User's Manual

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15.5.4 Dynamic VLAN Troubleshooting
 On the switch configured with dynamic VLAN, if the two connected equipment (e.g. PC) are both
belongs to the same dynamic VLAN, first communication between the two equipments may not go
through. The solution will be letting the two equipments positively send data packet to the switch (such
as ping), to let the switch learn their source MAC, then the two equipments will be able to communicate
freely within the dynamic VLAN.
Figure 15-9 Dynamic VLAN Troubleshooting
 Priority of dynamic vlan and vlan ingress filtering for processing packets is: dynamic vlan> vlan ingress
filtering
15.6 Voice VLAN Configuration
15.6.1 Introduction to Voice VLAN
Voice VLAN is specially configured for the user voice data traffic. By setting a Voice VLAN and adding the
ports of the connected voice equipments to the Voice VLAN, the user will be able to configure QoS (Quality of
service) service for voice data, and improve the voice data traffic transmission priority to ensure the calling
quality.
The switch can judge if the data traffic is the voice data traffic from specified equipment according to the
source MAC address field of the data packet entering the port. The packet with the source MAC address
complying with the system defined voice equipment OUI (Organizationally Unique Identifier) will be
considered the voice data traffic and transmitted to the Voice VLAN.
The configuration is based on MAC address, acquiring a mechanism in which every voice equipment
transmitting information through the network has got its unique MAC address. VLAN will trace the address
belongs to specified MAC. By This means, VLAN allows the voice equipment always belong to Voice VLAN
when relocated physically. The greatest advantage of the VLAN is the equipment can be automatically placed
into Voice VLAN according to its voice traffic which will be transmitted at specified priority. Meanwhile, when
voice equipment is physically relocated, it still belongs to the Voice VLAN without any further configuration
modification, which is because it is based on voice equipment other than switch port.
192.168.1.100/24 192.168.1.200/24
Ping 192.168.1.100 Ping 192.168.1.200
Dynamic VLAN