Started running out of IPs on LAN subnet, so decided to look into separating the Voice and Data on our Avaya 9611 phones. This article assumes you have full access to switches and DHCP server. This requires modifying the switch ports, updating the DHCP server scope, and adding a sub interface to your router with the VLAN ID.
- Added the following line for the DHCP Server Options:
L2Q=1,L2QVLAN=15,VLANTEST=0 – The VLAN ID will show up on the phone display as 15 now, press Home -> Network Options -> IP Parameters. - Update the port on the switch to include the Data VLAN (1) and Voice VLAN (15). The port configuration should also be set to untagPvidOnly – this is because the data port VLAN is 1 and does not recognize tagging. If you have another switch, make sure to add 15 to the trunk port between the switches.
- Create a sub interface (we are using a SW TZ500, other routers will use different verbiage. The sub interface has a DHCP server attached and using VLAN ID 15.
Okay, now reboot your Avaya phone and plug into the data port of the phone. Your PC will pickup an address from your data subnet usually 1 and your phone will pickup an IP from the VLAN 15 sub interface DHCP server, in this case we have the phone assigned with 10.0.15.0/24 and the data subnet 10.0.3.0/24.