Having the following output message while trying to create a VLan outside higher than 1000 on your Cisco device?
SWITCH-601(config)#vlan 2991 SWITCH-601(config-vlan)#end % Failed to create VLANs 2991 Extended VLAN(s) not allowed in current VTP mode. %Failed to commit extended VLAN(s) changes.
This mean that you are running VTP mode 1 or 2, which only support VLan range between 1 – 1000. To be able to create anything outside of that scope, you need to run VTP in transparent mode.
You can verify the current VTP status issuing the following command :
show vtp status
Output example :
SWITCH-601#sh vtp status VTP Version : running VTP1 (VTP2 capable) Configuration Revision : 19 Maximum VLANs supported locally : 1005 Number of existing VLANs : 507 VTP Operating Mode : Server VTP Domain Name : VTP Pruning Mode : Disabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0xF8 0x43 0xD4 0x72 0xA0 0x4F 0xAB 0xA0 Configuration last modified by 192.168.5.1 at 9-8-15 19:01:28 Local updater ID is 192.168.5.1 on interface Vl2 (lowest numbered VLAN interface found)
If you do not require VTP at all, simply put this setting to “transparent mode” as followed :
vtp mode transparent
Output example :
SWITCH-601(config)#vtp mode transparent Setting device to VTP TRANSPARENT mode.
You may now create the VLan and write changes to memory.