Appendix Q: Troubleshooting IPv4 Routing Protocols
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ip hello-interval eigrp 100 5
Interface subcommand that sets the EIGRP Hello interval to 5 seconds for EIGRP process 100.
ip hold-time eigrp 100 15
Interface subcommand that sets the EIGRP hold time to 15 seconds for EIGRP process 100.
ip ospf hello-interval 10
Interface subcommand that sets the OSPF Hello interval to 10 seconds.
ip ospf dead-interval 40
Interface subcommand that sets the OSPF dead timer to 40 seconds.
passive-interface GigabitEthernet0/5
Router subcommand (for both OSPF and EIGRP) that stops sending Hellos and neighbor discovery on interface GigabitEthernet0/5.
show ip protocols
Shows routing protocol parameters and current timer values, including an effective copy of the network commands and a list of passive interfaces.
show ip eigrp interfaces
Lists the interfaces on which EIGRP is enabled for each EIGRP process, except passive interfaces.
show ip route eigrp
Lists only EIGRP-learned routes from the routing table.
show ip eigrp neighbors
Lists EIGRP neighbors and their current status.
show ip ospf interface brief
Lists the interfaces on which OSPF is enabled (based on the network commands), including passive interfaces.
show ip ospf interface GigabitEthernet0/5
Lists detailed OSPF settings for GigabitEthernet0/5, including Hello and Dead timers and OSPF area.
show ip route ospf
Lists routes in the routing table learned by OSPF.
show ip ospf neighbor
Lists OSPF neighbors and their current status per interface.
show ip ospf
Lists messages about the OSPF process itself, including the OSPF Router ID in the first line.
show interfaces
Lists configuration, state, and counter information for each interface.
show interfaces description
Lists one line of output per interface with brief status information.
debug eigrp packets
Generates log messages for EIGRP packets transmitted and received by the router.
debug ip ospf adj
Generates log messages for OSPF adjacency events (neighbor up/down).
debug ip ospf events
Generates log messages for each action taken by OSPF, including receipt of LSAs.
debug ip ospf packet
Generates log messages describing the contents of all OSPF packets.
debug ip ospf hello
Generates log messages describing OSPF Hellos and Hello failures.
undebug all
EXEC command that disables all current debug operations.