Cisco Cisco IOS XR Software Release 3.9

These release notes describe the features provided in the Cisco IOS XR Software Release 3.9.2 for the 
Cisco XR 12000 Series Router and are updated as needed.

For information on the Cisco XR 12000 Series Router running Cisco IOS XR Software Release 3.9.2, 
see the 

.

You can find the most current Cisco IOS XR software documentation at

These electronic documents may contain updates and modifications. For more information on obtaining 
Cisco documentation, see the 

“Obtaining Documentation and Submitting a Service Request”

. 

For a list of software caveats that apply to Cisco IOS XR Software Release 3.9.2, see the 

. The caveats are updated for every release and are described at 

We recommend that you view the field notices for this release located at the following URL to see if your 
software or hardware platforms are affected: