1MB/S=8Mbps 1byte = 8bit networking layer:
transport segment
two function:forwarding(move packet) and
routing(determine route taken by packets
data plane:forwarding function;hardware; control
plane:routing algorithm/software defined
networking;software
inout ports:decentralized switching:lookup output oort
using forwarding table in input port;line
speed;queueing;destination-based
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1MB/S=8Mbps 1byte = 8bit networking layer:
transport segment
two function:forwarding(move packet) and
routing(determine route taken by packets
data plane:forwarding function;hardware; control
plane:routing algorithm/software defined
networking;software
inout ports:decentralized switching:lookup output oort
using forwarding table in input port;line
speed;queueing;destination-based forwarding:forward
based only in destination ip
address(traditional);generalized forwarding:based on
any set of header field values
input:line termination->link layer protrol->lookup
forwarding queueing- >switch fabric
longest prefix matching:often performed using ternary
content addessable memories(TCAMs)
switching fabrics:transfer packet from input buffer to
appropriate output buffer switching via memory/bus/
interconnection network
memory:first generation router:control of cpu;copy
system's memory;speed limited bu memory bandwidth
bus:bus contention:speed limited by bus bandwidth;32
Gbps bus, Cisco 5600: sufficient speed for access and
enterprise routers
inter net:overcome bus bandwidth limitation;connect
processors in multiprocessor;advanced:fragmenting
datagram into fixed length cells, switch cells through the
fabric; Cisco 12000: switches 60 Gbps through the
interconnection network
fabric slower than input ports combined -> queueing
may occur at input queues;queueing delay
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