当配置多个vlan时候，在鍵入exit或apply时候经常会出现下面的出错信息，使得无法创建新的vlan

SW1(vlan)#exit

% not enough space on flash to store vlan database. trying squeeze...First create squeeze log by erasing the entire device

% error squeezing flash - (Missing Ｏr corrupted log)

Error on database apply 40: NV storage failure

Use 'abort' command to exit

SW1(vlan)#

sw1#erase flash:

Erasing the flash filesystem will remove all files! Continue? [confirm]

Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ...erased

Erase of flash: complete

解决办法:出现错误时候，鍵入abort先退到特权模式，然后打入erase flash，点确定完，再进入vlan database配置vlan即可。