debug ip ospf packet

I have collected debugging outputs and tried to descript what it means and what evens it shows is operating on the network since 2 years ago. I think as an expert level network troubleshooter, you need to find out where the problem is, but also tell your client why the network is operating abnormally. Some engineers, I am not talking about the common networkers, what I am talking about including a large amount of CCIE which means the expert level engineers, they totally understand nothing about how to use debug command on routers and switches, or how to use this information to enhance their troubleshooting skills. I am thinking unsafe to run my business upon networks that established by these "experts". I hope they read my post and be more professional to their work.

We'll talk about the OSPF packets first.

To display information about each Open Shortest Path First (OSPF) packet received, use the debug ip ospf packet command in privileged EXEC mode.



Examples:



The following is sample output from the debug ip ospf packet command:

Router# debug ip ospf packet
OSPF: rcv. v:2 t:1 l:48 rid:200.0.0.117
aid:0.0.0.0 chk:6AB2 aut:0 auk:

The debug ip ospf packet command produces one set of information for each packet received. The output varies slightly depending on which authentication is used. The following is sample output from the debug ip ospf packet command when message digest algorithm 5 (MD5) authentications is used.

Router# debug ip ospf packet
OSPF: rcv. v:2 t:1 l:48 rid:200.0.0.116
aid:0.0.0.0 chk:0 aut:2 keyid:1 seq:0x0

Below describes the significant fields shown in the display.