посмотри на флэшке есть файл vlan.dat?
есть свободное место?
какой иос?
попробовал на новой 2811примерно так
Router>enable
Router#vlan database
% Warning: It is recommended to configure VLAN from config mode,
as VLAN database mode is being deprecated. Please consult user
documentation for configuring VTP/VLAN in config mode.
Router(vlan)#vlan 2 name lala
VLAN 2 modified:
Name: lala
Router(vlan)#vlan 3
VLAN 3 added:
Name: VLAN0003
Router(vlan)#exit
APPLY completed.
Exiting....
Router#wri
Destination filename [startup-config]?
Building configuration...
[OK]
Router#sh run
Building configuration...
Current configuration : 332 bytes
!
version 12.3
no service password-encryption
!
hostname Router
!
!
!
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
ip classless
!
!
!
!
line con 0
line vty 0 4
login
!
!
end
Router#
Router#
Router#
Router#
Router#
Router#sh vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
2 lala active
3 VLAN0003 active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
2 enet 100002 1500 - - - - - 0 0
3 enet 100003 1500 - - - - - 0 0
1002 enet 101002 1500 - - - - - 0 0
1003 enet 101003 1500 - - - - - 0 0
1004 enet 101004 1500 - - - - - 0 0
1005 enet 101005 1500 - - - - - 0 0
Router#dir
Directory of flash:/
1 -rw- 5571584 <no date> c2800nm-ipbase-mz.123-14.T7.bin
2 -rw- 676 <no date> vlan.dat
32514048 bytes total (26941788 bytes free)
Router#