itches in the VTP domain. When this is the case, you'll need the relevant commands for IOS and CatOS. There are three VTP modes on an IOS-based switch: server, client, and transparent. They are set using the vtp mode command: 3550-IOS (config)# vtp mode client Set the device to client mode. server Set the device to server mode. transparent Set the device to transparent mode. Setting a switch to the mode already in use results in an error message: 50-IOS(config)# vtp mode server Device mode already VTP SERVER. Changing the VTP mode results in a simple message showing your change: 3550-I0S(config)# vtp mode transparent Setting device to VTP TRANSPARENT mode. CatOS CatOS has an additional mode: off. This mode is similar to transparent mode, in that advertisements are ignored, but they are not forwarded as they would be using transparent. The modes are set using the set vtp mode command: Switch1-CatOS# (enable) set vtp mode ? client VTP client mode VTP off server VTP server mode transparent VTP transparent mode Changing the VTP mode on a CatOS switch results in a status message indicating that the VTP domain has been modified: Switch1-Catos# (enable) set vtp mode transparent Changing VTP mode for all features VTP domain GAD-Lab - modified Chapter 6: VLAN Trunking Protocol Unlike with IOS, setting the mode to the mode already in use does not result in an error message. VTP Password Setting a VTP password ensures that only switches configured with the same VTP password will be affected by VTP advertisements. In IOS, you can set a password for VTP with the vtp password command: 3550-IOS (config)# vtp password MilkBottle Setting device VLAN database password to MilkBottle There is no option to encrypt the password, but the password is not displayed in the configuration. To show the password, execute the show vtp password command from the enable prompt: 3550-IOS# sho vtp password VTP Password: MilkBottle To remove the VTP password, negate the command: 3550-I0S(config)# no vtp password Clearing device VLAN database passwor