Configuring OSPF 03

7/31/2019 Configuring OSPF 03

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Configuring OSPF

BSCI Module 3


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Link-State Protocols


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Link-State Data Structures


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Link-State Routing Protocols


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Link-State Data Structure: Network Hierarchy


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OSPF Areas


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Area Terminology


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OSPF Adjacencies


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Forming OSPF Adjacencies


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OSPF Calculation


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SPF Calculation


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Link-State Data Structures: LSA Operation


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OSPF Packet Types


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OSPF Packet Header Format


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Neighborship: The Hello Packet


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Establishing Bidirectional Communication


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Discovering The Network Routes


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Adding the Link-State Entries


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Maintaining Routing Information


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LSA Sequence Numbering


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LSA Sequence Numbers and Maximum Age


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Debug ip ospf packet


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Configuring Basic OSPF


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Configuring OSPF on Internal Routers of a Single Area


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Configuring OSPF for Multiple Areas


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OSPF Router ID


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Loopback Interfaces


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OSPF router-id Command


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OSPF Router-ID Verification


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Verifying OSPF Operation


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Verifying OSPF Operation (Cont.)


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Example: The show ip ospf interface Command


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Example: The show ip ospf neighbor Command


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OSPF Network Types


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Point-to-Point Links


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Multiaccess Broadcast Network


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Electing The DR and BDR


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Setting Priority for DR Election


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NBMA Topology


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DR Election in NBMA Topology


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Frame Relay Topology


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OSPF over NBMA Topology Modes of Operation


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Selecting The OSPF Network Type for NBMA Network


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Nonbroadcast Mode (NBMA Mode)


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Using the neighbor Command


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Neighbor Command Example


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The show ip ospf neighbor Command


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Point-to-Multipoint Mode


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Point-to-Multipoint Configuration


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Point-to-Multipoint Example


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Point-to-Multipoint Nonbroadcast


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Using SubInterfaces


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Point-to-Point SubInterfaces


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Point-to-Point SubInterface Example


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Multipoint Subinterfaces


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Multipoint Subinterface Example


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OSPF over NBMA Topology Summary


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Creation of Adjacencies for Point-to-Point Mode


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Creation of Adjacencies for Broadcast Mode


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Issue with Maintaining a Large OSPF Network


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The Solution: OSPF Hierarchical Routing


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Types of OSPF Routers


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Defining Virtual Links


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Configuring Virtual Links


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OSPF Virtual Link Configuration Example


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The show ip ospf virtual-links Command


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LSA Types


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LSA Type 1: Router LSA


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LSA Type 2: Network LSA


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LSA Type 3: Summary LSA


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LSA Type 4: Summary LSA


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LSA Type 5: External LSA


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Interpreting the OSPF Database


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Interpreting the Routing Table: Types of Routes


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Calculating Costs for E1 and E2 Routes


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The show ip route Command


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OSPF LSDB Overload Protection


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Changing the Cost Metric


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Benefits of Route Summarization


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Using Route Summarization


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Configuring Route Summarization


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Route Summarization Configuration Example at ABR


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Default Route in OSPF


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Configuring OSPF Default Routes


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Default Route Configuration Example


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Types of Areas


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Stub and Totally Stub Area Rules


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Using Stub Areas


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Stub Area Configuration


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OSPF Stub Area Configuration Example


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Using Totally Stubby Areas


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Totally Stubby Configuration


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Totally Stubby Configuration Example


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Routing Table in a Standard Area


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Routing Table in a Stub Area


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Routing Table in a Stub Area with Summarization


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Routing Table in a Totally Stubby Area


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Not-So-Stubby Areas


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NSSA Configuration

SS C f


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Example: NSSA Configuration

NSSA T t ll St bb C fi ti


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NSSA Totally Stubby Configuration

Sh C d f St b d NSSA


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Show Command for Stub and NSSA

OSPF A th ti ti T


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OSPF Authentication Types

C fi i OSPF Si l P d A th ti ti


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Configuring OSPF Simple Password Authentication

Example Simple Password Authentication Configuration


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Example Simple Password Authentication Configuration

R2 Configuration for Simple Password Authentication


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R2 Configuration for Simple Password Authentication

Verifying Simple Password Authentication


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Verifying Simple Password Authentication

Configuring OSPF MD5 Authentication


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Configuring OSPF MD5 Authentication

Example MD5 Authentication Configuration


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Example MD5 Authentication Configuration

R2 Configuration for MD5 Authentication


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R2 Configuration for MD5 Authentication

Verifying MD5 Authentication


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Verifying MD5 Authentication

Troubleshooting Simple Password Authentication


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Troubleshooting Simple Password Authentication

Troubleshooting Simple Password Authentication Problems


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Troubleshooting Simple Password Authentication Problems

Troubleshooting MD5 Authentication


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Troubleshooting MD5 Authentication

Troubleshooting MD5 Authentication Problems


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Troubleshooting MD5 Authentication Problems


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Documents

Configuring OSPF 03