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Online Insertion and Removal
Figure 3-1
Online Insertion and Removal
The Cisco 7200 series routers, Cisco 7200 VXR router, and Cisco uBR7246 router support the OIR of
all module types. Therefore, you do not have to power down routers when removing and replacing
modules in these chassis.
It is wise to gracefully shut down the system before removing a port adapter that has active traffic
moving through it. Removing a module while traffic is flowing through the ports can cause system
disruption. Once the module is inserted, the ports can be brought back up.
As you disengage the module from the router or switch, online insertion and removal (OIR)
Note
administratively shuts down all active interfaces in the module.
OIR allows you to install and replace modules while the router is operating; you do not need to notify
the software or shut down the system power, although you should not run traffic through the module you
are removing while it is being removed. OIR is a method that is seamless to end users on the network,
maintains all routing information, and preserves sessions.
The following is a functional description of OIR for background information only; for specific
procedures for installing and replacing a module in a supported platform, refer to the
Removal and Installation" section on page
Each module has a bus connector that connects it to the router. The connector has a set of tiered pins in
three lengths that send specific signals to the system as they make contact with the module. The system
assesses the signals it receives and the order in which it receives them to determine if a module is being
removed from or introduced to the system. From these signals, the system determines whether to
reinitialize a new interface or to shut down a disconnected interface.
Specifically, when you insert a module, the longest pins make contact with the module first, and the
shortest pins make contact last. The system recognizes the signals and the sequence in which it receives
them.
When you remove or insert a module, the pins send signals to notify the system of changes. The router
then perfoms the following procedure:
1.
2.
3.
PA-A2 ATM CES Port Adapter Installation and Configuration
3-2
Handling a Port Adapter
Metal carrier
Printed circuit board
Rapidly scans the system for configuration changes.
Initializes newly inserted port adapters or administratively shuts down any vacant interfaces.
Brings all previously configured interfaces on the module back to their previously installed state.
Any newly inserted interface is put in the administratively shutdown state, as if it was present (but
not configured) at boot time. If a similar module type is reinserted into a slot, its ports are configured
and brought online up to the port count of the originally installed module of that type.
Chapter 3
Removing and Installing the PA-A2 ATM CES Port Adatper
3-6.
"Port Adapter
OL-346-01
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