Reference Guide  5. Debug Commands 
Version 7.2  75  Mediant MSBR 
5.21  debug ospf 
This command debugs Open Shortest Path First (OSPF) routing protocol for Internet Protocol 
(IP) networks. 
Syntax 
# debug ospf  
 
Command  Description 
Displays OSPF event information.  
ism {events|status|timers} 
Debugs the OSPF Interface State Machine 
(ISM Event Information, ISM Status Information 
and ISM TImer Information). 
lsa 
{flooding|generate|install| 
refresh} 
Debugs the OSPF Link State Advertisement 
(LSA Flooding, LSA Generation, LSA 
Install/Delete and LSA Refresh). 
nsm {events|status|timers} 
Debugs the OSPF Neighbor State Machine 
(NSM Event Information, NSM Status 
Information and NSM Timer Information). 
nssa 
Debugs the OSPF NSSA (Not-So-Stubby 
Area), a non-proprietary extension of the 
existing stub area feature that allows external 
routes to be injected in a limited fashion into the 
stub area.  
See http://www.ietf.org/rfc/rfc1587.txt for more 
information. 
packet {all|dd|hello|ls-
ack|ls-request|ls-update} 
{detail|recv|send} 
Debugs the OSPF packets (detailed 
information, packets received or packets sent). 
Packets can be all, database (dd), hello, link 
state acknowledgement, link state request or 
link state update). 
zebra 
{interface|redistribute} 
Debugs the OSPF Zebra routing software 
which provides TCP/IP based routing services 
with support from routing protocol OSPF. 
Command Mode 
Privileged User 
Note 
This command is applicable only to data-router functionality. 
Example 
This example displays OSPF event information: 
# debug ospf event