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File Routing Protocols and Concepts: Chapter 11

Type: OSPF packet type: Hello (Type 1), DBD (Type 2), LS Request (Type 3), LS Update (Type 4), LS ACK (Type 5). Router ID: ID of the originating router. Area ID: Area from which the packet originated. Network Mask: Subnet mask associated with the sending interface. Hello Interval: Number of seconds between the sending router’s Hellos. Router Priority: Used in DR/BDR election (discussed later). Designated Router (DR): Router ID of the DR, if any. Backup Designated Router (BDR): Router ID of the BDR, if any. List of Neighbors: Lists the OSPF Router ID of the neighboring router(s). | Chapter 11 OSPF quangkien@gmail.com For further information This presentation is an overview of what is covered in the curriculum/book. For further explanation and details, please read the chapter/curriculum. Book: Routing Protocols and Concepts By Rick Graziani and Allan Johnson ISBN: 1-58713-206-0 ISBN-13: 978-58713-206-3 Topics Introduction to OSPF Background of OSPF OSPF Message Encapsulation OSPF Packet Types Hello Protocol OSPF LSUs OSPF Algorithm Administrative Distance Authentication Basic OSPF Configuration Lab Topology The router ospf command The network command OSPF Router ID Verifying OSPF Examining the Routing Table The OSPF Metric OSPF Metric Modifying the Cost of the Link OSPF and Multiaccess Networks Challenges in Multiaccess Networks DR/BDR Election Process OSPF Interface Priority More OSPF Configuration Redistributing an OSPF Default Route Fine-tuning OSPF Introduction to OSPF Background of OSPF OSPF Message Encapsulation OSPF Packet Types Hello Protocol OSPF | Chapter 11 OSPF quangkien@gmail.com For further information This presentation is an overview of what is covered in the curriculum/book. For further explanation and details, please read the chapter/curriculum. Book: Routing Protocols and Concepts By Rick Graziani and Allan Johnson ISBN: 1-58713-206-0 ISBN-13: 978-58713-206-3 Topics Introduction to OSPF Background of OSPF OSPF Message Encapsulation OSPF Packet Types Hello Protocol OSPF LSUs OSPF Algorithm Administrative Distance Authentication Basic OSPF Configuration Lab Topology The router ospf command The network command OSPF Router ID Verifying OSPF Examining the Routing Table The OSPF Metric OSPF Metric Modifying the Cost of the Link OSPF and Multiaccess Networks Challenges in Multiaccess Networks DR/BDR Election Process OSPF Interface Priority More OSPF Configuration Redistributing an OSPF Default Route Fine-tuning OSPF Introduction to OSPF Background of OSPF OSPF Message Encapsulation OSPF Packet Types Hello Protocol OSPF LSUs OSPF Algorithm Administrative Distance Authentication Introduction to OSPF OSPF is: Classless Link-state routing protocol Uses the concept of areas for scalability RFC 2328 defines the OSPF metric as an arbitrary value called cost. Cisco IOS software uses bandwidth to calculate the OSPF cost metric. Background of OSPF 1987 - Initial development by IETF OSPF Working Group. 1989 - OSPFv1 was published in RFC 1131. 1991 - OSPFv2 was introduced in RFC 1247 by John Moy. ISO was working IS-IS IETF chose OSPF as its recommended IGP (interior gateway protocol). In 1998 - OSPFv2 specification was updated in RFC 2328 and is the current RFC for OSPF. OSPF Message Encapsulation This data field can include one of five OSPF packet types. In the IP packet header: Protocol field is set to 89 (OSPF) Destination address is typically set to one of two multicast addresses: 224.0.0.5 224.0.0.6 If the OSPF packet is encapsulated in an Ethernet frame, the destination MAC address is also a .