Cisco WS-C2950-24 Hardware Installation Guide - Page 217
Online Insertion Removal and Hot-Swapping
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A A P P E N D I X Online Insertion Removal 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. Note OIR is only supported on the Cisco 3925, 3925E, 3945, and 3945E ISRs. The difference between hot-swapping and OIR is that OIR requires performing 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 3925, 3925E, 3945, and 3945E ISRs: • Service Modules • Network modules Note Network modules must be inserted into a network module adapter. The network module adapter and network module must always remain together. They function as one unit. • 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 an RPS OL-18712-02 Cisco 2900 Series and 3900 Series Hardware Installation Guide A-1