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Routing & Switching · Foundational

Running Configuration

The active configuration held in RAM on Cisco IOS devices, distinct from the startup configuration stored in NVRAM.

Definition

Commands entered in configuration mode change running-config immediately. copy running-config startup-config (or write memory) saves it so it persists after reload. Junos and IOS XR differ by using commit-based candidate configurations.

Example

copy running-config startup-config

Exam tip

Unsaved running-config changes are lost on reload.

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