Cisco Cisco IOS Software Release 12.4(2)XB6

© 2006 Cisco Systems, Inc. All rights reserved.

These release notes describe new features and significant software components for the Cisco 1800 series 
fixed routers that support the Cisco IOS Cisco IOS Release 12.4(2)XA releases. These release notes are 
updated as needed to describe new memory requirements, new features, new hardware support, software 
platform deferrals, microcode or modem code changes, related document changes, and any other 
important changes. Use these release notes with the 

located on 

 and the Documentation CD.

For a list of the software caveats that apply to Cisco IOS Release 12.4(2)XA, see the 

 and 

. The online caveats document is updated for 

every maintenance release and is located on 

and the Documentation CD.

This section describes the system requirements for Cisco IOS Release 12.4(2)XA and includes the 
following sections: