Hi
There was some mistakes on your project. Go through the config I did on router and try to make sense of it.
Basially, you need to have suinterface on router. You can´t do it with physical interface because you need put is as trunk and physical interface does not suport trunk
When you create subinterface you can enable trunk.
!
interface GigabitEthernet0/0/0.10
encapsulation dot1Q 10
ip address 10.21.1.50 255.255.255.128
!
interface GigabitEthernet0/0/0.20
encapsulation dot1Q 20
ip address 10.21.1.129 255.255.255.128
!
this configuration must mach with the DHCP scope:
ip dhcp pool mypool
network 10.21.1.0 255.255.255.128
default-router 10.21.1.50
dns-server 11.1.1.10
ip dhcp pool mypool2
network 10.21.1.128 255.255.255.128
default-router 10.21.1.129
dns-server 11.1.1.10
!
The rest is OK. You put switches interfaces right, the communication between router and switch is ok. I tested and all machine got IP as it should.
