December 2005 © Foundry Networks, Inc. 20 - 1
Chapter 20
Configuring OSPF
This chapter describes how to configure OSPF on Foundry Layer 3 Switches using the CLI.
This chapter contains the following information:
For complete syntax information for the CLI commands shown in this chapter, see the Foundry Switch and Router
Command Line Interface Reference.
NOTE: If you need to increase the capacity of the IP route table, see “Displaying and Modifying System
Parameter Default Settings” on page 4-8.
Overview of OSPF
OSPF is a link-state routing protocol. The protocol uses link-state advertisements (LSA) to update neighboring
routers regarding its interfaces and information on those interfaces. The router floods these LSAs to all
neighboring routers to update them regarding the interfaces. Each router maintains an identical database that
describes its area topology to help a router determine the shortest path between it and any neighboring router.
Foundry Layer 3 Switches support the following types of LSAs, which are described in RFC 1583:
• Router link
• Network link
• Summary link
• Autonomous system (AS) summary link
• AS external link
Table 20.1: Chapter Contents
Description See Page
Overview of OSPF 20-1
Configuring OSPF 20-8
Displaying OSPF information 20-36
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