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Cisco switch vtp not updating

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By Edward Tetz The VLAN Trunking Protocol (VTP) revision number is important because it determines which updates are to be used when not managed properly this number can cause the deletion of all your networks VLAN information.When you set a VTP Domain Name, the revision number is set to zero, after which each change to the VLAN database increases the revision number by one.A switch is configured to be in only one VTP domain.You make global VLAN configuration changes for the domain by using the Cisco IOS command-line interface (CLI), Cisco Visual Switch Manager Software, or Simple Network Management Protocol (SNMP).I think that I’ve mentioned before that I’ve never used VTP in a production environment before.

If the idea of manually updating all switches within your network doesn't scare you because your network is small, then imagine updating more than 15-20 switches a few times per week, so your network can respond to your organisation's needs...we got you thinking now?What command can I use at a Transparent or Client switch, to identify the VTP Server that is managing the VLANs, that sent the last update. My initial answer was to tell him that there was not way of finding out that information without comparing the VTP status on the client switch (transparent switches don’t use VTP for updates) to the same output on the VTP server switch.Before I responded, I wanted to check out the functionality of the “Local updater ID” in VTP. For those of you who don’t want to read this entire post (and I don’t blame you) here’s the quick and easy answer: By configuring an IP address on your VTP server switches you’ll be able to use the “Local updater ID” (on VTP client and server switches) to see which VTP server last updated the VLAN database via VTP. I have multiple switches connected by trunks, most on the same vtp domain.Two of the switches are VTP Servers – an Agg pair, and the others are either Transparent or clients.I decided to lab up a scenario to answer JB’s question: sw1———-sw2———-sw3———-sw4 server client transparent server CCIE CCIE CCIE CCIE All of the switches are in the VTP domain CCIE.sw1 and sw4 are servers, while sw2 is a client and sw3 is tranparent.The only time that I’ve used VTP server/client is in the lab.I tried to find more information on the “Local updater ID” but came back pretty empty.When a switch receives VTP information from a neighboring switch, the first switch processes data only for the same domain when the revision number is higher than its own.Always check your VTP revision numbers before adding a switch to your network or when adding a switch back to your network.