Vlan Considerations; Vlan Tagging; Vlan Default Value And Priority Tagging - Avaya 1600 Series Administrator's Manual

Administering Deskphone Options
Note:
Table 9 applies to all 1600 Series IP Deskphones. Certain 1600 IP Deskphones might
Note:
have additional, optional information that you can administer. For more information, see
Chapter 8: Administering Applications and

VLAN Considerations

If your LAN environment does not include Virtual LANs (VLANs), ignore this section. Otherwise, this
section contains information on how to administer 1600 Series IP Deskphones to minimize registration
time and maximize performance in a VLAN environment.

VLAN Tagging

IEEE 802.1Q tagging (VLAN) is a useful method of managing VoIP traffic in your LAN. Avaya
recommends that you establish a voice LAN, set L2QVLAN to that VLAN, and provide voice traffic with
priority over other traffic. If LLDP was used to set the deskphones' VLAN, that setting has absolute
authority. Otherwise, you can set VLAN tagging manually, by DHCP, or in the 46xxsettings.txt file.
If VLAN tagging is enabled (L2Q=0 or 1), the 1600 Series IP Deskphones set the VLAN ID to
L2QVLAN, and VLAN priority for packets from the deskphone to L2QAUD for audio packets and
L2QSIG for signalling packets. The default value (6) for these parameters is the recommended value
for voice traffic in IEEE 802.1D.
Regardless of the tagging setting, a 1600 Series IP Deskphone will always transmit packets from the
deskphone at absolute priority over packets from secondary Ethernet. The priority settings are useful
only if the downstream equipment is administered to give the voice LAN priority.

VLAN Default Value and Priority Tagging

The system value L2QVLAN is initially set to "0" and identifies the 802.1Q VLAN Identifier. This default
value indicates "priority tagging" as defined in IEEE 802.IQ Section 9.3.2.3. Priority tagging specifies
that your network closet Ethernet switch automatically insert the switch port default VLAN without
changing the user priority of the frame (cf. IEEE 802.1P and 802.1Q).
If you do not want the default VLAN to be used for voice traffic:
Ensure that the switch configuration lets frames tagged by the 1600 Series IP Deskphone through
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without overwriting or removing them.
Set the system value L2QVLAN to the VLAN ID appropriate for your voice LAN.
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72 1600 Series IP Deskphone Administrator Guide
Options.