Allied Telesis AT-S63 - Manual (Page 401)

AT-S63 Management Software Features Guide
Section VII: Routing 401
Guidelines
These guidelines apply to the BOOTP relay agent:
 A routing interface functions as the BOOTP relay agent for the local
clients in its subnet.
 You can specify up to eight DHCP or BOOTP servers.
 The TTL for BOOTP request relay packets is preset on the AT-9400
Switch to 4. It cannot be changed. Routing interfaces discard BOOTP
requests when the TTL is decremented to zero (i.e., after 4 hops).
 Because both BOOTP and DHCP use BOOTP messages, the BOOTP
relay agents can relay both their packets.