The only cisco one rogers currently has, the DPC3825.
Netflix itself, has 3 settings. Low, med, high.
You usually set this, in the ACCOUNT SETTINGS for netflix itself, via the webpage.
This will force the quality down.. but then also the file/stream size.
When you have it set to the highest.. and you have a compatable device.. it will AUTO switch to super HD (usually takes a few seconds.. you will see the quality improve as you watch the first few seconds of the video).
https://support.netflix.com/en/node/8731
Thats a rough list of what devices support super HD