3Com 2848 SFP User Guide - Page 34

34 CONFIGURING THE SWITCH Communication between different VLANs can only take place if they are all connected to a router or layer 3 switch. Creating a VLAN Use the Create VLANs screen to create VLANs on the Switch. To propagate information about VLAN groups used on this Switch to external devices, you must specify a VLAN ID for each VLAN. 1 In VLAN ID, choose "Create New VLAN" from the drop down menu. Figure 13 Create VLANs Screen ■ VLAN ID - ID of configured VLAN (1-4094, no leading zeroes). For examples on setting up VLANs, refer to "Sample VLAN Configurations" on page 35. CAUTION: At least one port must always be an untagged member of VLAN 1 (the management VLAN). If you choose to connect all ports to VLANs other than VLAN 1, you will no longer be able to access the Web interface. If this happens, you will need to reset the Switch to factory settings. By default, all ports belong to VLAN 1 as an untagged member. Also, newly created VLANs will initially have no ports associated with them. Each port will always belong to either VLAN 0 or 1 as an untagged member. However, they can belong to multiple VLANs as a tagged member. Modify VLANs Click the icon under each port number to configure the port mode of a selected VLAN. To change the mode of all ports, click the icon under "All". Available options for each port include (only one option can be associated with a single port): ■ N - Not a member. If you select this, the port is not a member of the currently selected VLAN. ■ T - Tagged. If you select this, the port is able to communicate with all VLANs on the Switch. ■ U - Untagged. If you select this, the port can only communicate with other ports assigned to the same VLAN selected in the VLAN ID drop down list.