Cisco Systems 4500 Understanding Online Insertion and Removal, Monitoring and Maintaining the Interface

6-30
Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 6 Configuring Interfaces
Understanding Online Insertion and Removal
0 input packets with dribble condition detected
3552 packets output, 269088 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
1 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Switch#
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 remov al
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 is brought online immediately. If you remove a module and insert a module of a different type,
the interface(s) on that module is 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 6-30
• Clearing and Resetting the Interface, page 6-31
• Shutting Down and Restarting an Interface, page 6-31
• Configuring Interface Link Status and Trunk Status Events, page 6-32
• Resetting the Interface to the Default Configuration, page 6-34
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.