SW upgrade pro Catalyst 3550 verze SMI (Layer 2/3 omezeně/4) na verzi EMI (Layer 2/3/4) - IP routing (OSPF, IGRP a EIGRP), inter-VLAN routing, Router access control lists (RACL), Hot Standby Router Protocol (HSRP), Distance Vector Multicast Routing Protocol (DVMRP) a Dynamic Host Configuration Protocol (DHCP).