This read-only value indicates whether a snooped client's IP address entry was learned dynamically via DHCP or configured statically. Admins use it to tell apart hosts that got their address from the DHCP server from ones with a manually assigned static IP, which affects how the snooping and binding table treats that entry. For example, a laptop that received a lease from the DHCP server would show dynamic(2), while a server with a fixed IP entered into the table would show static(1).