DHCP question

[DigitelD]

I am not sure if this is the right forum or not for this question. The customer has a Nortel BCM phone system and you can set up the BCM as a DHCP server or you can set it up for "IP phones only" and it uses port 7000 for the IP phones. My question is not about the BCM but the customers DHCP server. I don't have the details of their equipment as I am out of town. When the customer plugged in their PC's the IT tech said they were getting IP addresses from the BCM. Since the BCM will only hand out IP addresses on port 7000, how would the IT tech keep the PC's from retreiving addresses from port 7000? This is for my understanding for the future. If someone could explain this to me I would appreciate it.

SHK Certified (School of Hard Knocks)

 

[burtsbees]

Are you saying they don't want the BCM acting as a dhcp server, but rather they want their own dhcp server handing out addresses?

Burt

 

[mattKnight]

As I understand it

BCM handles IP addresses for IP phones

Other server handles IP addresses for Data stuff

At a guess, the voice stuff (hence BCM) should be on a different VLAN to the data network. If that is the way it was set up, I'd look at the inter-vlan routing, the dataswitch config (i.e. has it lost the VLAN config) or possible has some repatched the BCM into the wrong place?

What happens if you reset an IP phone? does it get a valid IPO address on the voice network or just hang?


If, you only have the 1 VLAN - I can't see how it would work ...

Take Care

Matt
If at first you don't succeed, skydiving is not for you.

 

[burtsbees]

They would have to be on the same VLAN for them both to be able to hand out IP addresses, normally. If they are in different broadcast domains (I.E. different subnets or VLANs), then a helper-address command is necessary on the router to pass the broadcast from one broadcast domain to another.

Burt

 

[DigitelD]

They are not on different VLANs. They don't want the BCM to handout IP addresses for the PC's that is why I set it up as IP Phones only. I just don't understand why the PC's were getting IP addresses from the BCM. The port that the BCM and the IP phones use is port 7000.

SHK Certified (School of Hard Knocks)