VLAN Trunking Protocol (VTP) is a Cisco proprietary Layer 2 messaging protocol that manages VLAN configuration consistency across a network. It allows a network administrator to configure VLAN information on one switch, which then propagates that information to other switches in the VTP domain. This simplifies VLAN management and reduces the risk of configuration inconsistencies that can lead to network connectivity issues. VTP operates in different modes, including server, client, and transparent, each with specific roles in VLAN configuration propagation.
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