Netgear M4300-24X24F (XSM4348S) - Stackable Managed Switch with 48x10G including 24x10GBASE-T and 24xSFP+ Layer 3 Guia Do Administrador

For larger networks, Open Shortest Path First (OSPF) is generally used in preference to RIP. 
OSPF offers several benefits to the administrator of a large or complex network:

Less network traffic:

Routing table updates are sent only when a change has occurred.

Only the part of the table which has changed is sent.

Updates are sent to a multicast, not a broadcast, address.

Hierarchical management, allowing the network to be subdivided.

The top level of the hierarchy of an OSPF network is known as an autonomous system (AS) 
or routing domain, and is a collection of networks with a common administration and routing 
strategy. The AS is divided into areas: Intra-area routing is used when a source and 
destination address are in the same area, and inter-area routing across an OSPF backbone 
is used when they are not. An inter-area router communicates with border routers in each of 
the areas to which it provides connectivity.

The switch operating as a router and running OSPF determines the best route using the 
assigned cost and the type of the OSPF route. The order for choosing a route if more than 
one type of route exists is as follows:

Intra-area.

Inter-area.

External type 1: The route is external to the AS.

External type 2: The route was learned from other protocols such as RIP.

The examples in this section show you how to configure the switch first as an inter-area 
router and then as a border router. They show two areas, each with its own border router 
connected to one inter-area router.

The following figure shows a network segment with an inter-area router connecting areas 
0.0.0.2 and 0.0.0.3. The sample script shows the commands used to configure the switch as 
the inter-area router in the diagram by enabling OSPF on port 1/0/2 in area 0.0.0.2 and port 
1/0/3 in area 0.0.0.3.