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ShoreTel DHCP Windows Server with Cisco Switches

Posted on 2014-01-07
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Last Modified: 2014-01-10
Hello All,

I installed a new ShoreTel system and I discovered that the ShoreTel servers do not hand out DHCP. The vendor we are working with gave info on setting up option 156 in the Windows DHCP scope. Right now, we are replacing the Cisco system and they were on a 10.10.1.x subnet and scope for the phones. Our switches and routers are all Cisco devices and have VLAN999 assigned for the phones and VLAN1 for data traffic.

We are running out of IP addresses for the internal DHCP scope so I will need to change that at some point; however, wondering if anyone can help me out? I have a dedicated DHCP server and while I did have two servers (one with about 70 percent of the addresses and then the second as a failover), I went to one because with the phone system, I don't want to make it very hard to manage, etc...

Read so much about option 156 and Cisco switches but somehow, it just isn't working. It would be nice to have the Cisco router hand out the IP's but when we had that setup, the phones get an internal IP address of 192.168.1.x, see the Option 156 and then when they are supposed to then get the 10.10.1.x address, they don't. They stay at the "Getting DHCP" screen. I then setup a Windows DHCP server with a second network card that had the IP of 10.10.1.9 on it and then the DHCP range was 10.10.1.50-200. The phones did the same thing! AHHHH!!!!

Killing me. thoughts?
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Question by:ryanbarnes86
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by:getzjd
ID: 39764950
We had to setup DHCP on our Adtran switches with ShoreTel.  When we installed our system in 2009, the phones would not see the option 156 coming from our Windows DHCP server. ShoreTel at the time said that it seemed to happen with some Broadcom NIC cards.  

On the Cisco, you will need something similar.  Keep in mind, this is an Adtran config v 10.03 firmware.  Most of your commands in Cisco IOS are identical.

ip dhcp pool "DATA"
  network 10.xx.xx.xx 255.255.248.0
  domain-name "xxxxxxxxxxxxxxx""
  dns-server 10.xx.x.xx 10.xx.x.xx 10.xxx.x.x
  netbios-node-type h-node
  default-router 10.xx.xx.xx
  lease 5
  ntp-server 10.xxx.x.x
  option 156 ascii "ftpservers=10.xxx.x.xx, country=1, language=1, layer2tagging=1, vlanid=35"
 !
ip dhcp pool "VOICE"
  network 192.168.xx.x 255.255.255.0
  dns-server 10.xx.xx.xx 10.xx.xx.xx 10.xx.xx.xx
  netbios-node-type h-node
  default-router 192.168.xx.xx
  lease 7
  ntp-server 10.xxx.x.x
  option 156 ascii "ftpservers=10.xxx.xx.xxx, country=1, language=1, layer2taggingg=1, vlanid=35"
!

After this make sure your switch ports are set to trunk and that your vlans are properly setup on the Cisco switch and that routing between vlans is in place.
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Author Comment

by:ryanbarnes86
ID: 39765414
Getzjd - Thanks for the info. Can you please help me out on the DATA VLAN pool? Forgive me for the stupid question. Do I need to have a Windows server with a 10.10.1.x IP/subnet and Windows handing out the IP, too? Or should I just go with the router one like you listed above and have the Option 156 in the Windows DHCP scope?
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Accepted Solution

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getzjd earned 500 total points
ID: 39767045
Do you want to run your DHCP server on a Windows server or on your router/switch?  We chose to run ours on our Adtran Layer 3 switches at each of our locations.   You only want one DHCP server per site though.   Regardless of where you put your DHCP server, you still need to configure your VLANs on your switch and ensure routing is in place.

Your native data vlan will be vlan 1 and you can make vlan 999 your voice vlan.

If you put your DHCP service on your Cisco router, It may look something like the below.  I noticed you said you were running out of IP addresses.  I changed the subnet to 10.10.0.0 255.255.252.0.  This will give you the range of 10.10.0.1 through 10.10.3.254 and I excluded 10.10.0.1 through 10.10.1.50.  

ip dhcp excluded-address 10.10.0.1 10.10.1.50

ip dhcp pool "DATA"
  network 10.10.0.0 255.255.252.0
  domain-name "<Insert your domain name>"
  dns-server 10.10.x.xx 10.10.x.xx      <INSERT YOUR DNS SERVERS>
  netbios-node-type h-node
  default-router 10.10.xx.xx  <INSERT YOUR GATEWAY ADDRESS>
  lease 5
  ntp-server 10.10.x.x  <INSERT YOUR TIME SERVER>
  option 156 ascii "ftpservers=10.10.x.xx, country=1, language=1, layer2tagging=1, vlanid=999"   <INSERT YOUR SHORETEL SERVER IP>
 !
ip dhcp pool "VOICE"
  network 192.168.1.0 255.255.255.0
  dns-server 10.10.xx.xx 10.10.xx.xx    <INSERT YOUR DNS>
  netbios-node-type h-node
  default-router 192.168.1.xx  <INSERT YOUR VLAN 999 INTERFACE GATEWAY>
  lease 7
  ntp-server 10.10.x.x  <INSERT YOUR TIME SERVER>
  option 156 ascii "ftpservers=10.10.xx.xxx, country=1, language=1, layer2taggingg=1, vlanid=999"  <INSERT YOUR SHORETEL SERVER>
!

Keep in mind that your shoretel switches will be assigned a static IP on 192.168.1.x.  on this port, you will need to set the native vlan to 999
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Author Closing Comment

by:ryanbarnes86
ID: 39771507
THANKS! Will keep you updated
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