Switching Via a Bus B bus datagram from input port memory to output port memory via a shared bus bus contention:switching speed limited by bus bandwidth 1 Gbps bus,Cisco 1900:sufficient speed for access and enterprise routers (not regional or backbone) Network Layer 4-25 Network Layer 4-25 Switching Via a Bus  datagram from input port memory to output port memory via a shared bus  bus contention: switching speed limited by bus bandwidth  1 Gbps bus, Cisco 1900: sufficient speed for access and enterprise routers (not regional or backbone)