The Vlan Default Value And Priority Tagging; Automatic Detection Of A Vlan - Avaya 9601 Administering

Administering deskphone options
Related Links
Administering a VLAN

The VLAN default value and priority tagging

The parameter L2QVLAN identifies the 802.1Q VLAN Identifier and is initially set to 0. This default
value indicates priority tagging and specifies that your network Ethernet switch automatically insert
the default VLAN ID without changing the user priority of the frame.
But some switches do not process 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, set the value of L2QVLAN to the
VLAN ID appropriate for your voice LAN.
You can also administer another parameter VLANTEST that defines the number of seconds the
9600 Series IP Deskphone waits for a DHCPOFFER message when using a non-zero VLAN ID.
The VLANTEST default is 60 seconds. If you use VLANTEST, the deskphone 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 of VLANTEST 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, and other
equipment to be returned to service. If the deskphone restarts for any reason and the VLANTEST
time limit expires, the administered VLAN ID becomes invalid. The deskphone then initiates
operation with a VLAN ID of 0. Or, if the value of L2Q is 0, that is auto, the deskphone turns off
tagging until the L2QVLAN is set to a non-zero value or until the deskphone verifies that the network
can support tagged frames.
Setting VLANTEST to "0" causes the phone to use a non-zero VLAN indefinitely to attempt DHCP.
In other words, the deskphone does not return to the default VLAN.
Related Links
Administering a VLAN

Automatic detection of a VLAN

The phones support automatic detection of the L2QVLAN setting that is incorrect. When the value of
L2QVLAN is not 0 and VLAN tagging is enabled, L2Q= 0 or 1, initially the 9600 Series IP
Deskphone transmits DHCP messages with IEEE 802.1Q tagging and sets the VLAN ID to
L2QVLAN. The phones will continue to do this for number of seconds configured by VLANTEST.
• If L2Q=1 and the VLANTEST timer expires because the phone has not received a
DHCPOFFER, the phone sets L2QVLAN=0 and transmits DHCP messages with the default
VLAN (0).
• If L2Q=0 and the VLANTEST timer expires because the phone has not received a
DHCPOFFER, the phone sets L2QVLAN=0 and transmits DHCP messages without tagging.
Administering Avaya 9601/9608/9611G/9621G/9641G/9641GS IP Deskphones SIP
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Comments on this document? infodev@avaya.com
August 2015