# VLAN

Virtual LANs (VLANs) allow you to configure groups of users independent of their physical location. This arrangement of users or ports is called a logical grouping. The logical group of ports is called a VLAN. Ports or groups of ports in a VLAN are called members. VLANs isolate all traffic, including broadcasts and multicasts from being propagated to members of other VLANs.

CiscoView provides device-level VLAN configuration for the Catalyst 1600. To see VLAN information and configure VLANs, select Device>Configure. The CiscoView Configure Device window appears. Select VLAN from the CATEGORY popup menu. The Configure VLAN window appears. The Configure VLAN window can also be accessed from the VLAN icon in the toolbar.

On a Catalyst 1600, the buttons at the bottom of the Configure VLAN window allow you to perform the following tasks with VLANs:

Create

Delete

Modify

Show Members

Ports

The Configure VLAN window shows two tables:

VLAN Table

VLAN Member Table

# Create

Allows you to create a VLAN. To create a VLAN, do the following:

1. Type the VLAN name into an empty cell.

The VLAN name can be up to 16 characters long.

2. Click Create.

The VLAN is created and given the default broadcast value of impermeable. All newly created VLANs have a broadcast value of impermeable.

# Modify

Allows you to modify all changed cells in the VLAN table. You can change a VLAN name or change its broadcast value (for example, from impermeable to permeable).

To modify a VLAN, do the following:

1. Make the change you want.

2. Click Modify.

# Show Members

Allows you to see all members of the current VLAN in the VLAN membership table.

To see members of the currently selected VLAN, click on the Show Members button. You can also see the VLAN members by double-clicking in the VLAN table.

# Ports

To see the VLAN membership of all ports on a device, click Port.

This brings up a window that allows you to see the VLAN membership of all ports on the device.

# VLAN Table

The VLAN table can show up to 16 VLANs and contains the following information:

VLAN ID (RingswitchLanNum)

VLAN number for which this entry contains virtual LAN details.

VLAN Name (RingswitchLanName)

Name that the administrator has given this VLAN.

VLAN Broadcasts (RingswitchLanPermeable)

Whether the VLAN is permeable or impermeable. In an impermeable group, broadcast frames that were received on a port in the group but were not originated in the group are discarded. In a permeable group, broadcast frames are transmitted on the other ports in the group.

# VLAN Member Table

The VLAN membership table shows the members of the current VLAN and can record up to 64 VLAN members. Below this table are the following buttons for adding and removing cells:

Add

Allows you to add the current cell to this VLAN.

Remove

Allows you to remove the current cell from this VLAN.