Nortel I2004 with on Cisco 3560 Switch

[tex52]

I have Nortel I2004 VoIP phones that I connected to a Cisco 3560 switch. I am running the voice on VLAN 200, in the phone config I have VLAN configuration set to Manual and to use VLAN 200. However the phone is also communicating on VLAN 10 which is my data network, I know this because it is recieving an IP address from my data network DHCP server which is on a seperate subnet. Any help is greatly appreciated! I have placed my switchport config below.

interface FastEthernet0/1
switchport trunk encapsulation dot1q
switchport trunk native vlan 10
switchport mode trunk
no ip address
mls qos trust cos
no mdix auto
spanning-tree portfast

 

[johnpoole]

DHCP server which is on a seperate subnet, the dhcp request is a broadcast, the connection between the two sub nets? are they routed, i don't see what i would expect on eth 0/1, is that your switch interface? if so i would expect a vlan 400 statement, does show ip route show static routes between the two vlans?

john poole
bellsouth business
columbia,sc

 

[tex52]

Thanks for the response. I have a DHCP server on VLAN 200 as well as 10. I want my phones to get an ip from vlan 200 not 10. I have IP Routing setup on my switches to allow intervlan routing. eth 0/1 is how all my switchports are configured. I do not have a vlan 400. My main problem is that i have my phones set to talk on vlan 200 only and they are recieving an ip from the dhcp server on vlan 10. Hope this is not too confusing. Everything works fine when i turn off the dhcp server on vlan 10...the phones then recieve the address from the server on vlan 200.

 

[johnpoole]

you can't confuse me, i'm not a network geek, i was born confused. i would set up a dhcp relay server on the same broadcast as the sets, pointed to the correct dhcp server. the phone sends out a broadcast, the 1st dhcp server that hears that broadcast responds. i would put a router between the 3650 and the dhcp server and use it as a dhcp server for the sets..

john poole
bellsouth business
columbia,sc

 

[tex52]

Does the VLAN settiing on the i2004 just not function correctly or what? The VLANS seperate broadcast domains even with ip routing setup, so the phone is obviously not just comminicating on vlan 200. You have a good suggestion but the sets are sending the broadcast out on both vlans anyway...so my vlan 10 dhcp server is always answering first.

 

[johnpoole]

the only way i see that is physical location, and i have to believe that he is routing between vlans for another reason. i have only used vlans to break broadcast domains, but i'm lite on the data side. having both vlans on the same broadcast is causing his problems, so i assume the setup is needed for other apps.. without a compete network picture, i can't guess past that

john poole
bellsouth business
columbia,sc

 

[tex52]

With intervlan routing/IP routing your vlans are still broken up in seperate broadcast domains, you just have routes from one vlan to the other, no broadcast traffic is crossed from one vlan to the next though. THe whole issue once again seems to be that the phone is not doing what it should and that is communicating on the VLAN that is specified in the phone setup.

 

[johnpoole]

try again, the phone is broadcasting for an ip address, if that broadcast was not crossing the vlan barrier, the wronge dhcp server would not hear it. i would put a data sniffer on vlan 10, plug in a new phone and trace the route from the dhcp request to the phone. the phone does a broadcast,in as much as it has no info on the dhcp location, if it is getting a reply from the wronge vlan, then that vlan is responding to a broadcast that you are saying it didn't get.

john poole
bellsouth business
columbia,sc

 

[tex52]

Well I agree with that, makes sense. Now that I think about it the reason it is broadcasting to vlan 10 is due to the fact that I have that set as my native vlan on the port; I have to do that because I am using the built in switch on the phone for my computers to plug into which have to talk on vlan 10. Still though in the phone setup I specify to use vlan 200 only, am I missing something here, if i specify in the phone to use vlan 200 shoud it not only communicate on vlan 200?

 

[johnpoole]

because of the broadcast nature, the phone does not know where a dhcp is, that is not a directed broadcast. find a way to tell your vlan 10 server to ignore request from the vlan it shouldn't see anyway... (i would look for a static route that you don't need) as with your config, at a layer 3 level, ping 255.255.255.255, you'll get replies from both vlans..

john poole
bellsouth business
columbia,sc

 

[mdwsgl]

What did you setup in your DHCP scope? You'll need a new scope option on your (domain) DHCP server to point to your Nortel gateway server from which the phone will get it's IP assignment.
The scope should look like this:
Nortel-i2004-A,192.168.153.90:4100,1,10.

 

[tex52]

Which option on my data (vlan 10) dhcp server needs to be set?

I do not have anything other than standard settings on my data dhcp server. I am not sure what you mean by what the above scope should look like.

 

[mdwsgl]

You need to add a custom scope option on your DHCP server that services DHCP requests and essentially points to your i2004 sets to the PBX/Call Server that assigns the IP. Add the above option and assign it to your DHCP scope that vlan 10 is pulling it's DHCP options from.

Scope Option:
NORTEL-I2004-A
String:
Nortel-i2004-A,192.168.153.90:4100,1,10.
(where the IP address points to your PBX/CS DHCP gateway)

Check the NTP 553-3001-160_1.00 Data Networking for Voice over IP pp 330-333
Good luck!

 

[tex52]

Does it matter if my DHCP server is not on the PBX/CS? I am not a Nortel guy at all by the way. The IP address should be the DHCP server or the Node IP...I am assuming the DHCP server right?

 

[mdwsgl]

Well... actually it should be the node IP on your PBX that services your TLAN (voice LAN). You will need to find that address out. Your PBX/CS will need to register the i2004 and assign it an appropriate TN/DN/IP addressing. Your custom scope will go on your standard DHCP server that assigns your vlan nodes their IP addressing will forward the request between your customer and voice vlans (10/200), which normally are completely seperate.
Hope this helps, and I'm not a PBX engineer either- I just play one on TV...

 

[mdwsgl]

You can find out the node IP address by looking at the OTM/MDR server under IP Telephony, and look at the local Node under your site name. Are you familiar with either of those platforms? The Node IP address displayed is the one you are after. In the container below the Node information you will see all the media cards and their parameters and addresses both in your PBX and voice LANs.

 

[I2007]

Do you use the same DHCP server on both VLAN's?

i2007

 

[tex52]

I have tried using the same with dual nics...one in vlan 200 and one in vlan 10. And I have tried a different DHCP server in vlan 200. THe phones always grab an address from vlan 10 first when it is available.

 

[johnpoole]

try this post in a network forum, most of us have gave it our best shot. what little i know is that the phones can't get an ip from a broadcast domain that it can't reach,,

john poole
bellsouth business
columbia,sc

 

[tex52]

Well the phone can reach the broadcast domain because I can turn off the dhcp server in vlan10 and they recieve an IP from the dhcp server in vlan200, just how i want them to. I have an Alltel engineer that is going to work with me on it next week. Thanks.