Product Description Cisco Supervisor Engine 720 with PFC3B - control processor Features: Layer 3 switching, Layer 2 switching, MPLS support, IGMP snooping, IPv6 support Dimensions (WxDxH) 37.9 cm x 40.3 cm x 4 cm RAM Installed (Max) 512 MB (1 GB) OS Required Cisco IOS 12.2(17d)SXB1 Device Type Control processor Enclosure Type Plug-in module Data Link Protocol Ethernet, Fast Ethernet, Gigabit Ethernet Flash Memory Installed (Max) 64 MB Flash.