Specifications
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Console#spanning-tree protocol-migration ethernet 1/5
VLAN
You can use virtual LANs (VLANs) to assign ports on the switch to any of up to 255 LAN groups. In conventional networks with routers, broadcast and
multicast traffic is split up into separate domains. Switches do not inherently support broadcast domains, which can lead to broadcast storms in large
networks. By using IEEE 802.1Q-compliant VLANs and GARP VLAN Registration Protocol (GVRP), you can organize any group of network nodes into separate
broadcast domains, confining broadcast and multicast traffic to the originating group. This also provides a more secure and cleaner network environment. For
more information on how to use VLANs, see "VLANs."
The VLAN page includes links to the following pages:
l VLAN Membership
l Port Settings
l Trunk Settings
l GVRP
VLAN Membership
On the VLAN Membership page, you define VLAN groups. The following options are available:
l Show VLAN — Select the VLAN for which you want to edit the membership setting.
l Name — Specifies user-defined name of the VLAN.
l VLAN ID — Specifies numeric ID of the VLAN (1 to 4094).
l Remove VLAN — Check this box to remove an existing VLAN.
l Status — Configures the VLAN as Active or Suspended.
l Creation — Indicates whether the VLAN has been created as a permanent (static) VLAN or has been dynamically created through GVRP.
l Port/Trunk toggle buttons — Allows you to select VLAN membership for each port or trunk by toggling the value of the Port/Trunk button:
¡ 'U': The port is a member of the VLAN. All packets transmitted by the port will be untagged, that is, not carry a tag and therefore not carry VLAN
or CoS information.
¡ 'T': The port is a member of the VLAN. All packets transmitted by the port will be tagged, that is, carry a tag and, therefore, carry VLAN or CoS
information.
¡ 'F': The port is forbidden from automatically joining the VLAN through GVRP. For more information, see "GVRP."
¡ 'BLANK': The port is not a member of the VLAN. Packets associated with this VLAN will not be transmitted by the port.
The VLAN tagging option is a standard set by the IEEE to facilitate the spanning of VLANs across multiple switches. For more information, see "VLANs" and the
IEEE Std 802.1Q-1998 Virtual Bridged Local Area Networks.
To save any changes you make in this page, click Apply Changes. If you don't want to save the changes, click Refresh.
Adding VLAN Group
1. Select Add a new VLAN from the Show VLAN drop-down menu.
2. Complete the VLAN Name and VLAN ID fields.
3. Add VLAN members.
See "VLAN Membership" for more information on VLAN members.
4. Click Apply Changes.
Removing VLAN Group
1. Select the VLAN that you want to remove from the Show VLAN drop-down menu.
2. Check the Remove VLAN box for the VLAN that you want to remove.
3. Click Apply Changes.
Adding VLAN Membership
1. Select the VLAN that you want to edit from the Show VLAN drop-down menu.
2. Change the VLAN member by clicking the port icon until the desired state (T [tagged] or U [untagged]) or a blank appears.
3. Click Apply Changes.
NOTE: If you remove a VLAN group with existing port members, the ports will rejoin the default VLAN in untagged mode.