Hi,
I have one switch in a small office which I have defined 2 VLANs. One VLAN (VLAN 10) is for data and another VLAN (VLAN 20) is for voice.
This small office network is connected to the headquarters network.
The small office network has a DHCP server which is on VLAN 10.
There is also a DHCP server in the headquarters network which is intended for backup for the small office.
The voice equipment requires the DHCP server to assign an IP address to them.
In the small office router, do I need to define an "ip helper-address" for the local DHCP server (located on the same switch) because it is on a different VLAN? Does the DHCP broadcast request from voice equipment be able to reach the local DHCP server on the same switch even though they are on different VLANs?
Data VLAN: 172.27.32.0/24
Voice VLAN: 172.27.33.0/24
interface FastEthernet1/1.20
encapsulation dot1Q 200
ip address 172.27.33.1 255.255.255.0 <== Voice VLAN gateway
ip helper-address 172.27.32.16 <== Requred or not????? Data VLAN DHCP server on the same switch
ip helper-address 172.28.22.16 <== DHCP server in headquarters network
Any advice will be appreciated.
