How to make Multiple VLAN’s, Single DHCP Server, Multiple DHCP Scopes 1x Cisco 1841 Router?

1- you have to create dot1Q interface with subinterfaces connected to the local switches (that configured with the required VLANS)

2- create DHCP Pool for each vlan with:

IP Dhcp pool XXX(Vlan No as example)

network x.x.x.x y.y.y.y

dns server w.x.y.z

default w.x.y.z

3- exclude the unwanted dynamic dhcp ips (ip dhcp exclude x1.x1.x1.x1 x2.x2.x2.x2)

4- configure the subinterfaces as a gateway 

you can create as many scopes in router u want

!

ip dhcp pool Data

network.0.0.0/

defaul-router.0.0.1

dns-server1.1.1.1

!

similarly others