I am just trying to get me head around where i should place IP helper addresses, here is my setup:
Switch1 has the following two VLANs - VLAN50 DATA, VLAN100 Voice. Interface Gi1/0/1 is a routed port, with address 172.25.200.201/30
default gateway is routed over GI 1/0/1 to the central office.
At the central office, int GI 5/24 is configured with address 172.25.200.202/30 and connects to the other end of the 10mbps EAD circuit.
At the CO, the DHCP server is on vlan40 int GI 3/17
So my question is on which VLAN/Interface do i need to place the helper address? At the moment, i seem to have it on VLAN50, 100, GI 1/0/1 on Switch1 and also GI 5/24 at the CO. All addresses point to the same DHCP Server.
The helper address should be in the SVI for each vlan. So, switch1 has 2 SVIs (one for vlan 50 and one for vlan 100), that is where you add the IP helper address, and as long as you have connectivity to vlan 40, where the DHCP server resides, then you should be fine.
Thanks for your replies, so by the sounds of it i can do away with the helper on GI 1/0/1 on the branch switch and 5/24 at the CO. So it is only needed on the interface closest to the DHCP client. Giuseppe, that makes sense about changing it from a broadcast to a unitcast, hence why the helper is only needed on the interface/vlan closest to the client.
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