Setup DHCP Helper On HP E-Series Procurve
If you have created VLAN`s on you HP e-series switch/router then you may want DHCP from your DHCP server to be able to service devices that are connected to your VLAN`s, by default the DHCP broadcast will not pass through the router/switch without a helper address setup on the VLANs.
First check you have setup your vlans correctly on your access layer.
On the distribution layer ( your core switch / router ) you will also need to setup the vlans to match your access layer, however on each vlan you will need to setup the ip-helper address. This means that when a device sends out a DHCP request it does so on 255.255.255.255, as the e series is a layer 3 switch/router we can set it up as a DHCP relay.To do so do the following. ( in my example my core is called “router” ).
Go to the vlan you want to setup the ip helper address on.
Router (vlan10)#
Now enter the ip address and subnet of the DHCP server.
ip helper-address 10.5.5.1/24
Finally we need to enable IP Routing for this to work. Use the command below.
ip routing
Now when a device on VLAN 10 sends a DHCP request out, the router will forward the request to 10.5.5.1 ( the DHCP server). If you have multiple scopes then the DCHP server will issue an address based on the IP address of the VLAN that the device that has sent the DHCP request.
Remember if you struggle with the syntax of any command, partially type the command then press tab, see see all extension add a ? to the end of the coomand
Tags: e series
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Ruben
| #
HI!
I’ve working with a hp but from curve 2626 series…Do you think this step is also necessary in my hp procurve switch? My device is not getting the IP from the dhcp client (if I set up the ip manually i cannot ping the vlan interface in router neither)
Thanks!
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Allen White
| #
Hi Ruben,
If you want DHCP from your server to be able to relay DHCP through the switch to the vlan your device is on then absolutely this step is required. Is routing also enabled the vlans?
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