LevelOne GEP-1070 - Page 182

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Port Configuration
◆ Mode – Specifies if the port will be added to the Voice VLAN.
(Default: Disabled)
■ Disabled – The Voice VLAN feature is disabled on the port. The port will not detect VoIP
traffic or be added to the Voice VLAN.
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3. MSTP must be disabled before the Voice VLAN is enabled (see "Configuring Global
Settings for STA" on page 119), or the Voice VLAN port mode is set to Auto or Forced.
This prevents the spanning tree’s ingress filter from dropping VoIP traffic tagged for the
Voice VLAN.
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■ Auto
3
– The port will be added as a tagged member to the Voice VLAN when VoIP traffic
is detected on the port. You must select a method for detecting VoIP traffic, either OUI or
LLDP (802.1ab).
When OUI is selected, be sure to configure the MAC address ranges in the Telephony OUI
list.
■ Forced
3
– The Voice VLAN feature is enabled on the port.
◆ Security – Enables security filtering that discards any non-VoIP packets received on the
port that are tagged with the voice VLAN ID.
VoIP traffic is identified by source MAC addresses configured in the Telephony OUI list, or
through LLDP which is used to discover VoIP devices attached to the switch. Packets
received from non-VoIP sources are dropped. (Default: Disabled)
◆ Discovery Protocol – Selects a method to use for detecting VoIP traffic on the port.
(Default: OUI)
■ OUI – Traffic from VoIP devices is detected by the Organizationally Unique Identifier
(OUI) of the source MAC address. OUI numbers are assigned to manufacturers and form
the first three octets of a device MAC address. MAC address OUI numbers must be
configured in the Telephony OUI list so that the switch recognizes the traffic as being from
a VoIP device.
■ LLDP – Uses LLDP (IEEE 802.1ab) to discover VoIP devices attached to the port. LLDP
checks that the “telephone bit” in the system capability TLV is turned on. See "Link Layer
Discovery Protocol" for more information on LLDP.
■ Both – Both OUI table lookup and LLDP are used to detect VoIP traffic on a port.
This option only works when the detection mode is set to “Auto.” LLDP should also be
enabled before setting the discovery protocol to “LLDP” or “Both.” Note that changing the
discovery protocol to “OUI” or “LLDP” will restart auto detection process.
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