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Administering Telephone Options

84 Avaya Agent Deskphone 16CC Administrator Guide

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 802.1D and 802.1Q).

The VLAN ID = 0 (zero) is used to associate priority-tagged frames to the port/native VLAN of

the ingress port of the switch. But some switches do not understand a VLAN ID of zero and

require frames tagged with a non-zero VLAN ID.

If you do not want the default VLAN to be used for voice traffic:

● Ensure that the switch configuration lets frames tagged by the 16CC telephone through

without overwriting or removing them.

● Set the system value L2QVLAN to the VLAN ID appropriate for your voice LAN.

Another system value you can administer is VLANTEST. VLANTEST defines the number of

seconds the telephone waits for a DHCPOFFER message when using a non-zero VLAN ID.

The VLANTEST default is “60” seconds. Using VLANTEST ensures that the telephone returns

to the default VLAN if an invalid VLAN ID is administered or if the phone moves to a port where

the L2QVLAN value is invalid. The default value is long, allowing for the scenario that a major

power interruption is causing the phones to restart. Always allow time for network routers, the

DHCP servers, etc. to be returned to service. If the telephone restarts for any reason and the

VLANTEST time limit expires, the telephone assumes the administered VLAN ID is invalid. The

telephone then initiates registration with the default VLAN ID.

Setting VLANTEST to “0” has the special meaning of telling the phone to use a non-zero VLAN

indefinitely to attempt DHCP. In other words, the telephone does not return to the default VLAN.

Note:

Note: If the telephone returns to the default VLAN but must be put back on the

L2QVLAN VLAN ID, you must Reset the telephone. See the Reset procedure in

the Avaya Agent Deskphone 16CC Installation and Maintenance Guide.

VLAN Separation

VLAN separation is available to control priority tagging from the device on the secondary

Ethernet, typically PC data. The following system parameters control VLAN separation:

● VLANSEP - enables (1) or disables (0) VLAN separation.

● PHY2VLAN - provides the VLAN ID for tagged frames received on the secondary Ethernet

interface.

● PHY2PRIO - the layer 2 priority value to be used for tagged frames received on the

secondary Ethernet interface.

Table 10

provides several VLAN separation guidelines.

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Avaya 16CC Betriebsanweisung Seite 84