ends that the VLAN Trunking Protocol (VTP) be config- ured as a first step when configuring VLANs. This idea has merit, as trunks will not negotiate without a VTP domain. However, setting VTP domain is not required to make VLANs function on a single switch. Configuring VTP is covered later (see Chapter 5 and Chapter 6). CatOS For CatOS, creating a VLAN is accomplished with the set vlan command: Switch1-Catos# (enable) set vlan 10 name Lab-VLAN VTP advertisements transmitting temporarily stopped, and will resume after the command finishes. Vlan 10 configuration successful There are a lot of options when creating a VLAN, but for the bare minimum, this is all that's needed. To show the status of the VLANs, execute the show vlan command: Switch1-CatOS# (enable) sho vlan VLAN Name Status IfIndex Mod/Ports, Vlans default active 1/1-2 2/1-2 3/5-48 6/1-48 Lab-VLAN active VLAN0020 active 3/1-4 1002 fddi-default active 1003 token-ring-default active 1004 fddinet-default active 1005 trnet-default active 1006 Online Diagnostic Vlan1 active internal 1007 Online Diagnostic Vlan2 active internal 1008 Online Diagnostic Vlan3 active internal 1009 Voice Internal Vlan active internal 1010 Dtp Vlan active internal 1011 Private Vlan Reserved Vlan suspend internal 1016 Online SP-RP Ping Vlan active internal Notice that VLAN 10 has the name you assigned; VLAN 20's name, which you did not assign, defaulted to VLAN0020. The output shows which ports are assigned to VLAN 20, and that most of the ports still reside in VLAN 1. (Because VLAN 1 is the default VLAN, all ports reside there by default.) There are no ports in VLAN 10 yet, SO add some, again using the set vlan command: Chapter 4: VLANs Switch1-CatOS# (enable) set vlan 10 6/1,6/3-4 VLAN 10 modified. VLAN 1 modified. VLAN Mod/Ports 10 6/1,6/3-4 You've now added ports 6/1, 6/3, and 6/4 to VLAN 10. A show vlan will reflect these changes: Switch1-Catos# (enable) sho vlan VLAN Name Status IfIndex Mod/Ports, Vlans default active 1/1-2 2/1-2 3/5-48 6/2,6/5-48 Lab-VLAN active 6/1,6/3-4 VLAN