Online Insertion And Removal (Oir) - Cisco 7000 Series Hardware Installation And Maintenance Manual

Functional Overview
Storing the MAC addresses for every port in one central location on the RP also means that the MAC
addresses stay with the RP on which they are stored. If you replace the RP, the addresses of all ports
will change to those specified in the address allocator on the new RP. Because the system
configuration is also stored on the RP (in NVRAM) and stays with the RP when you remove it, you
will need to reenter the configuration if you replace the RP.
Before replacing an RP, you must back up the running configuration to a TFTP file server so that
you can later retrieve it. If the configuration is not saved, the entire configuration will be lost—inside
the NVRAM on the removed route processor—and you will have to reenter it manually. This
procedure is not necessary if you are temporarily removing an RP you will reinstall; lithium batteries
retain the configuration in memory until you replace the RP in the system.

Online Insertion and Removal (OIR)

The OIR function allows you to install and replace interface processors while the system is
operating; you do not need to notify the software or shut down the system power. All CxBus interface
processors (AIP, CIP, EIP, FIP, FSIP, HIP, MIP, and TRIP) support OIR. The following is a functional
description of OIR for background information only; for specific procedures for installing and
replacing interface processors on line, refer to the section "Online Insertion and Removal
Information" in the chapter "Maintenance."
All CxBus interface processors support OIR; however, you must shut down the system before
removing or installing the RP or SP (or SSP), both of which are required system components.
Removing an RP or SP (or SSP) while the system is operating will cause the system to shut down or
crash, and might damage or destroy memory files.
Each RP, SP (or SSP), and interface processor contains a bus connector with which it connects to the
system backplane. The bus connector is a set of tiered pins, in three lengths. The pins send specific
signals to the system as they make contact with the backplane. The system assesses the signals it
receives and the order in which it receives them to determine what event is occurring and what task
it needs to perform, such as reinitializing new interfaces or shutting down removed ones.
For example, when you insert an interface processor, the longest pins make contact with the
backplane first, and the shortest pins make contact last. The system recognizes the signals and the
sequence in which it receives them. The system expects to receive signals from the individual pins
in this logical sequence, and the ejector levers help to ensure that the pins mate in this sequence.
When you remove or insert an interface processor, the backplane pins send signals to notify the
system, which then performs as follows:
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OIR functionality enables you to add, remove, or replace interface processors with the system
online, which provides a method that is seamless to end users on the network, maintains all routing
information, and ensures session preservation.
When you insert a new interface processor, the system runs a diagnostic test on the new interfaces
and compares them to the existing configuration.
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Rapidly scans the backplane for configuration changes and does not reset any interfaces.
Initializes all newly inserted interface processors, noting any removed interfaces and placing
them in the administratively shutdown state.
Brings all previously configured interfaces on the interface processor 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 a similar interface
processor type has been reinserted into a slot, then its ports are configured and brought on line
up to the port count of the original interface processor.