DHCP subnet with two different IP phones

Mike Diggins mike.diggins at mcmaster.ca
Mon Sep 29 01:08:00 UTC 2014


I have ISC DHCP V4 configured for my Nortel IP Phones. Soon we are 
adding Avaya 96xx series phones which require a different DHCP 
configuration and I could use some assistance how to best handle that. 
Both types of phones will share the same network and address range.

My current configuration:

option space Nortel;
option Nortel.data code 128 = string;

class "ipphones" {
   match if substring(option vendor-class-identifier,0,14) = 

shared-network Voice1 {
   subnet netmask {
     option routers;
     option broadcast-address;
     option subnet-mask;
     allow unknown-clients;
     default-lease-time 86400;
     max-lease-time 86400;
     pool {
       vendor-option-space Nortel;
       option Nortel.data 
       allow members of "ipphones";

I want to add the following new class and options for the 96xx series 
phones but I'm not sure how best to merge the two? Do I add the Avaya 
option statement into the subnet pool declaration above or move the 
Nortel option statement out of the pool declaration and into the class 
"iphones". I want DHCP to respond with only the correct option matched 
to the phone.

option space AVAYA_PHONE;
     option AVAYA_PHONE.242 code 242 = text; #Used by 96xx and newer 

class "avaya-phones" {
     match if substring (option vendor-class-identifier, 0, 13) = 
"ccp.avaya.com" ;
     option AVAYA_PHONE.242 

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