VLAN Trunking Protocol
In Figure 4-4, two VLANs extend over multiple switches using trunking. Because each switch sharing trunks must support common VLAN information for the trunks to function correctly, Cisco created the VLAN Trunking Protocol (VTP) for creating and managing that VLAN information. It should be noted that any VLAN created on a switch is in an inactive state until VTP is configured.
A collection of switches that are under the same administrative control and will support the same range of configured VLANs are said to be in the same VTP domain. A domain name is simply a unique identifier up to 32 characters long used to identify the switches that will share the same VTP information. The domain name is also case sensitive.
VTP packets ...
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