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If your LAN environment does not include Virtual LANs (VLANs), ignore this section. Otherwise, this section contains information on how to administer 4600 Series IP Telephones to minimize registration time and maximize performance in a VLAN environment.
The system value L2QVLAN (initially set to "0"), identifies the 802.1Q VLAN IDentifier. This default value indicates "priority tagging" as defined in IEEE 802.IQ Section 9.3.2.3, which specifies that the Ethernet switch in your network closet should automatically insert the default VLAN for the switch port without changing the user priority of the frame (cf. IEEE 802.1D and 802.1Q).
However, you might not want the default VLAN to be used for voice traffic; for example, you may have administered a VLAN specifically for IP telephony. In this case, you need to ensure the switch is configured to allow frames tagged by the 4600 Series IP Telephone through without overwriting or removing them. In addition, you will want to set the system value L2QVLAN to the VLAN ID appropriate for your voice LAN.
Another system value you can administer as of Release 1.8 software, is NVVLANTEST, which stands for the number of seconds the 4600 IP Series Telephone waits for a DHCPOFFER message when using a non-zero VLAN ID (the default is “60” seconds). Using this value insures the telephone can return to the default VLAN if an invalid VLAN ID is administered or if the phone is moved to a port where the value in L2QVLAN is invalid. The default value is fairly long, to allow for the scenario that a major power interruption is causing the 4600 Series IP Telephones to restart, but time should be allowed for network routers, the DHCP/TFTP Servers, etc. to be returned to service. If the telephone is restarted for whatever reason and the NVVLANTEST time limit expires, the telephone assumes the administered VLAN ID is invalid and re-initiates registration with the default VLAN ID.
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