A leaf interface override policy allows interfaces that have interface policy group assignments to apply an alternate interface policy group.
Imagine that a group of ports have been configured on Node 101, using a specific interface policy group.
One of the interfaces connects to a firewall, and security policies dictate that LLDP and CDP toward the firewall need to be disabled on all firewall-facing interfaces.
It might be impossible to modify the interface policy group associated with the port because it might be part of a port block.
In this case, a leaf interface override can be used to assign an alternative interface policy group to the port of interest.