Cisco Systems ISR4451XK9 manual Online Insertion and Removal OIR Hot-Swapping, Requirement

C H A P T E R 7

Online Insertion and Removal (OIR) and

Hot-Swapping

Online insertion and removal (OIR) enables you to replace faulty modules without affecting system operation, which is similar to hot-swapping. OIR commands are issued before removing a module and after installing a module. When performing OIR, an identical module must be used to replace the original one. If performing OIR on multiple modules within a router, perform the operation on one module at a time.

Requirement

The module must be in energywise full-power mode for OIR commands to be issued. If the module is in energywise power-saving or shutdown mode, OIR commands can not be issued, and the module should not be removed.

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 items use OIR in the Cisco ISR 4451-Xs:

•Service Modules (SMs)

•Network Interface Modules (NIMs)

•External CompactFlash memory

•SFPs

•USB devices

The following items can be hot swapped:

•Fan tray

•Power supply—only when the router is backed up with the optional PSU

Hardware Installation Guide for the Cisco 4451-X Integrated Service Routers

OL-27644-01 7-1