At your central router, Corp, create a pool, specify a DNS server and default gateway that will be provided to clients that are configured using DHCP.
Exclude addresses from the pool before you enable the dhcp pool.
Corp(config)#ip dhcp excluded-address 192.168.10.1
Corp(config)#ip dhcp pool SF_LAN
Corp(dhcp-config)#network 192.168.10.0 255.255.255.0
Corp(dhcp-config)#default-router 192.168.10.1
Corp(dhcp-config)#dns-server 8.8.8.8
Configure the remote router to forward DHCP client requests received on the Fast Ethernet 0/0 interface to an IP address, in our case the Corp router that was just configured above.
LA(config)#int fa0/0
LA(config)#ip helper-address 172.16.10.5