Per slot license enables limited per-vlan-queuing on 16X10G MPC,MPC6E,MPC4E and MPC3E (only for 10G, 40G and 100G ports);Per slot license for enabling 32K total queues on non-Q MPCs MPC5E-100G10G, MPC5E-40G10G, MPC2E-3D-NG and MPC3E-3D-NG
License, per slot, to support full scale L3 route and L3 VPN features on MPC4E. This license only allows upgrade from IR mode. To upgrade a base SKU to -R mode two licenses have to be purchased - one -IR and one -R license