This read-write enum sets how this TrBRF acquires its IP configuration: ip-disabled(1) for no IP at all, bootp-when-needed(2) to use BOOTP only if no static address is configured, or bootp-always(3) to always use BOOTP regardless of any static configuration present. An admin managing a TrBRF meant purely for Token Ring bridging with no IP-based management would set ip-disabled(1), while one relying on centralized address assignment would choose bootp-always(3). Setting bootp-when-needed(2) is the pragmatic middle ground that falls back to BOOTP only if the static ciscoTsTrBRFInfoIpAddress hasn't been configured.