Nortel 2033 Installation And Operation Manual

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Nortel 2033 Installation And Operation Manual Manual pdf 487 page image

Appendix B: 802.1Q VLAN description Page 487 of 600IP Phones Description, Installation, and OperationThe following functions are available on the three-port switch:• hardware VLAN filter• two TX (out) queues on each port —High Priority Queue (HPQ) andLow Priority Queue (LPQ)Therefore, traffic other than Voice VLAN can be filtered by enabling theVLAN filtering feature and taking advantage of the hardware VLAN filter.Voice traffic is always queued to the HPQ thereby providing a higher qualityof service.VLAN IDsThe VOICE and DATA VLAN ID fields can be specified on a per interfacebasis. There is only one network interface on the IP Phone; however, theIP Phone has two internal IDs, one for voice and one for data traffic. TheIP Phone firmware can detect and route the voice and data traffic.The VLAN ID fields are global settings. That is, all voice packets transmittedby the IP Phone have the same VOICE VLAN ID. If DATA VLAN isenabled, the IP Phone will add the DATA VLAN ID to untagged traffic.However, if the traffic arriving on the PC port is already tagged, the framewill pass through unchanged.Each VLAN ID is specified as follows:• The default VLAN ID is 000 (hex).• The VOICE and DATA VLAN IDs can be specified in the manualconfiguration user interface.• Or, in the case of the VOICE VLAN ID, the VOICE VLAN ID can alsobe configured by the DHCP parameter when using the Automatic VLANdiscovery using DHCP approach.Automatic VOICE VLAN ID configurationAs part of the 802.1Q feature, there is an option to automatically discover theVOICE VLAN ID using DHCP. This process reduces the configuration stepssince entering data manually (the VOICE VLAN ID) is not required.