VTP VLAN configuration not allowed when device is not the primary server for vlan database.

VTP VLAN configuration not allowed when device is not the primary server for vlan database.
Вот таким сообщением озадачила меня только что cisco 3560. Боремся с этим очень просто:

- Причина проблемы:

Switch1(config)#do show vtp status
VTP Version capable             : 1 to 3
VTP version running             : 3
VTP Domain Name                 : Univer
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Disabled
Device ID                       : 0016.9d70.f080

Feature VLAN:
--------------
VTP Operating Mode                : Server
Number of existing VLANs          : 81
Number of existing extended VLANs : 0
Configuration Revision            : 0
Primary ID                        : 0000.0000.0000 <--- ВОТ ТУТ!!!!
Primary Description               :
MD5 digest                        : 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
                                    0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00

- Решение:

Switch1#vtp primary
This system is becoming primary server for feature vlan
No conflicting VTP3 devices found.
Do you want to continue? [confirm]
Switch1# show vtp status
VTP Version capable             : 1 to 3
VTP version running             : 3
VTP Domain Name                 : Univer
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Disabled
Device ID                       : 0016.9d70.f080

Feature VLAN:
--------------
VTP Operating Mode                : Primary Server
Number of existing VLANs          : 81
Number of existing extended VLANs : 0
Configuration Revision            : 1
Primary ID                        : 0016.9d70.f080
Primary Description               : Switch1
MD5 digest                        : 0xFC 0xB9 0x62 0x30 0xE7 0x46 0xD5 0x96
                                    0x3D 0x28 0x2E 0x85 0xFC 0x4E 0xBB 0x63
 

Теперь на каталисте снова можно создавать вланы!