Root: WRM Database > Information Technology > Certifications > CCNA > IOS Commands > "debug ip ospf adj" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > IOS Commands > "debug ip ospf hello" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > IOS Commands > "show interfaces" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > IOS Commands > "show ip ospf" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > IOS Commands > "show ip ospf interface" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > IOS Commands > "show ip ospf interface brief" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > IOS Commands > "debug ip ospf adj" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > IOS Commands > "debug ip ospf hello" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > IOS Commands > "show interfaces" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > IOS Commands > "show ip ospf" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > IOS Commands > "show ip ospf interface" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > IOS Commands > "show ip ospf interface brief" > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Neighbor Requirements > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Neighbor Requirements > Same Subnet > Best Command(s) to Isolate the Problem > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Neighbor Requirements > Pass Neighbor Authentication > Best Command(s) to Isolate the Problem > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Neighbor Requirements > Hello and Hold/Dead Timers Must Match > Best Command(s) to Isolate the Problem > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Neighbor Requirements > Same Area > Best Command(s) to Isolate the Problem > OSPF Neighbor Requirements?
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Neighbor Requirements > RIDs Must Be Unique > Best Command(s) to Isolate the Problem > OSPF Neighbor Requirements?



OSPF Neighbor Requirements


OSPF Neighbor Requirements and the Best "show/debug" Commands:

Requirement

Best Command(s) to Isolate the Problem

Must be in the same subnet

"show interfaces", "debug ip ospf hello"

Must pass any neighbor authentication

"debug ip ospf adj"

Hello and hold/dead timers must match

"show ip ospf interface", "debug ip ospf hello"

Must be in the same area

"debug ip ospf adj", "show ip ospf interface brief"

Router IDs must be unique

"show ip ospf"







References

Odom, Wendell (2008) CCNA ICND2 Official Exam Certification Guide, Second Edition. Indianapolis: Cisco Press.