Network/DHCP Question with 3300 CXII

[Cabarrus]

Two sites:

Site A will be the primary site and have a new Mitel 3300 CXII Controller with a PRI. We will have a HP Procurve 2610 POE switch with VLAN 1 for Data and VLAN 2 for Voice and the 3300 will be used as DHCP Server for the phones in the voice VLAN 2.

Site B is connected to Site A via a point2point T1 and will have a HP Procurve 2610 POE Switch , with VLAN 1 for Data and VLAN 2 for voice.

My question is how can the phones in VLAN 2 at Site B get DHCP addresses from the 3300 in Site A? It looks like you could create a second DHCP scope on the 3300, but i dont know how to get the phones from Site B to use the IP's from that second scope. The only method i can think of is to assign reserve ips (statics) in the DHCP of the 3300.

I would use the iphelper command in the procurve switch for vlan 2 at site b to let that vlan know about the mitel 3300 dhcp server.

Any help would be great.

thanks

 

[Mitel100]

You are on the right track. Use your iphelper address to point to the 3300 doing the DHCP.

On the 3300 you will have two scopes one for site A and one for site B.

The DHCP server will assign the correct address based on the network it came from (Vlan 2).

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[Cabarrus]

thanks for the quick response.. I failed to mention the VLAN 2 at each site was going to be setup using different subnets, which i assume will not work with your suggestion. I am wondering if this is needed? ( i am not a network expert ) Let me know your thoughts

Site w/ 3300 (Site A)
VLAN 1(Data) – 10.16.100.0 255.255.255.0 10.16.100.254
VLAN 2(Voice) – 10.16.102.0 255.255.255.0 10.16.102.254

Site 2 (Site B)
VLAN1(Data) – 10.16.1.0 255.255.255.0 10.16.1.254
VLAN2(Voice) – 10.16.2.0 255.255.255.0 10.16.2.254

 

[Mitel100]

Thats fine, on your 3300 DHCP server, you would program the relevant subnets and the IP addresses it will allocate to those subnets.

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[Cabarrus]

Would the specific reason be below? Im trying to learn how this is done, i assume there is some intelligence between the iphelper and the specific dhcp scope on the mitel to ensure these two align-up.. i.e. subnet in distance site matches correct dhcp scope on mitel

Giaddr. A giaddr, which indicates a client's subnetwork, can be presented to the DHCP local server in the client's DHCPREQUEST message. The giaddr field in the DHCP request message usually contains the IP address of a DHCP relay server. The router attempts to match the giaddr address in the DHCP request message with the network address of a DHCP local pool. If it finds a match, the router uses the matching DHCP local pool.

 

[Mitel100]

That is correct, The relay agent in this case is your HP switch.

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[Cabarrus]

I have this environment up, and I can get the phone at one site to connect to the 3300 at the other site and when the phone boots it says using option 125 then resets the phone. Phones on vlan 2 that are local to the site work fine.

Any suggestions/ideas?

thanks

 

[stickymicky27]

Can I ask what the full ascii is of your 125 option?...

 

[Cabarrus]

Sure, its:

id:ipphone.mitel.com;sw_tftp=10.16.2.102;call_srv=10.16.2.102;vlan=2;l2p=6;dscp=46v46s26

I even tried not using option 125 but rather 128,129,130 etc..

same problem

 

[stickymicky27]

what is the physical IP of the 3300 on the 10.16.102.x range?

 

[stickymicky27]

And can you ping it from the SITE B VLAN2 IP range...

 

[stickymicky27]

Also post the option 125 from the 10.16.102.x range?

 

[Mitel100]

Have you got an IP Helper address configured on both Vlan 1 and 2 of your switch?

__________________________

There is no 'I' in 'Team'
__________________________

 

[Cabarrus]

the physical ip of 3300 is 10.16.102.12

if i set a static ip on phone from site b vlan2 ip range i can connect to 3300 fine, but with dhcp it connects then resets phone and loops

i have ip helper address of the 3300 in site b vlan2, not vlan1 at site b since they have a dhcp windows server in vlan1 (data)

thanks

 

[stickymicky27]

While im thinking... can I ask why you just didn't use the windows server to control the IP address scopes and just use 1 DHCP server?

 

[stickymicky27]

Are you using the ports on the switch as dedicated ports... ie. port 1 is VLAN1, port 2 is VLAN2 and so on...

 

[stickymicky27]

Also what static IP did you set on the handset?

 

[Cabarrus]

I have VLAN1 as untagged and VLAN2 as tagged on the ports. I set the phone w/ a static in the 10.16.2.X range, like 10.16.2.75

 

[stickymicky27]

Sorry for the dumbness but i have only used cisco switches... and with those you configure them all as a vlan 1 (data) then you configure a vlan for voice say 6?... and you use that on all ports... so the all devices boot on vlan1 but then within your DHCP scope for vlan the option 125 will tell then to reboot on vlan 6 then the VLAN 6 IP helper option will direct the phones to that DHCP server and the phones just work...

I also find that the DHCP stuff in the 3300 isnt that great... and beacuse of that I have always used the windows DHCP server.

 

[Cabarrus]

I think i might of got it, but will know later today. I didnt setup two option 3s , one for each subnet on the 3300. I used one global ...

ill be by the site today and test it and followup..

thanks