Catalyst IOS stores VLAN and VTP configuration in one of two places—either in a Flash file
called vlan.dat or in the running configuration. (Remember that the term “Catalyst IOS” refers to
a switch that uses IOS, not the Catalyst OS, which is often called CatOS.) IOS chooses the storage
location in part based on the VTP mode, and in part based on whether the VLANs are normal range
VLANs or extended-range VLANs. Table 2-6 describes what happens based on what
configuration mode is used to configure the VLANs, the VTP mode, and the VLAN range. (Note
that VTP clients also store the VLAN configuration in vlan.dat, and they do not understand extended range VLANs.)
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