User's Manual

C HAPTER 4 | Configuring the Switch
Managing VoIP Traffic
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◆ Aging Time – The time after which a port is removed from the Voice
VLAN when VoIP traffic is no longer received on the port. (Range: 10-
10,000,000 seconds; Default: 86400 seconds)
◆ Traffic Class – Defines a service priority for traffic on the Voice VLAN.
The priority of any received VoIP packet is overwritten with the new
priority when the Voice VLAN feature is active on a port. (Range: 0-7;
Default: 7)
The switch provides eight priority queues for each port. For information
on how these queues are used, see "Configuring Egress Port Scheduler"
on page 193.
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.
■
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.