This post was originally published on ZPE Systems
Out-of-band monitoring is a network management strategy that uses a dedicated management network, separate from the production network, to monitor and manage critical infrastructure. Whereas in-band monitoring relies on the same data network used by users and applications, out-of-band monitoring remains isolated and operational even if the main network is down.
How does out-of-band monitoring connect to devices?
Console Access via Serial Ports: Out-of-band monitoring uses serial console ports on routers, switches, firewalls, and servers to provide direct access to the device’s command-line interface (CLI). This connection bypasses the primary network entirely. Dedicated Management Interfaces: Many modern devices come with a dedicated management Ethernet port (e.g., Cisco’s management interface or HP iLO for servers). These ports are linked to an out-of-band network, allowing secure remote access. Secure Remote Access Gateways: Centralized console servers or remote access gateways aggregate connections to multiple devices, making it easy to manage a large number of endpoints from a single interface.
Teams can gain remote access to out-of-band console servers via dedicated cellular, ISP, Starlink, or other connection that is separate from the main network.
Image: An out-of-band network provides dedicated connectivity that’s separate from the main network. NOC admins can gain access
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