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Note that VTP was especially useful when first introduced since configuring VLAN over Token Ring and FDDI interfaces was complex, and it took many years for network administrators to understand VLAN configuration.Importantly, VTP was useful to help stabilise Spanning Tree in the early days by ensuring consistentcy, especially in large networks (well, they were large in 1999 anyway….). I change port F0/47 to switchport access vlan B (routable vlan) but can't get a DHCP address.

VTP is a Layer 2 messaging protocol that maintains VLAN configuration consistency by managing the addition, deletion, and renaming of VLANs on a network-wide basis.If VTP is not updating the VLANs correctly, check to make sure the MD5 digest on all VTP domain switches is the same.The MD5 digest is calculated using the revision number, domain name, and password to make sure the information in the VTP update can be trusted.It’s a common discussion about when Cisco VTP protocol is actually forwarded through Cisco switches and when it’s isn’t.I’ve always gotten it somewhat confused and when I stumbled across some old notes on the topic I had an ah-hah moment.

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