Mitel phones 5320e DHCP Issue

[cgashlin01]

So does anyone have experience using Server DHCP?

[Tech Electronics]

cgashlin01,

We all do since the built-in DHCP server only came out at 6.0.

So, if you want to use your DHCP Server there are a few things that mess up in the process.

1. DHCP Server cannot read tagged VLAN traffic properly and won't respond correctly. Solution: put a second NIC in the server and put it on a port that is untagged for the voice VLAN.
2. Don't have LLDP or CDP running and all DHCP traffic stays on the Data Network; the DHCP server responds but issues a data VLAN address and you get the 129 error since it doesn't have option 43 or 125.
3. You get the DHCP from the Voice VLAN but you still get an error as Option 125 was setup improperly or the DHCP server can't support encapsulated options. Solution use option 43 instead.

Have you used the attached .zip file that Sarond posted to setup option 125? I know you can't load it on a newer server and get it to work, but you can load it on your PC and run it just to get the correct configuration option and manually do the rest by following the document.

Thanks,

TE

[cgashlin01]

I am scheduled on the 20th to do the cutover at work with the VLAN I will have to test it at that point. I do have a 2nd NIC I can utilize in my ESXi box that is holding my servers.

[Tech Electronics]

cgashlin01,

That should solve your problem with the DHCP server seeing the VLAN traffic properly, but you still have to decide on whether you want to use option 43 or 125 and then set them up properly.

What is your reason for wanting to use an external DHCP server in the first place?

Thanks,

TE

[johnp]

If the DCHP server is only on the data vlan and has both scopes setup properly with the Mitel option and the voice vlan has an ip helper address that points to this server and routing works properly, then it should work IMHO.

Much easier to have the phone system handle DHCP for the phones natively and just have the options setup properly in the other DHCP server.