Netgear GSM7328Sv1 7000 Series Managed Switch Administration Guide for Softwar - Page 95
OSPF, Con an Inter-Area Router, OSPF
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Chapter 9 OSPF In this chapter, the following examples are provided: • "Configure an Inter-Area Router" on page 9-1 • "Configure OSPF on a Border Router" on page 9-8 • "Configure Area 1 as a Stub Area" on page 9-16 • "Configure Area 1 as a nssa Area" on page 9-26 • "VLAN Routing OSPF Configuration" on page 9-37 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 and/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 7000 Series Managed Switch operating as a router and running OSPF will determine 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 Configure an Inter-Area Router The examples in this section show you how to configure a 7000 Series Managed 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. 9-1 v1.0, November 2008