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Hardware Installation Guide for Cisco 4000 Series Integrated Services Routers
OL-32185-02
APPENDIX
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Online Insertion and Removal and
Hot-Swapping
The online insertion and removal (OIR) operation lets you replace faulty data and voice modules without
affecting system operation. The OIR is similar to hot-swapping. OIR commands are issued before
removing and after installing a module. When performing OIR, use an identical module to replace an
original one. If you need to perform OIR on multiple modules within a router, perform the operation one
module at a time.
The difference between hot-swapping and OIR is that OIR requires performing Cisco IOS commands
before and after the OIR. Hot-swapping is strictly a hardware function and requires no commands. Not
all router components or modules use OIR, or can be hot swapped.
The following components use OIR in the routers:
• Service Modules (SMs)
• Network Interface Modules (NIMs)
• SFPs
• USB devices
The following components can be hot swapped:
• Fan tray
• Power supply—only when the router is backed up with an optional PSU
Requirement
To issue OIR commands, you must keep the module that is to be replaced in EnergyWise full-power
mode. If the module is in EnergyWise power-saving or shutdown mode, you cannot issue OIR
commands, and you cannot, therefore, remove the module.
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