Cisco WS-C4003 Software Guide - Page 169

Chapter 10 Configuring VLANs Configuring Private VLANs This example shows how to clear all 802.1Q-to-ISL VLAN mappings: Console> (enable) clear vlan mapping dot1q all All vlan mapping entries deleted Console> (enable) Deleting a VLAN When you delete a VLAN in VTP server mode, the VLAN is removed from all switches in the VTP domain. When you delete a VLAN in VTP transparent mode, the VLAN is deleted only on the current switch. When you are on a VTP client, you can only delete a VLAN on the local switch. Caution When you delete a VLAN, any ports assigned to that VLAN become inactive. Such ports remain associated with the VLAN (and thus inactive) until you assign them to a new VLAN. To delete a VLAN on the switch, perform this task in privileged mode: Task Delete a VLAN. Command clear vlan vlan_num This example shows how to delete a VLAN (in this case, the switch is a VTP server): Console> (enable) clear vlan 500 This command will deactivate all ports on vlan 500 in the entire management domain Do you want to continue(y/n) [n]?y Vlan 500 deleted Console> (enable) Configuring Private VLANs These sections describe how private VLANs work: • Understanding How Private VLANs Work, page 10-7 • Private VLAN Configuration Guidelines, page 10-9 • Creating a Private VLAN, page 10-10 • Viewing the Port Capability of a Private VLAN Port, page 10-13 • Deleting a Private VLAN, page 10-13 • Deleting an Isolated or Community VLAN, page 10-14 • Deleting a Private VLAN Mapping, page 10-14 Understanding How Private VLANs Work A private VLAN is a VLAN you configure to have some Layer 2 isolation from other ports within the same private VLAN. Ports belonging to a private VLAN are associated with a common set of supporting VLANs that are used to create the private VLAN structure. You can configure private VLANs and normal VLANs from the same Catalyst 4000 family switch. 78-12647-02 Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 10-7