4-13
Software Configuration Guide—Release 12.2(25)EW
OL-6696-01
Chapter 4 Configuring Interfaces
Understanding Online Insertion and Removal
Understanding Online Insertion and Removal
The online insertion and removal (OIR) feature supported on the Catalyst 4500 series switch allows you
to remove and replace modules while the system is online. You can shut down the module before removal
and restart it after insertion without causing other software or interfaces to shut down.
You do not need to enter a command to notify the software that you are going to remove or install a
module. The system notifies the supervisor engine that a module has been removed or installed and scans
the system for a configuration change. The newly installed module is initialized, and each interface type
is verified against the system configuration; then the system runs diagnostics on the new interface. There
is no disruption to normal operation during module insertion or removal.
If you remove a module and then replace it, or insert a different module of the same type into the same
slot, no change to the system configuration is needed. An interface of a type that has been configured
previously will be brought online immediately. If you remove a module and insert a module of a different
type, the interface(s) on that module will be administratively up with the default configuration for that
module.
Monitoring and Maintaining the Interface
The following sections describe how to monitor and maintain the interfaces:
• Monitoring Interface and Controller Status, page 4-13
• Clearing and Resetting the Interface, page 4-14
• Shutting Down and Restarting an Interface, page 4-14
Monitoring Interface and Controller Status
The Cisco IOS software for the Catalyst 4500 series switch contains commands that you can enter at the
EXEC prompt to display information about the interface, including the version of the software and the
hardware, the controller status, and statistics about the interfaces. The following table lists some of the
interface monitoring commands. (You can display the full list of show commands by entering the show ?
command at the EXEC prompt.) These commands are fully described in the Interface Command
Reference.
To display information about the interface, perform this task:
Command Purpose
Step 1
Switch# show interfaces [
type slot/interface
]
Displays the status and configuration of all interfaces or of a
specific interface.
Step 2
Switch# show running-config
Displays the configuration currently running in RAM.
Step 3
Switch# show protocols [
type slot/interface
]
Displays the global (system-wide) and interface-specific
status of any configured protocol.
Step 4
Switch# show version
Displays the hardware configuration, software version, the
names and sources of configuration files, and the boot images.
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