This read-write boolean always reads back as false, but setting it to true deletes all rows in docsSubMgtCpeIpTable that were learned (rather than provisioned) for that cable modem. Operators use this to clear out a stale list of dynamically discovered CPE addresses without disturbing entries that came from DOCSIS provisioning. For example, after swapping out a customer's home router, an operator might set this to true to flush the old learned IP addresses so the CMTS can relearn the new device's address.