VLAN Management
Voice VLAN
Cisco Small Business 300 Series Managed Switch Administration Guide 123
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• Assign ports as candidates to the Voice VLAN. (This is configured by using
the process described in the Configuring VLAN Interface Settings
section.)
• Assign the QoS mode per port to one of the following:
- For a port that has already joined the Voice VLAN, all packets are
assigned to the Voice VLAN as described in the Configuring VLAN
Interface Settings section.
- Only packets that come from IP phones (based on the source OUI MAC
address prefix) by using the procedure described in the Configuring
VLAN Interface Settings section.
• Enter Voice VLAN Class of Service (with or without remarking the packet
VPT) by using the Voice VLAN Properties Page. When remark is selected,
the switch changes the 802.1p priority of the packet at egress. Set the
remarking option as described in the Configuring Voice VLAN Properties
section.
• Configure and update the Telephony OUI table with up to 128 entries (each
entry is a three-octet number) as described in the Configuring Telephony
OUI section. The switch uses the table to determine if a port has Auto Voice
VLAN Membership enabled and will join the voice VLAN.
• Enter the Voice VLAN aging time as described in the Configuring Voice
VLAN Properties section.
Voice VLAN Constraints
The following constraints exist:
• Only one Voice VLAN is supported.
• The Voice VLAN is not supported by DVA (Dynamic VLAN assignment).
• The Voice VLAN must be a static VLAN created manually.
• A VLAN that is defined as a Voice VLAN cannot be removed.
• A new VLAN ID can be configured for the Voice VLAN only if the current
Voice VLAN does not have candidate ports.
• The Voice VLAN cannot be the Guest VLAN.
• The interface VLAN of a candidate port must be in General mode or Trunk
mode.
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