Administering A Vlan; About Vlan Tagging; The Vlan Default Value And Priority Tagging - Avaya 9608 Administrator's Manual

Note:
Unless otherwise indicated, Table 12 applies to all 9600 Series IP Deskphones.
Note:
Certain 9600 SIP IP Deskphones might have additional, optional information that
you can administer. For more information, see
Telephone

Administering a VLAN

This section contains information on how to administer 9600 Series SIP IP Telephones to
minimize registration time and maximize performance in a Virtual LAN (VLAN) environment. If
your LAN environment does not include VLANs, set the system parameter L2Q to 2 (off) to
ensure correct operation.

About 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 VLAN, set L2QVLAN to the VLANID of that VLAN, and
provide voice traffic with priority over other traffic. You can set VLAN tagging manually, by
DHCP, or in the 46xxsettings.txt file.
If VLAN tagging is enabled (L2Q= 0 or 1), the 9600 Series SIP IP Telephones set the VLAN ID
to L2QVLAN, and the 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 9600 Series SIP IP Telephone will always transmit packets
from the deskphone at absolute priority over packets from the secondary Ethernet interface (for
example, from an attached PC). The priority settings are useful only if the downstream
equipment is administered to give the voice VLAN priority.
!
Important:
VLAN tags are always removed from frames that egress (go out of) the
Important:
secondary Ethernet interface because many PCs will ignore tagged frames.

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 switch port default VLAN ID without changing the user priority of the
frame.
Options.
Administering a VLAN
Chapter 8: Administering
Issue 1 May 2011 113