Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 110)

NOTE
When DHCP Assist is enabled on any port, Layer 2 broadcast packets are forwarded by the CPU.
Unknown unicast and multicast packets are still forwarded in hardware, although selective packets
such as IGMP, are sent to the CPU for analysis. When DHCP Assist is not enabled, Layer 2 broadcast
packets are forwarded in hardware.
NOTE
The DHCP relay function of the connecting router must be turned on.
FIGURE 13 DHCP offers are forwarded back toward the requestors
IP Configuration
110 FastIron Ethernet Switch Layer 3 Routing Configuration Guide
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