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Online Insertion and Removal
Figure 3-1
Online Insertion and Removal
Several platforms support online insertion and removal (OIR) of port adapters; therefore, you do not
have to power down routers when removing and replacing a PA-4B-U in the Cisco 7100 series routers,
Cisco 7200 series routers, Cisco 7200 VXR routers, or Cisco 7301 router.
It is wise to gracefully shut down the system before removing a port adapter that has active traffic moving
through it. Removing a port adapter while traffic is flowing through the ports can cause system
disruption. Once the port adapter is inserted, the ports can be brought back up.
Note
As you disengage the port adapter from the router or switch, OIR administratively shuts down all active
interfaces in the port adapter.
OIR allows you to install and replace port adapters 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 port
adapter 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 port adapter in a supported platform, refer to the
Removal and Installation" section on page
Each port adapter 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 port adapter. The
system assesses the signals it receives and the order in which it receives them to determine if a port
adapter 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 port adapter, the longest pins make contact with the port adapter 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 port adapter, the pins send signals to notify the system of changes. The
router then performs the following procedure:
1.
2.
PA-4B-U Basic Rate Interface Port Adapter Installation and Configuration
3-2
Handling a Port Adapter
Printed circuit board
Metal carrier
Rapidly scans the system for configuration changes.
Initializes newly inserted port adapters or administratively shuts down any vacant interfaces.
Chapter 3
3-3.
Removing and Installing Port Adapters
"Port Adapter
OL-3521-02
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