Where are VLAN/VTP Configs Stored?

Answered Question
May 29th, 2009


I'm working on the ICND2, and came across an interesting conflict.

The author of one text claims that VTP Configs are stored in RAM (for Clients) and NVRAM for Servers and Transparents.

Odom, on the other hand, states that VTP Servers and Clients store the config in flash, and Transparents store their configs in flash and the running-config.

Anyone know which is correct? TIA.


I have this problem too.
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Correct Answer by crow930us about 7 years 4 months ago

Here is the full document.


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Overall Rating: 4 (1 ratings)
crow930us Sat, 05/30/2009 - 16:09

VLAN or VTP configuration changes in CatOS are written to NVRAM immediately after a change is made. In contrast, Cisco IOS software does not save configuration changes to NVRAM unless you issue the copy run start command.

VTP client and server systems require VTP updates from other VTP servers to be immediately saved in NVRAM without user intervention. The VTP update requirements are met by the default CatOS operation, but the Cisco IOS software update model requires an alternative update operation. 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. This VLAN database is in the form of a separate file in NVRAM called the vlan.dat file.


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