Cisco 4451 ISR User Manual

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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.

Cisco 4451 ISR Specifications

General

Brand	Cisco
Model	4451 ISR
Category	Network Router
Language	English