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Module 3Implementing a Scalable Multiarea
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www.netpro.com.vn 2010 Cisco Systems, Inc. All rights reserved. CCNP1 v1.01-1
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Objectives
Planning Routing Implementations with OSPFas the Scalable Routin Protocol
How OSPF Packet Processes Work Improving Routing Performance in a Complex
Enterprise Network
Configuring and Verifying OSPF Routing on gur ng an er y ng ou e
Summarization
Types
Configuring and Verifying OSPFu en ca on
Module Summary
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Planning RoutingImplementations with OSPF as
h l l R in Pr l
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Link-State Protocols
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Link-State Protocol Data Structures
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OSPF Areas
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Area Terminology and Router Types
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OSPF Adjacencies
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OSPF Calculation
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OSPF Metric
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Building the LSDB
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Link-State Data Structures: LSA Operation
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Defining the More Recent LSA
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LSA Sequence Numbering
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LSA Sequence Numbers and Maximum Age
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Planning for OSPF
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OSPF Implementation Plan
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Documenting OSPF
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Example: Planning for Basic OSPF
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How OSPF Packet Processes Work
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OSPF Functions
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OSPF Packet Header Format
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OSPF Packet Types
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Neighbor Relationship: The Hello
Packet
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OSPF Routing Update Packets
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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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OSPF Neighbor States
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Flooding Changes in Topology
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The debug ip ospf packet Command
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Im rovin Routin Performance ina Complex Enterprise Network
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OSPF Network Types
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Point-to-Point Links
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Multiaccess Broadband Network
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OSPF Adjacency Over Metro Ethernet andEoMPLS
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OSPF Adjacency Over MPLS VPN
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Electing the DR and BDR
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Setting the 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 Topologies
OSPF over NBMA Topology Modes of
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OSPF over NBMA Topology Modes ofOperation
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Nonbroadcast Mode (NBMA Mode)
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Steps to Configure NBMA Mode
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Nonbroadcast Mode Operation
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NBMA Configuration Example
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The show ip ospf neighbor Command
S
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Using Subinterfaces
P i P i S bi f
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Point-to-Point Subinterfaces
P i t t P i t S bi t f E l
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Point-to-Point Subinterfaces Example
M lti i t S bi t f
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Multipoint Subinterfaces
Multipoint Subinterfaces Example
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Multipoint Subinterfaces Example
Point to Point Mode
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Point-to-Point Mode
Point to Point Configuration Example
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Point-to-Point Configuration Example
Point to Point Verification Example
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Point-to-Point Verification Example
Point-to-Multipoint Mode
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Point-to-Multipoint Mode
Point-to-Multipoint Configuration Example
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Point-to-Multipoint Configuration Example
Point-to-Multipoint VerificationE l
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Example
Point-to-Multipoint Nonbroadcast
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Point to Multipoint Nonbroadcast
OSPF over NBMA Topology Summary
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OSPF over NBMA Topology Summary
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Configuring and Verifying OSPF
Initializing Single-Area and Multiarea OSPF
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g g
Planning for OSPF
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g
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Configuring OSPF for Multiple Areas
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g g p
OSPF Router ID
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Configuration of Loopback Interfaces
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Setting OSPF Router ID
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OSPF Router ID Verification
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Steps to Verify Basic OSPF
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Example: The show ip ospf Command
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Example: The show ip ospf interfaceCommand
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Example: The show ip ospf neighborCommand
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Example: The show ip route ospf 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: ASBR Summary LSA
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LSA Type 5: External LSA
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LSA Type 7: NSSA External LSA
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Example of Different LSAs
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OSPF LSDB: Intra-Area Routing
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OSPF LSDB: Intra-Area Routing (Cont.)
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OSPF LSDB: Interarea Routing
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OSPF LSDB: Interarea Routing (Cont.)
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OSPF LSDB: External Routes
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OSPF LSDB: External Routes (Cont.)
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OSPF LSDB: NSSA
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OSPF LSDB: NSSA (Cont.)
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OSPF LSDB: Virtual Link
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OSPF LSDB: Virtual Link (Cont.)
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The show ip route Command
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Calculating Costs for E1 and E2 Routes
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OSPF LSDB Overload Protection
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OSPF Passive Interface
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Design Limitations of OSPF
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Virtual Links as a Solution
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OSPF Virtual Link Configuration
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Virtual Link Verification
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OSPF Cost
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Confi urin and Verif in OSPFRoute Summarization
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Benefits of Route Summarization
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Interarea Route Summarization
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Configure Interarea RouteSummarization
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Configure External RouteSummarization
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Route Summarization Configuration Example atASBR
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Default Routes in OSPF
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Configure OSPF Default Route
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Default Route Configuration Example
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Stub and Totally Stub Area Rules
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OSPF Totally Stubby Areas
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Routing Table in a Stub Area
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Routing Table in a Totally Stubby Area
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NSSA Configuration Example
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Authentication
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Configure Simple Password Authentication forOSPF
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Simple Password Authentication ConfigurationExample
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Configure OSPF MD5 Authentication
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Verifying MD5 Authentication
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Authentication Verification
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Successful Simple Password AuthenticationVerification
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Troubleshooting Simple PasswordAuthentication Problems
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Successful MD5 Authentication Verification
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Troubleshooting MD5 AuthenticationProblems
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Module Summary
Module Summary
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Module Summary (Cont.)
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