Avaya Configuring IP Services Bedienungsanleitung Seite 196

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Configuring IP Services
7-2
303528-A Rev 00
OSPF Concepts and Terminology
OSPF is a link-state protocol. A router running a link-state protocol periodically
tests the status of the physical connection to each of its neighbor routers and sends
this information to its other neighbors. A link-state protocol does not require each
router to send its entire routing table to its neighbors. Instead, each OSPF router
floods only link-state change information throughout the autonomous system (or
area, if the AS is divided into areas). This process is referred to as the
synchronization of the routers’ topological databases.
With the link information, each router builds a shortest-path tree with itself as the
root of the tree. It then can identify the shortest path from itself to each destination
and build its routing table.
This section covers the following topics:
Topic Page
OSPF Addresses and Variable-Length Masks
7-3
OSPF Neighbors 7-3
Neighbor Adjacencies 7-4
Designated Routers 7-4
OSPF Areas 7-5
OSPF Router Types 7-6
AS External Routes 7-6
OSPF Implementation Notes 7-7
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