Licensing Requirements and Limitations for Voice VLANs
Involved Network Elements
Other network elements are not required.
Licensing Requirements
The voice VLAN is a basic feature of a switch and is not under license control.
Feature Support in V200R019C10
All models of S2720, S5700, and S6700 series switches support Voice VLAN.
For details about software mappings, visit Hardware Query Tool and search for the desired product model.
Feature Limitations
To transmit different services, ensure that the voice VLAN and default VLAN on an interface are different VLANs.
Only one VLAN on an interface can be configured as a voice VLAN at a time.
After a voice VLAN is configured on an interface, VLAN mapping, VLAN stacking, or traffic policies cannot be configured on the interface.
- Do not set the VLAN ID to 0 on an IP phone.
- The S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S do not support the automatic mode.
- In auto mode, access, negotiation-auto, or negotiation-desirable interfaces cannot be added to a voice VLAN. To add the interface to the voice VLAN, run the port link-type command to change the link type of the interface to trunk or hybrid.
- When an IP phone is connected to a switch through the OUI-based voice VLAN, disable LLDP on the interface. If LLDP is enabled on the interface, the switch will allocate a voice VLAN ID to the IP phone. The IP phone sends tagged packets to the switch, whereas the switch sends untagged packets to the IP phone. As a result, the IP phone cannot go online.
- In V200R003 and later versions, the automatic mode takes effect only when the voice-vlan remark-mode mac-address command is configured to increase the priority of voice packets based on MAC addresses and the voice-vlan enable command without include-untagged specified is configured to enable voice VLAN on the interface.