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VLAN Considerations

Issue 1 January 2008 83

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 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 Avaya Agent Deskphone 16CC telephones set

the VLAN ID to L2QVLAN, and the VLAN priority for packets from the telephone 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, an Avaya Agent Deskphone 16CC telephone will always

transmit packets from the telephone at absolute priority over packets from secondary Ethernet.

The priority settings are useful only if the downstream equipment is administered to give the

voice VLAN priority.

VLAN Detection

The telephones support automatic detection of the condition where the L2QVLAN setting is

incorrect. When VLAN tagging is enabled (L2Q= 0 or 1) initially the telephone transmits DHCP

messages with IEEE 802.1Q tagging and the VLAN set to L2QVLAN. The telephones will

continue to do this for VLANTEST seconds.

● If the VLANTEST timer expires and L2Q=1, the telephone sets L2QVLAN=0 and transmits

DHCP messages with the default VLAN (0).

● If the VLANTEST timer expires and L2Q=0, the telephone sets L2QVLAN=0 and transmits

DHCP messages without tagging.

● If VLANTEST is 0, the timer will never expire.

Note:

Note: Regardless of the setting of L2Q, VLANTEST, or L2QVLAN, you must have

DHCP administered so that the telephone will get a response to a

DHCPDISCOVER when it makes that request on the default (0) VLAN.

After VLANTEST expires, if a telephone receives a non-zero L2QVLAN value,

the telephone will release the IP Address and send DHCPDISCOVER on that

VLAN. Any other release will require a manual reset before the telephone will

attempt to use a VLAN on which VLANTEST has expired. See the Reset

procedure in Chapter 3 of the Avaya Agent Deskphone 16CC Installation and

Maintenance Guide.

The telephone ignores any VLAN ID administered on the Communication

Manager call server.

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Avaya 16CC Guía de usuario Pagina 83