Routing Basics (1)
Routing - act of moving information across a network from source to destination; routing occurs at Layer 3 of OSI RM; routing became popular in mid-1980s
Routing components
- Path determination (very complex)
- Packet transportation (referred to as switching)
Path determination
- routers maintain routing tables
- routing algorithms fill routing tables (metric: cost, load, bandwidth, reliability, path length , hop count)
- routing update messages