3Com TR manual Assigning a Port to a Vlan, Specifying a Backbone Port

■ATM—The port is an ATM OC-3c Module port. For more information, see the SuperStack II Switch ATM OC-3c Module User Guide.

■VLAN Membership—This field displays the ID of the VLAN(s) to which the port belongs.

■Port ID—This field displays the ID of the port currently selected in the listbox.

■VLAN ID—This field allows you to enter the ID of the VLAN to which the port is assigned. All ports by default belong to VLAN 1.

Backbone Port—If the port specified in the Port ID field uses Port VLAN Mode, this field allows you to specify whether the port is a backbone port. Any port in a VLAN can be designated as the backbone port for that VLAN, but you can only have one backbone port per VLAN. By default, all ports belong to the Default VLAN (VLAN 1). Because of this, an unconfigured Switch unit can only have one backbone port.

If you specify that an ATM OC-3c Module port is a backbone port, the port becomes a backbone port for all the VLANs on which it is active. It cannot be the backbone port for one VLAN and a standard port for another.

NOTE: If you fit a Plug-in Module into a Switch with no specified backbone ports, the Module automati- cally becomes the backbone port for the Default VLAN when you power up or initialize the Switch. If a Switch has no Plug-in Module, the high speed cas- cade interface becomes the backbone port for the Default VLAN when you power up or initialize the Switch.

VLAN Configuration 4-13

APPLY—This button applies any changes to the VLAN database.

VLAN LEC Setup—If the port is an ATM OC-3c Module port, this button allows you access the VLAN LEC Setup screen for extending your VLANs into an ATM network. For more information, see the Super- Stack II Switch ATM OC-3c Module User Guide.

Assigning a Port to a VLAN

1In the Port ID field, type the ID of the required port.

2In the VLAN ID field, type the ID of the required VLAN.

3Select APPLY.

CAUTION: Initially, all Switch ports belong to the Default VLAN (VLAN 1). This VLAN is the only VLAN which allows an SNMP Network Manager to access the management agent of the unit. If you remove all ports from VLAN 1, then an SNMP Network Manager cannot manage the Switch.

Specifying a Backbone Port

1In the Port ID field, type the ID of the required port.

2In the VLAN ID field, type the ID of the required VLAN.

3In the Select Port Type field, select Backbone Port.

4Select APPLY.