Supervisor Engines I and II have the following features: Bridge address table for up to 16, 000 active Media Access Control (MAC) addresses and associated VLANs allocated dynamically between active ports; Switching engine that provides data path and control for all network interfaces including two integrated Fast Ethernet interfaces that can support redundancy using the spanning-tree algorithm or load sharing when used with VLANs; Fast Ethernet interfaces using RJ-45 media-dependent interface crossed-over (MDIX) and media-independent interface (MII) connectors, Fast Ethernet multimode fiber (MMF), or single-mode fiber (SMF) interfaces using SC connectors; Management functions that include monitoring the interface and environmental status and providing Simple Network Management Protocol (SNMP) management and the console/Telnet interface; 25-MHz Motorola MC68EC040 Network Management Processor (NMP); Switch fabric interface with a capability of over one million packets per second (pps); Hardware support for up to 1024 VLANs.The following features are available on Supervisor Engine II only: Redundant supervisor engines and clock modules; Modular feature card for core switching logic.