
VoIP Traffic Configuration
131
Instruction Manual - NXA-ENET8-POE+
VoIP Traffic Configuration
This chapter covers the following topics:
Global Settings
- Enables VOIP globally, sets the Voice VLAN, and the aging time for attached ports.
Telephony OUI List
- Configures the list of phones to be treated as VOIP devices based on the specified Organization Unit
Identifier (OUI).
Port Settings
- Configures the way in which a port is added to the Voice VLAN, the filtering of non-VoIP packets, the
method of detecting VoIP traffic, and the priority assigned to voice traffic.
Overview
When IP telephony is deployed in an enterprise network, it is recommended to isolate the Voice over IP (VoIP) network traffic from
other data traffic. Traffic isolation can provide higher voice quality by preventing excessive packet delays, packet loss, and jitter.
This is best achieved by assigning all VoIP traffic to a single Voice VLAN.
The use of a Voice VLAN has several advantages. It provides security by isolating the VoIP traffic from other data traffic.
End-to-end QoS policies and high priority can be applied to VoIP VLAN traffic across the network, guaranteeing the bandwidth it
needs. VLAN isolation also protects against disruptive broadcast and multicast traffic that can seriously affect voice quality.
The switch allows you to specify a Voice VLAN for the network and set a CoS priority for the VoIP traffic. The VoIP traffic can be
detected on switch ports by using the source MAC address of packets, or by using LLDP (IEEE 802.1AB) to discover connected VoIP
devices. When VoIP traffic is detected on a configured port, the switch automatically assigns the port as a tagged member the
Voice VLAN. Alternatively, switch ports can be manually configured.
Configuring VoIP Traffic
Use the Traffic > VoIP (Configure Global) page to configure the switch for VoIP traffic. First enable automatic detection of VoIP
devices attached to the switch ports, then set the Voice VLAN ID for the network. The Voice VLAN aging time can also be set to
remove a port from the Voice VLAN when VoIP traffic is no longer received on the port.
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:
NOTE:
The Voice VLAN ID cannot be modified when the global Auto Detection Status is enabled.
Perform these steps to configure global settings for a Voice VLAN:
1.
Click
Traffic
>
VoIP
.
2.
Select
Configure Global
from the Step list.
3.
Enable
Auto Detection
.
4.
Specify the Voice VLAN ID.
5.
Adjust the Voice VLAN Aging Time if required.
6.
Click
Apply
.
Traffic - VoIP Options
Auto Detection Status
Enables the automatic detection of VoIP traffic on switch ports. (Default: Disabled)
Voice VLAN
Sets the Voice VLAN ID for the network. Only one Voice VLAN is supported and it must already be
created on the switch. (Range: 1-4094)
Voice VLAN 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: 5-43200 minutes; Default: 1440 minutes)
FIG. 149
Configuring a Voice VLAN