Znyx Networks bh5700 - Manual (Page 48)

Overview of OpenArchitect VLAN Interfaces
A zhp device is associated with one VLAN. zhp may have one or more physical ports and their
associated zre devices. A VLAN from the viewpoint of the switch is a logical mapping of ports
based on intended use. The primary purpose of a VLAN is to isolate traffic and enable
communication to flow more efficiently within groups of mutual interest. The switch is used to
bridge from one VLAN to another. Figure 4.1: Fabric VLANs is an example of a custom layer2
VLAN network structure in a fabric switch.
In the Figure 4.1, four VLANs for each fabric switch are used to organize traffic. This is just one
example of how a layer 2 switch could be configured with the fabric switch.
Tagging and Untagging VLANs
The OpenArchitect switch is capable of switching VLAN tagged and untagged data packets.
VLAN tagged packets conform to the 802.1q specification and the packet header contains an
additional four bytes of VLAN tag information. A given port can be specified to accept VLAN
tagged or untagged traffic. Internally, all traffic for a particular VLAN is treated as tagged traffic.
Ethernet Switch Blade User's Guide release 3.2.2j page 48
Figure 4.1: Fabric VLANs