Open Shortest Path First (Ospfv2 And Ospfv3); Protocol Overview - Dell C9000 Series Networking Configuration Manual

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Open Shortest Path First (OSPFv2

This chapter describes how to configure and use Open Shortest Path First (OSPFv2 for IPv4) and OSPF version

3 (OSPF for IPv6).

The fundamental mechanisms of OSPF (flooding, DR election, area support, SPF calculations, and

so on) are the same between OSPFv2 and OSPFv3. This chapter identifies and clarifies the differences

between the two versions of OSPF. Except where identified, the information in this chapter applies to

both protocol versions.

OSPF protocol standards are listed in the

OSPF Implementation

Configuration Information

Sample Configurations for OSPFv2

Configuration Task List for OSPFv3 (OSPF for IPv6)

Protocol Overview

OSPF routing is a link-state routing protocol that calls for the sending of link-state advertisements (LSAs) to all

other routers within the same autonomous system (AS) areas.

Information on attached interfaces, metrics used, and other variables is included in OSPF LSAs. As OSPF

routers accumulate link-state information, they use the shortest path first (SPF) algorithm to calculate the

shortest path to each node.

OSPF routers initially exchange HELLO messages to set up adjacencies with neighbor routers. The HELLO

process is used to establish adjacencies between routers of the AS. It is not required that every router within

the AS areas establish adjacencies. If two routers on the same subnet agree to become neighbors through the

HELLO process, they begin to exchange network topology information in the form of LSAs.

In OSPFv2 neighbors on broadcast and NBMA links are identified by their interface addresses, while neighbors

on other types of links are identified by RID.

Standards Compliance

Open Shortest Path First (OSPFv2 and OSPFv3)