Avaya Configuring IP, ARP, RIP, and OSPF Services Bedienungsanleitung PDF herunterladen (Seite 30)

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Configuring IP, ARP, RIP, and OSPF Services

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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. CIDR reduces the size of the routing tables used to store

advertised IP routes.

OSPF supports classless routing within a domain.

Autonomous Systems

LANs and WANs interconnected by IP routers form a group of networks called an

internetwork. For administrative purposes, an internetwork is divided into

autonomous systems. An autonomous system (AS) is simply a collection of

routers (called gateways in IP terminology) and hosts. Figure 1-3

depicts a sample

internetwork segmented into three autonomous systems.

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