Accton Technology ES3528M-SFP manual VoIP Traffic Configuration, Configuring VoIP Traffic

VoIP Traffic Configuration 3

VoIP Traffic Configuration

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 helps prevent excessive packet delays, packet loss, and jitter, which results in higher voice quality. 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 the VoIP VLAN traffic across the network, guaranteeing the bandwidth it needs. The VLAN isolation also protects against disruptive broadcast and multicast traffic that can seriously affect voice quality.

The switch allows you to specify the Voice VLAN for the network and set a CoS priority for the VoIP traffic. 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

To configure the switch for VoIP traffic, first enable the automatic detection of VoIP devices attached to 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 Attributes

•Auto Detection Status – Enables the automatic detection of VoIP traffic on switch ports. (Default: Disabled)

•Voice VLAN ID – 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)

•Vioce 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).

Note: The Voice VLAN ID cannot be modified when the global Auto Detection Status is enabled.

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