Compatible Systems 5.4 - Manual (Page 261)

Chapter 15 - OSPF 255
Chapter 15 - OSPF
This chapter provides instructions for configuring a network utilizing the
OSPF (Open Shortest Path First) Protocol. OSPF uses a link-state algorithm
in order to build and calculate the shortest path to all known destinations.
Each router in an OSPF area contains an identical link-state database, which
is a list of each router’s usable interfaces and reachable neighbors.
Unlike RIP updates, OSPF link-state database updates are only sent when
routing changes occur, instead of periodically, and the link-state database is
updated instantly, rather than gradually, as stale information is timed out.
OSPF routing decisions are based on “cost” which is an indication of the
overhead required to send packets across a certain interface. The cost of an
interface is calculated based on link bandwidth rather than the number of hops
to the destination. The cost can also be configured to specify preferred paths.
OSPF Dialog Box
To access this dialog box, select the interface you wish to configure (Ethernet,
WAN, VPN) from the device view, select TCP/IP Routing, then click on the
OSPF option button. OSPF must be configured for each interface on
which you want to run OSPF.
v Note: The router will automatically be in the Backbone area, area 0, on
each interface. It is also necessary to add configuration information for an
interface to be assigned to a non-backbone area.
OSPF Dialog Box