Managing configurations on line cards
When an line card (interface module) boots up in a slot which was never occupied previously or is not configured, the module type is automatically saved in the configuration database. The type configuration associated with a given slot persists in the database even after the line card is physically removed, powered off, or faulted. This mechanism ensures that all configuration data associated with a given slot is automatically preserved across reboots or hot swaps with the same type of line card.
If you insert an line card in a slot that was previously occupied by a module of a different type, the line card will be faulted with a "type mismatch" error. Before you replace an line card with a different type, you must clear the existing type configuration from the database. Refer to Replacing an interface module for more information.