4 IP500v2 in SCN with DHCP

[rgunther]

Hello, I have another system i am currently installing that involves 4 IP500v2 R8.1(69) in an SCN. For the 4 IPO's I am using the following IP's

Site A - 192.168.42.1 / DHCP Range 192.168.42.5 & Up
Site B - 192.168.43.1 / DHCP Range 192.168.43.5 & Up
Site C - 192.168.44.1 / DHCP Range 192.168.44.5 & Up
Site D - 192.168.45.1 / DHCP Range 192.168.45.5 & Up

My question is what would be the best way to set-up the DHCP for the IP Phones. I want the IPO to act as the DHCP server, but not sure if I should have each one acting as a seperate DHCP server? Each site will host approx 50 - 100 IP phones. If I have all 4 setup as DHCP Servers, (giving out different ranges of course), when the phones boot up how do they know which chassis/call server to connect to? Ex. If a phone is connected at site A, what if it pulls an IP handed out by Site C's DHCP server, and connects to that Site? Am I going to have to manually type the call server address into each & every phone?

Any Suggestions?

Thanks...

 

[paulTB]

Definitely let each IP office handle DHCP as if the links go down the sites will have problems.

The DHCP server on the IP Office is quite basic so you cannot do DHCP Relay.

If the links between the sites are good and you have a good DHCP server (Windows, Linux or a quality Layer 3 switch) than you could have a centralised DHCP server but given the need to setup option strings which the Avaya will do for you that makes the setup easier.

My only other reservation is on the size of each site, we generally have a rule that for more than 75 extensions we have a separate DHCP & HTTP server for performance. If their is only 50 than you will not have a problem.

 

[tlpeter]

You can use DHCP relay as the IPO can handle up to 8 scopes of IP ranges.
But you need to setup relay on the router and not on the IPO
I agree about letting this be done by the IPO adn it can handdle DHCP request easily for more then 300 phones.

BAZINGA!

I'm not insane, my mother had me tested!

 

[rgunther]

I probably won't use DHCP relay... I will probably just let each individual site act as their own DHCP server for the phones. Am I going to have to manually type in the call server address on each and every phone?

 

[tlpeter]

No, you will need to tell the phones to go to the correct voice vlan by using a option 242 with L2Q=1,L2QVLAN=11,VLANTEST=0
See this doc:

http://www.ipofficeassistance.com/HOWTO_DHCP_IP_Phones.html

BAZINGA!

I'm not insane, my mother had me tested!

 

[rgunther]

Okay, so now I have each IP500v2 acting as its own DHCP for its phones (9611G). Everything is working just fine, but now I keep getting the DHCP: ACK ERROR on the phones... Am I better to just have one of the IP500's acting as a DHCP, or every IP500v2 (4 total) acting as a seperate DCHP?

Current Setup -
Site A - 192.168.42.1 / DHCP Range 192.168.42.5 & Up
Site B - 192.168.43.1 / DHCP Range 192.168.43.5 & Up
Site C - 192.168.44.1 / DHCP Range 192.168.44.5 & Up
Site D - 192.168.45.1 / DHCP Range 192.168.45.5 & Up

Why would I be getting DCH ACK Errors?

 

[DavidCT]

rgunther,

DHCP ACK... sounds like you either have VLAN's set up on the switch and there's a DHCP server on a trunk port that see's the two network (data and voice), or you have two DHCP servers on the same subnet.

 

[rgunther]

Well im testing for right now using just these 4 IPO's, connected through a 4 port switch.... since the DHCP is turned on on every IP500 could this be causing the DCHP ACK error?

 

[DavidCT]

Definitely.

You've got four dhcp servers on one switch. I recommend you get a "smarter" switch with VLANs for your testing.

It's also good to know you are tasting your setup before install.

 

[rgunther]

Also, these will be connected in 4 different schools in a SCN.... How will this work with their current LAN? If I have their network guy assign ports on seperate VLAN's for me to plug the IP500v2's into, will I still run into issues with their current DHCP? How do the phones know to grab an address from the IP500's DHCP server, and not one of their LAN DHCP?

Thanks

 

[tlpeter]

Tell him to put the phones on ports with the data vlan untagged and voice tagged.
Also put the IPO and perhaps the voicemail server (if needed in the voice vlan) on untagged voice vlan ports.
The Lan DHCP should have an option 242 with L2QVLAN=(voice vlan id), L2Q=1



BAZINGA!

I'm not insane, my mother had me tested!

 

[rgunther]

I can do that, but i'm assuming they do not know which ports are going to be phones. In a couple of the sites, the wiring is just a bunch of cables coming down into POE switches with no labels....

 

[tlpeter]

Good luck then
I would tell the IT guy to fix his network otherwise no service for a bad IP phone implementation.
Officially Avaya will not even look at your problems when you have them without a proper network check.

Are there going to be PC's connected to the phones?



BAZINGA!

I'm not insane, my mother had me tested!

 

[mattKnight]

>Tell him to put the phones on ports with the data vlan untagged and voice tagged

This
But in fact - any edge ports should be configured in this fashion

Take Care

Matt
I have always wished that my computer would be as easy to use as my telephone.
My wish has come true. I no longer know how to use my telephone.