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Chapter 7. Cisco Security General > VLAN Trunking Protocol Security

VLAN Trunking Protocol Security

The VLAN Trunking Protocol (VTP) is a Layer 2 messaging protocol that enables administrators to centrally manage the addition, deletion, and renaming of VLANs. VTP is typically configured as a domain (also called a VTP management domain) composed of one or more interconnected switches, where switches share the VTP management domain name. Changes to the VTP domain can be made either through the CLI or SNMP and are propagated to member switches through VTP advertisements. If a switch receives a VTP advertisement over a trunk link and it is not configured to be a transparent switch, it inherits the VTP domain name and configuration-revision number. VTP security is provided through a password that is entered into the VTP database on all the switches. This shared password authenticates VTP advertisements and is configured in CatOS by using the command set vtp password password and, in Cisco IOS Software, by using the command vtp password password.


  

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