VoIP Traffic Configuration
133
Instruction Manual - NXA-ENET8-POE+
Configuring VoIP Traffic Ports
Use the Traffic > VoIP (Configure Interface) page to configure ports for VoIP traffic, you need to set the mode (Auto or Manual),
specify the discovery method to use, and set the traffic priority. You can also enable security filtering to ensure that only VoIP
traffic is forwarded on the Voice VLAN.
Command Usage
All ports are set to VLAN hybrid mode by default. Prior to enabling VoIP for a port (by setting the VoIP mode to Auto or Manual as
described below), first ensure that VLAN membership is not set to access mode (see the
Adding Static Members to VLANs
on page 89).
The following table lists the options on this page:
Perform these steps to configure VoIP traffic settings for a port:
1.
Click
Traffic
>
VoIP
.
2.
Select
Configure Interface
from the Step list.
3.
Configure any required changes to the VoIP settings each port.
4.
Click
Apply
.
Traffic - VoIP Options
Mode
Specifies if the port will be added to the Voice VLAN when VoIP traffic is detected. (Default: None)
• None - The Voice VLAN feature is disabled on the port. The port will not detect VoIP traffic or be
added to the Voice VLAN.
• Auto - 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 802.1AB
(LLDP). When OUI is selected, be sure to configure the MAC address ranges in the Telephony
OUI list.
• Manual - The Voice VLAN feature is enabled on the port, but the port must be manually added to
the Voice VLAN.
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 that discovers 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 vendors 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 the
section on page 190 for more information on LLDP.
Priority
Defines a CoS priority for port 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 for the port. (Range: 0-6;
Default: 6)
Remaining Age
Number of minutes before this entry is aged out.
The Remaining Age starts to count down when the OUI's MAC address expires from the MAC
address table. Therefore, the MAC address aging time should be added to the overall aging time.
For example, if you configure the MAC address table aging time to 30 seconds, and the voice VLAN
aging time to 5 minutes, then after 5.5 minutes, a port will be removed from voice VLAN when VoIP
traffic is no longer received on the port. Alternatively, if you clear the MAC address table manually,
then the switch will also start counting down the Remaining Age.
When VoIP Mode is set to Auto, the Remaining Age will be displayed. Otherwise, if the VoIP Mode is
Disabled or set to Manual, the remaining age will display NA.
FIG. 152
Configuring Port Settings for a Voice VLAN