How often is new device support released?
DFM Incremental Device Support (IDU) packages are normally released every three months. These packages provide support for new devices, in between major DFM releases. (These packages normally also contain bug fixes.) You can download an IDU by logging into Cisco.com and pointing your browser to: http://www.cisco.com/pcgi-bin/tablebuild.pl/cw2000-dfm.
