evolve. Security requirements change. Regulatory expectations increase.
Meanwhile, that device sitting in the network is effectively becoming a fixed point in a changing environment.
That doesn’t necessarily mean it will fail tomorrow. It means that if a new vulnerability is discovered, your options for dealing with it may be increasingly limited.
And that is where the real problem starts.
Security becomes a bigger exposure
Cybersecurity is no longer just about endpoint protection and user awareness. The network itself is an important part of an organisation’s security posture.
Network infrastructure sits at the centre of almost everything an organisation does. It connects users, applications, devices, data centres and cloud services. It also plays an important role in segmentation, access control, monitoring and visibility.
When a vulnerability is discovered in supported equipment, there is at least a defined route to remediation, whether that is a software update, configuration change or other vendor-supported mitigation.
With unsupported equipment, those options become much more limited.
Organisations can therefore find themselves relying on infrastructure with known vulnerabilities, or on platforms for which future security issues may not be addressed by the manufacturer.
That’s not simply a technology problem.
It’s a business risk.
Security isn’t the only consideration. Many organisations are under increasing pressure from auditors, insurers, customers and regulators to demonstrate that cyber risk is being actively managed.
Questions Becoming Increasingly Common
Unsupported infrastructure can leave fewer options when issues or vulnerabilities arise.
Without ongoing vendor support, the route to patches, fixes and remediation may become limited.
Ageing infrastructure can make it harder to demonstrate that technology risk is being actively managed.
A planned approach lets you prioritise risk rather than waiting for ageing infrastructure to become an incident.
When infrastructure reaches LDOS, answering those questions becomes more difficult.
We’ve seen organisations invest heavily in cybersecurity tooling, monitoring and compliance programmes, only to discover that ageing network infrastructure remains one of the unresolved risks within the estate. It can be easy to focus on the latest security technology while overlooking the equipment that has been sitting in the network for years. That is why Cisilion takes a joined-up view: understanding where support risk sits, how it affects the wider security posture and which assets should be prioritised rather than treating every refresh as a like-for-like replacement exercise.
Downtime risks increase over time
When supported equipment fails
✓ Replacement options
✓ Engineering expertise
✓ Vendor escalation route
When unsupported equipment fails
⚠ Vendor escalation may no longer be available
⚠ Greater reliance on ageing/spare equipment
⚠ Incident response becomes more complicated
That is not a position most IT leaders want to find themselves in during a major incident.
A modern network is about more than connectivity
Organisations are increasingly looking at AI, automation, Zero Trust, stronger security, better application performance and more consistent digital experiences for their users. All of these initiatives depend, to some extent, on the underlying network. At Cisilion, we see the network as more than a connectivity layer: it is the foundation that enables secure access, cloud adoption, modern collaboration and future AI initiatives.
Surrounding Areas:
Supporting stronger security and Zero Trust ambitions.
Providing the connectivity and visibility modern cloud environments depend on.
Supporting consistent experiences across users, locations and applications.
Creating stronger foundations for automation and future AI initiatives.
Modern platforms can provide greater visibility and automation, alongside capabilities such as network analytics, segmentation, application performance monitoring and integration with wider security platforms. Older platforms may still be perfectly capable of moving traffic, but that does not necessarily mean they can provide the visibility, automation and security capabilities that the organisation and its operations team now need.So the question is not only
“What happens if this equipment fails?”
It should also be
“What are we unable to do because this equipment is holding us back?”
Ultimately, replacing LDOS equipment is not about upgrading simply because a vendor says you should, and it should not be about chasing the latest technology for the sake of it.
Cisilion helps customers turn LDOS from a deadline into a practical roadmap:
Understand where the exposure sits.
Focus on the areas of greatest business risk.
Build a transition aligned with wider security, cloud and workplace ambitions.
It's about...
- making sure the infrastructure supporting the business remains secure, supportable and resilient.
- having a clear route to address vulnerabilities when they emerge.
- reducing the risk of an avoidable outage.
- making sure the network continues to enable the organisation rather than quietly becoming a source of exposure.
After all, the biggest risk in an ageing network isn’t necessarily the equipment that has already failed.
It can be the equipment that is still working perfectly but is no longer being properly supported or protected. The right time to address that risk is before it becomes an incident. Cisilion can help you understand where the exposure sits, what to prioritise and how to build a network roadmap that supports the business today and what comes next.