CSM (Cisco Software Manager) Aka SMU manager is a java based application which helps user for software management on ASR9000/NCS6k and CRS routers.
This application remains in sync over public infrastructure with cisco.com for up to date information. No user interference required for CSM sync with cisco.com software manager database.
With the help of CSM application, user gets SMU (Software Maintenance Unit) and SP (Service pack) recommendations on specific release with almost negligible efforts and avoid manual efforts for SMU/SP recommendations on a specific release.
User can use CSM for SMU or SP installation on standalone or multiple routers at the same time.
For more details about CSM with user guide, please refer below link.
SMU (Software Maintenance Unit) is bug fix (DDTS fix) or software patch in for of "PIE" (Package Installation Envelope) which is provided on per release and per component basis to specific platform.
Since IOS XR base code is common for ASR9000, NCS6000 and CRS but SMU for either of these platforms are not applicable to other platform boxes.
Note: - SMU are not applicable for feature requests. Engineering team does not provide any new feature on any specific release through SMU. Such feature requests are entertain through Feature packs and this forum is not covering Feature pack details.