Understand Open Shortest Path First (ospf) Design Guide



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ip subnet-zero
command on the router in order to resolve this issue.
RTA#
ip subnet-zero
interface Ethernet2
ip address 192.168.0.10 255.255.255.128
interface Ethernet3
ip address 192.168.0.160 255.255.255.192
interface Ethernet4
ip address 192.168.0.226 255.255.255.192
RTA#show ip route connected
192.168.0.0 is variably subnetted, 3 subnets, 2 masks
C 192.168.0.0 255.255.255.128 is directly connected, Ethernet2
C 192.168.0.128 255.255.255.192 is directly connected, Ethernet3
C 192.168.0.192 255.255.255.192 is directly connected, Ethernet4
Related Information


Cisco IOS® IP Routing: OSPF Command Reference

OSPF and MTU

OSPF neighbors are stuck in exstart and exchange state due to MTU mismatch

OSPF Support Page

OSPF: Frequently Asked Questions

Technical Support & Documentation - Cisco Systems


Document Outline

  • Understand Open Shortest Path First (OSPF) - Design Guide
    • Contents
    • Introduction
    • Background Information
    • Shortest Path First Algorithm
      • OSPF Cost
      • Shortest Path Tree
    • Areas and Border Routers
    • Link-State Packets
    • Enable OSPF on the Router
    • OSPF Authentication
      • Simple Password Authentication
      • Message Digest Authentication
    • The Backbone and Area 0
    • Virtual Links
      • Areas Not Physically Connected to Area 0
      • the Backbone
    • Neighbors
    • Adjacencies
      • DR Election
      • Build the Adjacency
      • Adjacencies on Point-to-Point Interfaces
      • Adjacencies on Non-Broadcast Multi-Access (NBMA) Networks
    • Avoid DRs and neighbor Command on NBMA
    • OSPF and Route Summarization
      • Inter-Area Route Summarization
      • External Route Summarization
    • Stub Areas
    • Redistribute Routes into OSPF
    • Redistribute OSPF into Other Protocols
      • Use of a Valid Metric
      • VLSM
      • Mutual Redistribution
    • Inject Defaults into OSPF
    • OSPF Design Tips
      • Number of Routers per Area
      • Number of Neighbors
      • Number of Areas per ABR
      • Full Mesh vs. Partial Mesh
      • Memory Issues
    • Summary
    • Appendix A: Link-State Database Synchronization
      • Link-State Advertisements
      • OSPF Database Example
    • Appendix B: OSPF and IP Multicast Address
    • Appendix C: Variable Length Subnet Masks (VLSM)
    • Related Information

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