IPO for DHCP and multiple VLANs

[IPOtech111]

I have an IPO SE R9.1 going in. Physical primary server at the main location with a ip500 expansion. Physical secondary server at a second location also with a ip500 expansion. And then 5 other locations all with ip500 expansions. All up phones to register to the primary server. Customer wants to use the IPO for DHCP. Each location has their own VLAN. Is it possible to configure the IPO for DHCP for multiple different VLANs?

 

[amriddle01]

No

 

[IPOtech111]

Thats what I thought. Thanks.

 

[derfloh]

Sure Andy? I never tested it but if you configure DHCP ranges for each VLAN along with a DHCP Relay pointing at the IPO to get an address it should work.

 

[amriddle01]

The IPO will only hand out addresses from a single range, it can't differentiate between VLAN's to know what pool to choose from even if it could

 

[amriddle01]

Well 2 if you use LAN2 I suppose, but that's not really a solution either

 

[fieldtechonIR]

Curious how the remote sites are connecting back to the primary? VPN? MPLS?

 

[amriddle01]

They would all need to be local for a single DHCP server obviously, so good point also

 

[IPOtech111]

The sites are connected via MPLS.

I started by doing doing what derfloh said and had created each VLAN range in the DHCP pools then realized exactly what you said Andy, no way to differentiate the VLANs on the IPO. Thats when I came here to see if anyone has done it before. I noticed the option to create a sub interface on the NIC of the primary server but I dont really know anything about the sub interfaces or what they would be used for or if they could come into play at all here.

 

[derfloh]

The IPO will only hand out addresses from a single range, it can't differentiate between VLAN's to know what pool to choose from even if it could

But why can you configure multiple ranges? A DHCP server usually decides what IP range to use based on the IP address of the relay service. Did it with Windows DHCP service and a 4800 series AVAYA switch that relays DHCP requests.

 

[amriddle01]

Because dedicated DHCP servers support that, the IP Office doesn't

 

[amriddle01]

If the different address ranges are MPLS sites, then they are just plain different LANs not VLANS though?

 

[fieldtechonIR]

VLANs are carried across MPLS. The IPO could be your DHCP server. Depending on the switches I would use Telephony OUI and have the switch assign the VLAN to the phone then it should find the IPO port on the same VLAN handing out DHCP. The switch port the IPO is connected to needs to be assigned to the VLAN in question. I think that will work for you.

 

[derfloh]

@Andy
I am not at work next week. But if I am back I will give it a try.