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How to configure extended range VLANs in Catalyst 6500 switch running Cisco IOS software
You must enable the extended system ID to use extended range VLANs. Chassis that support only 64 MAC addresses always use the 12-bit extended system ID. On chassis that support 1024 MAC addresses, you can enable use of the extended system ID. STP uses the VLAN ID as the extended system ID.
Note: You cannot disable the extended system ID on chassis that support 64 MAC addresses or when you have configured extended range VLANs
Complete these steps in order to configure extended range VLAN:
Extended range VLAN must be created in the configuration mode and not from the vlan database mode.
Enable the extended-system ID feature on chassis that support 1024 MAC addresses: