Rockwell Automation 1783-Mxxx Stratix 8000 and 8300 Ethernet Managed Switches User Manual - Manual (Page 67)

Rockwell Automation Publication 1783-UM003I-EN-P - March 2014 67
Switch Software Features Chapter 3
Devices attached to switch ports in different VLANs cannot communicate with
each other through the switch. Inter-VLAN communication requires a router or
Layer 3 switch. The router or Layer 3 switch must be configured to support
routing across VLANs (inter-VLAN routing), and additional security policies
must be set.
If your network is also using a DHCP server, ensure that the server is accessible to
the devices in all the VLANs.
The following figure is an example network that uses VLANs based on different
network traffic and network users. Organizing a network around these factors
helps to define the size and membership of the VLANs in the network.
Figure 8 - VLANs in a Stratix 8000 Switch Network
Isolate Different Traffic Types
Isolating data traffic from delay-sensitive traffic, such as voice traffic, ensures the
quality of the voice transmission. In
Figure 8 on page 67 , switch ports connected
to the IP phones belong to VLAN 3, a VLAN that is configured to provide Voice
over IP (VoIP) services on these connections, meaning priority is given to voice
traffic over regular IP data traffic. Voice traffic from the phone and IP-phone
service requests to an IP PBX server have priority over traffic from the desktop
devices attached to the IP phones.
To further isolate data traffic from voice traffic, the data traffic from the attached
desktop devices can be assigned to a separate VLAN.