Microcode - Cisco 7000 Hardware Installation And Maintenance

Functional Overview
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 ejectors 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 on the new interfaces and
compares them to the existing configuration. If this initial diagnostic fails, the system remains off
line for another 15 seconds while it performs a second set of diagnostics to determine whether or not
the interface processor is faulty and if normal system operation is possible.
If the second diagnostic test passes, which indicates that the system is operating normally and the
new interface processor is faulty, the system resumes normal operation but leaves the new interfaces
disabled.
If the second diagnostic fails, the system crashes, which usually indicates that the new interface
processor has created a problem in the bus and should be removed.
Caution
allowing at least 15 seconds for the system to reinitialize before removing or inserting another
interface processor.
The system brings on line only interfaces that match the current configuration and were previously
configured as up; all others require that you configure them with the configure command. On
interface processors with multiple interfaces, only the interfaces already configured are brought on
line. For example, if you replace an EIP-4 with an EIP-6, only the four previously configured
interfaces (0 through 3) are brought on line; the last two remain in the down state until you configure
them and bring them on line.

Microcode

The Cisco 7000 series routers support downloadable microcode for most upgrades, which enables
you to load new microcode images into Flash memory instead of replacing the microcode ROMs on
the boards. Effective with Software Release 9.17(7), the latest microcode version for each interface
processor type is bundled with the system software image. New microcode images are now
distributed on floppy disk as part of a software maintenance release; microcode upgrades are no
longer distributed individually.
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Rapidly scans the backplane for configuration changes.
Initializes all newly inserted interface processors, noting any removed interfaces and placing
them in the administratively shut down 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.
When removing or replacing interface processors, avoid erroneous failure messages by