9-2 log
adjacency
-changes detail
Syntax Description:
This command has no arguments.
Purpose:
To enable the logging of changes in an OSPF neighbor's status. If the UNIX syslog facility is enabled, messages can be sent to a UNIX host running the syslog daemon. If you are not using the UNIX syslog facility, then the status change messages are stored in the router's internal buffer. This command is an
excellent
tool for troubleshooting OSPF.
Initial Cisco IOS Software Release:
11.2. The
detail
keyword was added in 12.1.
Configuration Example 1: Enabling OSPF Neighbor Status-Change Logging to the Console
To enable the display of OSPF neighbor status-change events on the console, use the following configuration.
router ospf 1
log-adjacency-changes
Verification
When the state of an OSPF neighbor changes, the events are displayed on the console. For example, if you execute the command
clear ip ospf process
on an OSPF neighbor, the following output should be displayed.
rtrA#
clear ip ospf process
Reset ALL OSPF processes? [no]: y
rtrA#
00:52:14: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from FULL to DOW
N, Neighbor Down: Interface down or detached
00:52:23: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from LOADING to
FULL, Loading Done
If the keyword
detail
is used, then complete information regarding the neighbor status will be logged.
router ospf 1
log-adjacency-changes detail
rtrA#
clear ip ospf process
Reset ALL OSPF processes? [no]:
yes
rtrA#
00:50:12: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from FULL to DOW
N, Neighbor Down: Interface down or detached
00:50:13: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from DOWN to INI
T, Received Hello
00:50:13: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from INIT to 2WA
Y, 2-Way Received
00:50:13: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from 2WAY to EXS
TART, AdjOK?
00:50:13: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from EXSTART to
EXCHANGE, Negotiation Done
00:50:13: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from EXCHANGE to
LOADING, Exchange Done
00:50:13: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from LOADING to
FULL, Loading Done
Configuration Example 2: Enabling OSPF Neighbor Status-Change Logging to Memory
Use the following configuration to enable the logging of OSPF neighbor status-change events to memory.
logging buffered 4096 debugging
!
router ospf 1
log-adjacency-changes detail
The parameters
4096
and
debugging
are default values and are supplied by the router when you use the command
logging buffered.
The default values vary by platform.
Verification
The
show logging
command displays the status of buffered logging. If logging is enabled, then the contents of the buffer will be displayed.
rtrA#
show logging
Syslog logging: enabled (0 messages dropped, 0 messages rate-limited, 0 flushes,
0 overruns)
Console logging: level debugging, 67 messages logged
Monitor logging: level debugging, 0 messages logged
Buffer logging: level debugging, 8 messages logged
Logging Exception size (4096 bytes)
Trap logging: level informational, 71 message lines logged
Log Buffer (4096 bytes):
00:56:38: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from FULL to DOW
N, Neighbor Down: Interface down or detached
00:56:43: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from DOWN to INI
T, Received Hello
00:56:43: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from INIT to 2WA
Y, 2-Way Received
00:56:43: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from 2WAY to EXS
TART, AdjOK?
00:56:43: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from EXSTART to
EXCHANGE, Negotiation Done
00:56:43: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from EXCHANGE to
LOADING, Exchange Done
00:56:43: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Ethernet0/0 from LOADING to
FULL, Loading Done
Troubleshooting
-
Step 1.
Verify that the OSPF neighbors have established a relationship.
-
Step 2.
Verify that buffered logging is enabled using the
show logging
command.
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