The DHCP lease split function enables the use of shorter lease times toward the DHCP client than the lease time committed by the DHCP server. The DHCP relay lease split function can be used for:
liveness detection of DHCP clients, so that addresses or prefixes of inactive clients can be reclaimed sooner without generating a high volume of control traffic toward the DHCP server
BNG reachability verification by DHCP clients without the need for an additional protocol