The IPs that are in the RFC1918 space are categorized as North-South IPs. The users can specify their North-South IPs while tagging flows and micro-segmentation.
To specify North-South IPs:
On the top-right corner of Home page, click the Profile icon , and then click Settings.
In the Settings section, click North-South IPs.
In the IP Addresses box, enter specific IPs, or IP ranges, or subnets.
Click Save. The IP Addresses Saved confirmation message is displayed upon successful saving.