In this article, we are going to explain all the secrets to avoid that and use it safely.
This article explains you how VTP works, and then teaches you the configuration with a lab.
You will be able to try what you learn in this emulated network.
The documentation clearly states that in VTP version 2 a switch in transparent mode will not inspect the domain name, but we can see from this test that it does appear to inspect the domain name and does not pass along messages that do not match its configured domain name. I will configure the same domain name on SW2, but leave it in transparent mode. Before you start configuring something in production or on a lab exam, be sure you know how it really works.
If you get a CCNA job, it is likely that you will manage a lot of switches.
We don’t expect to see them on SW2 because it is in transparent mode, but SW2 should pass them on to SW3. So, the only thing we changed was to make the VTP domain name to match on SW2, which remained in VTP transparent mode.
However, neither does SW3 does have the new VLANs, nor has its VTP revision number changed. While documentation is good, it is not always completely accurate.
If converting from VTP version 3 to VTP version 2, VLANs in the range 1006 to 4094 are removed from VTP control.
Reference: Pruning makes more efficient use of trunk bandwidth by forwarding broadcast and unknown unicast frames on a VLAN only if the switch on the receiving end of the trunk has ports in that VLAN.However, this is possible only on Trunks: two switches connected with an access link won’t sync. This is where the revision number starts to play a key role. The higher the revision number, the most up-to-date the database.Therefore, the two switches will check each other’s revision number, and the one with the higher one will push the database to the other.As a result, for our lab we are going to use only switches.Below, a picture of the five switches interconnected in our lab. Since we are working with VTP, our major goal is to configure VLANs on the top switch and propagate them to the others.Cisco designed the VLAN Trunk Protocol for switches.