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Setting up a DHCP Relay on a 2920-48G Switch (J9728A)

coasttech
Occasional Contributor

Setting up a DHCP Relay on a 2920-48G Switch (J9728A)

 

We have a new wan installed for are guest wifi network. I run our DHCP Server through Windows Server 2016 and I have added the second scope of IP addresses for the new wan. I have not activated it due to the fact I have 0 clues how to configure the switches for the DHCP Relay!
Here is a look at the vlan configuration - https://goo.gl/R2ruCf

Right now we have 3 vlans


1=Curric 10.128.204.1/32 - 255.255.254.0
2=Guest 10.144.204.2/32 - 255.255.254.0
50=Voice 10.132.76.2 - 255.255.255.0

vlan 50 is for our phones and is run separately from everything so I don't need to worry about that.
vlan 1 is our normal network and is what the Server 2016 DHCP uses.
vlan 2 is the new wan and will only be used for the guest network on the Xirrus AP's. The Xirrus AP's have the ability to pick up on vlan tags so I will be able to make a guest SSID and tell it to use vlan 2

So where I would love some help is how to configure the 2920-48G Switches (J9728A) with the DHCP Relay. We have the main one and 2 other ones in our other building. I have updated these switches in the past to WB.16.03.0003. I have looked through the GUI but it seems I have have to make these setting in the CLI which I do know how to get into but as far configuring the DHCP Relay I am lost.

Please help!

Thanks!

5 REPLIES
Richard Litchfield
Respected Contributor

Re: Setting up a DHCP Relay on a 2920-48G Switch (J9728A)

vlan 133
   name "Aruba Instant 133"
   tagged D15-D16
   ip address 172.20.133.1 255.255.255.0
   ip helper-address 172.20.100.169
   ip helper-address 172.20.100.188
   exit

In this case the .169 address is the Windows DHCP server, and .188 is the ClearPass server (so it can do DHCP fingerprinting).

HP-Browniee
Trusted Contributor

Re: Setting up a DHCP Relay on a 2920-48G Switch (J9728A)

Hello

When you are in the CLI, the only thing you have to do is:

Go to the configuration terminal:

config t

- Go into the vlan you want DHCP in:

vlan 2

- configure a DHCP helper adress:

ip helper-address <Ip adress DHCP server>

And you should be good to go.

Kind regards

coasttech
Occasional Contributor

Re: Setting up a DHCP Relay on a 2920-48G Switch (J9728A)

Thanks for the help! Up and running :)

coasttech
Occasional Contributor

Re: Setting up a DHCP Relay on a 2920-48G Switch (J9728A)

So I have this working but in our second building it does not work. Only thing different is we run fiber to this switch. I just installed a new switch off the main one that works and that one has no issue and the vlan has no issues. 

The fiber switch set to manual ip's for the vlan 2 just do not connect to the dhcp server?

Any ideas why??

 

coasttech
Occasional Contributor

Re: Setting up a DHCP Relay on a 2920-48G Switch (J9728A)

Turns out on that vlan I did not have the fiber port tagged whitch caused the issue.. 

all good!