The online insertion and removal (OIR) feature allows you to remove and replace modules while the system is online. You can shut down the modules before removal and restart them after insertion, without causing other software or interfaces to shut down.
Do not remove or install more than one module at a time. After you remove or install a module, check the module LEDs before continuing.
When a module is removed or installed, the switch stops processing traffic for the module
and scans the system for a configuration change. Each interface type is
verified against the system configuration, and then the system runs diagnostics
on the new module. There is no disruption of normal operation during module
insertion or removal.
The switch can bring
up only an identical replacement module online. To support the OIR of an identical
module, the module configuration is not removed from the running-config file
when you remove a module.
If the replacement
module is different from the removed module, you must configure it before the
switch can bring it online.
Layer 2 MAC addresses
are stored in an EEPROM, which allows modules to be replaced online without
requiring the system to update switching tables and data structures. Regardless
of the types of modules installed, the Layer 2 MAC addresses do not change
unless you replace the supervisor engine. If you do replace the supervisor
engine, the Layer 2 addresses of all the ports change to those specified in the
address allocator on the new supervisor engine.