Cisco Cisco IOS Software Release 12.0 S

Platform: Cisco 12000 series

Field diagnostics are available for the Cisco 12000 series Internet router to help you isolate faulty 
hardware to the level of a field-replaceable unit (FRU) without disrupting the operation of the system. 
After you identify the faulty unit, you can replace it with a spare unit.

Field diagnostics are not designed to identify specific components within the router. They simply 
determine whether a particular card is operational or defective.

Starting with Cisco IOS Release 12.0(22)S, Cisco Systems has unbundled the Cisco 12000 series field 
diagnostics line card software image from the Cisco IOS software image. In earlier Cisco IOS releases, 
diagnostics could be launched from the command line and the imbedded image would be launched. In 
order to accommodate customers with 20-MB Flash memory cards, field diagnostics are now stored and 
maintained as a separate image that must be available on a Flash memory card or a TFTP boot server 
before the field diagnostics commands can be used.

Before you can use the line card field diagnostics commands, you must install a valid field diagnostics 
software image in the Cisco 12000 series Internet router that is to be tested or on a TFTP boot server. 
The size of a field diagnostics software image is about 18 MB, and a Cisco IOS software image for the 
Cisco 12000 series Internet router is slightly larger. A single 64-MB Flash memory card can contain both 
images. Alternately, these images can be stored individually on 20-MB Flash memory cards in PCMCIA 
slots 0 and 1. To accommodate future Cisco IOS releases, we recommend that you use Flash memory 
cards that are larger than 20 MB.

Field diagnostics software images are compatible backwards and forwards with all releases of Cisco IOS 
Release 12.0S from Cisco IOS Release 12.0(22)S on. Cisco strongly recommends that you always 
download the latest available field diagnostics software image from 

. The field diagnostics 

software image is named “c12k-fdiagsbflc-mz.versionnumber.”

To perform field diagnostics on a line card, Route Processor card (RP), including both the Performance 
Route Processor (PRP) and Gigabit Route Processor (GRP), Switch Fabric Card (SFC), or Clock 
Scheduler Card (CSC) in Cisco 12000 series Internet routers, use the diag command in privileged EXEC 
configuration mode. To halt a running field diagnostic session on a line card or RP, use the diag halt 
form of this command.

For more information about Cisco 12000 Series Field Diagnostics, see the document at the following 
location:

 

Platform: Cisco 12000 series

The Cisco SONET Linear Automatic Protection Switching (APS) MIB module supports the 
configuration and management of SONET linear APS groups. The definitions and descriptions that are 
used in this MIB are derived from SONET Transport Systems: Common Generic Criteria, 
GR-253-CORE Revision 2, section 5.3. The MIB is also consistent with the Multiplex Section Protection