Now, it is time to move on to the infamous debug commands that are available to Open Shortest Path First (OSPF) routing protocol. As with the show command, the debug command has many options. Because spreading the net too widely can cause a lot of information to sift through, you want to make the scope of the command as narrow as possible. Unlike other debugging commands, there is not a general debug ip ospf, so you are forced to be a little selective.
Router2>enable
Password:
Router2#debug ip ospf ?
adj OSPF adjacency events
database-timer OSPF database timer
events OSPF events
flood OSPF flooding
hello OSPF hello events
lsa-generation OSPF lsa generation
mpls OSPF MPLS
nsf OSPF non-stop forwarding events
packet OSPF packets
retransmission OSPF retransmission events
spf OSPF spf
tree OSPF database tree
The events option is just about the most general option among the available options. The output that follows shows these options:
The router is sending Hello packets out to the multicast address on one of its network interfaces.
The router is selected as the Designated Router.
The router found a route to 192.168.10.0/24 from one of its neighbors.
Router2>enable
Password:
Router2#debug ip ospf events
OSPF events debugging is on
*Mar 18 02:58:36.069: OSPF: Interface FastEthernet0/0 going Up
*Mar 18 02:58:36.069: OSPF: Send hello to 224.0.0.5 area 0 on FastEthernet0/0 from 192.168.1.240
*Mar 18 02:58:46.069: OSPF: Send hello to 224.0.0.5 area 0 on FastEthernet0/0 from 192.168.1.240exit
*Mar 18 02:58:56.069: OSPF: Send hello to 224.0.0.5 area 0 on FastEthernet0/0 from 192.168.1.240
*Mar 18 02:59:06.069: OSPF: Send hello to 224.0.0.5 area 0 on FastEthernet0/0 from 192.168.1.240
*Mar 18 02:59:16.069: OSPF: end of Wait on interface FastEthernet0/0
*Mar 18 02:59:16.069: OSPF: DR/BDR election on FastEthernet0/0
*Mar 18 02:59:16.069: OSPF: Elect BDR 192.168.5.1
*Mar 18 02:59:16.069: OSPF: Elect DR 192.168.5.1
*Mar 18 02:59:16.069: OSPF: Elect BDR 0.0.0.0
*Mar 18 02:59:16.069: OSPF: Elect DR 192.168.5.1
*Mar 18 02:59:16.069: DR: 192.168.5.1 (Id) BDR: none
*Mar 18 02:59:16.069: OSPF: Send hello to 224.0.0.5 area 0 on FastEthernet0/0 from 192.168.1.240
*Mar 18 03:25:46.084: %OSPF-5-ADJCHG: Process 100, Nbr 192.168.10.1 on FastEthernet0/0 from LOADING to FULL, Loading Done
Router2#no debug ip ospf events
dummies
Source:http://www.dummies.com/how-to/content/debugging-open-shortest-path-first-ospf-routing-pr.html
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