Interface Module Installation - Cisco ASR 903 Installing Manual

Hot-Swapping an RSP Module
Hot-Swapping an RSP Module
The Cisco ASR 903 Router provides a feature that allows you to remove and replace a redundant RSP module
without powering down the router. This feature, called hot-swapping or OIR, allows you to remove and replace
a redundant module without disrupting router operation.
When two redundant modules are installed in the router, only one of the modules is active. The other one runs
in standby mode, ready to take over processing if the active module fails.
When you remove or insert a redundant module while the router is powered on and running, the router does
the following:
1 Determines if there is sufficient power for the module.
2 Scans the backplane for configuration changes.
3 Initializes the newly inserted module. In addition, the system notes any removed modules and places those
modules in the administratively shutdown state.
4 Places any previously configured interfaces on the module back to the state they were in when they were
removed. Any newly inserted interfaces are put in the administratively shutdown state as if they were
present (but unconfigured) at boot time. If you insert the same type of module into a slot, its ports are
configured and brought online up to the port count of the original module.
The router runs diagnostic tests on any new interfaces and the test results indicate the following:
• If the tests pass, the router is operating normally.
• If the new module is faulty, the router resumes normal operation but leaves the new interfaces disabled.
• If the diagnostic tests fail, the router stops operating, which usually indicates that the new module has

Interface Module Installation

The following sections describe the various tasks of associated with interface module installation on the Cisco
ASR 903 Router:
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
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a problem in the bus and should be removed.
Installing the Cisco ASR 903 Router