Hi guy,

i have a simple topology like following

Router A directly connected to Switch L3 in vlan 10, and i have 2 end user that one connected to vlan 10 and the others to vlan 20. in this case router 3 only work as end user and DHCP server, and all routing task running by the Switch L3. there is no trunk link between Router A and Switch L3

and i wondering could the end user that connected to vlan 20 retrieve the IP address from the router A (DHCP Server)??, because on my lab that is not possible, i always get failed,

note : i dont want to make any subinterface on the Router A

is that possible??

If routing is enabled on the L3 switch you can put a ip helper address pointing to the router on svi vlan20?

beside adding IP helper address on the Switch L3 i need to add the add route command to the router to network of vlan 20, i forget if the router doesnt have default gateway

thanks guys now problem solved