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Nortel 2002/2004 phone sets will not work with DHCP

Posted on 2011-02-20
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Last Modified: 2012-05-11
I was hoping someone can help me out as Bell Canada which is listed as an expert in all this has not been able to resolve the problem.

We have nortel iphones that do not work on DHCP at this one site. Here is the switchport config

Switch is a Cisco 3560

switchport trunk encapsulation dot1q
 switchport trunk native vlan 10
 switchport trunk allowed vlan 10,222
 switchport mode trunk
 switchport voice vlan 222
 switchport priority extend cos 1
 spanning-tree portfast

10 is the data vlan and 222 is the voice.

Here is the string for DHCP
Data VLAN
option 128 = Nortel-i2004-A,XXX.XXX.XXX.XXX:4100,1,1;XXX.XXX.XXX.XXX:4100,1,1.
option 191 = VLAN-A:222.

When set to full DHCP the phones just get stuck and sit there responding back that they cannot find the DHCP server.  

I have checked the scope and phone configuration against another location that works but for some reason we cannot get these phone sets to come up with DHCP.  

Can anyone assist as I am all out of ideas
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Question by:SunStreaker
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8 Comments
 
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Expert Comment

by:Rick_at_ptscinti
ID: 34938852
So are they getting a DHCP address and can't connect to the PBX or are they not getting an IP address at all?

If you aren't getting an address:
What is your DHCP server?  Is it on the router or is it an external server?  Is it on the same network range or is it remote?  No you have a helper address assigned if it's a remote DHCP server?  Are you getting an address, but it's in the wrong range?  (that could be a result of the switchport trunk native command)

Rick
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Author Comment

by:SunStreaker
ID: 34939069
I do have a helper address on the router interface. The dhcp server is a windows 2003 box.

The sets do not get an IP at all. Now if I put a computer on port it gets an ip associated with VLAN 10.  The dtrange thing is that this switchport config works at a different site.
I saw mention of putting the option 191 string in quotes but I have not tried that yet.
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Expert Comment

by:Killianisa1
ID: 34941789
have you mirrored the port on the phone and had a look at the packets for the phone? Download a unistim plugin for wireshark? What is phone settings, you can check this by clicking on the globe on the nortel phone. Have you got a phone from the working vlan and swapped out the phone, adding 222 to the vlan on the phone.
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Expert Comment

by:Rick_at_ptscinti
ID: 34942580
So try changing the native vlan to 222 and see if you get an address.  It sounds like the phone is bound to vlan 222 but your swirch port is only broadcasting vlan 10 broadcasts.
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Author Comment

by:SunStreaker
ID: 34942946
Thanks for tips.I will try setting 222 as my native vlan as well as running wireshark. I brought one of the phones with me and will try it at another site that we have where there are no issues.
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Accepted Solution

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SunStreaker earned 0 total points
ID: 35035533
The issue in the end was a problem with the ISL trunking at the site. Once we replaced all our switches with 802.1q capable switches we were fine. Also here is the simplified acces port config

switchport access vlan 7
 switchport voice vlan 22
 spanning-tree portfast
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by:Qlemo
ID: 35321825
This question has been classified as abandoned and is being closed as part of the Cleanup Program. See my comment at the end of the question for more details.
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