Tagged/Untagged Vlans; Displaying Basic Vlan Information - Alcatel OmniStack LS 6248 User Manual

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Configuring the Switch
Note:
If you have host devices that do not support GVRP, you should configure static or
untagged VLANs for the switch ports connected to these devices. But you can still
enable GVRP on these edge switches, as well as on the core switches in the
network.

Tagged/Untagged VLANs

If you want to create a small port-based VLAN for devices attached directly to a
single switch, you can assign ports to the same untagged VLAN. However, to
participate in a VLAN group that crosses several switches, you should create a
VLAN for that group and enable tagging on all ports.
Ports can be assigned to multiple tagged or untagged VLANs. Each port on the
switch is therefore capable of passing tagged or untagged frames. When forwarding
a frame from this switch along a path that contains any VLAN-aware devices, the
switch should include VLAN tags. When forwarding a frame from this switch along a
path that does not contain any VLAN-aware devices (including the destination host),
the switch must first strip off the VLAN tag before forwarding the frame. When the
switch receives a tagged frame, it will pass this frame onto the VLAN(s) indicated by
the frame tag. However, when this switch receives an untagged frame from a
VLAN-unaware device, it first decides where to forward the frame, and then inserts a
VLAN tag reflecting the ingress port's default VID.

Displaying Basic VLAN Information

The VLAN Basic Information Page page displays basic information on the VLAN
type supported by the switch.
Command Attributes
• VLAN ID — Displays the VLAN ID.
• Name — Displays the user-defined VLAN name.
• Type — Displays the VLAN type. The possible field values are:
• Dynamic — The VLAN was dynamically created through GARP.
• Static — The VLAN is user-defined.
• Default — The VLAN is the default VLAN.
• Authentication — Indicates whether authorization is required in order to access
the VLAN. The possible field values are:
• Enabled — Requires authorization in order to access the VLAN.
• Guest — Enables unauthorized users to use the Guest VLAN.
• Disabled — Disables unautherized users from using the Guest VLAN.
• Remove — Removes VLANs. The possible field values are:
• Checked — Removes the selected VLAN.
• Unchecked — Maintains VLANs.
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