Three-Port Switch Support; Vlan Ids - Nortel 2001 Installation And Operation Manual

Page 260 of 302

Three-port switch support

VLAN IDs

553-3001-368 Standard 4.00
Appendix A: 802.1Q VLAN description
For more information, see the IP Softphone 2050 section: "QoS tab" on
page 167.
The IP Phone 2002 and IP Phone 2004 three-port switch does not interpret the
802.1Q header, but rather, allows the packets to pass through unmodified.
Priority is achieved on a per port basis. The phone "port" traffic has higher
priority over the Ethernet port to which the PC is connected.
An IP Phone can receive Broadcast frames from a PC's data VLAN. Any data
network broadcast storm packets from the network are seen by the IP Phone.
This type of traffic does not adversely affect the IP Phone.
The VOICE and DATA VLAN ID fields can be specified on a "per interface"
basis. There is only one network interface on the IP Phone; however, the IP
Phone has two internal IDs, one for voice and one for data traffic. The IP
Phone firmware can detect and route the voice and data traffic. The VLAN ID
fields are "global" settings. That is, all voice packets transmitted by the IP
Phone have the same VOICE VLAN ID. If DATA VLAN is enabled, the
telephone will add the DATA VLAN ID to untagged traffic. However, if the
traffic arrivng on the PC port is already tagged, the frame will 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 manual
configuration user interface.
• Or, in the case of the VOICE VLAN ID, the VOICE VLAN ID can also
be configured by the DHCP parameter when using the Automatic VLAN
discovery using DHCP approach.
February 2005