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OSPF offers some advantages over traditional vector-space routing protocols (such as RIP).
The following table summarizes some of the major differences between OSPF and RIP.
Table 117 OSPF vs. RIP
Network Size
Metrics
Convergence
19.8.1 OSPF Autonomous Systems and Areas
An OSPF autonomous system can be divided into logical areas. Each area represents a group
of adjacent networks. All areas are connected to a backbone (also known as area 0). The
backbone is the transit area to route packets between two areas. A stub area, at the edge of an
AS, is not a transit area since there is only one connection to the stub area.
19.8.2 Interfaces and Virtual Links
An OSPF interface is a link between a layer 3 device and an OSPF network. An interface has
state information, an IP address and subnet mask associated with it. When you configure an
OSPF interface, you first set an interface to transmit OSPF traffic and add the interface to an
area.
You can configure a virtual link to establish/maintain connectivity between a non-backbone
area and the backbone. The virtual ink must be configured on both layer 3 devices in the non-
backbone area and the backbone.
19.8.3 Configuring Basic OSPF Settings
Follow the steps below to activate OSPF and configure basic settings.
1 In the Device Panel list, right-click on a device.
2 Click Configuration > IP Configuration > OSPF.
NetAtlas Workgroup User's Guide
OSPF
Large
Bandwidth, hop count, throughput, round
trip time and reliability.
Fast
Chapter 19 IP Configuration
RIP
Small (with up to 15 routers)
Hop count
Slow
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