3Com 3CBLUG16A User Guide - Page 34
Creating a VLAN - specifications
UPC - 662705544489
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34 CHAPTER 4: CONFIGURING THE SWITCH VLAN serves as a logical workgroup with no physical barriers, and allows users to share information and resources as though located on the same LAN. You can use the Switch to create VLANs to organize any group of ports into separate broadcast domains. VLANs confine broadcast traffic to the originating group and help eliminate broadcast storms in large networks. This also provides for a more secure and cleaner network environment. Using the Switch, you can create up to 64 VLANs, add specific ports to a chosen VLAN (so that the port can only communicate with other ports on the VLAN), or configure a port make it a member of all VLANs. 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 VLANs page 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. Figure 14 VLANs Page Ports belonging to a VLAN must be set to either U (uplink) or D (desktop). Desktop VLAN ports can only be members of one VLAN at any time. Setting a port as an uplink (tagged) VLAN port forwards all VLAN traffic from the other ports on the Switch to this port. Use the uplink port function to connect the Switch to the backbone of the network. Traffic from all the VLANs on the switch is automatically forwarded to the uplink port or ports. By default, all ports belong to VLAN 1. CAUTION: At least one port must always be a 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