07 Apr 2011 - Lab-Rat
Here are some notes to remember and commands for debugging EIGRP:
EIGRP and Frame - Split horizon is ON BY DEFAULT on frame links.
show ip eigrp neighbor
- shows neighbor status. Look for 0 under Q count in good relationship.
debug eigrp packet hello
- sending hellos?
debug ip eigrp
- shows routes blocked by distribute lists
debug ip routing or debug ip routing 1 (for just the target route)
access-list 1 permit 192.168.1.0 0.0.0.255
access-list 1 deny any
- shows route being constantly added
show ip eigrp interface
- shows peers, round trip time, pending routes
show interface s0/0/0
- shows the delay and bandwidth set on the interface. Remember to add them for a cumulative route value.
show ip protocol
- will show the K values for EIGRP
ping 224.0.0.10
- check eigrp listeners
clear ip eigrp neighbors
- Will reset neighbor relationships and kick off DUAL
show ip route x.x.x.x
- Shows the routing table with details on x.x.x.x
show ip route eigrp
- Shows the EIGRP routes in the routing table
show ip eigrp topology x.x.x.x
- Shows the eigrp database
show ip eigrp event
- troubleshooting flopping route. Look for timer update 0:00:00, find neighbor doing update.
show ip eigrp topology active
- hunt stuck in active on each neighbor
debug eigrp packet
- will show authentication failures
Additional Reading:
Troubleshooting EIGRP
EIGRP Commands
EIGRP
Troubleshooting IP Routing Protocols
Also check out general debugging under Debug RIP.