Understanding Online Insertion And Removal - Cisco Catalyst 4500 series Administration Manual

Chapter 8 Configuring Interfaces
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 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 OIR process may take up to 70 seconds before the newly
installed module is initialized. Each interface type is verified against the system configuration, after
which 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.
Online Insertion and Removal on a WS-4500X-32
You must initiate an uplink module removal procedure on a WS-4500X-32 (the Catalyst 4500-X Series
Switch) either through a CLI (below) or through the OIR button on the front panel of the uplink.
Unscheduled uplink module removal is not supported because the C4KX-NM-8 module has hardware
Note
communication lines to the baseboard that cannot be unplugged in an online state. Communication must
be stopped first.
Before removing the uplink module, you must press the OIR button for 5 seconds, and wait for the OIR
LED to turn Green. Removing a module without pressing the OIR button causes the system to reboot to
ROMMON with the following console error message:
Kernel panic - not syncing: Removing a module from switch causes instability.
Rebooting in 15 seconds...
No special steps are needed for insertion.
Note
With Cisco Release IOS XE 3.3.0SG and IOS 15.1(1)SG, two CLI's are introduced: hw-module module
number start and hw-module module number stop. For the number keyword, the only applicable value
for WS-C4500 is 2. With Cisco Release IOS XE 3.3.0SG and IOS 15.1(1)SG, the start and stop
commands are only enabled on the uplink module of WS-4500X-32.
For details, please refer to the hardware portion of the documentation library:
http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_installation_guides_list.html
OL-30933-01
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
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
Understanding Online Insertion and Removal
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