Extended-range VLANs cannot be created in the 1006 to 4094 range from the VLAN database mode. But, the Cisco Catalyst switch allows the creation of extended-range VLANs from the config-vlan mode.
VLAN Trunking Protocol (VTP)only learns normal-range VLANs, with VLAN IDs 1 to 1005; VLAN IDs greater than 1005 are extended-range VLANs and are not stored in the VLAN database, and hencen not carried over on the VTP.
The config-vlan mode must always be used to configure extended-range VLANs. Issue the vlan vlan-id global configuration command in order to access this mode.
In order to enter the VLAN database mode, issue the vlan database privileged EXEC command. But, the extended VLAN range is not supported in VLAN database mode.
Note: The 2900XL and 3500XL can use only VLANs 1 to 1001 and they do not support extended range VLANs. If you upgrade the software of the switch, it does not bring an enhancement to support the configuration of extended range VLANs.