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This VLAN database is in the form of a separate file in NVRAM called the vlan.dat file. For this, a VLAN database was introduced to Cisco IOS software for Catalyst switches as a method to immediately save VTP updates for VTP clients and servers. The VTP update requirements are met by the default CatOS operation, but the Cisco IOS software update model requires an alternative update operation. VTP client and server systems require VTP updates from other VTP servers to be immediately saved in NVRAM without user intervention. In contrast, Cisco IOS software does not save configuration changes to NVRAM unless you issue the copy run start command. VLAN or VTP configuration changes in CatOS are written to NVRAM immediately after a change is made. Refer to Cisco Technical Tips Conventions for more information on document conventions. This document can also be used with these hardware and software versions:Ĭisco Catalyst 6000, 4500, 4000 series switches that run Cisco IOSĬisco Catalyst 3750, 3750E, 3560, 3560E, 3550, 2970, 2960, 2955, 2950, and 2940 series switches

If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on these software and hardware versions:Ĭisco Catalyst 6500 switch that runs Cisco IOS Software Release 12.1(26)E1Ĭisco Catalyst 2950 switch that runs Cisco IOS Software Release 12.1(22)EA9 This document is not restricted to specific software and hardware versions. Understand how Cisco Catalyst switches work Prerequisites RequirementsĬisco recommends that you have knowledge of this topic: This document discusses the purpose of this file, and ways to manage the file. Cisco Catalyst switches that run Cisco IOS ® software releases maintain the VLAN information in a special file named vlan.dat.