How to configure DHCP Relay on a HP A5120 switch.
To do this you need to go in the system-view of the switch. As followed you need to configured the DHCP Option in the switch. You can do this by:
# dhcp enable #
Now you need to configure a Server-group where you configure the DHCP server where the clients can find their addresses.
# dhcp relay server-group 0 ip <server ip address> #
Configure some vlans if you don’t have some.
# vlan 1 igmp-snooping enable # vlan 2 name Wi-Fi # vlan 3 name Management # interface Vlan-interface1 ip address xxx.xxx.xx1.249 255.255.255.0 # interface Vlan-interface2 ip address xxx.xxx.xx2.249 255.255.255.0
You need to specify the following commands to enable the dhcp relay on the vlan interface.
dhcp select relay dhcp relay server-select 0
After this you can configure your DHCP server with the correct addresses for the created vlan. Which should archive an IP address from the server.
Let say i have 2 DHCP servers which i will used for 2 subnets in the same vlan
dhcp relay server-group 3 ip a.a.a.a
dhcp relay server-group 4 ip b.b.b.b
My current config for the existing subnet as below:-
interface Vlan-interface101
description OFFICE
ip address x.x.x.1 255.255.255.0
ospf cost 10
dhcp select relay
dhcp relay server-select 4
igmp enable
igmp version 3
pim sm
so my plan is to add new subnet y.y.y.0/24 in the same vlan 101 but it will lease ip from server group 3.
Is this possible? and do you have any idea how my config should looks like.
For as I know this isn’t possible you should create a new vlan. You can only have 1 DHCP server on a subnet.
if you are creating a new domain in the same subnet you can install this but you have to transfer the DHCP role to a new server in the new domain. I hope this helps.