VTP is Cisco proprietary protocol and abbreviation for VLAN Trunking Protocol. It propagates VLAN info all through a community. VTP reduces administration in a switched community. After we configure a brand new VLAN on one VTP server, the VLAN is distributed by way of all switches within the area. This reduces the necessity to configure the identical VLAN in every single place.
Understanding the idea: VTP Bomb
Now let’s perceive how VTP may be catastrophe in a community – however earlier than that it’s crucial to know that Swap with greater VTP revision quantity within the LAN will trigger VLAN info to be overwritten in all switches. This occurs since it’s thought of that newest VLAN info is accessible with swap which has highest VTP revision quantity.
It may occur any individual would disconnect a swap from a manufacturing LAN surroundings, make a take a look at lab on it by deleting/altering VLANs after which reconnecting the identical swap again to the LAN. In that case the revision quantity would get elevated and VLANs can be deleted/modified from all switches that are in LAN.
Now, the whole community successfully “dies” and this time period is called a “VTP Bomb” the place a swap with greater revision quantity creates havoc in community by propagating incorrect database to the area and the overwriting the secure database.
What’s the decision?
VTP Model 3 (VTPv3) which was launched in Cisco NX-OS launch 7.2(0) has the decision to the problem of VTP bombing.
With VTP model 3, solely a swap could be a main server which is allowed to replace different units in LAN. Secondary servers will replace its database from the Major completely. This resolves the problem confronted in VTP bombing in VTP model 1 and a pair of.
Proceed Studying:
VTP Modes and Variations: VTP v1, VTP v2 and VTP v3
