LI:  Light Image, supports L2 features and static route; maps to Cisco LAN lite

SI: Standard Image, supports L2 features and static route, Dynamic routing RIP, OSPF; maps to Cisco LAN based.

EI: Enhance Image, supports L2 features, static route, RIP, OSPF, BGP; maps to Cisco IP based

HI: High Image,  supports L2 features, static route, RIP, OSPF, BGP, BFD, MPLS, L2VPN, L3VPN; maps to Cisco IP service