switches. Version 1 is the default VTP version on all switches and is typically
used. No VTP version configuration is needed if you will be running version
1. Version 1 and version 2 are not compatible, so it is an all-or-nothing con-
figuration for your switches. However, if all of your switches are VTP ver-
sion 2 compatible, changing one switch changes all of them. Be careful if you
are not sure if all of your switches are version 2 compatible.
version 2 of the VTP protocol. This means that all switches must be capa-
ble of running version 2.
advertisement is received and has an unrecognized type-length-value, the
version 2 VTP switches will still propagate the changes through their
trunk links.
that they will only forward messages and advertisements, not add them to
their own database. In version 1, the switch will check the domain name
and version before forwarding, but in version 2, the switches will forward
VTP messages without checking the version.
enters new information in the switches, either with the CLI or other man-
agement software. If information is received by an advertisement or read
from NVRAM, a consistency check is not run. A switch will check the
digest on a VTP message, and if it is correct, no consistency check will
be made.