Avaya Media Gateway G250 - Manual (Page 166)

VLANs
166 Avaya Integrated Management Release 4.0.1 Software Update Manager
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 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 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.