1-11z The voice VLAN function can be enabled for only one VLAN at one time.z If the Link Aggregation Control Protocol (LACP) is enabled on a port, voice VLAN feature cannot beenabled on it.z Voice VLAN function can be enabled only for the static VLAN. A dynamic VLAN cannot beconfigured as a voice VLAN.z When ACL number applied to a port reaches to its threshold, voice VLAN cannot be enabled onthis port. You can use the display voice vlan error-info command to locate such ports.z When a voice VLAN operates in security mode, the device in it permits only the packets whosesource addresses are the identified voice OUI addresses. Packets whose source addressescannot be identified, including certain authentication packets (such as 802.1x authenticationpackets), will be dropped. Therefore, you are suggested not to transmit both voice data and servicedata in a voice VLAN. If you have to do so, make sure that the voice VLAN does not operate insecurity mode.z The voice VLAN legacy feature realizes the communication between 3Com device and othervendor's voice device by automatically adding the voice VLAN tag to the voice data coming fromother vendors’ voice device. The voice vlan legacy command can be executed before voice VLANis enabled globally and on a port, but it takes effect only after voice VLAN is enabled globally andon the port.To assign a trunk port or a hybrid port to the voice VLAN, refer to VLAN Configurations of this manualfor the related command.Displaying and Maintaining Voice VLANTo do… Use the command… RemarksDisplay information about the ports on which voiceVLAN configuration failsdisplay voice vlanerror-infoDisplay the voice VLAN configuration status display voice vlan statusDisplay the OUI list display voice vlan ouiDisplay the ports operating in the voice VLAN display vlan vlan-idIn any view
