Automatic Voice Vlan Id Configuration - Avaya 1110 Fundamentals

Each VLAN ID is specified as follows
• The default VLAN ID is 000 (hex).
• The VOICE and Data VLAN IDs can be specified in the manual configuration user
interface.
• Or, in the case of the VOICE VLAN ID, the VOICE VLAN ID can also be configured by
the DHCP parameter when using the Automatic VLAN discovery using DHCP
approach.

Automatic VOICE VLAN ID configuration

As part of the 802.1Q feature, there are two options to automatically discover the voice VLAN
ID: using DHCP and 802.1ab LLDP. This process reduces the configuration steps since
entering data manually (the VOICE VLAN ID) is not required.
When the Automatic VOICE VLAN Discovery using DHCP approach is used, and the IP Phone
has been configured as such, the following steps are automatically taken to obtain the VOICE
VLAN ID
1. The IP Phones perform an initial DHCP Discovery Request in the default VLAN.
2. The DHCP server returns a DHCP Ack message with an IP address in the data
3. The IP Phone reads and saves the VOICE VLAN IDs.
4. The IP Phone rejects the DHCP offer (accepts it but immediately gives up the
5. The IP Phone reboots and sends a DHCP Discovery Request with the first VLAN
This works because the Layer 2 switch discards every DHCP Discovery Request it receives
from the IP Phone if the VLAN ID does not match the VLAN IDs configured on the port. When
the IP Phone sends a DHCP Discovery Request with the port configured VLAN ID, the packet
passes into the network and the DHCP server Ack message is passed back.
When a DHCP Ack message is received, the IP Phone accepts the offer and saves the IP
address and Node IP address.
For information on how to implement Automatic VOICE VLAN ID, see
Discovery
To use the LLDP MED network policy TLV to provision the Voice VLAN, see
Discovery Protocol
IP Deskphones Fundamentals
VLAN and one or more voice VLAN IDs in the vendor-specific field.
lease).
ID from the saved list. This is repeated for each VLAN ID in the list until a response
is received.
on page 392.
on page 372.
VLAN IDs
DHCP Auto
802.1ab Link Layer
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