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The Open Shortest Path First (OSPF) protocol, defined in RFC 2328, is an Interior Gateway Protocol used to distribute routing information within a single Autonomous System. This paper examines how OSPF works and how it can be used to design and build today's large and complicated networks.
www.cisco.com. Routing Protocol Packets. • Share a common protocol header. • Routing protocol packets are sent with type of service (TOS) of 0. • Five types of OSPF routing protocol packets. Hello - packet type 1. Database description - packet type 2. Link-state request - packet type 3. Link-state update - packet type 4.
The list that follows outlines key features supported in Cisco's OSPF implementation: • Stub areas—Definition of stub areas is supported. • Route redistribution—Routes learned via any IP routing protocol can be redistributed into any other IP routing protocol. At the intradomain level, this means that OSPF can import routes.
Chapter 3 Configuring Open Shortest Path First (OSPF). OSPF Overview. 3-2. Cisco Content Services Switch Routing and Bridging Configuration Guide. OL-4580-01. OSPF Overview. OSPF is a link-state routing protocol that: • Provides network topology discovery within a group of routers and networks called an
q. Stub area—An area that does not have external routing capability, hence type 5 LSAs are not flooded into this area. ASBR cannot be placed inside this area and a virtual link cannot be configured through this area. q. Cisco - OSPF Routing Protocol www.cisco.com/partner/sdm/ci/routing/ospf/CI_OSPF.html (2 of 48)
multiple multi-access networks). The router with the highest priority becomes the DR; second highest becomes the BDR. If there is a tie in priority, whichever router has the highest Router ID will become the DR. To change the priority on an interface: Router(config-if)# ip ospf priority 125. Default priority on Cisco routers is 1.
This chapter describes how to configure Open Shortest Path First (OSPF). For a complete description of the OSPF commands in this chapter, refer to the “OSPF Commands" chapter of the Cisco IOS IP. Command Reference, Volume 2 of 3: Routing Protocols publication. To locate documentation of other commands that
In such a case, the ASBR does send externals into the totally stubby area, and they are available to OSPF speakers within that area. In Cisco's implementation, the external routes can be summarized before injecting them into the totally stubby area. In general, the ASBR should not advertise default into the TSA-NSSA,
IP Routing: OSPF Configuration Guide,. Cisco IOS Release 12.4T. Americas Headquarters. Cisco Systems, Inc. 170 West Tasman Drive. San Jose, CA 95134-1706. USA www.cisco.com. Tel: 408 526-4000. 800 553-NETS (6387). Fax: 408 527-0883
24 May 2002 Understanding basic Open Shortest Path First (OSPF) routing principles not only applies to the CCNP certification but to all Cisco-based certifications. A concrete understanding of how OSPF routing works is fundamental for any small or large network. This chapter focuses on a number of objectives falling
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