Chapter 9
VLANs Overview
The building blocks of VLANs are switch ports. To build a new VLAN you need to define a VLAN name and number. You can then add switch ports to the VLAN by configuring the PVID of the port to the VLAN number.
The ports are members of the VLAN whose number is their PVID. In addition, you can configure the VLAN tagging mode and binding style of the switch ports. VLAN #1 is the default VLAN and is named Default.
For more information about VLANs, refer to VLANs in The Reference Guide.
Master VLAN List
The master VLAN list is a file on the network management station that contains a list of globally defined VLANs and their names. This list is only available when running Avaya MultiService Network Manager. It is not available when running an Embedded Web Manager. To manage the master VLAN list, use Avaya VLAN Manager. For information on Avaya VLAN Manager, refer to the Avaya MultiService VLAN Manager User Guide.
VLANs that are listed in the master VLAN list are called globally known VLANs. VLANs that are not in the master VLAN list but are configured on a device are called locally known VLANs.
VLAN Tags
Packets can be tagged with VLAN information. When a tagged packet enters a switch port, it maintains its tag. When an untagged packet enters a switch port, the packet is tagged with the port’s PVID (Port VLAN ID).
When a packet arrives at the egress port, the VLAN Binding Style is checked. If the packet’s VLAN tag does not match a VLAN to which the egress port is bound, the packet is discarded. If the tag matches a VLAN to which the egress port is bound, the Tagging Mode is used. If the Tagging Mode is Clear, the packet is forwarded with no VLAN tag. If the Tagging Mode is anything else, the packet is forwarded with its VLAN tag.
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