Most outages are fixed by changing something on a switch, router or firewall. The problem is that those devices are usually reached over the same network that just went down. Out-of-band management, or OOBM, is a separate path that lets engineers in when the main path is gone.
What out-of-band management is
An OOBM network connects to the management or console ports of critical equipment and reaches the internet over its own link, completely apart from production traffic. When the primary circuit, a core switch or a misapplied configuration takes the site offline, engineers can still log in, see what happened and roll it back.
Why it matters
- Faster recovery. A remote fix takes minutes. A truck roll to a remote site can take hours or days.
- Safer changes. Teams can make changes knowing they will not lock themselves out.
- Day-one access. New builds can be managed before permanent circuits are lit.
- Lower travel costs. Fewer emergency site visits for problems that a console session could solve.
Choosing the OOBM connection
The out-of-band link should share nothing with the production network. Cellular is the most common choice because it is quick to install and independent of local wiring. For larger sites, two cellular links bonded together give more capacity and resilience, and satellite can add a further independent path where coverage is weak.
Data center builds
A new data center needs connectivity on day one so switches and hardware can be provisioned, long before permanent circuits are delivered. The same links can then stay in place as backup internet and as the out-of-band path for the life of the facility.
SimpleCom delivered two bonded multi-gig circuits for backup internet and out-of-band management at a hyperscale data center build, with the bonding instance hosted by SimpleCom. Read Day-one connectivity for a data center build.
Planning checklist
- List every device that must be reachable when production is down.
- Give the OOBM network its own internet link on a different technology.
- Secure it tightly, since it reaches your most critical equipment.
- Monitor it continuously so it is ready when it is needed.
- Document access so the on-call engineer can use it under pressure.
Common questions
Is out-of-band management only for data centers?
No. Any remote site with critical network equipment benefits, including branches, towers, plants and utility sites.
Does OOBM need a lot of bandwidth?
Basic console access needs very little. Larger sites that use the same link for backup internet need more, which is where bonding helps.
Need a path in when everything else is down?
One team to survey, install and support every site, on your timeline.