Online Insertion and Removal

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Online Insertion and Removal (OIR), is a concept in Cisco devices that allows expansion cards to be removed or inserted into a running device without requiring a reboot or causing interruption in services provided by said device. However, in reality, it is best to remove or insert cards while the device is powered off; Cisco's own documentation states "If the OIR is successful, there is absolutely no need to schedule a reload of the router."

[edit] References

http://www.cisco.com/warp/public/63/oir_17940.shtml