FIGURE 11 DHCP requests in a network with DHCP Assist operating on a FastIron switch
When the stamped DHCP discovery packet is then received at the router, it is forwarded to the DHCP server. The DHCP server then
extracts the gateway address from each request and assigns an available IP address within the corresponding IP subnet. The IP address
is then forwarded back to the workstation that originated the request.
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.
Conguring IP parameters - Layer 2 switches
FastIron Ethernet Switch Layer 3 Routing
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