By default, the system reserves VLAN IDs 4060 to 4094 for internal use.
If you enable both the VRF scaling and the SPBM mode boot configuration flags, the system reserves additional VLAN IDs (3500 to 3998) for internal use.
By default, VRF scaling is disabled and SPBM mode is enabled. When VRF scaling is disabled, you can have a maximum of 24 VRFs.