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Configuring IP Services
1-8 114065 Rev. A
Classless Interdomain Routing
Classless interdomain routing (CIDR) is an addressing scheme that employs
supernet addresses to represent multiple IP destinations. Rather than advertise a
separate route for each destination in a supernet, a router can use a supernet
address to advertise a single route -- called an aggregate route -- that represents all
of the destinations. This reduces the size of the routing tables used to store
advertised IP routes.
BGP-4 supports classless interdomain routing. OSPF supports classless routing
within a domain.
Autonomous Systems
LANs and WANs interconnected by IP routers form a group of networks called an
internet. For administrative purposes, an internet is divided into autonomous
systems. An autonomous system (AS) is simply a collection of routers (called
gateways in IP terminology) and hosts. Figure 1-2 depicts a sample internet
segmented into three autonomous systems.
Routing Protocols
Routers inside an autonomous system use an interior gateway protocol to
communicate network topology changes to each other. Routers in separate
autonomous systems use an exterior gateway protocol to communicate. The IP
router implements two dynamic interior protocols: RIP and OSPF. The IP router
implements two exterior protocols: BGP and EGP.
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