This is a simple DHCP configuration on a Layer 3 Switch:
SW1(config)# ip dhcp excluded-address 10.10.10.1 SW1(config)# ip dhcp pool VLAN20POOL SW1(dhcp-config)# network 10.10.10.0 255.255.255.0 SW1(dhcp-config)# default-router 10.10.10.1 SW1(dhcp-config)# lease 2
Lease is in hours. Default-router IP indicates the default hop for the 10.10.10.0/24 network. The excluded-address will not be available to the DHCP client hosts.
DHCP negotiation utilizes the following DHCP messages:
DISCOVER – Broadcast – Client to Server
OFFER – Unicast – Server to Client
REQUEST – Broadcast – Client to Server
ACK – Unicast – Server to Client