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VLAN Routing OSPF Configuration
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
OSPF
NETGEAR 7000 Series Managed Switch Administration Guide Version 7.3
v1.0, November 2008
9-37
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