Avaya IP Phones and DHCP mode 1

[paulos2002]

Hi All,I have an 9608G IP Phone and an Avaya IPO 500 on 10.1 with an IP licence, I have programmed the Avaya to be in server mode but have ticked Avaya IP Phones only and I have set the pool in the advanced settings, the phone just sits there rebooting every now and then?

Am I missing something?

 

[Pepp77]

What does the phone say?
Is the phone actually connected to the correct subnet to see this DHCP server?

| ACSS SME |

 

[paulos2002]

Hello, yes as I can statically assign it and it works fine, it says waiting for llp

 

[janni78]

It it says "Waiting for LLDP" it means it gotten some settings but not all required.

If you already have a DHCP server on the network you shouldn't enable it on IP Office, instead configure the existing to include Option 242.
The phone will take it's settings from the dirst DHCP that answer which might not be the IP Office.

"Trying is the first step to failure..." - Homer

 

[paulos2002]

Thanks Janni, it was my understanding that the Avaya in Server mode would only talk to IP phones with the avaya Ip Phones only button checked. IS it bad practice to have it in server mode and have a DHCP server on the network even in this configuration

 

[IPGuru]

Paulos

It s bad practice to have 2 DHCP servers in the same collision domain.

The IP Office port with DHCP should be connected to a switch port that is fixed to the Voice Vlan (The IPO does not perform VLan tagging which is a big shame - come on Avaya).

The handsets now need to know the correct VLan for their DHCP request, there are 3 ways to achieve this.

1) LLDP on the data switches should be configured to specify the correct VLan id*
2) the handset can be physically programmed with the correct VLan ID
3) The customers DHCP server can be configured to change the VLan ID (using option 242) which will cause the Handset to re-request on the correct Vlan.

*This is (IMO) the best solution. Unfortunately is seem that a number of superposed Network engineers are incompetent, On a recent install we were met with "Whats a Vlan" & "We don't know how to configure LLDP)






Do things on the cheap & it will cost you dear

 

[joe2938]

had the same thing happen on my last cut, network person worked on it for 3 hours and the phones still could not get the correct dhcp settings said waiting on lldp, finally I hit the * key and manually entered the correct vlan id and presto dhcp worked great after that. So did this to all phones and after they registered I unplugged a phone and it came back correctly with all of the settings.

 

[DaIPOTek]

@joe FYI you can configure the VLAN in your option 242. Makes it easier than touching each phone individually especially on a big cut.

 

[joe2938]

I wasn't the network person doing this and I told him that but he didn't get it so sometimes you have to do what you have to do

 

[IPGuru]

Indeed
configuring the Data switches and/or the customers DHCP server is a task for their IT team. unfortunately there are a number of IT support companies out there that do not know how to do anything more complicated that install switches/servers in the most basic default configuration.




Do things on the cheap & it will cost you dear