802.1x (EAP) Port-based network access control 85server to provide Voice VLAN information mustbe on the Data VLAN. If the DHCP server is noton the Data VLAN, the IP Phone 1120E failsto receive the DHCP information and fails toregister. In addition, another DHCP server mustreside in the Voice VLAN to provide the networkparameters required. For more information, seethe section on DHCP Auto VLAN Discovery.4095 All telephony traffic that is transmitted on thetelephony port has an 802.1q header appendedand its Voice VLAN ID is set to the valuemanually configured here. Place the cursor overthe 4095 and press the enter NAV key to modifythis value to the desired Voice VLAN tag. Notethat the value 4095 is not a valid VLAN ID. Thisis intentional to ensure a proper VLAN ID isentered.VLAN FilterConfigure the VLAN Filter (not available if Voice VLAN is set to No).Table 17VLAN FilterVLAN Filter Setting ResultEnabled (box is checked) Traffic is forwarded to the IP Phone 1120E port,based on a review of the MAC address of thepacket as well as the 802.1q tag value. Trafficis forwarded through the IP Phone 1120E port,(to the network stack of the telephone), only ifthe packet matches the MAC address of the IPPhone 1120E and contains the Voice VLAN tag.If the Automatic VLAN Discovery feature is used,the filter is adjusted dynamically as the IP Phone1120E validates the VLAN suggested by DHCP.Disabled The VLAN filter is disabled by default. If theVLAN filter is disabled, traffic is forwarded to theIP Phone 1120E port based only on a review ofthe MAC address of the packet. The IP Phone1120E accepts traffic addressed to the MACaddress of the IP Phone 1120E as well as anybroadcast or multicast packets from any VLAN.Disable PC PortWith a disabled PC Port, the IP Phone 1120E with SIP Firmware does notreceive or send packets to or from the PC port. No device can use thePC port to connect to the network.SIP Firmware Release 1.1 for IP Phone 1120E AdministrationNN43112-300 02.03 Standard27 May 2008Copyright © 2008, Nortel Networks.