Chapter 7: Configure the DHCP Server
The Avaya IP Deskphones support two basic Dynamic Host Configuration Protocol (DHCP)
mechanisms to provide configuration information to the IP Deskphones. These mechanisms are the
following:
• Normal DHCP
• DHCP VLAN phase
Normal DHCP
The normal DHCP is used to configure standard IP parameters such as IP address, NetMask,
default gateway, and DHCP lease parameters. The message sequence consists of Discover, Offer,
Request, and Acknowledge. The IP Deskphones can also insert an optional phase. To include an
optional phase, the first phase is used to discover and configure the voice VLAN using a Avaya
proprietary method. The second phase then proceeds normally on the discovered VLAN. If the
DHCP VLAN discovery is not used, then there is only a single phase.
DHCP VLAN Phase
The DHCP site and vendor specific options contain VLAN information to configure VLANs. The
VLAN parameters are text string embedded in the standard DHCP Vendor and Site Specific options.
You can acquire the VLAN parameters using 802.1ab and acquire IP address parameters using
DHCP.
If the IP Deskphone does not contain VLAN configuration provisioned manually or through LLDP,
the IP Deskphone attempts to determine the VLAN during DHCP VLAN Phase. If the IP Deskphone
does find a VLAN configuration, it proceeds to the DHCP Configuration Phase. If the VLAN Phase
(VLAN configured through DHCP) is successful, then the VLAN Phase finishes with a final DHCP. A
release message appears after the completion of the Configuration Phase.
The following is the procedure to configure the Voice VLAN using DHCP, assuming VLAN is not
configured using any other method:
1. The IP Deskphone sends a DHCP request using an untagged (no VLAN) packet during any
of the following scenarios:
• The customer network is configured to handle untagged packets; for example, retag them
to a specific VLAN.
102 SIP Software for Avaya 1200 Series IP Deskphones-Administration March 2015
Comments? infodev@avaya.com
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