Packet switches engine Switch Scheduler Packet DataReader→[ Packet Tag DestinationAddress Output port number or vc number a packet switch consists of a routing engine(table look-up),a switch scheduler and a switch fabric The routing engine looks-up the packet address in a routing table and determines which output port to send the packet Packet is tagged with port number The switch uses the tag to send the packet to the proper output portPacket switches Packet Routing engine Switch Scheduler Packet Data Header Packet Tag DestinationAddress Output port number or VC number • A packet switch consists of a routing engine (table look-up), a switch scheduler, and a switch fabric. • The routing engine looks-up the packet address in a routing table and determines which output port to send the packet. – Packet is tagged with port number – The switch uses the tag to send the packet to the proper output port Eytan Modiano Slide 2