当配置多个vlan时候，在键入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 s queeze...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。