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IGP Troubleshooting Root Causes (Neighbors (Mismatched ASNs (EIGRP only),…
IGP Troubleshooting Root Causes
Interfaces
Routing proto disabled (i.e. incorrect netw command)
Passive interface is set
ACL filtering
Wrong area
Overlapping IP ranges in netw command
Competing netw/area commands
Neighbors
Mismatched ASNs (EIGRP only)
Mismatched timers (OSPF only)
Duplicate RIDs (OSPF only)
Mismatched/misconfigured authentication
Duplicate RIDs (OSPF only)
IPs in diff subnets
Misc
OSPF
OSPF proc shutdown
Int MTU mismatch
Non-backbone not connected to backbone
Mismatched interface network types
EIGRP
Mismatched K values
Split horizon
EIGRP proc shutdown
Pingable same subnet
Interface shutdown
Wrong IP (diff subnets)
LAN switch/physical issue