Worried that one bad change could take your network down? Network configuration management means backing up device configs, tracking every change and enforcing a known-good baseline, so you can spot and undo mistakes quickly.
| Item | Value |
|---|---|
| Discipline name | Network configuration and change management (NCCM), a discipline in information technology |
| Scope | Change, inventory, crash and device management |
| Backups | Can be automated within an NCM system |
| Policy enforcement | Updates can be automated and policy compliance enforced |
| Inventory | Created automatically once devices are added |
These points come from TechTarget’s NCM definition and Wikipedia’s NCCM entry. Definitions and tool features change, so check the sources before you rely on them.
What network configuration management covers
Every router, switch and firewall runs on a configuration: addresses, routing, access lists, passwords, logging settings. Configuration management treats that text as an asset to be stored, versioned and controlled, not something that lives only on the device.
TechTarget says that network configuration management encompasses change management, inventory management, crash management and device management. In practice that gives you four jobs:
- Know which devices you have and what they run.
- Keep a copy of each configuration.
- Record who changed what, and when.
- Restore a working state after a failure.
Wikipedia describes NCCM as a discipline in information technology. Organisations use it to automate changes, reduce downtime, back up and restore device configurations, and meet compliance needs.
Core functions explained
Inventory and discovery
You cannot manage devices you do not know about. Per TechTarget, once devices are added, a device inventory is created automatically, which gives you a view of the network makeup.
Many teams feed that inventory from network discovery tools, which scan address ranges and report what answers. Unknown devices found this way are often the first configuration risk.
Configuration backup
A backup pulls the running configuration from each device and stores it, usually on a schedule. TechTarget notes that backups can be automated within an NCM system, often through third-party tools.
Keeping each backup as a separate version gives you a history. That history lets you compare today’s file with last week’s and find what changed.
Change tracking and drift
Drift happens when a device slowly departs from its intended setup, often through quick fixes made at the command line. Comparing stored versions, or reacting to a device’s change notification, exposes the difference.
Once a change is visible you can decide: approve it and update the baseline, or roll it back.
Compliance and policy
TechTarget points out that network devices might have to comply with industry standards, such as the Health Insurance Portability and Accountability Act or Payment Card Industry compliance. A tool can check each configuration against your rules, for example “no default passwords” or “logging enabled”, and flag devices that fail.
NCM can also automate configuration updates and enforce policy compliance, so a fix can be pushed to many devices instead of typed by hand.
A simple workflow to follow
You do not need a large platform to start. The order matters more than the tool.
- Inventory every device and record its role, owner and location.
- Back up each configuration on a schedule and after every approved change.
- Define a baseline: the approved configuration for each device type.
- Review changes by comparing versions, and ask who requested each one.
- Test a restore on a spare or lab device, so you know the backups work.
Keep the first pass small. Pick one site or one device family, get the inventory and backups right there, and only then widen the scope. A narrow start gives you real experience with naming, access and storage before the volume of devices makes mistakes expensive.
Write down who owns each step, too. When a backup job fails at night, someone should be named as responsible for noticing it and fixing it, or the gap will quietly stay open for months.
The last step is the one most often skipped. A backup you have never restored is an assumption, not a safeguard.
Common mistakes to avoid
Most configuration problems come from habits rather than from missing software. These are the patterns that cause the most trouble.
- Backing up but never comparing. Stored files that nobody reads give you recovery, but not awareness of change.
- Treating the running config as the only truth. If a device reboots without its saved startup file matching, a change can vanish.
- Sharing one admin account. Without individual logins, a change history cannot say who made an edit.
- Skipping documentation. A diff shows what changed, not why, so record the reason beside each approved change.
- Storing backups beside the device. Keep copies somewhere that survives the failure you are protecting against.
Configuration files often contain secrets such as community strings and keys. Restrict who can read the backup store as tightly as you restrict the devices.
Building a change process around the tool
A tool records changes, but a process decides which ones should happen. Even a light process lowers risk.
Write down a short request for each change: what, why, when and how to undo it. Have a second person review anything touching routing, firewalls or access to management interfaces.
After the change, compare the new backup with the previous one and confirm that only the intended lines differ. If extra lines appear, someone made an unplanned edit, and you want to find out before it becomes the new normal.
Review the baselines on a regular rhythm as well. Software upgrades, new services and retired links all make old baselines out of date, and a stale baseline produces noisy drift alerts that people learn to ignore.
Where it fits with other tools
Configuration management is one part of the wider toolset described in our guide to network management software. Monitoring tells you a device is down; configuration management helps explain whether a change caused it.
When a problem is not visible in the configuration, a packet analyzer shows what is actually crossing the wire. The two views complement each other: the config says what the device should do, and packets show what it did.
Choosing and adopting a tool
Whatever product you evaluate, check a few practical points before committing:
- Does it support the vendors and operating systems you actually run?
- How does it store credentials, and can it limit who may push changes?
- Can it show a clear side-by-side comparison of two versions?
- Can it alert you to a change, and does it keep an audit trail?
- Does it check configurations against your own rules, not only built-in ones?
Start with read-only backup and comparison. Add automated changes only once your baselines are trusted, because automation spreads a mistake as fast as it spreads a fix.
Frequently asked questions
Is network configuration management the same as monitoring?
Show answer
No. Monitoring watches device health and traffic. Configuration management stores, compares and controls the settings that devices run on.
What does NCCM stand for?
Show answer
Network configuration and change management. Wikipedia calls it a discipline in information technology.
Can backups be automated?
Show answer
Yes, and scheduled automation is the usual approach, since manual copies are easy to forget.
Do small networks need it?
Show answer
A small network still benefits from saved, versioned configs and a written baseline. A spreadsheet inventory and scheduled backups are a reasonable start.
