Cisco Headend System Release 2.5 Technical References

78-4020566-01 Rev B 

 

5 

 

To optimize the staging time for new SSC host DHCTs, Cisco recommends the 

following network changes. These changes provide your staging area with improved 

efficiency in the staging process: 

 

 

Cisco has created patches to address customer concerns about staging time for 

the SSC DHCTs. The patches deliver the CVT message to the out-of-band 

carousel once every 30 seconds. This results in the overall staging time being 

reduced by an average 4-5 minutes per DHCT. To take advantage of this 

enhancement, your DNCS needs to be upgraded to one of the following releases: 

SR 2.5/3.5/4.0 Service Pack 3 (Emergency Patch 3) 

SR 2.7/3.7/4.2 Service Pack 0.2 (Emergency Patch 1) 

Note: A patch for SR 2.2/3.2 Service Pack 5 was not developed for this 

enhancement. 

 

Changing the data carousel rate to 3 Mbps improves the update time of the BFS 

carousel and reduces the time it takes for the software download to complete.  
Note: The ability to change the data carousel rate to 3 Mbps is dependent on 

available bandwidth in the network. 

 

Using the listCVT utility identifies unused files on the image list that can then be 

deleted. Removing these unnecessary files from your BFS carousel optimizes the 

bootloader carousels to include only the necessary CVT files. The following 

procedure provides instructions to run the utility and remove the files.